Regardless of speed, when throttle pressed lightly, for example maintaining slow speed in traffic, engine misfires, never fails when accelerator pressed further. Has anyone ideas what this could be. Many thanks.
Edited by Pugugly on 24/04/2008 at 13:38
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is it a missfire or is it more of a shunt backwards and forwards, if it was a miss it should do it underload not on light throttle, i would suggest more likely an erg problem, there is/was a rework for this problem (if it is this problem) removal of the egr valve a blanking plate fitted and a software update, a dealer only job i am afraid, may be worth talking to your friendly dealer and getting them to try it and see what they recommend
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Thanks for reply, we will take your advice will keep posted as to the results.
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Hi, we are having the COIL PACK replaced, a local mechanic has suggested it could be this after that he has suggested if this does not work he would arrange a diagnostic.
Will keep udated
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02 2.2 Misfiring
Is this the direct petrol engine?
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Hi thanks for reply, yes it is a direct petrol engine.
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throwing a dis pack at it as a best guess is realy the wrong way to go, a diagnostic check would be first port of call, as i asked before is it a missfire or more of a sort of shunt (like you are lifting on and of the throttle, but very lightly) any other symptons that you have noticed
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Hi Yes is it more of a shunt, it makes for a very uncomfortable ride as a passenger.
Also you are right , changing the coil pack has not worked. Will arrange for a diagnostic in next week or so, do you know if a diagnostic is likely to show up what is wrong, some people say even a diagnostic might not show up the problem are we just throwing good money after bad. Many thanks Janette
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Janette
The new buzz-word "diagnostic" [as a noun] is one of those nebulous Americanisms that now pepper our once-great language.
I think that it originated in Star Trek as the only way to fix whatever peg they'd hung the story on that week. [I'm still hoping that their other stock resort of "try reversing the polarity" also catches on - as the resultant escape of smoke would improve my profits ten-fold.]
In reality; a diagnostic test isn't anything of the sort. It's merely a machine accessing and displaying the self-diagnostic program of the, in this case, engine management ECU.
Whether it will help largely depends on the ECU's programmed ability to record aberrant events; if it has noted the misfire, it may also supply some useful information as to it's cause - or it may not have lasted long enough to have been considered worthy of record.
When it come to using the vast amount of real-time data that's also accessible; then everything becomes dependant on the ability of the person holding the diagnostic interface tool. If he's someone of the calibre and experience of TB, then you may be in luck. If not...?
In any diagnostic process, the acquisition of all available information is a necessary first stage. Checking for any recorded fault-codes and data is clearly an integral part of that process. Hopefully, it will bear fruit in your case.
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Many thanks, will keep our fingers crossed
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Hello Janette
Just want to know did you get this problem sorted if so was it the EGR valve.
Or wat was the problem because i have the same problem in my 03 1.6 vectra.
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Hi Janette,
Having read all replies,agree whole heartedly with screwloose....diagnostics only extract fault codes stored in ecu,and not every component is monitored for faults by ecu.One thing spring to mind,and that is if your vehicle has an electronically operated throttle(to coin a phrase,fly by wire),then the accelerator pedal will have a 'throttle pot',which gives a variable resistance to the ecu,it then knowing what you want the car to do(speed up,or slow down,etc).This pot may be faulty.
Just a thought.
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