99 SS I need help bad
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Teching In
Joined: Jul 2012
Posts: 4
Likes: 0
99 SS I need help bad Guys I could really use some help. I've got a 99 SS I'm working on for some ppl, they installed a new m6 trans and some off brand longtube headers that look like they are made really good. when they brought me the car it was backfiring like crazy more at idle and when I reved real fast, so I figured it needed a tune but they wanted a new cam and springs installed and the egr delete and all that stuff before I tuned it. after I get all that done and load the the tune with hptuners that I had from my dyno tune that had the same specs all but the header brand and it still backfires, it shows no codes I've changed all the sensors twice checked all the grounds,pink wires, intake leaks, exhaust leaks, moved coil packs,plugs and wires, fuel pressure, timing, new fuel about anything you can read about on any forum I've tried and nothing helps the funny thing is if I unplug the driver side coil harness it stops backfiring and doesn't change the way it's running but unplug the pside and it pops a few times and dies Dside header runs much cooler then Pside after ten mins of idling you can touch the Dside still I'm down to thinking the computer is junk but it runs perfect and has good power anybody have more ideas cause I'm lost.
Teching In
Joined: Jul 2012
Posts: 14
Likes: 0
From: Pearland, TX
the funny thing is if I unplug the driver side coil harness it stops backfiring and doesn't change the way it's running but unplug the pside and it pops a few times and dies Dside header runs much cooler then Pside after ten mins of idling you can touch the Dside still.
You can touch the entire header? Or just one runner??? Are they ceramic coated? Also you can unplug the driver side coils??
You got something weird going on there bud Trending Topics
Sounds like you not firing on all 8. Sounds like the driver side harness.
By chance could you have flipped the coil pack harness?
I would try flipping the driver side harness and try again.
By chance could you have flipped the coil pack harness?
I would try flipping the driver side harness and try again.
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Swapped the harness around and engine ran great ! At least give it a look, could be a simple solution especially if you had the harness unplugged from the coils.