Accelerator doesn't work. Revs bounce up and down on idle.

[James28]

When the car is idling in neutral, the revs bounce from 1000rpm to 2/2500rpm repeatedly. So it's going "vroom, back down, vroom, back down, vroom, back down" by itself.
Touching the accelerator does nothing. Doesn't increase revs or appear to work at all.

I've swapped the pedal assemply (electronic throttle) still did it.
Also cleaned the throttle body to no avail.

It's intermittent. Sometimes car/accelerator will work fine, other times it'll be as described from start up. Or do it suddenly whilst driving along.

Any ideas?

 

[ben_barron]

This happened to me and was a melted cable in the engine bay going to throttle body..purple I think it was..just a suggestion to check

 

[danward]

This happened to me for a short while until I noticed that I hadn't pushed the plug all the way in on the pedal - you really have to give it a good plugging!

 

[James28]

Can't see any botched wires.
I took apart the potentiometer, and seems to have cleared some faults. Still getting idle control valve fault though.
​potentiometer makes a weird noise like a hard drive spinning lol.

Thing is its intermittent. Most of the time since putting it back together its been fine.

 

[Gaz2480]

Mine did the same at one point and turned out it was the battery that was weak. Put a new one on and it's been fine since.

 

[James28]

I'll get my multimeter on it

 

[James28]

Battery is fine. Tried with a diff one.

 

[Emma.]

Mine did this when the throttle body was dying

 

[James28]

I think it must be emma. Trouble is a second hand one for it from renparts is 100 quid lol. And I don't 100 percent know it'll fix it.

 

[Emma.]

I bought one off here for £30

edit, there must be someone close to you that would be willing to try theirs in yours to see If its the problem for beer tokens for a 10 minute job.

 

[James28]

Trouble is its a 1.2 8v , not my 182, and has an electronic throttle body, most 8v's were cable!

 

[Kat@Renparts]

the dreaded electronic throttle body on the 1.2 8v!! over £300 new from renault, and only fitted from 2001 -2003 so quite hard to get hold of! Went back to manual throttle body after that as it was such a terrible throttle body! Think we have a car coming on wednesday that should have one on it.

 

[James28]

I was the one who rung you the other day enquiring about a replacement lol

 

[James28]

Well, I sourced a replacement throttle body, and surprise surprise, it still doesn't work.

So I've checked:
Replaced accelerator pedal.
Replaced Throttle body.
Checked loom for any visible wiring damage.

None of which have worked. It's driving me insane.
Thing is its intermittent. Sometimes it'll appear to work absolutely fine. Then randomly start doing the rev bouncing again. I'm begging for ideas lol.

 

[James28]

Tried different battery
Checked connectors on top of ECU.

Still has the issue. Please help CS, lol.

 

[danward]

Maybe the connection for plugging the accelerator in is corroded or is failing in that area?

 

[Dan519]

loom damage somewhere. probably going to be a relay that powers the TB, which has an output from the ECU to trigger the relay. I'd be lookng there first

 

[James28]

Where is the relay? Is it under the bonnet under that stupid plastic cover next to the battery?

 

[DTM Cars Ltd]

Loom damage common ecu bracket wears through at back of inlet remove the metal casing it ll be shorting across.

 

[MicKPM]

Loom damage common ecu bracket wears through at back of inlet remove the metal casing it ll be shorting across.

If it's the 8v D7F then the ECU is in a different place and so unlikely to be this. If though it turns out to be the 16v D4F then it is possible alomg with damaged/corroded ECU pins, bad earths, other loom issues.

I don't even bother fixong these looms anymore I just replace them with new ones... bloody hornets nest like things these are for problems where you fix one issue and cause another three.

The bouncing you are seeing is as a result of some item not being detected by the ecu (open circuit) be it the TB or the Pedal tracks. Take it to someone that knows what they're doing as I personally don't think swapping parts will fix it, this is wiring at fault.

 

[James28]

Definitely the 8v D7F . Yea it's definitely a wiring problem like you say. The circuit is short circuiting somewhere (according to one of the error codes)

Where I have no idea. No obvious exposed wires or loom damage.

I did read about this metal bracket, but pretty sure this engine don't have that. Ecu is in same place as 182's .

I just wanted to be certain so eliminated a few possibilities by swapping a few parts.

 

[Hpd]

I know this thread is YEARS old but I have this exact same car (8v) and the exact same problem! If anyone could help please 🙏🏻🙏🏻🙏🏻

 

[Krarl]

I know this thread is YEARS old but I have this exact same car (8v) and the exact same problem! If anyone could help please 🙏🏻🙏🏻🙏🏻

What year as pre-2001 have cable throttle

 

[Hpd]

What year as pre-2001 have cable throttle

it’s a 51 plate

 

[Krarl]

it’s a 51 plate

Take a pic of the engine bay mate

Not sure if they still used a cable convert early PH1 before moving to fly by wire

 

[Hpd]

Okay will do it now

 

[Hpd]

Hope this helps

 

[Krarl]

Yeah fly by wire

Clean the throttle body and give the inlet a clean as they're common to have breathing issues on them anyway

 

[Hpd]

Thanks for help. I think it’s an electronic throttle body (if that’s such a thing) so not sure how I go about cleaning it?

 

[Krarl]

Thanks for help. I think it’s an electronic throttle body (if that’s such a thing) so not sure how I go about cleaning it?

Just take it off mate and clean behind the butterfly so it moves smoothly

 

[Hpd]

This could be the problem

 

[Krarl]

Yeah that's 100% your problem hahahahah

Check the breather on the inlet as they can block up and oil can pool in the inlet mate

 

[Hpd]

Niceone I’ll going to have a go at this and will let you know! What a mess lol

 

[Hpd]

Refitted and the car works. Hopefully that’s the end of this problem!