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Firing order on a 3.4L V6
Posted 30 January 2013 - 10:11 AM
Hey guys, just did some work on the firebird and replaced the power steering pump and the timing cover gaskets (what a pain!). I was putting it back together and ran into a little issue with the firing order. I know the engine cylinders are 135 on the pass side and 2 4 6 on the driver side (from front to back). On the coil packs from left to right the Hayne's manual tells me 146325. but when I took it apart I thought 4 and 6 were switched. Well I put them back together the way the Hayne's manual said and the engine sounded like crap. i switched it back to the order i thought it was in before (164325). Is it possible that the Hayne's manual has a typo or is my car just special? Anyone else have this issue?
Posted 30 January 2013 - 12:28 PM
Here is part of a page from the free 94 OEM service manual. You can get the full set by using a link in a topic at the top of the 4th Gen section here. It agrees with your manual. I suspect that you may have the #4 and #6 wires swapped at the plugs. The plugs fire together in pairs : 1 and 4, 6 and 3, 2 and 5. It does not really matter if you swap the wires of the same pair (example 1<--->4), but it would make a big difference if you swap two of different pairs (4<--->6).
94-SvcMan-Vol2 diagnosis 3.4L coils wiring.png (42.54K)
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1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily
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