Misfire Madness

[seefive]

Hello

 

I've posted a few times before about the misfire on my petrol C5. (Not HPI)

 

Well, the car's just flown through the 3rd MOT in my tenure (I'm the second owner) and with autumn just around the corner - season of mists and mellow misfires - I have to make a decision, and would welcome any suggestions.

 

I've had the car coming up to three years, and this is the problem which has been annoying me for all that time. I'm losing the mental battle to ignore it.

 

Cold engine

starts fine idles smoothly for about a minute, the starts missing as the temp guage gets between the 2 blue markers. If I'm driving along at this point, not noticeable. If the engine returns to idle, very noticeable. This can occasionally result in "cat fault" message and flashing engine light. Very occasionally the car goes into safe mode Restarting cures that. Fault changes to "Anti Pollution" and the engine light goes on solid some time later, then it clears within a day. As soon as the engine's warm, it's fine.

 

Warm engine

if the temp guage is between the blue lines, slightly rough idle on start up, then smoothes out within 30seconds.

 

Hot engine

starts fine with smooth idle.

 

Occasionally, cold or warm

immediately kicks like a mule , fault lights on, can't get it under control until it's fully warmed up

 

 

In 2007 I had new coil pack, no difference , then coolant temp sensor , no difference, both at a main dealer. A non-Citroen garage reckons it's either a sticking valve, or injector.

 

I've tried 3 different injector cleaners.

 

Greased lightning - no effect

RedEx - made things worse

Tesco - made things a lot worse.

 

The fact that I'm getting a reaction makes me think it's fuel-related. Both garages that have run diagnostics indicate the problem is in no 2 cylinder ( that's second from the right as you stand in fort of the car - right?). Is it worth risking a new injector - is this a DIY job, and how difficult?

 

The car is 6 years old with 115k on the clock, so I don't have much room to move financially. Any advice gratefully received

 

Thanks

[1111stone]

Hi,

 

I am having the same problem. but mine is cylinder 3 not 2. I have had coil pack changed and tryed two types of fuel 95 and 99. also changed the spark plugs..and also the oil.

 

Please could some one help.... oh yes it is a DIY job i had to do it to another car before for differnt reasons.

[myglaren]

No help here I'm afraid but it may be worth knowing that Citroen number their cylinders from the flywheel end, not the crank pulley end like most manufacturers.

[techbod]

the cam pulley is alternating a bit like the old Honda vtec so when it has a problem it throws the timing out a little