Question about 2002 Buick LeSabre
An engine needs five things to run: spark, fuel, air, compression and timing. Compression is the next easiest thing to test, so that would be my next step. Note that timing is actually two items, ignition timing and valve timing, however compression is, to a large degree, dependent upon valve timing. If you find poor compression across all cylinders you've likely jumped valve timing.
Posted on Nov 10, 2014
Have you done a compression check? Just a possibility that you have a bad timing chain. This would show on a compression check. Also a possibility would be a crank sensor failure. Sorry but guessing is about all that can be done without testing. I used to have a 3800 that stripped the teeth on the cam gear. acted the same.
Posted on Nov 10, 2014
First thing is to check compression of engine and timing of the valves.
Posted on Nov 09, 2014
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Posted on Jan 02, 2017
It is a sign of a clogged convertor, but i happen to own the same car (with a series 2 3800) and had the same symtpoms going on when i bought if for the wife. Mine turned out to be a Exhaust Gas Recirculation Valve (EGR Valve).
To kind of get a feel for what is going on with the convertor, you can have someone help you but sitting in the drivers seat, with the car running. You go behind the car near the tail pipe. Now have the other person rev it up a little, not to much though. Put your hand but the tail pipe to see what kind of pressure the exhaust has. You can use another vehical to do the same thing to feel what things are supposed to feel like. If the convertor is plugged, the pressure of exhaust coming out will be a lot softer than it should be.
If after checking it as discribed above, if you feel it is plugged, grab a hammer, and bang the heck out of it. This will break up and loosen the clogged part without have to replace it.
There is no really good way to test a EGR vavle without a special computer. Replacing it however, does seem to me as the most likely repair for this vehical. It is located on the top of the drivers side of the motor. It look like a cylinder with a wire coming out of the cap, and is held on by 2 13mm nuts.
Posted on Mar 24, 2010
Could be two things, your oil pump pick tube is clog, oil pan would have to be drop to check, or your camshaft bearing worn causing low oil pressure,I would not say piston rod bearing or main bearing, cause there's no knock noise. You will have better oil pressure when cold due to oil much thicker. so I would forget about a bad oil pump.
Posted on Jun 04, 2010
next time it won't run after it heats up, spray or pour water in crank sensor and see if it will start. I have seen new crank sensors go bad.
Posted on Jan 09, 2011
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