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Author misfire at idle..
Jake
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Registered: 24th Jan 05
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   29th Nov 06 at 17:01   View User's Profile U2U Member Reply With Quote

..When cold. Started doing it yesterday evening, ever since i bought the car there has been slight overfuelling on no.4 cylinder i think(one nearest dizzy block) and has always felt slightly rough for a couple of seconds when cold but always cleared up. This misfire, at least i think its a misfire, shakes the whole car and is present up to 3k but never does it when moving. My temp gauge is also rather erratic and moves between 88-91oC within the space of 30seconds. Would the CTS be the possible cause of all this mayhem?

[Edited on 29-11-2006 by jake]
Jake
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Registered: 24th Jan 05
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29th Nov 06 at 22:15   View User's Profile U2U Member Reply With Quote

another thing the speedo is kind of wobley up until 30mph, after which it is steady. WHAT the fuck is up with this car?
PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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29th Nov 06 at 22:22   View User's Profile U2U Member Reply With Quote

speedo will just be the cable, no issue there, just get a new speedo cable & fit it...

engine does sound like cts though, but the temp gauge on the dash is from a seperate sensor, so might be worth checking plugs, leads...
Jake
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Registered: 24th Jan 05
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29th Nov 06 at 22:32   View User's Profile U2U Member Reply With Quote

ok the speedo thing is probably my fault as i wobbled it about quite alot trying to plug it back in to the clocks. Im gonna start it up tomorrow and pull the lead from the overfuelling cylinder and see what happens. Cheers Paul.
gsimark
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Registered: 14th Dec 05
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29th Nov 06 at 22:54   View User's Profile U2U Member Reply With Quote

what motor you got mate
Nic Barnes
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Registered: 5th Apr 04
Location: nowhere near ginger people
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30th Nov 06 at 16:56   View User's Profile U2U Member Reply With Quote

ttt
Jake
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Registered: 24th Jan 05
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30th Nov 06 at 18:08   View User's Profile U2U Member Reply With Quote

cheers, its a 16xe engine. Pulled the no.3 lead out which was the one overfuelling and the engine note changed. Could it be the injector?
PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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30th Nov 06 at 18:32   View User's Profile U2U Member Reply With Quote

doubtful to be the injector...

you got any spare leads?? what condition are the plugs in??
Jake
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Registered: 24th Jan 05
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30th Nov 06 at 18:44   View User's Profile U2U Member Reply With Quote

they were changed about 1.5k ago but before i changed them i noticed no.3 plug had overheated a little bit(white casing gone brown near the threads) and was abit sooty. The newer one has gone the same i believe.
Jake
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Registered: 24th Jan 05
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30th Nov 06 at 18:45   View User's Profile U2U Member Reply With Quote

The leads also look spanking new. The engine has just gone onto 39k
PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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30th Nov 06 at 19:17   View User's Profile U2U Member Reply With Quote

if it does it when cold, could be:

air intake/vacuum system leak
idle air control (iac) valve
throttle position (tp) sensor
ecu (doubtful)

PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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30th Nov 06 at 19:22   View User's Profile U2U Member Reply With Quote

and given the temp going up & down like you say, i'd hazard it more a leak on the intake or a vacuum leak somewhere...
Jake
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Registered: 24th Jan 05
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30th Nov 06 at 19:37   View User's Profile U2U Member Reply With Quote

ok cheers Paul, ill have a nosey about.
Jake
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Registered: 24th Jan 05
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2nd Dec 06 at 18:07   View User's Profile U2U Member Reply With Quote

done a compression test today

125,125,145,145

clearly something is wrong but what is the psi supposed to be on all four?

 
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