Citroen xantia misfireing once warm
Moderator: RichardW
Citroen xantia misfireing once warm
I've been searching for about a week trying tO find what might be the problem and came the conclusion that the coil pack was on its way out but I managed to plug it in to a Bosch diagnostics and I had 3 fault codes all to do with the O2 sensor, but would the O2 sensor cause the mAssive misfire on it own. Also does the ecu store fault codes until there cleared in other words if I had a problem with my coil packs would there be code stored in the ecu as when it was plugged the car was running fine?
Nick
Nick
Re: Citroën Xantia misfireing once warm
Misfires will cause unburned fuel into your exhaust, this may give a O2-sensor fault.
An O2 sensor will usually not give misfires - My 5£ is on the ignition coil. The faultcode will be there, until there cleared, if i remember correct.
An O2 sensor will usually not give misfires - My 5£ is on the ignition coil. The faultcode will be there, until there cleared, if i remember correct.
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Re: Citroën Xantia misfireing once warm
Rather than just read fault codes what needs to be done is to observe the data-flow, i.e. the information running to and from the ECU, this will allow you to for instance to see what the Lambda sensor is doing, it should once warmed swing quickly from 800 to (IIRC) 100 repeatedly, what it does is constantly adjust the mixture from rich to weak, one end of the scale is weak, the other rich so if the lambda sensor was stuck or swinging too far especially towards the weak end of the scale that could cause a misfire.
The coil pack is a likely suspect as Carsten describes, it could be a wiring fault, difficult to say without further info, what exactly were the Lambda sensor faults?
Reading codes is one thing, understanding what they mean and what's happening i.e. cause effect and remedy is another thing altogether.
The coil pack is a likely suspect as Carsten describes, it could be a wiring fault, difficult to say without further info, what exactly were the Lambda sensor faults?
Reading codes is one thing, understanding what they mean and what's happening i.e. cause effect and remedy is another thing altogether.
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Re: Citroën Xantia misfireing once warm
The ignition coil is the most likely culprit Nick as for them to fail when hot is their normal failure mode. You don't say what Xantia it is but don't forget that the Turbo CTs (and maybe others) have an ignition amplifier which can also cause this same issue.
The V6's put a fault code in the ECU if the coil goes faulty and brings on the engine management light as well as making the car practically undrivable.
let us know the exact model, age and precisely which engine and we can then confirm...
The V6's put a fault code in the ECU if the coil goes faulty and brings on the engine management light as well as making the car practically undrivable.
let us know the exact model, age and precisely which engine and we can then confirm...
Jim
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
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Re: Citroën Xantia misfireing once warm
i've been on the phone with nick this evening, i am 99% its a coil pack as its using excessive fuel, only running on 2 cylindars and as said only does it when hot, i'll be popping over on monday with the lexia to confirm, its a 99 2.0 16v xant
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1998 Xantia Activa S1
1971 D Special
2006 C3 1.6 HDi SX,
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Re: Citroën Xantia misfireing once warm
Looks like the ECU is operating in 'limp home' mode if its only firing on two.
It is worth checking the insulator between the coil pack and the sparkplug as I have seen this a few times. The insulator gets dirty from oil from a cam cover leak, eventually the insulation breaks down and the current from the coil tracks at higher engine revs as it can no longer cope. This is not prevalent on just the 2.0 16V engine but on a few of the PSA engines with the coil pack mounted between the cams. I now keep a stock of new insulators for a few different engines. Check the price from Citroen for the sets!
Let me know if you need one or two, as I might be able to help.
H
It is worth checking the insulator between the coil pack and the sparkplug as I have seen this a few times. The insulator gets dirty from oil from a cam cover leak, eventually the insulation breaks down and the current from the coil tracks at higher engine revs as it can no longer cope. This is not prevalent on just the 2.0 16V engine but on a few of the PSA engines with the coil pack mounted between the cams. I now keep a stock of new insulators for a few different engines. Check the price from Citroen for the sets!
Let me know if you need one or two, as I might be able to help.
H
Re: Citroën Xantia misfireing once warm
I must say a big thanks to Chris570 for taking time out after work tonight to come and help me out with some diagnostics and filling me in with some information about known troublesome areas and other faults that are knocking around the ecu i.e suspension.
Anyhow I ordered a coil pack tonight which Im hoping will cure my problem.
Also any ideas where I can find a break switch pedal as the ecu constantly thinks that my foot is on the brake which could be a contributing factor as to why my cruise control is not working?
Nick
Anyhow I ordered a coil pack tonight which Im hoping will cure my problem.
Also any ideas where I can find a break switch pedal as the ecu constantly thinks that my foot is on the brake which could be a contributing factor as to why my cruise control is not working?
Nick
Re: Citroën Xantia misfireing once warm
not a problem, its worth taking it off and giving it a clean
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Re: Citroën Xantia misfireing once warm
This may be a contributory cause Nick. On some ECUs if it sees the brake pedal and accellerator pressed at the same time then it sees this as wrong and does not allow correct operation. On yours this may manifest as a misfire. Worth checking...nick19800 wrote: Also any ideas where I can find a break switch pedal as the ecu constantly thinks that my foot is on the brake which could be a contributing factor as to why my cruise control is not working?
The cruise brake switch is not the same as a standard switch. It has two sets of contacts - one for the brakes and one dedicated to the cruise control.
If you search out a thread I did long ago on cruise problems the switch and how to fix it is described in good detail.
Jim
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Re: Citroën Xantia misfireing once warm
The car was running perfectly fine when it was plugged into the lexia but as soon as I left to go home I got about 5 yards down the road and was running crap which is typical so essentially wouldn't the dwell readings be correct as it was running fine when it was reading the data?
Any ideas as to what the correct name for the brake switch is and where I could find one as I'm struggling a bit to locate one.
Nick
Any ideas as to what the correct name for the brake switch is and where I could find one as I'm struggling a bit to locate one.
Nick
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The brake switch is in the pedal base itself. There's a connector upstream on the pedal "arm"; you will have to be upside down in the footwell to really see it.
Normally even a dead/dying coil will show crap reading when cold - you just don't notice the effect until it's hot and loaded up. Getting the motor warm and stalling it up will simulate loading to some extent.
They are overall a simple ECU, so diagnostics/repair is a matter of physical checks first, then basic supply items, then parameters.
Normally even a dead/dying coil will show crap reading when cold - you just don't notice the effect until it's hot and loaded up. Getting the motor warm and stalling it up will simulate loading to some extent.
They are overall a simple ECU, so diagnostics/repair is a matter of physical checks first, then basic supply items, then parameters.
Re: Citroën Xantia misfireing once warm
Problem solved!!!
Chucked the newish coil pack on along with some new BKR6's and its not skipped a beat.
Thank God, it was driving me mad.
Thanks for everybodys help.
Nick
Chucked the newish coil pack on along with some new BKR6's and its not skipped a beat.
Thank God, it was driving me mad.
Thanks for everybodys help.
Nick