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1979-2004 V6 Mustang Tech Discussions

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Unread 11-16-2012   #1 (permalink)
M3chi3 is offline Apprentice


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Default Bad gas?

Hello, i had my fuel pump replaced about 2 weeks ago and my car ran great until today. I got gas yesterday and didn't have any problems, although i didn't go anywhere afterwards. Today i drove for 30 minutes or so and it stalls a little bit and the rpm's go up! Does this sound like i may have gotten bad gas? I do go to that store all the time and never had any problems. If not, could it be my pcm? A few months ago Precision Tune did diagnostics on my car and said my pcm was going bad but after taking it to Ford, they said it was the fuel pump.

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Unread 11-16-2012   #2 (permalink)
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I just drove it for a while longer and it really doesn't feel like a gas problem. It seems like the fuel cuts out for a second or so and the engine revs when it does that. I had a 1994 Probe that did the same thing and it turned out to be a bad relay. The bad thing is, i don't remember the name of that particular relay. I'd appreciate any help!

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2004 40th anniversary GT convertible

3'5 Magnaflow exhaust tips, Upper n lower rear decklid panels, Flowmaster 40's,
4.10s, Sct tuner, mach 1 grill delete, AM Whiteface guages, chrome cobra wheels, Nittos 275 40r 17 front/315 35r 17 rear
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Unread 11-17-2012   #3 (permalink)
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Do you have your CATS off your exhaust? If so then your Tang might be starving for fuel. Which means you'll need to install an adjustable fuel regulator. If you have the CATS still on then your CATS might be clogged up and need replacing.
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Unread 11-17-2012   #4 (permalink)
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no, lack of cats wont 'starve you of fuel'. the air fuel ratio sensing oxygen sensors are before the cats anyway. nothing would change except the exhaust's restriction.
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Unread 11-17-2012   #5 (permalink)
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If PCM relay was bad the car wouldn't consistently turnover on start.


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Unread 11-18-2012   #6 (permalink)
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With my 94 V6, lack of CATS will lower fuel pressure. Trust me I had to experience that first hand. Not all Mustangs will lack fuel pressure when CATS are cut, but with mine I had to adjust the fuel pressure. Don't know about the PCM. Might be the problem. That's the thing with cars, when you think it is something major it is something minor.
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