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Firing order on a 3.4L V6


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#1 pandorazboxx

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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?

#2 98firebird

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Posted 30 January 2013 - 12:00 PM

Hayne's manuals are not as reliable as Service Manuals directly from GM. Your engine is no different from any other 3.4l.
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#3 GaryDoug

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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).

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1998 Trans Am - LS1/A4 - all stock and almost all original - one owner - driven daily

#4 pandorazboxx

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Posted 30 January 2013 - 12:42 PM

hmm, I'll double check the wires at the plugs. I mean I traced them back to the cylinders. Maybe i have a bad coil or something.

#5 pandorazboxx

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Posted 30 January 2013 - 01:26 PM

OK, I actually had it wired up right. Either the Hayne's manual had a typo or I was just out of it after working on the car all day yesterday. Posted Image




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