1996 Pontiac Firebird acclerator sputter

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Engine Mechanical problem
1996 Pontiac Firebird 6 cyl Two Wheel Drive Manual 120000 miles

Upon heavy acceleration the engine will start to sputter. I've changed my fuel filter and ran 2 bottles of Lucas injector cleaner through 2 tanks of gas and no luck. Any ideas?

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have the same problem?
Tuesday, February 16th, 2010 AT 4:41 PM

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That injector cleaner is "Snake Oil" in a bottle. It doesn't work, other than to line the pockets of Lucas with your hard earned dollars. (Manufactures warn against these products because they can actually cause your injectors to leak)

As for your hesitation on acceleration. This doesn't necessarily have to be fuel related. You could be experiencing an ignition misfire. (Which you should check before the fuel system)

Does your "check engine" light come on? If so, you should have your computer scanned. The codes will point you in the right direction. And you could have a "Drive test" performed. A qualified mechanic can hook up a scanner and monitor your engine's systems live and interpret the data.

Also, when was your last tune-up? If it's been awhile, change the plugs/wires/cap/rotors. Then if no change, test the ignition module with a tester.

If you can eliminate the ignition system as the source of your problems, then it's time to check the fuel system.

Begin with system pressure, both with "Key on/Engine off", then with "Engine on". Compare your readings to spec. If your fuel pump/fuel pressure regulator are doing their jobs, then perform a cylinder drop/balance test. (Disabling each injector one at a time) This will tell you if one/more of your injectors are bad.

If your ignition/fuel systems both check out, then you'll have to begin checking your computer controls and sensors. You could have anything from a bad MAF, to a intermittent crank/cam sensor failure.

If you need help with any of these diagnostic procedures, don't hesitate to ask. Good luck.

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Monday, February 22nd, 2010 AT 10:18 PM

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