jessep28

Two questions:

1) My 00' GT, 53k will once every blue moon right at startup act like its misfiring for a few seconds and then idle funny until I start driving. Then it runs just fine.

I just had the plugs and wires replaced (not Bosch), so I don't think its related to that. Could it be the IAC valve, MAF related? Fuel pressure?

It happens like once a month if that, so I am not too worried.

2) I just put new tires on the car with a higher speed rating - T vs. the S Goodyears that were on there originally. I'm keeping it to the pressure as stated on the trunk (30psi). Is that the proper pressure?

Thanks in advance.

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00' Pontiac Grand Prix GT
83,500 mi

GTP Dad

Regarding your misfire, check the area where the wires connect to the coils and add a little dielectric grease, you may be getting some moisture in the boots and until it burns out is causing the misfire. Second, add some fuel injector cleaner, possibly a dirty injector. Finally, clean the mass airflow sensor. It can sometimes cause a misfire especially on start-up. Us electronics cleaner and don't touch the wires.

BNaylor

What brand of spark plugs and wires were installed?

Also, it is always a good idea to get fuel system pressure tested to make sure it in in spec. at 48 - 55 psi.

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'08 Pontiac Grand Prix GXP - LS4 5.3L V8
'02 Oldsmobile Alero GL2 - LA1 3400 V6
'01 Buick Regal GS - L67 Series II 3800 V6 Supercharged
'99 Buick Regal LS - L36 Series II 3800 V6
'03 Honda CR250R MX - 2 Stroke 250cc
'97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged
Timeslip 08/12/06

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theblurr87

thats just you're car having it's period. I hear if this doesnt happen 9 months later a piston shoots out your tailpipe. haha

tires should be good at that psi.. i have crappy tires but i usually run 32 all around

is it throwing any codes when you say it misfires? otherwise just do what the Dad said.

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'99 SE (l36) 125k mi.
FWI | ZZP HVTB St. 1 | WP UD Pulley | 3" DP/HF Cat/U-bend Del.

richtazz

Funny stuff!

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Would you drive any better with that cell phone up your ...?!

isra2003

Also you might want to check that all spark plugs have the right gap...my car had the same symptoms and it was because a plug was off by.012...