craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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got a small problem,when i start the car it run's fine on cold start at around 1100 rpm but after about 10 minutes the rev's will drop to normal about 900 rpm and it will start miss firing.like it's running on 3 cylinder's,but then the rev's will rise again and it will be ok.also if you giv it a rev it will clear.i'm thinking cts?any other opinions or anyone had the same problem?
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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Could be the lambda sensor but were only guessing really, u know anyone with a wideband? Could take it to a garage to see what the AFR is doing on tickover, the lambda could be telling the ECU its lean so it chucks more and more fuel in
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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is the c20xe lamba the same as the c20let lamba?
the lamba it's self is only about 4 months old.
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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up
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SportBoy
Member
Registered: 5th Oct 01
Location: Retford, Nottinghamshire
User status: Offline
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sounds like a dicky ht lead or dissycap/rotorarm
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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will check them the weekend.they are pretty new tbh.cheers
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DAZ1985
Member
Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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mines got a misfire under load changed the cts but not tried it yet.
tick over though sounds like leads, dizzy or rotar though
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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Misfires under load are normally ignition related (plugs/dizzy) because it harder for the spark to jump the gap, ignition isn't really taxed on tickover. Do you get any soot or a smell of fuel just before it starts to misfire? Obviously a worn HT lead can cause a misfire at any load though so make sure theyre tight
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Jenko_Sport
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
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Gotta love these big block XE's
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DAZ1985
Member
Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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I'll change the lot tomorrow then 
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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ht lead's are all good.had them on my xe before and it never did this,and the same with the dizzy/rotor arm/cap.strange that it clear's when you rev it though.
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DAZ1985
Member
Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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coil module?
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Rob_Lee
Banned
Registered: 9th Dec 05
Location: Folkestone Drives: Nova 1.6 16v
User status: Offline
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had EXACT the same probs with my C20xe
Changed the dizzy cap and arm for decent new one and not cheap one and worked fine!
Try it... get some from Vaux and if it dont work take back!
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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possibly but all the ignition system was good before when it was on my xe,this is why i'm thinking cts.are the xe lamba sensor's the same as c20let ones?
well it's a genuine bosch one on there atm.but i may a brand new one.thanks for your help lad's
[Edited on 22-04-2008 by craig_s]
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luke85
Member
Registered: 26th Nov 07
Location: Chesterfield
User status: Offline
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If you do change the lambda then Id buy your old one for a tenner, just want the plug from the end of the wire if anyone has one lying around?
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carnuts
Member
Registered: 28th Aug 05
Location: Hertfordshire
User status: Offline
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think the let lambas are different mate to the xe ones
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corsa-ed
Member
Registered: 1st Dec 07
Location: brid, east yorks
User status: Offline
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check the connections on the coil, try spraying the points on your leads with silicone spray, not wd40 it will corrode the material of the ht lead, check your plugs and that the electrode gap is correct, even though you had your leads on your old engine theystill might be nackered, also try taking the dizzy cap off and check the points inside and give them a clean up, you may just need your ignition timing adjusting or something like that
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DAZ1985
Member
Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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My lambda sensor was earthing out that caused me problems. seems to be ok now
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