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Question

i have a 1992 oldsmobile cutlass and its backfiring when i try to start it befor it stoped run it would die when i was driving down the road and it would spit and spuder and shut off and now it wont even start

Submitted: 45 days and 17 hours ago.
Category: Car
Value: $13
Status: CLOSED
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Optional Information

Year: 1992
Make: Oldsmobile
Model: cutlsss
Engine: 3.1

Already Tried:
plugs,wires

Posted by Mad Mike 45 days and 17 hours ago.

Answer

Hello, My name is Mike and I can help you with this problem.

 

It sounds as if the vehicle is not getting the fuel it needs. You can verify this by sprayinga good dose of carburetor cleaner into the throttle body inlet and then immediately trying to start it. If it starts and stalls, then you are onto something there. Sometimes it is better to have an assistant crank the vehicle while you spray the throttle body. Be careful though, because if the engine is cranking while you spray it can backfire and catch on fire.

 

If the engine does not respond to additional fuel from the carb spray, then you swill need to verify proper spark and then check compression.

 

Hope that gets you on track,

Mike

45 days and 17 hours ago.

Reply

i have tryed all of thes things and almost cought myself on fire once dont want to try it again but befor it got really bad it would run just fine and would only shut off when i was slowing down then it started geting wers when i would be driving 50-60 it would start jumping on me like it was trying to shut of then it started shuting off

Posted by Mad Mike 45 days and 17 hours ago.

Answer

Since this problem is not as simple as a fuel delivery issue, it's going to get more difficult to diagnose. You are going to need to check for spark at all 6 cylinders, and then check compression if you have proper spark. You may want to look at the front 3 plugs to see if they are wet..

 

Hope this helps.

 

Mike

45 days and 16 hours ago.

Reply

the spark is good on all but one of the coils has a weak spark but it should still hit off of the other two right and the compression is good as well from what i was told by some one els

Posted by Mad Mike 45 days and 16 hours ago.

Answer

If it has been driven like that enough to foul the plugs, it might not run. YOu need to look at the 3 front plugs at least..

Mike

45 days and 16 hours ago.

Reply

i just put new plugs and wires in it and the old plugs were in pretty bad shape but it wont run at all it just backfire & cranks slow its got 38 pounds of fuil press its just not starting it trys to run but shut right back off

45 days and 12 hours ago.

Reply

ok bro

 

Posted by Mad Mike 45 days and 3 hours ago.

Answer

Another thing that you may want to do is verify your plug wire routing.

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45 days and 1 hours ago.

Reply

i have the wires on the car right this is not my first time working on a car my dad has his own shop in nabraska but im in NC so im ask you to help he out

Accepted Answer

I understand your situation. Thanks for the additional information.

 

At this point, you have verified fuel, and you have made sure you have good plugs and wires. If you have good compression on all cylinders, it can't be a timing chain issue.

 

I'm going to recommend at this point that you replace the coil that is giving you a weak spark. If it is weaker than the others, then you definately would not be wasting money by replacing it. A weak coil can cause a miss on 2 cylinders which in turn can foul out all 6 plugs due to the addition of extra fuel when the O2 sensor sees more oxygen due to incomplete combustion.

 

You also may need to remove the plugs and dry them all off again. Crank the engine over several revolutions without the plugs installed to clean out the combustion chambers. It only takes a few revolutions to fuel foul even new plugs. So since it has been wanting to start, this may be part of your issue.

 

If you get all of this done, and it still wont run, replace the module. I generally don't recommend replacing a part that hasn't been confirmed bad, but these are sometimes difficult to test and are often replaced after everything else has been ruled out.

 

If this answer has been helpful, please click accept.

 

Thank you,

Mike

 

 

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Expert: Mad Mike
Pos. Feedback: 100.0 %
Accepts: 
Answered: 10/8/2009

ASE Certified Technician

20 years experience, all makes and models.

44 days and 22 hours ago.

Reply

i have to order some part befor geting it runny so i will let you know if that what it is

 

 

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