[Blackpool]

hi kuildip.

did you ever get the problem fixed iv got the same prob only when you start driving.

Hi Lofty,
I have had the same problem with my Laguna recently. Fortunate for me my mate owns a garage and looks after all my cars. I called him out and he plugged the diagnostics into the car, the plug is behind your ashtray. I watched as he tested my ecu for faults and it appeared I had 8 different faults showing up. At the press of a button all the faults was gone and the car is running like new again.
He explained it to me like an ordinary pc that gets clitches and needs to be rebooted, the ecu can do the same from time to time and needs a reboot.
If you take it to be looked at, always ask if they have the up to date software loaded as renault are constantly updating.
Good luck.

 

[worstcasescenario]

Hi Lofty,
I have had the same problem with my Laguna recently. Fortunate for me my mate owns a garage and looks after all my cars. I called him out and he plugged the diagnostics into the car, the plug is behind your ashtray. I watched as he tested my ecu for faults and it appeared I had 8 different faults showing up. At the press of a button all the faults was gone and the car is running like new again.
He explained it to me like an ordinary pc that gets clitches and needs to be rebooted, the ecu can do the same from time to time and needs a reboot.
If you take it to be looked at, always ask if they have the up to date software loaded as renault are constantly updating.
Good luck.

Does the ecu on a Renault not reset itself when you disconnect the battery for at least ten minutes and reconnect it? It does on my Transit and most of the other cars I've worked on, but you need to let idle for a while on restart and then a drive a few miles nice and steady. On newer models Mercedes in particular you can not do this.

 

[Gunbunny]

I had the same problem with engine "pulsing" - it stopped when I disconnected the battery and cleaned the ECU connections so maybe it was the ecu resetting itself - I'll have a chat with my local Indymech now so thanks for that input, much appreciated.

 

[benwiggins]

my friend has the same problem with his 2002 1.8 laggy. Garages cant find a fault with it. But so far he has put it down to droppin the key card. Must be something with the immobilser. If he drops the key card, goes on a journey, stops the engine and restarts it while staying near the car with the key, the revs go up and down. If he walks away some distance from the car with the key it works fine, meaning the immoboliser must reset. Let me know what you think as my friend is still curious as to what exactly it could be.

 

[benetton]

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.

 

[Aphelion]

Hopefully may have a fix and method of testing
now done three of these all with the same fault.

Not throttle body, harness, ecu or position switch

As with the previous posts the fault is in the ecu wiring. The faults I have found are with the computer earth in the top plug of the ecu
Remove battery box and ecu
Testing check continuity from the throttle body two light orange wires and four grey to the centre plug on the ecu to do this you will need to remove the plug wire tie bands on the plug backs, if no continuity repair other wise follow on

remove plug backs pull computer to front of car so you can reconect battery.
start car and run up to engine is warm by doing this you open the throttle body remove battery earth to clear memory in ecu and reconect battery

put key in to ignition and you should now be able to here the throttle body. the sound should be a low buzzing noise as the ecu holds the body open due to engine being warm.
as you now have access to the ecu plugs if you move them from side to side you will here the throttle body motor moving in and out and you have now found the fault
the faults I have found relate to the top plug on the ecu the two black earth wires for the computer.

to clean there is no easy way to clean the conection what I do is remove the rubber seal around the plug to allow more movement in the plug using either electomex or WD40 liberally spray conectors and keep working form side to side unpluging and repluging, on occasions I
have had to clean and waggle the plugs for about 15 min until you dont get the trottle motor moving in and out and hey presto you have cured your bad connections to the computer and dont get the throttle body error so to recap the injection light and throtle body error appears to flag up due to poor computer earth conections

hope this will help a lot of disguntled Laguna owners

Aphelion RTE

 

[fiksss]

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

Mine were like that when my catalyc convetrer roted all inside, changed and was fine...

 

[Camjon]

I've just experienced the same problem. The garage replaced the throttle body and said it was fixed but it wasn't.

The problem is that there is a problem with the ECU recognising and registering the new part (or whatever the technical term for this is) the garage perservered and after 3 goes of reprogramming the ECU it finally worked and now the problem has totally gone (touch wood).

 

[claytyn jones]

I have Renault laguna 1.8 16v 2002. It has an on going problem whereby after travelling about 8 to 10 miles if I stop and start the journey again, the car starts ok but after few minutes the electrical fault light comes on and the engine starts to rev betwwen 2000 and 4000 revs. and the accelator has no control over the engine speed. The car has been in the garage and they have replaced throttle body, spark plugs and the injector E.C.U. After the ecu was replaced car was ok for couple of months and now the problem have again surfaced and is getting worse. Initially problem was occuring one a month or so but now it is occuring regularly whenever and I make start stop journeys. The distance of the journey I thionk is not important but whenever the car is stopped and restarted within half an or so the problem occurs . If the car is left standing for few hours and then started it will take longer for the problem to reoccur.
I shall be greately obliged if anyone can suggest a solution.
Many thanks in advance.

Kuildip Obhi

this is the
fuel sensor not regalater claytyn

 

[Hoffy]

I also have the same fault, had the cat con changed, but diagnostic still pointed to the throttle body. But now it making me stall when i stop due it irratic revs, and the engine revs at 2000, and takes about 30 mins to reset. My question is....i've found a 2nd hand throttle body, with the same part numbers, so can i just fit it and drive, or does it need to be programmed into the ECU by a garage/renault service engineer.

Regards
Paul

 

[studz]

I have a similar problem where the engine revs on its own and I can be driving and take my foot off the accelerator and the car will still be doing the same speed as it was when I had my foot on the accelerator . The local garage have said its a switch gone . Just wondering if anyone else has come across this problem before and if so how easy is it to change the switch as I really dont fancy paying the £200 plus Ive been quoted so far by the garage .

 

[KevJ1]

Hi everyone, 1st post so please go easy!

Was there ever any photos of the ECU wiring being accessed and cleaned? Renault have quoted £1700 for ECU, Throttle Body and wiring loom and although I'm a very bad mechanic, I'd quite like to give this trick a go before the car gets scrapped!

All help appreciated.

 

[DeeBeeS]

I have just experienced the same problem with my 1.6 Tourer. Fortunately I was able to get the services of an ex Renault mechanic who had a diagnostic computer and it read that there was an electrical fault in the throttle body. He then disconnected the plug at the throttle body end of the wiring, gave it a good clean sprayed it with WD40 and then checked the connections were in the right position, reconnected and did a test drive and the problem appears to have gone.
I have not had the problem return so far so I am keeping my fingers crossed. If it has been fixed it has only cost me €30.

 

[LloydPatten]

I have a Renault Laguna 2 2002 F5R 2.0 IDE
It was working fine until one day whilst I was driving the dashboard lit up like a christmas tree and then the engine shut off. I waited for about ten minutes and then restarted. I managed to get home, approx 9 miles and had to restart about two or three times.

AA diagnostics = fuel problem. Changed my plugs (Bosch @ Halfords)

I have changed the fuel pump/filter unit that sits in the fuel tank, the complete fuel rail + injectors + fuel pressure regulator.
Same problem but now the car can start from cold, I can leave it idleing for about 15 minutes reving occassionally....no problem...then there is a moment when the engine is hot and the SERV + management + a few others and it shuts off. At that point I can restart but the vehicle goes for about 50 yards and shuts off.
I have searched the forum but I have not been able to find a similar topic, pulling my hair out, can someone please help!

 

[LloydPatten]

After doing some extensive research onthis forum I have removed and cleaned up the ECU and contacts, removed throttle body and cleaned, removed TDC sensor and cleaned. Replaced spark plugs with Renault plugs. When purchasing the plugs inormed Renault of the cars problems and was informed that it was an ongoing problem and that I should talk to Renault customer care and state that I knew there is an ongoing issue with this. The service department checked that I did not need a ECU update and told me that the car probably needed a 'clean up'. I will put it all back tomorrow and fire it up.

 

[Guest]

After doing some extensive research onthis forum I have removed and cleaned up the ECU and contacts, removed throttle body and cleaned, removed TDC sensor and cleaned. Replaced spark plugs with Renault plugs. When purchasing the plugs inormed Renault of the cars problems and was informed that it was an ongoing problem and that I should talk to Renault customer care and state that I knew there is an ongoing issue with this. The service department checked that I did not need a ECU update and told me that the car probably needed a 'clean up'. I will put it all back tomorrow and fire it up.

I don't belive the problem suffered by the IDE engines are the same as that of the 1.8 F4P the orginal subject of this thread. IIRC the IDE engines are notorious for being trouble some the fuel regulator being a common problem.

 

[LloydPatten]

Put it all back, fired up car, started first time. Left idleing for 10 mins, noticed orange engine light on dash board, went for a spin....great, after about 20 mins stopped to talk to someone...started up again....BANG! It all lights up again...limp mode home!

 

[LloydPatten]

:dSuccess at last!
After heartfelt prayer...solution!
Took out ECU....again, checked all connections etc.
Car running better but still same problem.
Was just about to check out six cables from throttle body to ECU for continuity when a friend suggested start engine and disconnect throtle body cable.
Did that and engine became lumpy and eventually shut down.
Diagnosis...cable is OK.
Took out throttle body...again!
Took out four star screws and gently prised the lid off trying not to break anything...these are 250 all up fitted from Renault.
A flat piece of the inner black lid breaks away which needs to be put back into place on re assembly.
Inside the cap had a greasy film with lots of carbon deposit, sprayed out and thoroughly cleaned.
Next there are four contacts that look like metalic eyelashes that make contact with with the inside of the cover, carefully cover over the rest of the throttle body and spray clean without getting any contact cleaner on the electrics, then slightly bend them upwards so that when you replace the cover it makes good contact. The black piece needs to be put back exactly in position, clean off rubber seal, replace lid carefully and hold firmly in position whilst screwing in four star screws.
Replace throttle body.
So, after replacing the pump in fuel tank, complete fuel rail including the fuel regulator...all bought from Renault Specialist for 300, a new set of spark plugs, cleaning of ALL sensors, spray cleaning all engine wireing connections, dismantleing the throttle body, and feverent prayer my Laguna now runs like a rocket, it is the best that I have had this car going...and the bonus...I know how to service my car...properly.

 

[healycamilla]

Hi there i have the same problem with my lagunaII 1.6 and am interested in trying to fix the problem, where is the ECU located and how difficult is it to remove etc?

 

[roadrunner20]

Hi mate i had the same problem with my laguna , where it was reving forever what a nightmare .
Your best is to replace your throttle body , pedel and get a hole is ecu kit .
When replacing the ecu make sure it its been resetted and the software updated