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My 1.4 daewoo lanos hatchback is over revving and staying on 3000 revvs. also we have bought a new throttle potiometer,new inner tubes all around, new idle speed control valve. so what else can we do to stop this ?
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Daewoo were bought out and rebadged Chevrolet (over here) to initially provide a second life for ageing Vauxhall designs and technology.
For a time Daewoo was just about the cheapest car to keep on the road but General Motors changed all that and now the stuff is more expensive than many of the spares for the mainline models even though they are still slightly inferior to them in design and build quality.
If you still have trouble in spite of this new information I suggest you search for parts by brake manufacturer, which is usually marked on the body of the brake caliper.
First thing to check would be transmission fluid. If it revs up in park fine and idles and moves fine but just doesn't seem to want to go good with out really revving it then you might have a blocked up Catalytic Converter.
First off, how new is your battery and how many miles on the D? Dodge vehicles are very sensitive to a failing battery. Have it load tested, and if is the least bit flaky, replace it.
After that, the TPS or throttle postion sensor is your next.
As far as the revving up and down above 3000 rpm goes, that is the PCM protecting the engine from over revving.
A vacuum leak either from a hose or the intake rubber tube running to the throttle body. Any air that enter's the engine other than the throttle body, will cause this condition. This is the best case scenario, worst case would be an intake gasket.
If your car is running rough and it's fuel injected (which yours is). Follow the air intake (black plastic box - housing the air filter that has tubing that goes to the motor) until it reaches the Throttle body (rounded metal air intake at the end of the plastic tube - has one large flap inside). You will want to remove the hose clamp and thoroughly clean the throttle body and the AIC (air idle control valve - small canister attached to the throttle body). Use off-the-shelf cleaner from any automotive store. This takes about 30mins to 1hr depending on your skill level. This will result in a cleaner smother idle and smoother performance. This is a common issue in today's cars. I have to do this once a yr to keep my modified car running happy.
Take a look at the later parts of this article for pictures to give you an idea:
This is a problem with the "auto throttle control unit" (SilverwolfRA, yes aka - auto choke).
A car computer mechanic downloaded the info. from my 1999 Nubira and then adjusted as necessary. It didn't repair to complete (as new) functionality (as the unit is damaged?), but I'm happy with the result.
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