Question about 1991 Buick LeSabre

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My engine turns over, it starts runs about 3-4 seconds, backfires, then shakes and shuts off. it over heated a few to many times, and ideas on what the problem might be?

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  • 18 Answers

Melted catalytic converter...valves sticking ...timing belt jumped time. .ignition timing

Posted on Oct 14, 2013

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Posted on Jan 02, 2017

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SOURCE: Buick park avenue engine start problem

Try replacing the coolant control temp sensor, the one to the computer (usually it will have two wires), not the sensor to the temp light or gauge (usually has only one wire).

Posted on Apr 20, 2010

samtoler
  • 666 Answers

SOURCE: you have to crank the engine 3 different times to

this sounds like the anti theft system is failing

Posted on Jun 10, 2010

  • 7 Answers

SOURCE: ok i have replaced my igniton module and fuel pump

overloading with fuel

Posted on Nov 08, 2011

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Nov 23, 2015 | Cars & Trucks

Tip

Over heating


Cold engine - - check that coolant level is correct - Ignition on but engine not running - set heter temp settings to max - set fan manual to one of the lower speeds - start engine and within 30 seconds rev it 3-4 times up to 3000rpm - shut off engine before end of 30 seconds (before it starts to heat) - reset climate to normal settings - recheck coolant and top up if necessary. Hot engine. - take car for a run to get up to operating temp - using caution - slowly open the bleed valve (steam and bubbles may come out) - close as soon as you see liquid coolant without excessive bubbles. - do not overtighten this as they are plastic threads. Just snug till it seals fully. - after engine cools check the coolant level again and top up if necessary. Check coolant level every few days for a few weeks and top up again if required - repeat the Hot engine bleed process again. If coolant keeps droping after 2-3 top ups have the system pressure tested. If you are still getting over temps have it analysed by a dealer. The temp is controlled by the engine computer so there may be another fault.

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If it has a timing belt,that is your problem

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If you spray starting fluid in the air intake, does it stay running? I would go to harber freight and get a cheap fuel pressure tester and hook it into the fuel line. It hsould be about 40 psi, and hold for about 30 minutes after shut down without bleeding down too much, like 5 psi.

Try this too. Turn key to ON, wait 5 seconds for the pump to shut off. Then turn key off and listen for the realy to "Cclick" under the dash (about 10 seconds). Repeat this. Then start engine. This primes the lines & injectors if you are getting bleed down due to a bad check valve in the fuel pump.
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When it is cold or damp outside my 94 jeep grand cherokee has a really hard time starting. starter is working but it takes many cranks to start. when it does start running it runs rough for a few...


Hi! As a first course of action please have an oil change. The oil can be burnt which can cause the engine to shake during cold start ups. Experienced this myself and an oil change was a helpful idea. Hope this helps and thank you for using FixYa!

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My buicks battery has just died. When I jumped it it goes to turn over for a second with a click and then dies down, but all the lights come on. How do I know if its the starter alternator or battery


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Jan 01, 2010 | 1990 Buick LeSabre

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