Had the same problem with my zx volcane 2.0i. I think it's the same engine as the XSI. I haven't had any repeats since changing the stepper motor,
Humpy
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Is someone going to explain what a stepper motor is?
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When you want to use an electric motor to control the position of something, an ordinary motor is not much use because it's hard to know what position the 'something' is at, unless you configure it as a servo with a position feedback potentiometer. This and the associated control circuitry are expensive and the potentiometer in particular is unreliable.
The alternative is to use a stepper motor. A stepper motor has at least four wires going into it and by applying current to the appropriate wires you make the motor advance by a certain number of degrees. The control circuitry is digital and, given a known starting point, it's fairly easy to feed in the required number of pulses to achieve the desired position. The 'known position' would normally be determined at startup by some sort of limit switch, either mechanical or optical.
Other places you are likely to find stepper motors are in inkjet printers and scanners, where precise mechanical positioning is vital.
Any offers or a more lucid explanation?
wowbagger
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"Steppa motor" An electronic acctuator which can move forwards or reverse whith degrees of acuracy!
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Thanks for you reply megnus, do you have any idea of how much it's going to cost to get it fixed?
Over the weekend I took my car to a motor mechanic, I explained to him that I reckon it's stalling because of a faulty stepper motor. According to him my engine doesn't have a stepper motor but an idle speed controller, which does the same job as a stepper motor.
He showed me exactly where it was and explained that if he were to pull out the plug connected to this controller the car should stall. He went on to pull the plug whilst the car was started but the car didn't stall. So it definitely looks like a faulty stepper motor/idle speed controller.
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Difficult to say. Like I said, they'd hideously overcharged me for the accelerator cable, and so the bill that I paid in the end wasn't really comparable to what it should have beem, as they didn't charge labour for the stepper motor. I'll dig around in the odl receipts and see what I can find.
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From a dealer, stepper motors are about £100.
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Last week my friend Mark and I replaced his faulty stepper motor on his K reg 1.8 306 XT. He picked one up from a scrap yard for only £20 (he'd been quoted £75 excl VAT for a new one).
On his 1.8 (I don't know if it would be the same for the 2 litre) the stepper motor is located at the front of the engine on the throtle assembly along the air inlet pipe. It's a small cylindrical thing (about the same length as a matchbox), with a 4 wire connector on the end. It's only attached by 2 screws with star-style ends and only took us about 5-10 minutes to change.
I'd never heard of one before last week!
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Kevham, by the sounds of your description it sounds exactly the same as mine. I was wondering is it really worth buying a second hand one?
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It would seem so, his 306 is idling fine now. What we did have to do after fitting the stepper motor is disconnect the battery for a few seconds to re-set the ECU.
He reports that it?s not just idling better but pulling with greater smoothness from lower revs.
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i had a similer problem with my car, but the throttle was jamming on at about 3-3500rpm, it turned out to be a heat sensor in the engine, not the stepper motor. it also reset, but when turning the car off.
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I've had the exact same problem. It was in the garage (templegate bristol) for a few days, they couldn't figure out what it was, accused me of not knowing how to drive a manual and charged me £100 for the privelage! Why wouldn't they know about this?
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i own a 96 306 xsi 2.0 8v and seem to be having the same symptoms. the car revs on it own, cuts out and jerks when driving. i read this backroom chat and decided to change my stepper motor. i disconected the battery fitted it then re-connected the battery after. i found it acted a little bit better but still carried on playing up. i dont know if it makes a difference if i disconnect it afterwards.
some people have told me it could be the ecu as it is a common fault. someone please help me i really dont wanna lose to much money trying to resolve the problem.
thankyou , wilson
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I think it is certainly the Idle stepper motor. Its found underneath the throttle body and is only held in with 2 bolts so is an easy DIY job. They cost £90 for the part. Alternatively, you could take the old one out and clean it by pulling back the diapraghm (a bit like a thermostat) and seeing whether it is very dirty. If it is clean it and put it back. If the problem is the stepper motor, then this simple action will improve the situation. If not try looking for an air leak around one of the vacuum pipes that lead into the plenum chamber.
Maybe the car has an ECU upgrade which may repair the problem. This is much cheaper than a new ECU.
However I think the stepper motor is the problem.
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i have changed the stepper motor for a new one. the problem seems to be resolved for a short while and then it tends to play up again. the car seems to be much worse when cold. do you think it might be a good idea to clean out the chamber that the stepper motor sits in? could you explain to me where the plenum chamber is and what it looks like. i still have a feeling it is going to cost a bomb to get the car sorted.
should the car cut out if the stepper motor disconnected?
thankyou for everyones help it is much appreciated!
wilson
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The plenum chamber is the black rectangular box like thing to the right of the throttle body where you can see four metal pipes coming out of it going to the rear of the chamber and into the next bigger black rectangular bit which has the peugeot logo on it.
It wont do any harm to clean the area where the stepper motor sits in though you wont be able to clean the plenum chamber itself.
The ECU upgrade I mentioned is like an updated bios for the ECU. It may sort out the problem if the stepper motor avenue fails to work.
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hi, im from Peru, ive had the same problem as you guys, ive spent around 500-600 dollars trying to solve it but it was just solved for 1 - 2 months then problem starts again.
looks thats its the same problem for alot of the XU10J2(2.0 8v) owners.
the weird thing is that, everytime the local dealer used the diag to scan my car, it said it was about a thermal sensor, as soon as they deleted the code with the scanner the car become stable and no more weird revs. but just for a while.
ive changed the stepper motor, then the throttle body, map, and everything that could cause the problem, now im beggining to think that its a problem about the ECU, a friend of mine got his XSI modified, he got a ECU chip from england and his car doesnt do wierd revs anymore, as i have tested for a week (he gave me his ecu to test my car), well right now im doing a complete overhaul to my engine, and going to do some modification to the engine with a known peugeot modder we have here in Peru( fortunately he is a friend of mine), maybe im gonna order that same chip from europe cuz here in peru we dont have that kind of things, european cars are too expensive so people prefer to use more american and asian cars, its amazing how cheap can be the engine parts for this engines(american and asian), at some point i was just about to sell my 306xsi, but im love so much with this car that i just cant get rid of it... heh..... i think ill just gonna live with that failure.
here are some tips i can give you guys:
clean the stepper motor : with some carb cleaner, the nose must look to the floor, so the spray DONT get inside the sensor, just clean the nose that got the dirt.
remove your ecu, disconect it takeit out for a 15minutes then take it back, connect it and restart your engine like this:
1. acc ON / engine OFF (1minute)
2. all off (1 minute)
repeat this steps 3 times, at third start the engine and turn ON all accesories, A/C, power windows, everything and use the steering wheel both sides, right and left, this will give your engine the parameters of what low rpm must be with all accesories, this is not BS, this is a tip from a old local Peugeot dealer, i got a lot of friends there, and ive learned alot of things about this car.
for last, try to get your car to the local dealer and get it scanned, i dont think that would be that expensive.
thats it, hope this helps you guys, sorry for the bad english but hey! i speak spanish really good =D
later
RAUL SANCHEZ
lima- peru
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I have this problem on a 106 1.1. Dealer said the throttle cable was too tight and dealt with it (not a big bill).The problem is less apparent now but has not gone away completely is the next thing to try the stepper motor?
Andy
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Hi Everyone,
This is the first time I have used this site, so I may have put this query in the wrong place.
Following on from all the above problems relating to 306 cutting out - quess what? I ve got the same problem.
When I approach a junction or any situation where I dip the clutch before stopping the car begins to struggle at around 500rpm and then generally cuts out.
This has now been going on and off for around 8 months. I took it to a Pug dealer in Bristol (Templegate - Same as a comment made by someone else on this site) and they done a diagnostic and told me there was nothing wrong. Just recently, I have had the ECU reset, put a new idle control valve, or stepper motor in but the problem is still there - probably even worse than before.
In the past I have called out the AA and they have just adjusted the screw to the front of the throttle housing - not good for mpg though - Pug garage said this screw is factory set and should not be messed about with - could this be a factor. After reading all the above comments it gives me an idea that it may be a vacuum hose leaking from the phenlun chamber? Everyone I have asked about this problem does not seem to know what is causing it, even peugeot. You would have thought that they would be aware of this fault as it seems quite common. I have looked at the dates of all the above queries and they are all nearly over a year old so I dont know if any of you still look at this site.
HARRY - Are you still getting problems with your motor with regards to the cutting out and also the central locking problem - doors lock from remote but then open straight away. Can anyone help me with these problems as I am getting nowhere and feeling more and more frustrated.
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the central locking problem is probably due to a faulty actuator in a door. I had the same problem on my Xantia. Fixed it by checking each door actuator.
If it is not the idle stepper moror, it may be a vacuum leak somewhere or could possibly need a new ECU BIOS upgrade. However the old one probably isn't 'faulty' but the software upgrade sometimes does the trick. However check for a vacuum leak first!
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Hi Everyone
I have been reading this thread for a couple of weeks as I had similar symptoms for a while with a '95 XSI.Basically the car was jerking intermittently when cruising at 3000rpm - 3500rpm and after a while the ECU warning light would come on.I took it to a Peugeot dealer who reset the ECU and it ran ok for a while before the same problems returned, in the end it went back and forth to several Peugeot dealers whose only solution was to reset the ECU.In the end the revs would drop off to 500rpm at junctions/traffic lights/traffic jams and the engine would stall.It would start again straight after and not stall again until coming to a stop.I took it to an independent Peugeot specialist (he used to work at one of the dealers I had previously taken it to)He ran diagnostics on it and said the oxygen sensor was not working as it should, he reset the ECU and it was running fine.He suggested running it for a while to see if the ECU warning light would come on.I told him the history and got him to change out the oxygen sensor, and there have been no problems since.
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Hi i had similar problems with my 96 XSI, with it cutting out when i put the clutch in etc. The lambda and MAP sensors were replaced and this solved the problem. It wasnt the stepper motor in this case.
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To avoid any confusion W.R.T. to the above two posts the Lambda Sensor and Oxygen Sensor are the same thing, just in case Peugeot try and charge you for one of each!!!
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Thanks for your advise everyone. I've got my diagnostic mechanic coming round in the morning to see whats going on. I've printed all the above comments off and will run them by him and hopefully we'll get to the bottom of it. I've also sent an e-mail to Peugeot - like they'll reply!!!
I'll keep you posted...C YA
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I have exactly same problem as the OP I fell upon this site by accident on this thread!!!
how mad's that x
Not mad at all - text talk and blasphemy edited and thread classified in accordance with the "changes" - PU.
Edited by Pugugly {P} on 08/01/2008 at 19:52
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nicky
Good old Google. However; be warned that the 5-year old posts above contain rather a lot of "uninformed amateur opinions" and should be taken with a pinch of salt.
Firstly; what year and engine is your car; what's it doing wrong and what has been tried so far?
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I had the stepper motor problem on my old (company owned) S plate XSI, which was stalling, revving by itself, and once on the M42 in traffic, idling at 4,000 RPM!!
Can you believe it took the Peugeot dealer SEVEN attempts to diagnose and fix it?? "There's no fault codes logged sir and it was fine when we tested it!". No, your little box of tricks didn't tell you what to do, and you threw your hands up in the air.
When they finally diagnosed it, they didn't have a replacement motor in stock, so they cleaned and "freed up" the old one as a temporary measure. The car ran so well afterwards I never took it back to have the new one fitted.
Cheers
DP
Edited by DP on 09/01/2008 at 07:58
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Hi peeps this is a common fault usually as a result of poor engine cleaning i found it is often a series of things all put together the best way to cure this is
Change
.fuel filter £8
.air filter £5 ,ebay
.ensure all air pipes are sealed and all clips are in place replace with jubilee if not (air pipes only)
.new stepper motor,idle valve £20-40 ,ebay £100 from dealers
.new lambda,oxygen sensor £15-£60 ebay £80-125 from dealers
.finally reset ecu ,unplug battery for 20 secs then replace once work is done
Make sure you clean air intake ports and pipes if possible i took my pipes off and left to soak in hot water for about 20mins used wd40 to clean !!Before!! Water bath only not after
Shake rubbish out of pipes let them dry proprely!!
Also ensure you have the proper grade engine oil not always connected with this problem but you will notice the difference if you do
((this is all diy stuff if you didnt keep clean you would develop faults to)) hope this will help it did for me :)
{Edited to remove SHOUTING, and swearword}
Edited by Dynamic Dave on 18/05/2008 at 15:19
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