Question about 1991 Chevrolet Lumina
It starts fine when cool,but after driving it and it sits for 30 minutes,it is very hard to start,have replaced egr valve,map sensor,fuel pressure regulator,fuel filter,and ecm.
Just because you replaced the fuel pressure regulator does not mean it is working correctly; which is the most common cause of your problem. Hook up a fuel pressure guage and watch what happens when you are starting it cold - it should go up to about 47 PSI and once started it should read between 40-47 PSI, then when you turn the engine off: Does the pressure drop? There is a check valve built into the fuel pump also; that can be faulty and if the pressure is generally reading low and the check valve is bad- this can also create your problem. We have run into this before also; When the fuel pump is cold the internal pump seals are sealing great, but after a period of running time the pump seals lose sealing power and if you try to start it again it will be hard to start. The biggest thing with this situation is getting the fuel pressure readings at the following points of time:: Start-up, running cold, running at normal operating temp, engine off, engine re-start.
Pete/ Bambenek Auto LLC
Posted on Apr 15, 2014
Testimonial: "THANKS FOR YOUR HELP.ECM WAS FLASHING DIFFERENT CODES,THAT WAS WHY I REPLACED THE PARTS.SO I GUESS THE NEXT THING TO DO WOULD BE TO CHECK THE FUEL PUMP.COULD COIL PACK CAUSE THIS AND IF SO HOW DO YOU CHECK IT?I JUST BOUGHT THIS CAR AND THERE WERE SIGNS THAT SOMEONE HAD BEEN IN THE SAME AREAS I WAS HITTING.I CANT AFFORD TO KEEP THROWING MONEY IN THIS."
Replace your starter.
Posted on Apr 15, 2014
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Posted on Jan 02, 2017
SOURCE: 1999 chevy blazer fuel problem
probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold
Posted on Nov 30, 2008
SOURCE: 1999 chevy silverado 4.3 new
I just replaced the fuel pressure regulator and now I am hearing a vibrating noise from the fuel line under the truck. What do you think the problem is.
Posted on Jan 09, 2010
SOURCE: 1992 Lumina Backfire - I
I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?
Posted on Nov 15, 2010
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