Misfire On Warm Up

[seefive]

I have a 2002 c5 2.0sx petrol (manual) - not the HPI engine.

In colder weather, it starts misfiring about 1 minute after starting up perfectly. As soon as the temp guage gets beyond the 2 blue lines, it runs perfectly again.

It seems to be flooding My dealer has replaced the coolant temp sensor as well as the coil pack and plugs, in 2 sepearate visits. No improvement

Occasionally, it misfires immediately on starting. On a bad day I get catalytic converter fault on the screen, (accompanied by flashing engine light) followed by anti pollution (accompanied by solid engine light). Then the faults clear as if nothing happened.

Dealer can't find any faults in the ECU...

[seefive]

I have a 2002 c5 2.0sx petrol (manual) - not the HPI engine.

In colder weather, it starts misfiring about 1 minute after starting up perfectly. As soon as the temp guage gets beyond the 2 blue lines, it runs perfectly again.

It seems to be flooding My dealer has replaced the coolant temp sensor as well as the coil pack and plugs, in 2 sepearate visits. No improvement

Occasionally, it misfires immediately on starting. On a bad day I get catalytic converter fault on the screen, (accompanied by flashing engine light) followed by anti pollution (accompanied by solid engine light). Then the faults clear as if nothing happened.

Dealer can't find any faults in the ECU...

 

 

Hello again

Thought I'd dig up my old post and see if anyone has any ideas on this.

I know cat and anti-pollution faults are hugely common on C5's , but mostly on diesels, and not usually temperature - dependant like mine. I've booked the car into an idependent diagnostics specialist for January - Citroen dealers were worse than useless at diagnosing the problem - they just managed to screw up the external temp sensor, which has now settled down again. Would wlecome any comments from anyone with similar experiences.

Thanks

[seefive]

Hello again

Thought I'd dig up my old post and see if anyone has any ideas on this.

I know cat and anti-pollution faults are hugely common on C5's , but mostly on diesels, and not usually temperature - dependant like mine. I've booked the car into an idependent diagnostics specialist for January - Citroen dealers were worse than useless at diagnosing the problem - they just managed to screw up the external temp sensor, which has now settled down again. Would wlecome any comments from anyone with similar experiences.

Thanks

 

Diagnosis is not good - looks like a sticking valve. Way too expensive to proceed with, so I'll live with this until I finally run the car into the ground. Apart from this minor irritation, the car continues to be great - very reliable, smooth quiet and super-comfortable.

Seems that diesels have more "issues"....

[DaveHerns]

Diagnosis is not good - looks like a sticking valve. Way too expensive to proceed with, so I'll live with this until I finally run the car into the ground. Apart from this minor irritation, the car continues to be great - very reliable, smooth quiet and super-comfortable.

Seems that diesels have more "issues"....

Do they mean an inlet or exhaust valve ? Have you thought of an oil change and flush and a tin of injector cleaner/liquid decoke ? Can't do any harm . I think they use Wynns Injector cleaner on Rover and Ford engines which suffer from sticking valves

[seefive]

Do they mean an inlet or exhaust valve ? Have you thought of an oil change and flush and a tin of injector cleaner/liquid decoke ? Can't do any harm . I think they use Wynns Injector cleaner on Rover and Ford engines which suffer from sticking valves

 

Thanks for that . I have tried STP injector cleaner in fuel and engine treatment in oil and got a bad reaction - more misfiring than normal. Could this mean it was starting to do the job? Maybe worth tring Greased Lightning or Slick 50, or Wynns as you suggest?

[techbod]

poor idling cold start possible faults are air intake system/vacuum leaks, idle control valve-idle speed control actuator, throttle position sensor ( fault codes would be handy )

[seefive]

poor idling cold start possible faults are air intake system/vacuum leaks, idle control valve-idle speed control actuator, throttle position sensor ( fault codes would be handy )

 

Never got any fult codes, even when I took it to the main dealer with the engine light flashing!

General concensus seems to be sticking valve. I believe there are some lifter problems on Peugeot petrol engines.

 

Still not a real big issue though. I've had the car over 3 years and I've put 50,000 miles on top of the 67,000 it had done, never broken down, just some wobbly starts, mostly in the winter.

 

Seems to be better if the oil is kept right up to the maximum, with some Wynns lifter cleaner added.

[techbod]

this could be a known fault like oil not getting round the system fast enough or sludging as the yanks say so good engine cleaner might help like slick50 which puts a Teflon base on all the moving parts which makes the engine run smoother and keeping the idle easy but the throttle position sensor (TP ) is also a known fault with many cars and the idle control valve as they get funked up because of the EGR system which effects the running and rarely gives fault codes until it effects a main component like the TP sensor totally failing

[seefive]

Update on this one

 

A couple of days ago the car went straight to "AntiPollution fault" with a solid engine light, and the fault light won't clear ( first time that's happened). The car's running fine now , although it was a bit "wobbly" at the time the AP fault came up.

 

Could this mean there's a fault code stored in the ECU which may finally solve this?

 

If not do I need to disconnect the battery to clear the light? I remember reading something about a procedure which doesn't involve the dreaded battery reconnect on this site - switching off and on 5 times,or something. Can't find that post.

 

Thanks