I have a 1998 Daewoo Lanos and some months ago there was a misfire and the engine management light came on and stayed on.I took the car to a garage who replaced the throttle unit and changed plugs and leads. However the car has began to misfire again and the engine management light has now returned much to my dismay. Can you please shed any light on what the problem may be and any possible solutions.
Thanks
Stephen Hornby
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There are various ideas here, but the only way to be sure is to have an auto electrician connect a pro grade scan tool computer and take it for a run. The scan tool can record what happens when it starts to misfire.
check fuel filter and check fuel for water or contaminents
then check fuel pressure with gauge also while driving
may have pin hole in leads - spray water with salt solution over HT leads while engine running and then rev to see or here spark jump(missfire)
recheck spark plugs - did you crack any on installation/removal/installation?
what are the codes and description if stored?
what is engine live data parameters like do they look normal (right specs for range/operation)?
Is the garage you took it to a daewoo dealership? If not then try one; they should be able to run a diagnostic. If so, take to a different one.
I would think it is the o2 sensor. If you disconnected it then it sounds like you have the knowledge to replace one. When mine went bad the car didn't stall.
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