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94 buick lasabre dies at running temp

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New User

Mar 17, 2013, 10:16 AM

Post #1 of 2 (809 views)
post icon 94 buick lasabre dies at running temp Sign In

i have a 94 buick la sabre that dies when it reaches running temp. at this point it wont start for about 10 - 15 mins. then after that it usually runs ok, sometimes with the check engine light on. i cant seem to retreve codes at all. im told it is OBD 1.5 and only the dealer can do it, although they cant tell me the cars birth date. i've replaced quite a few parts including; the icm, the plastic upper intake, coolant temp sensor, therostat, full tune up, all with no luck. i used to wrench myself for a few years but this things got me questioning everything. any advise would greatly appreciated.

(This post was edited by lovelife on Mar 17, 2013, 10:19 AM)

Hammer Time
Ultimate Carjunky / Moderator
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Mar 17, 2013, 1:36 PM

Post #2 of 2 (775 views)
Re: 94 buick lasabre dies at running temp Sign In

   All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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