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Got a problem with the engine racing when stationaire, rev counter going to 2000 revs and then droping. this as caused engine management light to come on.
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sounds like an engine sensor try the crankshaft sensor as the rev counter gets its info from that , might be helpful to get the OBD read by a suitable mechanic
First things first. Check your coolant level. If that is up to snuff, then have the engine data scanned, and see if your coolant temp sensor is out of whack. If it reads very low, the pcm will give the fuel management system directions to add alot of fuel. However , as I mentioned before, low coolant can cause the temp sensor to read a cold engine(it usually must be submerged in coolant) and cause the same problem. There are more things to check, but this is the place to start. If you have no luck with these suggestions, get back to me and we'll go furthur. Good luck!
You are on the correct lines, try spraying penetrating fluid into the valve, sounds like the valve is sticking. Maybe need to replace the valve.
Also check for air leaks on the inlet side of the engine, air leaks cause revving issues. Easy way is spray a fine mist of easy start over the inlet, if the revs race up then you have a leak or pipe off.
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