fuel shut off problem - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 9 (permalink) Old Jan 12th, 03, 01:33 PM Thread Starter
 
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I have a 1999 Camaro with a 3.8 V-6. I just installed a NOS system in it plus a new computer. I want to get rid of the fuel shut off. I don't know if it's by the computer or if i can bypass a wire. When i shift into 4th gear it shuts off at 120 mphs. Please help me get rid of this problem. Thanks, Travis
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post #2 of 9 (permalink) Old Jan 12th, 03, 02:22 PM
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I think that they are controled thru the computor you may need to have it reprogramed. Anyone one else?
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post #3 of 9 (permalink) Old Jan 12th, 03, 10:29 PM
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It's a computer issue. You can thank the insurance companies for that.

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post #4 of 9 (permalink) Old Jan 13th, 03, 02:09 AM
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Sounds like the rev limiter is doing what it is suppose to do in the PCM. I'd say you could program it with a B4C (police camaro) Vin # because they ran up to 159 mph but you have a six cylinder so that won't work.
I've used the Hypertech programmer and that works good but I'm not sure if they have one for a six cylinder. Try this link:
http://www.hypertech-inc.com/prodmenu.html

Drew
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post #5 of 9 (permalink) Old Jan 13th, 03, 04:04 AM
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Its a computer program issue, but......What about getting a fuel pump wiring diagram and wire directly from ign to the fuel pump?

The fuel pump relay has 12 volts on one side, and the PCM puts a low on the other side of the relay coil, thus energizing the relay and pumps fuel. When speed limit is reached, PCM turns off the low, relay deenergizies, fuel pump turns off.

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post #6 of 9 (permalink) Old Jan 13th, 03, 04:34 AM
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I don't believe this is a fuel pump issue. The fuel pump isn't shut off at a predetermined speed/rpm. On a 99' the rev limiter (internally programed in the PCM) shuts the fuel injectors off momentarily to reduce engine RPM's.
Drew

[This message has been edited by drew69 (edited 01-13-2003).]
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post #7 of 9 (permalink) Old Jan 13th, 03, 08:06 AM
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The speed is set to match your tires. Over ride it and let us know how long your tires last before they explode from heat generated!

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post #8 of 9 (permalink) Old Jan 13th, 03, 08:10 AM
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Okay, Drew, my mistake, -10 points in lab....

Then if PCM does cut off injectors, then a re-program is needed. Or a 2:1 gear box needed for the vehicle speed sensor?

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post #9 of 9 (permalink) Old Jan 13th, 03, 09:50 AM
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Well you guys made me dig up the Hypertech manual that came with the programmer on a car I set up with it. I changed a 95' Caprice with an LT1 engine. Took out 308 gears and installed 342's, changed tire size to 225/60R 16, installed headers, dynomax dual exhaust, bigger throttle body, performance MAF sensor, bigger injectors, K & N air filter, changed coil spring rate and dropped ride height, and whatever else I don't recall.

Milan is correct on max speed is set for tire speed rating. This can be changed with the programmer.

Here's what else you could do.
Power Tuning - optimized engine spark and fuel tuning based on a 160* Powerstat (thermostat) and premium grade fuel, 93 octane or the highest available in your area.

The engine RPM limiter is increased to 6,000 rpms for the 4.3/5.0/5.7 (auto or manual trans.) 5500 rpm for the 7.4 (manual only)

Change automatic transmission shift points.

Change automatic transmission shift firmness.

Change axle ratio. (automaticaly corrects speedometer and shift points for auto trans.)

Change tire size by 1/4" increments (also corrects speedometer and shift points).

I had good luck with it but had to play around with the power tuning. You can also customize the power tuning and select only certain changes. It made a big difference over stock on the application I did.

Just to add, anybody working on the new cars with the "tire inflation monitors" ? Something else to deal with when you start playing with tire sizes. Chassis module calculates tire diameter I guess from the ABS sensor is the way they are doing it on the Impalas anyway then it sets off a light on the instrument panel if one tire looses 12 psi air pressure over the other three.

Good Luck, Drew


[This message has been edited by drew69 (edited 01-13-2003).]
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