Problem with my 2005 Pontiac Grand Prix V6
3800 V6
dash lights = SES check engine light
GM Computer codes = P0300 misfire
Repairs done prior = Nothing done before. Just been getting worse over the
last few weeks.
Tune up, spark plugs, wires.
tip/donation yes
GM tech = jk
question = My 2005 Pontiac Grand Prix has a check engine light on. It also hesitates a little bit. Had
the codes scanned and came back with P0300 misfire intermittent on a few different cylinders. We
did a tune up but did not seem to help. What can i do so i dont have to take it to a shop, thanks.
JK:
If the spark plugs and wires did not help, there is a PCM (Powertrain Control Module) programming
update that may fix your problem.
This update corrects random misfires road speed when the TCC is engaged.
Expect to pay 1 hour labor charge at the dealer for this fix.
3800 V6
dash lights = SES check engine light
GM Computer codes = P0300 misfire
Repairs done prior = Nothing done before. Just been getting worse over the
last few weeks.
Tune up, spark plugs, wires.
tip/donation yes
GM tech = jk
question = My 2005 Pontiac Grand Prix has a check engine light on. It also hesitates a little bit. Had
the codes scanned and came back with P0300 misfire intermittent on a few different cylinders. We
did a tune up but did not seem to help. What can i do so i dont have to take it to a shop, thanks.
JK:
If the spark plugs and wires did not help, there is a PCM (Powertrain Control Module) programming
update that may fix your problem.
This update corrects random misfires road speed when the TCC is engaged.
Expect to pay 1 hour labor charge at the dealer for this fix.
The Powertrain Control Module (PCM) is the control center of the vehicle. It controls
the following items:
• The fuel metering system
• The transaxle/transmission shifting
• The ignition timing
• The on-board diagnostics for powertrain functions
It constantly looks at the information from various sensors, and controls the systems
that affect vehicle performance. The PCM also performs the diagnostic function of the
system. It can recognize operational problems, alert the driver through the MIL, and
store diagnostic trouble codes which identify the problem areas to aid the technician in
making repairs.
the following items:
• The fuel metering system
• The transaxle/transmission shifting
• The ignition timing
• The on-board diagnostics for powertrain functions
It constantly looks at the information from various sensors, and controls the systems
that affect vehicle performance. The PCM also performs the diagnostic function of the
system. It can recognize operational problems, alert the driver through the MIL, and
store diagnostic trouble codes which identify the problem areas to aid the technician in
making repairs.
Tune up, Spark Plugs and Wires - Still SES Light
1999 Grand Prix 3.1 lt V6. Misfire on cylinder 3
Have replaced the flywheel once already.
Question = why would my flywheel on my 99 grand prix keep breaking around the bolt holes where it bolts to the
engine. Has broke 2 times now.I replaced the first one myself by the book. All bolts torqued. 2nd broke in less
than 200 miles. Breaks while driving down the road 55/60 mph. Car has not been mistreated and shows no
other problems. Please help.
Have replaced the flywheel once already.
Question = why would my flywheel on my 99 grand prix keep breaking around the bolt holes where it bolts to the
engine. Has broke 2 times now.I replaced the first one myself by the book. All bolts torqued. 2nd broke in less
than 200 miles. Breaks while driving down the road 55/60 mph. Car has not been mistreated and shows no
other problems. Please help.
Answer: There should be no reason that it
keeps breaking. The only reasons that the
flywheel usually breaks is due to stress to it,
rusting, or over tightening/wrong attaching
bolts. If it's the teeth that keep breaking, I'd
look at replacing the starter because it is
engaging to far or to hard onto the flywheel.
If it is cracking in the center, then try new
flywheel bolts and be absolutely sure that
you're torquing them to specs.
keeps breaking. The only reasons that the
flywheel usually breaks is due to stress to it,
rusting, or over tightening/wrong attaching
bolts. If it's the teeth that keep breaking, I'd
look at replacing the starter because it is
engaging to far or to hard onto the flywheel.
If it is cracking in the center, then try new
flywheel bolts and be absolutely sure that
you're torquing them to specs.
