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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / November 2006

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Help with Hesitation and Misfire Diagnosis

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Aaron407 - 18 Nov 2006 04:08 GMT
Hey everyone,

I have a 95 Grand Prix GTP with a 3.4L DOHC, 248000km's. Lately (well,
for a couple months now) I've been having a significant (and quite
regular) hesitation upon initial acceleration when the engine is both
cold or warm, and when at a stop, in drive, with my foot on the brake,
I'm getting intermittent misfires. I've changed the EGR valve and PCV
valve, as well as my plugs without any change. I do not have my SES
light coming on or any error codes stored, and the throttle position
sensor and oxygen sensor(s) are working properly according to the code
reader. Now I'm guessing that it's either my wires, coil pack, or
ignition module, but could someone help shed some light on my problem?

Any ideas? And please take it easy on me, I'm just beginning to build
my automotive knowledgebase.

Thanks.

-407
dbkcrazyk@yahoo.com - 19 Nov 2006 17:21 GMT
> Hey everyone,
>
[quoted text clipped - 15 lines]
>
> -407
dbkcrazyk@yahoo.com - 19 Nov 2006 17:26 GMT
> Hey everyone,
>
[quoted text clipped - 15 lines]
>
> -407
sounds to me like plug wires or a dirty maf sensor. most likely plug
wires, but it never hurts to clean the maf sensor.
Aaron407 - 19 Nov 2006 18:17 GMT
You were right on the money. After pulling out some rubber spacers that
were around the spark plug boot, I found arcing coming through the
boot, even though there wasn't a visible hole. I changed the plug wire
and it runs beautifully now without any of the misfires or hesitations.

Thanks!

-407
 
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