Peugeot 206 1.4 Auto idling issue?

[millerman]

Pete, just had a look at my Wifes 206 and its slightly different, her's ia a 99 model, all the vac lines are tight , none have movement as you describe fella.
Not sure how they go about adjusting the IAC or even if it can be adjusted!

 

[jetex]

Typical dealer bull.... on a par with " There was a loose connection".

 

[DIYheadache]

Thanks millerman, thought this might be unusual.

re - dealer bull

I thought that too and said to him I wasn't aware you could "adjust" a stepper motor. He replyed they adjusted a setting in the software, not the stepper motor and the technician needs to start car from cold to test. I read this as "we are leaving the battery disconnected overnight to reset/clear the ECU","We hope this sorts the problem out".

I then replyed they should do a proper road test with the engine hot, as this was when the fault happened.

I'll update tomorrow, should get a phone call back.

Thanks

Pete

 

[millerman]

Pete, keep on at 'em fella, dont be fobbed off.

 

[DIYheadache]

Well, no phone call! I called them about 30 mins before they closed. Said they have been carrying out road tests all day and the car appears to be fine but they have asked to keep the car tomorrow so they can do more testing to be sure.

More bull?

Collecting Thursday. Will be doing a longish journey, if it happens again then what? Do I take it back to Peugeot? Take it to an independant or try to solve it myself?

Pete

 

[jetex]

Keep on at the Dealer. An indepenent diagnostic specialist may solve the problem but he will charge you, and you've already paid once. If the dealer can't solve it with all their resources, I very much doubt that you will solve it yourself.

 

[DIYheadache]

Well, car back from garage now.

Work carried out

Cleaned throttle body
Cleaned and refitted body earth strap (advised a replacement soon due to slight damage).
Reset ECU and run from cold - warm
full road test

Hope these have fixed the problem.

Thanks again.

Peter

 

[Burnerman]

I hope things are sorted, Peter.....
Cleaning throttle body - a good move.....basically its a variable resistor connected to an air induction flap that tells the ECU how much fuel to provide.
Body earth strap? Hmmm good earths are required, admittedly but they are clutching at straws with that one.
Resetting the ECu is common practice - its set back to 'basic' settings, and when you drive off the ECU 'learns' your particular driving style and adjusts things accordingly (thats the theory, anyway).
Best of luck and keep us informed mate.
John

 

[millerman]

Pete, i must agree with John on the subject of earth strap, if it was suspect and contributing to the problem why did they not replace it? Remove the earth strap and the engine wont run, replace it and the engine will run, cant see this has anything to do with you're problem.
Hope it all fixed now though.

 

[DIYheadache]

Seems to be improved but ....

Idle speed is about 700-750 ish (should it be this low?).

Slow to repond to a change in engine load (like before but it does not hunt up and down).

This leads me to believe there is still a vacuum leak or the MAP sensor is not responding quick enough to changes.

But saying all this it didn't oscilate erratically like before.

 

[millerman]

This idle to me seems a little low for an auto given that the revs will drop when D is selected.
Anyway, give it a week and see if there are any changes, as a last resort you may have to move on to another garage for a second opinion.
Have a word with these guys Pete, they may well be of use to you.
http://www.peugeotcentral.co.uk/forum-6.html

 

[DIYheadache]

Sorry, it idles at 700-750 when in Drive. About 800-850 ish when in Park.

Thanks for the link. Seems mine is a common problem!

 

[DIYheadache]

I don't believe it!!!! It's happened again.

Went round a friends, about ten miles away, no problems. About three hours later we got back in. Ran into some traffic on the way back, as we stopped in traffic the engine starts to idle up & down again. Once we get going steady, the problem goes.

I don't know what to do, I don't even think Peugeot have got a clue. I ran a few tests when we got back. A few questions.

Should the RPM change when you pump the brake or put the aircon on? It doesn't jump up and down but does take a few seconds to settle down.

My thought is there must be a vacuum leak somewhere?

 

[Burnerman]

Pumping the brake pedal gives a momentary drop in manifold pressure as the servo diaphragm moves......maybe a sensor in the manifold could be detecting this? A long shot, I know.....
Putting the air con on often gives a slight initial drop in rpm due to the compressor clutch engaging, and the ecu should speed things up to compensate.
I do suspect a throttle body problem here, but thats because I can't think of anything else!
John

 

[Burnerman]

You know, an air leak between the cylinder head and inlet manifold could cause this - I had a similar issue years ago with a 205 auto, 1600cc.
Worth checking the bolts are tight if you can get in there.
John