I just bought a 1999 Chevy Blazer 2 door 2 wheel drive. Got it for cheap cause the guy said he didn't have the money to replace the fuel pump. It started and ran smooth at idle before i bought it, but would die when you gave it gas at around 1000 rpm. I drove it a few blocks home but couldnt go over 10 mph. Next day i figured id change the fuel filter to see if that would help and it didnt. I bought a new fuel pump and put it in and it does the same thing. I thought maybe the new pump was weak so i put a fuel gauge on it and it read 60 psi when i turned the key and 55 when it was at idle. While it was running i unpluged the mass air flow sensor with no change. Plugged that back in and unplugged the throttle positioning sensor, still does the same thing. Then i swappes the map sensor from my 96 blazer and it still runs the same. Bout outta ideas other than tune up or injector issue. Any ideas?
1999 Chevy Blazer Starts and idles smooth but cant rev past 1000rpms
Brayden24s
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I just bought a 1999 Chevy Blazer 2 door 2 wheel drive. Got it for cheap cause the guy said he didn't have the money to replace the fuel pump. It started and ran smooth at idle before i bought it, but would die when you gave it gas at around 1000 rpm. I drove it a few blocks home but couldnt go over 10 mph. Next day i figured id change the fuel filter to see if that would help and it didnt. I bought a new fuel pump and put it in and it does the same thing. I thought maybe the new pump was weak so i put a fuel gauge on it and it read 60 psi when i turned the key and 55 when it was at idle. While it was running i unpluged the mass air flow sensor with no change. Plugged that back in and unplugged the throttle positioning sensor, still does the same thing. Then i swappes the map sensor from my 96 blazer and it still runs the same. Bout outta ideas other than tune up or injector issue. Any ideas?
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2,610 Posts
A tune up is a good idea. AC Delco cap and rotor.
Do a fuel pressure test and leak down. 60-66psi key on engine OFF. Pressure should not drop below 55 psi after 10 minutes.
A fuel system that drops more than 5 psi in 10 minutes has a leak in one or more of the following areas:
If that all checks out start looking for a vacuum leak.
Do a fuel pressure test and leak down. 60-66psi key on engine OFF. Pressure should not drop below 55 psi after 10 minutes.
A fuel system that drops more than 5 psi in 10 minutes has a leak in one or more of the following areas:
o The fuel pump check valve
o The fuel pump flex pipe
o The valve or valve seat within the fuel pressure regulator
o The fuel injectors
o A fuel pipe
A fuel system that drops more than 2 psi in 10 minutes after being relieved to 10 psi indicates a leaking fuel pump check valve.o The fuel pump flex pipe
o The valve or valve seat within the fuel pressure regulator
o The fuel injectors
o A fuel pipe
If that all checks out start looking for a vacuum leak.
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Clogged cat. Do an exhaust system pressue check.
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12,953 Posts
agreed with burned. pull the o2, crank eng, does it rev past 1k. if it does than you have a bad/clogged cat.
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Ok, thanks guys ill try pulling the o2 sensor and see how it runs. If its still does the same thing ill rent the fuel pressure gauge again from auto zone. Thanks for the tips.
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I cut the cat off and i can now rev the motor up. It spits and spatters so im going to give it a tune up and hopefully be driving it soon. Thanks for all of your input. On a side note i can start putting all the Bravada cladding on it. Haven't seen a 2nd gen 2 door with the bravada cladding on one.
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85 Posts
Gave her a tune up and she runs like a champ. Thanks for all the help.
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