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Old 10-04-2012, 04:14 PM   #1
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Join Date: Oct 2004
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Location: Colchester CT
What I Drive: 03 zx3 D23 stick

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Need help, been to dealer 3 times *Bucking missfire?*

OK guys, Ive been to the dealer 3 times now with my wifes 05 zx3 atx. It had a steeda intake, borla 2.5 catback and a 93 oct tune from FS. I have since put the stock program back on.
My problem is that under a high load / low rpm condition such as acellerating up a hill at 40-45mph in the highest gear, the car will buck and the tach will jump up and down 100-200rpms like rapid fire. Sounds like a machine gun when its really bad. It does happen in other gears/situations, just not as oftin. And it either drives fine for hours, or it will drive like crap all day. its random.

-first time at the dealer they said, "Thats because your tires are really worn down, you need to buy 4 tires." granted I do need tires, but I think they couldent replicate the problem and wanted to make a buck somewhere. They also said that the upgraded tranny program might help, cost me $200...

-Second time they went for a test drive with me, I got it to barely replicate with the tech and he instantly nailed it, "ignition missfire caused by... who knows what." Thats what I thought originally and I think its obviously that. He hooked it up to his machines and saw a misfire. checked the voltage at the coils, new plugs, tranny flush and a few other things that dident help, cost me $700 more...

-now they say they cant get it to replicate and everything is checking out perfect. going to try driving it again with equipment hooked up in the am. who knows what this one will cost, they have spent "several hours on it"...

What should I do? What should they check? It dosent happen all the time so I know its hard for them to pinpoint it, but a few more trips and I could have bought a new engine! I have my xcall II, can/how do I data log when its acting up so that I can show them? I apprecate if anyone actually read through all of that and im open to suggestions!

2.5 all stainless Borla cat-back, Steeda sri, Focussport excall II 93oct tune----05 zx3 ATX

3" SS Trubendz w/HFC Flex back, Cossie BSD, de-badged----03 zx3 2.3 MTX
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