Hi
I have a 1.8 R Vauxhall Vectra, which has a problem with its revvs.
When Ive been driving for a little while (especially around town) the revvs start behaving a little erratically, surging from 1000 up to 2000 and back down again over about 3 second cycles. Additionally, when i depress the clutch to change gear for instance, even though ive taken my foot off the gas, the revs still lift a little before dropping (if this is relevant).
Ive chercked all the air sensor connections on the intakes, cleaned the Idle control valve and breather pipe with carb cleaner (twice), replaced the air filter and yelled at it loudly.
What can I try now as im running out of ideas and patience.
Im sure this isnt doing much for my economy, but 2 old ladies were not a little bit concerned yesterday as i sat at a crossing with my engine roaring at them!!
Any help much appreciated
Peter Groom
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My 98R 1.8 will occasionally do this, not often enough to warrent me doing anything about it yet. No help I'm afraid, but at least your not alone.
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It could be that you need a new idle control valve, as cleaning does'nt always do the trick. After putting a new one on mine it was perfect and I've had no trouble for a year now.
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I had this problem on a 2.0SRi Vectra.
Cleaning the idle control valve worked for a while, but the problem recurred. A new valve fixed it.
LS
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A new IAC valve on my old Vectra cured this problem for 9 months, then it came back worse than ever.
Got rid of it in the end - the car, not the valve !
Steve
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When fitting new IAC valve (best prices usually from Autovaux 01924 376003), or cleaning old one, also ensure throttle housing and butterfly are clean, and unblock the crankcase breather port at base of throttle housing (enters manifold either on N/S or at front. Throttle Position Sensor and base idle setting may also require adjustment if they have previously been "got at" !
Regards, Adam
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