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clio_rsi_turbo
17-11-2007, 21:16
Ive just gotten my car ready for sale, and ive just found someone willing to buy it, but the day before they arranged to collect it, it started miss firing! sods law.

its almost like it running on three clyinders but it wont do it all the time, sometimes its hard to start too.
so far ive replaced: exhuast sensor, dizzy cap, rotor arm, ht leads, spark plugs, map sensor, removed injectors and checked they're working fine and evenly, checked fuel pump, renewed coil pack & cleaned the ICV, all with no effect!! ive also removed every single electrical connection and coated with WD-40.

So as you can imagine, im pretty pissed about it having spent all this money with no effect at all!

Anyone have any other suggestions? help me please :cry:
clio_rsi_turbo
17-11-2007, 21:17
Ps its just a standard valver lump in there.
arj256
17-11-2007, 21:57
Theres no oil on the spark plugs / Ht leads?
Could have a leaking rocker cover gasket.

Give your earths a check.
clio_rsi_turbo
17-11-2007, 21:59
there was a little oil on two of the spark plugs, by that i mean on the outside, could that really cause this tho?
arj256
17-11-2007, 22:03
Depends how little it is.
If its enough to get between the contacts of the lead and spark plug then can cause problems.
Made my old valver misfire that did.
clio_rsi_turbo
17-11-2007, 22:07
ok well i'll double check it tommrow, cheers mate.
drsmith1979
17-11-2007, 23:18
also check the coolant temp sensor, can give a dodgey idle and poor running. When changing the leads, did you put them on the right order into the dizzy?
drsmith1979
17-11-2007, 23:21
also check that the ecu compartment isnt damp or wet so causing issues there.... oil in the plug wells will more than likely be from a leaking rocker cover gasket...
BRUN
17-11-2007, 23:43
TDC sensor can cause various problems, especially poor starting, has that ever been replaced ?
Coops
18-11-2007, 11:21
comp test it aswell to eliminate h/g failure.
clio_rsi_turbo
18-11-2007, 23:39
HG is fine, ive already checked that.
HT leads are in the right order too, i changed them 1 by 1 so that they didnt get mixed up, plus the problem was there before i changed them.
TDC sensor is fairly recent.

Im now fairly sure its the oil in the plug holes, but because of the dam rain today, i havn't had a chance to look yet.

thanks for all your suggestions, i'll report back my findings.