Hope someone can help me out here. My car just registered a code P0300 which
my scan tool registered:
"Random Multiple Cylinder Misfire Detected"
The car had done this before about 2 months back then stopped doing it. What
it did was like stutter when I start the car.
Sometimes the problem would last a while then dissapear for a long time but
it happened again today. And this is after the car had already been driven
about 12 over miles so engine was still quite warm. Just went into Costco
bought a few items and about half an hour tried starting my car and in idle
mode it kinda stuttered or sputtered but the engine did not die out though
it sure seemed like it was going to.
Now before I take it to the mechanic I would like to know what you guys
think. The car is a 96' V6 3.8LT Automatic. Last tune up was done around
May of 2003 and I had the plugs and filters changed. Even had an Induction
Service done. Can it be time for another Tune Up or what else could be the
I just don't want to get burned by the mechanic.
Thank you for any response.
What it sounds like to me:
Is a hot soak problem, where excess fuel is in the intake manifold when you
are going to start it up. The fuel pressure regulator diafram being ruptured
or a leaking injector would be a good place to start looking.
It's an easy test also, put on a fuel pressure gauge, cycle on the key a few
times. With a 15 second rest between cycles, to pressurize the fuel system
to the maximum.
Any leakage of more than one or two pounds in an hour or two. You found the
This is a seat of the pants diagnosis: Do not rip off a technician's head
like this is a gospel diagnosis!
It's not time for a tune up but you have to ckeck the computer and the mechanic
can tell more my car did the same and I had to take it in it had to do with the
computer when a code comes up the computer does not forget it so take it in and
then they can tell you exactly what it was mine was just a broken plug wire. But
you can check the wires and the plugs but I would take it in.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.