Question about 1991 Chevrolet Corsica
Wont start, also backfires through carb
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Posted on Jan 02, 2017
You need to get two things checked. Ignition and Fuel.
Ignition: typically in this order ... Start off from sparking plugs ,,, move to leads (get them changed) and on to the ignition coil if there is no spark coming out of it. In case of fuel, the carb needs a clean and a good carb cleaner or fuel treatment (added to the fuel tank) wont do any harm. You should open up the carb filter. Remove it and change it if its dirty. Start the engine rev it up and while its revved up (throttle flap open) spray the carb cleaner or in this will clean the carb cleaner from inside. If the power gradually increases its a clear sign that you need to open up the carb and get the jets cleaned. properly.
Hope that this fixya will get you on the roads soon :)
Posted on Jan 07, 2009
SOURCE: 1991 Chevy Corsica
Try checking the fusible links in the wiring harness near the starter. My 91 had a similar problem where I lost my radio and my headlights. Turned out those fusible links were all corroded. replaced the bad ones (winter time- pain) and all was well again.
Posted on Mar 29, 2009
You need 3 things.
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors.
I think each injector is on a separate driver on that one.
Check for pulse to all of them.
You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel. Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
The 75-85 is only a check on the capable full pressure of fuel pump.
If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.
What are the pressure readings that you have when done.
What are your cold start pressure readings?
Post back what you have. Good luck
Posted on Dec 24, 2009
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