Does the accelator pedal return to its normal position when revving up?
Does this happen irregardles of whether the AC is on or off?

 

Thanks for the reply. Yes, the accelator do return to its normal position and it has no effect on the engine revs whether its depressed or not, the engine speed varies between 2000 and 4000 revs. AC on or off has no effect on the problem. Once the problem has surfaced the engine needs to be switched off, sometimes for a minute or so but other times for longer preiods, the longer the car is left switched off longer it will take for the problem to reappear. The problem used to occur once a month or so but now it is quite regular. The weather or temperature has no affect on the problem as it was occuring in winter and in summer alike.

If you require any further info. please let me know.

Thanks again

 

laguna 2001 throttle body problems

Hi

My car has been like this now for a number of months now , it was originally suspected to be an engine management fault .

It is now thought throtte body may reqiire repalcement

did you get your car fixed would be grateful for update

 

Hi,

My car is still experiencing the same problem, tje replacement of throttle body did not make any difference and I was told my Renault mechanic that he does not know anybody who has ever come accross a faulty throttle body. as I mentioned earlier the garage replaced throttle body, spark plugs and the injection ecu. After they replaced the ecu , the car was running ok for about 4 months but then it started playing up again and now the fault is occuring after every trip when I stop and then restart the journey. I did get in touch with Renault Uk who were not of much help, I have not taken the car to Renault garage again as I don't think they got any real idea about the cause of the problem, they just keep on replacing parts in the hope of fixing it but its me who is paying for it.

So my friend I am just living with the fault for the time being.
If your car gets fixed please let me know as to what was the cause of the problem.

Thanks and Good luck

 

Hi Kuldip

thanks for reply , my mechanic has started to look at the potentiometers which deliver the information electronically from the throttle peddle to the throttle body . In my laguna
there in no cable but an electronic signal . If this signal is faulty the car will act up intermittently as you described

hope this is of help and good luck

chris

 

Hi

Had similar issues with my R Reg 2.0 RXE Scenic. It turned out to be the temp sensor. when the garage read my ecu they changed the crank sensor aswell, i suspect though it was a spurious fault on the crank sensor as they either work or they dont.
Temp sensors are thermistors therefore as the temperature builds, their internal resistance reduces. as they fail the internal resistance of the thermistor will (generaly) increase thus sending an inaccurate reading to the managment system. This can be read with a calibrated multimeter (OHMS) and the deflection can be compared to the factory readings which should be listed in the relevent haynes manual. Thermistors are temp dependent so if the performance changes with engine temperature it is a good indication that the component is breaking down.
Hope this helps mate.

 

Hi - i have a renault laguna 2.0 Tourer - and have experienced v.similar problem. Warning light comes on, car loses power - have to restart. runs ok then but keeps telling me ther'es a fault and to contatc my renault dealer 'for all the good that's worth'. Car has had \injection computer replaced, TDT sensor replaces, Manifold Pressure sensor replace, and now they say it needs a new fuel pressure regulator!!! where will it all stop. Have contacte Renault UK - and they say if thats waht the diagnostic machen says then that's all they can do. I can't believe they can't think beyond a machine to figure out a problem?!

 

laguna

Hi,

I was told excactly the same that the diagnostic test are showing throttle body fault but it did not cure the fault I honestly don't know what to do as you Renault Uk were not of much help either and I was told that they have no record of such a fault with Laguna.

Please let me know if your car gets fixed, what was the cause.

K S OBHI

 

Hi Chris,

Thanks for the info. Please let me know if your car problem is fixed after the replacement of the potentiometres, then perhaps let me know where this mechanic is so that I can get it fixed of him if he is in my area (Cheshire).

Thanks again.

Kuldip

 

Hi Kuldip

Have you got your car sorted yet? I've got a simmilar problem with my 2002 1.6 laguna but feel even more helpless than most of you guys as my car is in St Lucia (Caribbean) wher we have no renault dealers and only 2 other renaults on the entire island! I've done the throttle body replacement thing which did not work but while I am awaiting a ¤¤¤¤ion I've notice by quickly disconnecting then reconecting the + battery pole it appears to clear the error allowing me to continue my journey without the usual wait to allow the engine to cool down....considering installing a "flick" switch from the battery to inside the car ;-)

Will try cleaning the ECU conectors and let you all know if that make a diffrence

 

Hi Kuldip

The problem was traced to a blocked / dirty valve in the throttle body , they seen to clog up if the petrol gets low
on a regular basis .

throttle body stripped and serviced , since then no probs ( touch wood )

I am in edinburgh area ( scotland )

Hope you get your problem fixed ,

Chris

 

Hi

Did you strip and service the throttle body or have to pay.?

Got the same problem and seems from others comments that the throttle sensors not causing the problem leaving the finger pointing at the throttle body.

Hope to hear from you soon.

 

Hi Chris,

Thanks for the info. You lucky guy, I wish mine was fixed. When I first took the car to the Renault garage they didn't clean the throttle body but replaced it but it didn't make any difference as the problem surfaced again within a month or so. I always keep my tank half full of fuel so that rules that out I think The problem is now getting worse and I have to take the car again to the Renault garage and see what happenes.

Anyway many thanks for the info. and good luck.

Take care.

Regards,

Kuldip

 

limp home mode

Hi Kuldip

Welcome to the world of conflicting and differing diagnosis coming from renault dealers.My problem is similar in nature( limp mode) and the solutions suggested from independent and renault dealer include throttle body replacement, injection ecu replacement and pedal replacement.

After reading many posts on this forum
of all of the above parts replaced and still no luck i have been coping for about 2 months with the problem occuring within 10 minutes of every journey untill about 3days ago.

What i have been doing is shaking the wire harness of the E.C.U on the side and under the battery and also removing the fuse cover and shaking /tapping the relays.

I have done this on 4 of my last 5 trips with the problem occuring only on the trip i did not do it (third trip).

Can't say it's a sure fix yet , maybe someone will say if there's a problem in that

A little reason to smile.

 

Laguna 2 injecion fault probs, throttle body,Injec ecu



ok guys here goes this i my story , ive posted about this on forum a few times ,this problem has been driving me barmy for months , where the car throws up a fuel injection faut, runs rought at idle , no accelerator, and revs between 2000 to 5000 revs al same probs as u all report , wait a bit and it resets after varing time

i went to dealership to cut a long story short and at daft cost had throttle body striped n cleaned, wiring checked, new plugs then did it again , so had new throttle body wiring checked again told all was well, behold it did it again

so i went to an independant place had full wiring loom opened an checked found broken wire fixed that took off main ECU from under battery tray ( no good place to put it ) an guess what all plugs n pins on ECU corroded to the hilt
so they are currently in the process as i post trying to fix it

also all the fault codes it throws up are not really faults the ecu ges confused and reads signals wrong ive had them all
to list a few- flywheel sensor, pollution monitor ( but thats coz its not running efficiently) and a few more

Top n bottom is when the car drives its ok so, if all else fails its a new ECU quoted £334 for part then requires reprog to car so god knows and am poss thinking if they cannot fix the corroded plugs a new wiring loom

Gutted :steam: :steam: :steam: :steam: :steam:

If anyone can add to this please feel free

 

This sounds very familiar.....

We have had a lot of Lag 2 1.8 petrol owners complaining of throttle problems,and originally if the throttle body was replaced the problem was remedied.Then the problem would come back,and they generally had to have a new ECU.....but no explaination was ever given as to why.....I think you have just told us!.

Depending on the state of the connections,they might be savable,but if they are too bad,then the plug will need to be replaced.....and guess what,the plug isn't available seperately and you will need a new loom!.This can be very expensive.....

 

Repaired at last

well what can i say....................

After months of barmy antics , visits to the dealers , lots of cash spent at lieing dealers who just want to rip you off because the clip test tells them to replace parts that are not really at fault or broken

I HAVE SUCCESS

My car is now running like a dream as it should without a murmer just perfect,

And it was all down to corroded dirty pins on the main ECU and wiring loom sockets at the ECU its a simple as that

I paid for a new throttle body that was not required 3 visits to the dealers and was told they had checked the wiring completely twice.............. utter crap otherwise surely that would have been picked up

All the dealers do is replace parts the clip test or ECU tells them i had a list well long of various things but, it was all false, there was nothing ever wrong with the parts at all just that the bad connections had caused the resistive values to go ¤¤¤¤ a hoop.

Now im told by a reliable source that when they are first put together at factory they spray a anti corrosive gel onto the plugs and contacts to prevent corrosion or water ingress, after a few years this gel sets rock hard and then looses it properites and hey presto u get corrosion and duff contacts on the plugs n pins at the ECU under the battery tray :steam: :steam:

It has taken my independant garage who have lots of diagnostic equipment a week to go thru my car with a fine toothcombe wiring loom everything and come out with the answers its geat.......... Why could the DEALERS not do this is just not right

Bear this in mind if i had have gone back to the renault dealers they wanted to change the coils, the fuel injection ECU, then the main ECU, thats what they told me would need to be changed utter carbage, unbeleiveable

Im just so chuffed its fixed its been a long 6 months
Of course the other outcome would have been that if the plugs and pins had been to badly corroded then a new loom and poss ECU might have been required but i carnt help but think if it had been picked up on my very first visit to the renault SPECIALIST Dealers then all this might have been prevented after all it was with tem 4 days and they throughly chcked all the wiring :steam: :steam: did you Really


Hope this helps anybody else who has gone thru this hell We dont have open cheque books RENAULT to replace everything your clip test says sometimes that lies too

 

Throttle problem fixed

well what can i say....................

After months of barmy antics , visits to the dealers , lots of cash spent at lieing dealers who just want to rip you off because the clip test tells them to replace parts that are not really at fault or broken

I HAVE SUCCESS

My car is now running like a dream as it should without a murmer just perfect,

And it was all down to corroded dirty pins on the main ECU and wiring loom sockets at the ECU its a simple as that

I paid for a new throttle body that was not required 3 visits to the dealers and was told they had checked the wiring completely twice.............. utter crap otherwise surely that would have been picked up

All the dealers do is replace parts the clip test or ECU tells them i had a list well long of various things but, it was all false, there was nothing ever wrong with the parts at all just that the bad connections had caused the resistive values to go ¤¤¤¤ a hoop.

Now im told by a reliable source that when they are first put together at factory they spray a anti corrosive gel onto the plugs and contacts to prevent corrosion or water ingress, after a few years this gel sets rock hard and then looses it properites and hey presto u get corrosion and duff contacts on the plugs n pins at the ECU under the battery tray :steam: :steam:

It has taken my independant garage who have lots of diagnostic equipment a week to go thru my car with a fine toothcombe wiring loom everything and come out with the answers its geat.......... Why could the DEALERS not do this is just not right

Bear this in mind if i had have gone back to the renault dealers they wanted to change the coils, the fuel injection ECU, then the main ECU, thats what they told me would need to be changed utter carbage, unbeleiveable

Im just so chuffed its fixed its been a long 6 months
Of course the other outcome would have been that if the plugs and pins had been to badly corroded then a new loom and poss ECU might have been required but i carnt help but think if it had been picked up on my very first visit to the renault SPECIALIST Dealers then all this might have been prevented after all it was with tem 4 days and they throughly chcked all the wiring :steam: :steam: did you Really


Hope this helps anybody else who has gone thru this hell We dont have open cheque books RENAULT to replace everything your clip test says sometimes that lies too

At last there is light at the end of the tunnel, for months i have been plagued by this problem.....I can now go to my mechanic and point him in the right direction cheers

 

for all you laguna 2 owners who have 1.8 16v petrol models mines an 02 plate and have encountered the ellicit Fuel Injection Fault, car goes into limp mode, no accelerator, then resets after half hour ,

I have a possible solution fix

Before you do anything else get the wiring loom checked out and especially the plugs and pins at the main ECU under the battery tray

If they are corroded or look dodgy clean and soak them with a suitable solution that can burn it off i dont know what kind but im sure you top mechaics can say that, all i know is it worked on my car after much cost at dealers and replaceing parts i never needed because the fault reoccured

A clip test or ECU read will throw up many daft faults but thats due to the connections being faulty

Its a bit of a job to do as an amature i beleive, but its saved my car

Now to try and recoupe some cost form my dealers as they should have picked it up in the first place and ive had parts replaced i didnt need and the problem remaind wish me luck

 

could you explain what the 'wiring loom' is and where abouts it is please? i've looked in the haynes manual but can't see a reference to it. will i see it when taking out the battery and inspecting the ecu pins? what are you supposed to do with the 'wiring loom'? could you also recommend a suitable cleaning solution for the ecu pins?
Many thanks for your post. we have a 2ltr turbo laguna initiale

 

Thank-you very,very much for sharing your experiences with us,this should help out a number of members.

I've merged your threads,moved them to the Laguna knowledge base and 'stuck them' so they always remain at the top of the first page.

Excellent info,thanks once again.

 

Many many thanks to trevstamf to share your vary valuable experience. I owned this Laguna II 1.6 16V Expression 2002since 4 month ago, recently had exactly the same problem. My car is runing on LPG but this problem can come whether it is on petrol or LPG. It used to happen once a week, after driving for a while, stop to do some shopping, when come back, the "electrical fault" light went on and run into limp mode. From time to time it also happens during driving after a short break. Last week it started happening everyday. Sometimes a restart will solve the problem sometimes not.

After searching in the forum I also suspected the throttle body can be faulty. Last month after a long trip to France I had the car fully serviced and new igination coils, new sparks fitted. The guy in the garage told me the throttle body is working fine.

As an electronics engineer, my instinct told me it could most be a contacting problem somewhere. But I do not have any clue where to start with. Thanks to trevstamf's post. The day before yesterday I open my car for the first time by myself. I removed the battery, the sensor box and cleaned everything, reconnected doggy wires (I have many extra wire and some extra boxes for the LPG part). But I have not touched the ECU part. As far as I can see, the ECU is sealed in an metal box. It is covered by a piece of metal that I can not remove. I am thinking to buy a Haynes manual before proceed. I will try to make some pictures next time.

My Laguna was running quite ok for the last two day, but it is a bit too early to be happy.

 

That's great news!

Hi trevstamf!

Thanks so much for sharing your experience! I have the same problem and Renault ######### have already replaced the throttle body!(263 pounds)

As I have Parts and Labor cover from AA I only had to pay 25 pounds for this. But I had to pay 43 pounds for their (mis)diagnosis and another 57 pounds for the hire car while they spent an eternity keeping my car at their garage!

It is amazing how clueless these dealers are!! If I hadn't checked the Internet they would have replaced every part they can think of without fixing this problem!

Now I will print this thread out and show it to them(Renault #########) and ask them to fix this!

I feel I should warn AA about this problem as well because they can pass this information on to the garages next time when they see this in a break down situation so their insurgence department doesn't have to pay stupid dealers who just replace expensive parts trying to solve this problem!

I am sure my problem is the same and I have finally found the solution! Thank you so much!

 

Does this fix works for everyone?

I just wanted to check if Kuldip who started this thread has managed to fix this as well. If not then that would imply there may be more than one problem with the same symptoms.

Can you please give us all an update no how things are Kuldip? Does the fix described by trevstamf work for you too?

 

Hi,

Unfortunately my car is not fixed, I have the wires under the battery checked and have removed the plug from the throttlebody it looked quite clean. I have taken the car to another mechanic who again say that the diagnosic box is showing throttlebody problem. Whenever I take the car for repair they reset the error code and the car runs fine for few days.

I live in Crewe Cheshire, does anyone knows a mechanic who is capable of fixing this problem and is located reasonble distance from me.

Kuldip

 

Thanks Kuldip,
At first I thought I have found a solution. But now after seeing your reply I am not so sure. It seems the car goes into 'limp mode'(with throttle control lost and revving around 2000 - 3000 by itself - just to take you home) is a common symptom for a multitude of problems. God knows which one we have.

But the problem you and I are having (and that of mzhao) have one more interesting thing in common - The fact that we have to drive a bit, then stop for a short while and then start to trigger this problem. It is not clear if trevstamf or any of the others in this thread have had this particular pattern. Could trevstamf please let us know if you have noticed this kind of behavior in your case? Anyone else who have seen this?

I am beginning to think may be buying a Renault Laguna is not such a smart decision after all!

But I am not going to give up on this car without a fight! I will let everyone know what the dealer says on Thursday.

 

Thanks Samsam,

Apart from Renault dealer my car has been to two other mechanics and has cost me another £70. The mechanics are keen to replace the trottlebody as their diagnostic tool says that throttlebody has a problem. Each time the error code is cleared ie reinitialised the car is ok for a Week and again starts showing the problem.

The other thing is that when it goes into fault mode if I switch the engine off straight away it does goes back to normal for few more miles. The longer I keep it driving in the fault mode the longer it takes for the car to go back to normal when I switch the engine off and on again.

So my friend I am ****** off with the car, pardon my blanks.

Kuldip

 

While my car was with renault dealer for the second time, I told them how to recreate the problem. I told them they have to drive for an hour and then leave it for half an hour or so.

Later they said they successfully re created the problem after trying 3 times. They said it is the throttle position sensor this time. Good bye to another 100 pounds (although I can claim 75 pounds from AA)

So what about last time when then replaced the throttle body? Well, they keep saying it was a different problem last time and that was really necessary. I claimed that from AA as well.

I really don't know if they have identified the problem. I did give them a print out of a forum page where the 'Hardening gel and ECU pin corrosion issue was mentioned.I mentioned it to them and they said they will check it as well.

Yesterday I got the car back. To be honest I am really not sure if this is fixed. I can tell only after another month I think.

If that happens again I won't take it to Renault again. I will have to try an independent specialist around here. I will continue to post my story with the hope that it will help others.

I think the title of this thread should be changed, the work 'Fixed' should be removed as it is still not fixed for Kuldip who started the Thread. And what is described as 'Throttle problem' is the limp mode all renault cars go into when they have a problem.
So it is only the common symptom of a number of problems.

By the way, I have noticed that every time I mentioned the dealers name my post gets censored in this forum. The name gets replaced by '#####'! I wonder why? I have seen a notice somewhere that says offensive language will be censored but why cut off a dealers name? Can someone explain what is going on? Maybe there is a bug in the software that thinks 'Maidenhead' is a bad word?

 

you should also see in the rules of the forum that you are not allowed to name and shame dealers, due to possible legal action against the forum...when a moderator sees the thread they will edit out the name of the dealer.

 

Thanks for explaining that rule about naming dealers Astrix!

To see if my car is really fixed, I will have to take my car out for an hour long drive , stop it and start again after about an hour.

I think I will do it a few times this week. If it is still not fixed, I should know it soon. I will come back with more news later.