2000 Pontiac Grand Prix Car ran rough now won't even start

RIPPEDWHEELS4U

MEMBER
2000 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
100,000 MILES

My car out of nowhere started to shake really badly mostly while accelerating and the service engine light came on. I then tried starting it the next day and it died about second after starting it. I just replaced the fuel filter and fuel pump. I also smelled gas really bad after it started running rough. Please help

Monday, November 16th, 2009 AT 8:45 PM

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Scan the computer for code/s

Also check the following:

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.

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Monday, November 16th, 2009 AT 10:55 PM

RIPPEDWHEELS4U

MEMBER
1 POST

Scanned the car and found that cylinders 2 and 5 were missfiring. Replaced the coil (2 and 5 are on the same coil) and that did not work. Now they say it might be the ignition module. Ordered one today. Would the module cause a constant miss like that from just the two cylinders?

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Friday, November 20th, 2009 AT 11:39 PM

RASMATAZ

MECHANIC
75,992 POSTS

Could be compression or injector problem on those cylinders. Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

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Saturday, November 21st, 2009 AT 2:27 PM