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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Auto Service Tech
Category: Car
Satisfied Customers: 29428
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2002oldsmobile bravada p0300

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2002oldsmobile bravada p0300
Chat Conversation Started
GM Tech (Cam) :

WElcome. HAve you checked or changed the cap, rotor or the fuel filter? Any of these will cause a misfire

Customer:

no cap and rotor had fuel filter done 3000 miles ago

GM Tech (Cam) :

Sorry, 4.2 not 4.3. OK, does it seem to be on one cylinder or more than one?

Customer:

seems like posible more than 1

GM Tech (Cam) :

THese engines were very bad for leaking intake valves and seats. the fix is to replace the cylinder head. This is found by a cylinder leakage test. Anything more than 25% is too much.

GM Tech (Cam) :

Before going that far, make sure it is not the coil packs. Swap them around to see if the misfire changes cylinders.

Customer:

how do you test coil packs

GM Tech (Cam) :

Honestly, they are best to swap it to a differente cylinder and see if the misfire follows.

Customer:

ok any other possibiliteis u can think of cause this thing has drove me nuts for 3 days

GM Tech (Cam) :

There are a number of things, but these are the most common.

Customer:

ok thanks

GM Tech (Cam) :

My pleasure.

Customer:

can i get back with u tommorow after try moving coils

GM Tech (Cam) :

You can reply at any time to this post and I will respond as soon as I am able to, even after you accept.

Customer:

ok thanks

Customer:

ok thanks

GM Tech (Cam) and 4 other Car Specialists are ready to help you