Mechanics

PONTIAC GRAND AM BACKFIRE PROBLEM

1999 Pontiac Grand Am • 105,000 miles

How can I check timing without tearing front of motor apart?
AD
Avatar
Vicswife
January 4, 2012.



Which motor?

Roy

Its a 3.4

Tiny
Vicswife
Jan 4, 2012.
You could remove number 1 plug and move the piston to top dead center.
Then remove the valve cover to verify the valves for that cylinder are both closed.
Before going there, what is the problem you have?

Roy

I have #6 intake full of gas
AD

Tiny
Vicswife
Jan 4, 2012.
Ok, you may have a stuck injector that may need to be replaced. I would check this first before going any further with the timing.

Roy

Ok, Im going to take my husbands place on here for a moment. Long story short, my car had a bent valve. ( He didnt check the timing before putting the heads on) He put remanufactured heads on. Put everything back together. And the car would turn over, but not start. We would get a backfire from the intake. Thats what propmted him to ask about the timing.

Tiny
Vicswife
Jan 4, 2012.
There are different size push rods and if they are put in wrong, it will bend a valve. You need a compression test on that cylinder to verify that it has the ability to work.

Roy


AD