Question about 2002 Buick LeSabre

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2002 buick lesabre will not start. Pulls no codes has good spark on all coils. Getting plenty of fuel. Not sure what to do with it. 3800 motor.

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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

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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

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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

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SOURCE: Car won't start Buick Lesabre 1998

Fuel pump is in tank, but ck the crankshaft sensor front of engine near pully for proper connection

Posted on May 28, 2009

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SOURCE: Buick LeSabre makes funny sound!!!

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.

Good Luck....

Posted on Mar 24, 2010

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SOURCE: I have a 1994 buick lesabre it starts ok but stutters and stalls

Try a crank sensor yet?

Posted on Apr 23, 2010

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SOURCE: 1995 buick lesabre limited, oil gauge issue

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

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SOURCE: 94 buick lesabre 3800 engine, stalls after 10 mile

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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92 buick lesabre ran great to store, when leaving, starting car resultedin chuging and popping noise, then fail to start. very good cranking speed. lots of gas in tank. i hear fuel pump operating, and gas...

I would recommend that you check to see if you are getting spark from the coil/coil packs. If this is not the issue, then you may be looking at a timing problem.

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My 1994 buick w/3800 engine suddenly started "stumbling" and not running above an idle. when it does run for a little while, when you try to accelerate it "bogs" and if you try to push the accelerator it...

I would put a new fuel filter on and try that. If that didn't work, sparkplugs and wires, and a distributor cap and rotor. Also make sure your air filter is clean.

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My buick will not start. if i hold down the gas pedel it will the start but if i let it up the car will die. what might be wrong?

One or both of your coil packs are likely faulty and not all cylinders are getting spark.

A plugged fuel filter may also cause this. As well as bad fuel pump. I would first check to make sure that you are getting spark to all cylinders first. You can remove one plug at a time and lay on engine block, have someone else turn motor over while you watch to see if every plug is getting spark. Do one plug at a time. If one or two plugs aren't sparking, than coil pack is bad, If not spark, then crankshaft position sensor is faulty.

If spark is good, check for fuel pressure at fuel rail. there is a test valve on the rail. If pressure is low, then filter could be plugged, or your fuel pressure regulator is faulty. You can test power to it with a voltmeter. Or test unit itself with an ohmmeter.

You can go to and register for full free online repair manual.

Sep 23, 2009 | 2000 Buick LeSabre

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