Uneven cylinder firing

boxman · Oct 28th, 2005, 11:26

Hi Everyone
I've noticed that over the last few weeks my 92 200f engine has begun to "wobble" whilst idling more noticeably than before. It can be felt from inside the car, and can be seen by watching the engine. Every 4-5 seconds it rocks on it's mounts more severely than the usual tick over movement. Also when driving a muffled
"puffing/ringing" noise throughout the rev range can be heard. It appears to be firing on all 4 cylinders and apart from the wobble, it starts and idles fine and runs o.k despite the noise. I initially thought the pronounced movement could be worn engine mounts (now replaced) but no change. I am sure it must now be one or more of the cylinders running unevenly. Have checked:

Air intake for leaks
changed: rotor/dist cap /plugs /HT leads /fuel filter/ air filter
valve clearances checked
timing checked
There are no fault codes showing.

I still need to check injectors - is there any easy way to check individual injectors? They seem to be clicking nicely, how can I check if they are spraying evenly? Do I have to remove the whole rail?

Any help is appreciated.

Many Thanks - John

Peter D · Oct 28th, 2005, 14:33

When you say you have checked the leads what resistance where they and are you sure to tested from the metal to metal bot a probe into the centre carbon core. What timing figures did you use and from where I have a problem with my 93 200F at the moment so the figures would be interesting. Injectors can be cleaned and flow checked for about £4 each plus all new seals but use a good injector cleaner thru the system. Also check the intank lifhter pump is working, listen in the filler for the pump wiring. Just link fuse 4 and 6 to fire the pumps up without ignition off. Come Back with results. The puffing noise concerns me as that is what a sticking valve does but rare on this engine unless really coked up valves. Regards Peter

boxman · Oct 30th, 2005, 16:25

Peter - Thanks for your reply
Old leads were not checked for resistance, simply exchanged for new, with no improvement, the timing is a strange one- I'm constantly told no adjustment can be made, all I did was to use a strobe against the flywheel markers (it was spot on at 12deg before tdc)so all I know is that is not a problem.
The in tank pump is working O.K. and I've used some injector cleaner in the petrol tank.
The ringing / puffing noise is really bugging me but as soon as I get to the problem I'll let you know !!!!!

Cheers - John

Oct 28th, 2005, 11:26	#1
boxman Member Last Online: Aug 8th, 2017 21:33 Join Date: Dec 2004 Location: edinburgh	Uneven cylinder firing Hi Everyone I've noticed that over the last few weeks my 92 200f engine has begun to "wobble" whilst idling more noticeably than before. It can be felt from inside the car, and can be seen by watching the engine. Every 4-5 seconds it rocks on it's mounts more severely than the usual tick over movement. Also when driving a muffled "puffing/ringing" noise throughout the rev range can be heard. It appears to be firing on all 4 cylinders and apart from the wobble, it starts and idles fine and runs o.k despite the noise. I initially thought the pronounced movement could be worn engine mounts (now replaced) but no change. I am sure it must now be one or more of the cylinders running unevenly. Have checked: Air intake for leaks changed: rotor/dist cap /plugs /HT leads /fuel filter/ air filter valve clearances checked timing checked There are no fault codes showing. I still need to check injectors - is there any easy way to check individual injectors? They seem to be clicking nicely, how can I check if they are spraying evenly? Do I have to remove the whole rail? Any help is appreciated. Many Thanks - John

Oct 28th, 2005, 14:33	#2
Peter D Peter D Last Online: Mar 2nd, 2015 21:03 Join Date: Dec 2002 Location: Livingston	RE: Uneven cylinder firing When you say you have checked the leads what resistance where they and are you sure to tested from the metal to metal bot a probe into the centre carbon core. What timing figures did you use and from where I have a problem with my 93 200F at the moment so the figures would be interesting. Injectors can be cleaned and flow checked for about £4 each plus all new seals but use a good injector cleaner thru the system. Also check the intank lifhter pump is working, listen in the filler for the pump wiring. Just link fuse 4 and 6 to fire the pumps up without ignition off. Come Back with results. The puffing noise concerns me as that is what a sticking valve does but rare on this engine unless really coked up valves. Regards Peter

Oct 30th, 2005, 16:25	#3
boxman Member Last Online: Aug 8th, 2017 21:33 Join Date: Dec 2004 Location: edinburgh	RE: Uneven cylinder firing Peter - Thanks for your reply Old leads were not checked for resistance, simply exchanged for new, with no improvement, the timing is a strange one- I'm constantly told no adjustment can be made, all I did was to use a strobe against the flywheel markers (it was spot on at 12deg before tdc)so all I know is that is not a problem. The in tank pump is working O.K. and I've used some injector cleaner in the petrol tank. The ringing / puffing noise is really bugging me but as soon as I get to the problem I'll let you know !!!!! Cheers - John

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