pcv?

graphicassult · #1 12-10-2005, 05:19 PM

okay, theres only been a few threads about this with no real answer

I have the pulsing or surging when i acclerate and plan to replace the pcv valve

but then today i could feel the car wasnt running to par, so i stomped on it on the highway and then my service engine soon light came on.

Will the pcv cause a light to come on? if so then i'm not as worried but if its something else then that will be bad.

I also have a rear main oil leak but i know that wouldnt cause a service light to come on.

ANY INSIGHT WILL BE NICE! thanks guys

GTP Dad · #2 12-10-2005, 06:17 PM

It is doubtful but not impossible for the PCV valve to cause the CEL to come on. I would get the computer scanned to get the actual code. The current issue could be anything from a bad O2 sensor to a problem with an engine misfire. Once you get the computer scanned post the codes and someone will help you with the repair. Autozone scans for free.

graphicassult · #3 12-10-2005, 10:29 PM

I planned on going to Autozone tomorrow, hopefully its a cheap fix!

graphicassult · #4 12-11-2005, 12:19 AM

okay, so tonight i was out waiting for my girlfriend and saw some slight smoke coming up from the drivers side tail pipe.

Not to sure if it truly was smoke because its so cold out and it had only been runnin for awhile.

And on start up it shakes

And at highway speeds 55-85 it pulses and my cel flashes

BNaylor · #5 12-11-2005, 12:30 AM

Quote:

Originally Posted by graphicassult

okay, so tonight i was out waiting for my girlfriend and saw some slight smoke coming up from the drivers side tail pipe.

Not to sure if it truly was smoke because its so cold out and it had only been runnin for awhile.

And on start up it shakes

And at highway speeds 55-85 it pulses and my cel flashes

It would be helpful if you could tell us what model Grand Prix you have to include engine and mileage. When the SES light flashes it indicates a misfire condition.

vamc · #6 12-11-2005, 01:01 AM

bnaylor3400- how it going. I think it could be an o2 sencer, but like you said, we need a little more info.

graphicassult · #7 12-11-2005, 02:33 PM

havent gotten it checked out yet. A little hungover...

But its a 99 GT 3.8 V-6
108,456 miles

vamc · #8 12-11-2005, 06:51 PM

lol

graphicassult · #9 12-11-2005, 09:07 PM

so if the light blinks then stays on then could it be a misfire?

It does feel like its rough and even idling the tach fluxuates...

It has new spark plugs about 1000 miles ago, i didnt change the wires though....

BNaylor · #10 12-12-2005, 09:57 AM

Quote:

Originally Posted by graphicassult

so if the light blinks then stays on then could it be a misfire?

It does feel like its rough and even idling the tach fluxuates...

It has new spark plugs about 1000 miles ago, i didnt change the wires though....

If the SES light stays on then as suggested get it scanned. You'll be looking for P030X misfire codes on the reader. Last digit of the error code will tell you which cylinder(s) is acting up.

Since you have over 100K miles, I would say that the spark plug wires is the best starting point for a misfire. However, stay with the OEM AC Delco 7mm premium silicone wires.

graphicassult · #11 12-12-2005, 11:10 AM

yea, definetly believe its a missfire. This morning when warming up you could hear the engine missing, i dont think it will be a fouled plug i have the acdelco iridiums.

So i'm guessing wires or even one of the 3 DIS modules.

GTP Dad · #12 12-12-2005, 02:05 PM

You are probably correct in assuming that it is a misfire, I would get it scanned anyway as it will point you in the direction you need to go. If it is a single plug or multiple misfires. The approach is the same but the solution may be different.

graphicassult · #13 12-12-2005, 02:57 PM

Okay, so i'm at my automotive class looking at alldata and have all the testing information, once i get it scanned i'll update and then hopefully get a fix.

Thanks everyone who helped out

vamc · #14 12-12-2005, 08:02 PM

Sounds good.

graphicassult · #15 12-13-2005, 12:38 AM

Freakin Auto Zone

So i have NO Time between school and work, so i go in at 8 and the Auto Zone dumbasses go "I ONLY HAVE 2 PEOPLE SO WE CANT DO IT!"

There was no one even in the parking lot...

But on my way to the zone my car was shaking really bad when idling, and i've noticed a smokey mix coming from the tailpipe, its not really smoke but theres always a constant moisture cloud.

So i've kinda narrowed it down, its either (hopefully) a bad spark plug, the wires, or even a coil. And possibly an injector? oh well, updates soon

Getting it scanned tomorrow!

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