Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: andyc on 21 January 2010, 20:48:57
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One of out OMOC club members is having a spot of bother with the 2.5 V6 he has in his Manta A Series.
As you guys and the most informed with V6 issues i wondered if anyone has any ideas on the following
Cheers
Andy
A bit of history: engine 2.5 V6 X25XE.
For a while now, when starting from cold the engine will not idle and cuts out, but once it has been running for a few mins all is fine. Then yesterday it started cutting out every time I stoped, the only way to keep it running was to brake using the hand brake and keep the revs up.
My first thorght was ICV, so I swoped the ICV for a spare i had and this now caused the engine to idle at about 2000 revs, swoped this again for a 2nd spare one and still idle at 2000 revs. Put original ICV back on and still no change, 2000 revs at idle.
Cleaned all 3 and tried again, no change.
After playing around a bit I found:
1. If ICV is unpluged the revs drop to around 1000 rpm and car drives fine.
2. If ICV is pluged in but throtle pot. plug is unpluged rev drop to 1000 rpm.
tried changing the throtel pot. no change.
Then all of a sudden it seemed to sort it's self and was fine, untill this morning.
Started car and at idle revs went to 2500, the only way I can make them drop is to unplug the ICV or the throtle pot. which then drops revs to around 1000.
I've tried changing the throtle body, no change. ECU no change, I also swoped the MAF, this did drop the rpm but was now hunting very badly.
I'm at my whits end now and need help.
I don't know if this is conected, but another problem i have is that at full throtle the engine looses power, if you then lift off a little all is fine again. It seems to be only the last 1-2 mm of throtle that this happens.
Thanks for any help.
Chris.
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have you tryed changing the air temp sensor just before the MAF tell ecu what the air temp is going into the engine to adjust revs and timing. :y
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Try running it with the MAF disconnected :y
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er, air leak...? er er, elecrical conection to icv? er, any work carried out just prior to the problem starting? has he paper clipped it for fault codes? er teck 2 ? ...JAMIIIIIIE...
has anyuone alse worked on the car to try and resolve the issue? just wondering if somebody has knobbled the butterflys trieing to make it tick over not realising the icv is at fault?...nah ignore me, just re read.
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Air leak....plus a lesson in diag required!
willy nilly part changing is a fools erand