Backing firing from 2500 rpm up - Muscular Mustangs
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post #1 of 5 Old 01-27-2006, 05:10 PM
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Backing firing from 2500 rpm up

I have a problem that I cannot seem to figure out, my mustang backfires from 2000 rpm on up. When started cold it will idle fairly smooth with occasional backfire if you thump the gas the car just shuts off. Once warm it runs smooth until about 2000 rpm and then it is like someone kicked on a rev limiter. It will climb in power while backfiring bad then seems like two to three cylinders die then come back on. When cruising down the road at operating temperature I have had the car just turn off. I try to restart and it cranks like there is no gas, I wait about 30 45 minutes go back out and it will start fine like it never happened before. This is driving me crazy here are the stats if anyone could help.

1992 185,000
GT40 intake upper lower
BBK 65 mm throttle body
Pro M 75 Maf for 19lb injectors
Equal length shorty 1 5/8
H-Pipe, dumps before axle
Black magic flex fan
180 thermastat
16 degrees timing runs even worse around 12 like too rich

Replaced Items
130 Amp alternator
Accel Coil
Ignition Module
Battery Cables
Starter
Starter relay
Cap Rotor wires plugs found the old one somewhat melted some how
Fuel Filter still running the stock fuel pump
Fuel pressure gauge on fuel rail reads 35 psi off and 32 psi when running jumps to 40 psi then back to 32 psi when revving motor.

HELP thanks
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post #2 of 5 Old 01-27-2006, 11:17 PM
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I've had both a coil and MAF meter give me similar problems. Have you tried checking for computer codes?



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post #3 of 5 Old 01-28-2006, 10:15 AM
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Back Firing

I have not check for codes as of yet, I did what I have read about in this article and cleaned the little wire on the maff meter and it seemed to help a lot...I guess I probably should run up to Autozone and see if they can test it.
 
post #4 of 5 Old 01-29-2006, 09:59 PM
 
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Re: Back Firing

Quote:
Originally Posted by racing_stang
I have not check for codes as of yet, I did what I have read about in this article and cleaned the little wire on the maff meter and it seemed to help a lot...I guess I probably should run up to Autozone and see if they can test it.
You don't have to take it to Autozone....you can DIY, simply follow the procedure right here in MuscularMustangs.com. You'll save some bucks too. GL
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post #5 of 5 Old 03-08-2006, 06:39 PM
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loss of power

do you also loose power as the rpms go up?

I had a bad cat that would cause the car to backfire and run like it was running on 4 cylinders instead of 8
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