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1991 Grand Am, Vin U firing order?


nikon101
06-07-2005, 06:19 PM
Hello All,
First message to the site - so I hope I'm doing this right.
I have a '91 pontiac Grand Am, 2.5, Vin U, 2 door, automatic.
I just changed the plugs & the firing order is different than that stated in the owners manual ( the glove box book). It was 1-4-3-2 from the old arrangement that I kept when I replaced the plugs. The book says 1-3-4-2. I set the wires to that arrangement - at the coil & the car wouldn't start
Anybody know which it should be? And, looking at the coil from under the car - which is the order of the coil tips? 1 at the bottom, running up to 4 at the top?
Thanks,
Paul

Ridenour
06-07-2005, 07:15 PM
Welcome to the forum. The quad 4 fires the 2 outer cylinders first, then the 2 inner ones. So the firing sequence would be the 1st one - 1 & 4, 3 & 2. I'm not sure about the coil tip order. Someone else will know.

nikon101
06-07-2005, 07:45 PM
Welcome to the forum. The quad 4 fires the 2 outer cylinders first, then the 2 inner ones. So the firing sequence would be the 1st one - 1 & 4, 3 & 2. I'm not sure about the coil tip order. Someone else will know.
Thanks so much for replying, I appreciate it.
Paul

skibum1111
06-07-2005, 08:20 PM
The firing order on the 2.5 is 1-3-4-2, and pin #1 on the distributor is to the right of the bottom pin. Hope it helps you.

Ridenour
06-07-2005, 08:22 PM
No problem Paul. There's a lot of quad four guys around here that should post up soon about the cap orders.

Knifeblade
06-07-2005, 10:50 PM
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/09/72/dc/0900823d800972dc.jsp

nikon101
06-08-2005, 01:05 AM
The firing order on the 2.5 is 1-3-4-2, and pin #1 on the distributor is to the right of the bottom pin. Hope it helps you.
Thanks a lot - this is a great forum!
Paul

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