peugeot 306 revs on its own!!!!

imadiscoman · Post by **imadiscoman** » 24 Mar 2006, 19:36

hi can anyone help
my 306 decided all of a sudden to rev at 3000 instead of the normal 1000
all by itself but then goes to normal and fluctuates up and down again
we had a diagnostic done by independent garage free as he a friend and was told it is the steppo motor??
so we changed this and it is doing exactly the same as before and after talking to peugeot they say the steppo motor only controls air flow and stops car from stalling
can anybody give us a cure??
many thanks

Pheonix · Post by **Pheonix** » 26 Mar 2006, 02:16

I've heard alot of pugs do this...most people just put up with it unless its actually causing you a problem?

imadiscoman · Post by **imadiscoman** » 26 Mar 2006, 14:04

hi thanks for reply joe
unfortunatley it is causing a problem as it goes on its own!!
im sure eventually it would end up burning the brakes out as its hard to stop when its in this mode

PowerLee · Post by **PowerLee** » 26 Mar 2006, 14:17

There will be a fault somewhere with the system.

Are you 100% sure you dont have an airleak on the induction side? That would make the revs go through the roof?

Has the MAP sensor tested out ok?

Is the coolant temp sensor ok?

Is the steeper motor air bypass hole spotlessly clean? Was the O ring seal replaced?

wheeler · Post by **wheeler** » 26 Mar 2006, 23:36

PowerLee wrote: Is the steeper motor air bypass hole spotlessly clean?

i'd also agree that this has to be spotless,remove the stepper motor then get a rag soaked in WD40 wrapped round a small screwdriver & get right in about the part of the throttle body it sits in,you will see loads of black gunge coming out on the rag,clean the stepper motor again cause the black build up will have went onto the new stepper motor.

imadiscoman · Post by **imadiscoman** » 28 Mar 2006, 19:30

hi guys been to peugeot today for the pugs second diagnostic
they say it is the coil pack gone down and has upset the ecu too!
apparantly you cant use them off another car(from scrappy) you have to buy new they have quoted £700+ to replace
help!!!!!!!!!!!!!!!!!!!!!
ive seen ecu s on ebay with same number(sl96-9)
does anyone know if this would work i would think at the outside i would need it reprogramming but at least it wouldnt cost all that and i could buy new coilpack

PowerLee · Post by **PowerLee** » 28 Mar 2006, 19:43

Hmmmm coil pack faliure, Dont often hear about that fault

You can use a second hand ECU but make sure its UNLOCKED first before its removed form its original car.

Or try this company for a recon ECU with a warranty

http://www.bba-reman.com/catalogue/Prod ... tegory=157

imadiscoman · Post by **imadiscoman** » 28 Mar 2006, 23:10

hi

thanks for info on recon ecu
how do you unlock ecu on donor car??..
thanks

wheeler · Post by **wheeler** » 29 Mar 2006, 18:39

You need to start the engine,switch it off & disconect the ECU within 30 seconds.

PowerLee · Post by **PowerLee** » 30 Mar 2006, 21:26

I was told it was unplug the ECU with the engine running to stop the immobiliser locking the ECU up again.

fastandfurryous · Post by **fastandfurryous** » 30 Mar 2006, 22:17

at a guess, I'd say both were correct, as the immobiliser doesn't engage the instant the engine is stopped... maybe about 30 seconds later?

imadiscoman · Post by **imadiscoman** » 01 Apr 2006, 17:14

ok sounds like i should see if someone can repair my old one as cant see a scrapyard round here having one that runs for me to do that
thanks guys youve all been a great help and are a credit to the forum

wheeler · Post by **wheeler** » 01 Apr 2006, 19:17

PowerLee wrote:I was told it was unplug the ECU with the engine running to stop the immobiliser locking the ECU up again.

I take it you mean the transponder control unit ? unplugging the engine ECU with the engine running would give a very high chance of Fuc***g it big time.
if you do then yes,unplugging the transponder control unit would also do the exact same thing,reason being if the two units cant comunicate with each other then they cant lock.i mentiond the ECU disconection method due to the fact that it was being removed anyway.
The imobiliser doesen arm till 30 seconds after the door is opened that why you only have 30 seconds to remove it.

stevieb · Post by **stevieb** » 02 Apr 2006, 02:15

I believe the immobiliser has a 30 second delay. If you should stall the car, the green light on the immobiliser stays on for quite a while (not timed it), so you can obviously get started again and on your way. Having to type in your code again would be a downright problem on roads in this day and age.

I found this out when trying to start away in third on a hill....

Hey, it worked in second....