Renault Laguna II - Phase 1 - Electronics - Idle problems and possible fix - Motorised Throttle Valve - Page 3 - Renault Forums :: Independent Renault forum

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post #11 of 48 (permalink) Old 14th March 2006
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It sounds like they want to replace the throttle body as the butterfly actuator is faulty.I suspect this would come as one unit.
I'd try the cleaning option first,if not then try and source a second hand one,although I'm not sure that it wouldn't need reprogramming after replacement??
I'm not sure wether a dirty throttle body would throw up 7 codes though!!The ECU is obviously getting the wrong messages from something in the system.Did they give you the codes and what they were for?

I'd rather push my Alfa than drive a BMW....
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post #12 of 48 (permalink) Old 14th March 2006 Thread Starter
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Thanks for the reply Lagdti.

I saw the list of codes, and i probably could get hold of them, they just have a couple of young lads on the service area and i think if I was polite enough they would let me have a copy.

I seem to remember one of the throttle body codes (there were differing ones) mentioned the valve you refer to.

I've put some enquiries out regarding a 2nd hand unit.

I believe the unit resets itself upon fitting or refitting, but the settings should be checked.

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post #13 of 48 (permalink) Old 24th March 2006 Thread Starter
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Have had my Laguna in for its service at my local (trusted!) garage, asked them if they could take the throttle body off and clean it, he said no problem as they have done this a few times and they also have the kit to re-program it.

They did this, but they said once the car was upto temp the idle became erratic again, they also said the throttle body was not dirty.

So outcome is, they recommended a new throttle body (this is what the Renault dealer said, nice to have a second opionion), which I agreed to and they are fitting it on Monday, with a bit of luck that will be the end of it.

So I've had it serviced, throttle body cleaned / replaced and also they are going to put it through its MOT .

All i can say is I'm glad its pay day on Monday.

I have a Jaguar X type diesel for the weekend, and I am already missing the Laguna (believe it or not).


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post #14 of 48 (permalink) Old 28th March 2006 Thread Starter
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Update - last one hopefully.

I have had my Throttle body replaced (202) and it looks like it has corrected the erratic idle I had.

So as well as the above I've had the car serviced and mot'd (passed , rear axle bushes will also be ok for a while)

All told 465, which might seem alot but the guy did a lot of work, and i know its been done right, and I'm sure at a dealer I would have added another 200-300.

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post #15 of 48 (permalink) Old 6th April 2006
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Excellent posting Han - glad the new part sorted the problemo out -

I agree that ( in terms of fixing your car at the roadside ) the old cable system was a lot cheap and easier to sort out but the new system is designed for a reason..

I will try to explain a little

The drive-by-electronic wire ( rather than old fashioned mechanical cable ) accelerator linkage drives a motorised ( or actuated ) throttle valve.

The conventional accelerator cable controlling the throttle valve mechanically is replaced by a sensor which measures the position of the driver's foot on the accelerator pedal in real time.

This information is received by the engine management computer which subsequently positions the intake throttle valve via a small electric motor.

This perhaps more complicated design has distinct advantages over the mech wire. It is more precise and allows the computer properly to control the engine's torque output at each instant by directly controlling the amount of air admitted.

All the petrol engines had to comply with the latest exhaust emission requirements of Euro 3 (Euro 2000) complete with an OBD system which checked the proper performance of the emission control system over time.

The engines also comply with the IF 2005 emission standard for those countries which demand it, such as Germany.

Unfortuantely this is the future for all cars as our tiny planet becomes choked by petrol heads like you & I mate.

Anyhow enjoyed your post and if you get the renault part numbers from your receipt I would be very grateful in case I ever suffer a similar fate.

Regards L20

electronics , fix , idle , laguna , motorised , phase , problems , renault , throttle , valve

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