Is this over boost? and how do I fix it?
12 July 2002, 01:55 PM
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When Cold I get this surging when holding the throttle on very lightly.
When Warmed up, and tanking it in 5th I seem to get a similar thing where the power comes in and out very slightly around 4-5 thousand revs
12 July 2002, 02:00 PM
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Hesitancy is different to overboost - hesitancy is a gentle thing (the car sort of moves in urges rather than smooth 
) whereas overboost is on hard accelaration, you equally hard stop accelerating - a sudden jerk. Passengers could miss hesitance, they couldn't miss overboost!
Anyway... at cold, a common problem. When hot, err, it shouldn't. Anybody? I can't see it being the dreaded MAF 'cos there's none of the other 'symptoms'.
What fuel do you run - have you tried Optimax for a few tanks (cleans the gunk out)?
) whereas overboost is on hard accelaration, you equally hard stop accelerating - a sudden jerk. Passengers could miss hesitance, they couldn't miss overboost!Anyway... at cold, a common problem. When hot, err, it shouldn't. Anybody? I can't see it being the dreaded MAF 'cos there's none of the other 'symptoms'.
What fuel do you run - have you tried Optimax for a few tanks (cleans the gunk out)?
12 July 2002, 02:01 PM
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AAAAAARGH!!!!
John, we've done it again! Same posting... different answers though, for a change
Another boring Friday afternoon trying to escape from what you should be doing, then
John, we've done it again! Same posting... different answers though, for a change
Another boring Friday afternoon trying to escape from what you should be doing, then
12 July 2002, 02:07 PM
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Wow quick resonse,
John, Its an RB5 with full prodrive pack but other than that its standard.
Nom, sounds more like hesitation its only very slight its not a big drop in power.
John, Its an RB5 with full prodrive pack but other than that its standard.
Nom, sounds more like hesitation its only very slight its not a big drop in power.
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07 December 2002, 01:58 PM
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Cold thing is normal - probably a slightly suspect cold start fuel map.
Hot hesitation could well be overboost - you need a boost gauge to diagnose it. Do you have any modifications? (eg exhaust)
It could be that the solenoid pipework is clogged from overfilling with oil and needs a clean with brake cleaner.
Alteratively if the boost is OK you might want to look at the age, gap and condition of the spark plugs.
[Edited by john banks - 7/12/2002 1:59:15 PM]
Hot hesitation could well be overboost - you need a boost gauge to diagnose it. Do you have any modifications? (eg exhaust)
It could be that the solenoid pipework is clogged from overfilling with oil and needs a clean with brake cleaner.
Alteratively if the boost is OK you might want to look at the age, gap and condition of the spark plugs.
[Edited by john banks - 7/12/2002 1:59:15 PM]
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