Question about 2001 Pontiac Grand Am SE

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What makes my car backfire - 2001 Pontiac Grand Am SE

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Most likely out of time, worn timing parts, bad crankshaft sensor, bad cam sensor, bad spark plugs, wires etc

Posted on Oct 12, 2010

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Why does it run well, then backfire and stall?


make, model, year? backfires are spontaneous burning (exploding) of unburnt fuel outside of the combustion chamber. suspect bad spark plug/s, ignition coils, ignition timing, computer, leaking fuel injector, etc. scan for trouble codes, then post back. because the problem is intermittent, problem manifests only when hot (engine at operating temperature) do tests for both cold & hot conditions. test resistances (ohm) of suspected sensors: cam & crankshaft position sensors, ignition coils (if possible),(search the web for the recommended procedures). also test voltages at the computer (search the web for the pin outs of the computer of your car). also check associated relays (like for the fuel pump, etc.) a bad relay may have its coil open when heated, then becomes good again when cold. i suspect the car may have a good fuel delivery but the sparks are not coming in on demand, thus backfiring.

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1 Answer

# 2 cylinder plug wire was cut... All wires were replaced but car still backfires.... What else can cause this


What is the year, make, and model of your vehicle, as well as engine size? You say it backfires...is this as you try to start it? Does it backfire constantly, or intermittently?

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1 Answer

01 ford ranger backfires at higher rpm don't no


i was told that some rangers have a govner or sensor that won't allow you to go over 3,ooo rmp at a idle,it will make it run rough and backfire,it' to keep you from blowing up your motor

Apr 29, 2012 | 2001 Ford Ranger Regular Cab

1 Answer

What would make my 1999 Chevy Blazer 4x4 with a 4.3L Vortec engine suddenly start backfiring?


bad spark plugs, cam sensor or timing, or you could have clogged cat canverter

Oct 22, 2011 | 1999 Chevrolet Blazer

1 Answer

I have a p 1391 code on a 1999 jeep grand cherokee 4.7 liter v-8 engine. I just installed a Camshaft position sensor and also the ECM. I initially installed these two parts and started the vehicle up and...


you should check the crank position sensor . The plug may need to be tightened up or its pins bent a bit to make a better connection. Has any other work been done recently?

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1 Answer

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Mar 13, 2010 | 2001 Hyundai Accent

1 Answer

Backfire thru tailpipe


have you checked your spark plugs and distrubratercap make sure that all your plugs are calibrated to your mfg. spefications, it seems that you may have a little timing problem also

Jul 19, 2009 | 1993 Jeep Wrangler

1 Answer

Having rough idle and backfiring!


Still have a wire crossed somewhere. That is why you are getting the backfiring. Recheck firing order and make sure it is correct.

Jun 10, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Why does my 1998 gmc truck backfire and stutter sometimes stall when driving


I would suspect a burnt valve. An engine compression test will verify this.

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2 Answers

1992 pontiac starts, quietly dies and backfires loudly on restart


It sounds like to me you are having problems with your fuel injectors.  In situations like these there are soooooo many different variables and possible problems, but the fact that the car is backfiring makes me believe that you are getting too much fuel in because that is what makes are car backfire.  When fuel makes it to the cat converter or muffler it will burn there and cause the backfire.  My suggestion would be to start the process of elimination with a good fuel injector cleaner.  The only one that recommend is called Greased Lightening and can be purchased at Napa and O'Reilley auto parts.  If you don't have one of these near you I would go with Techron.  Let me know if I can help you with anything else.  Thanks for letting me help you with your problem and I would appreciate an honest rating on the help that I gave you.  Thanks for using FixYa!

May 20, 2009 | 1992 Pontiac Grand Am

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