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Ideas please Posted By: sickynar9 On: 08-01-2008 @ 15:52:18 Reply | Edit So my car develped a misfire out of nowhere about a month ago. I figured plugs again, changed them and no difference. So i replaced the O2 sensors and fuel filter and fuel pump. Nothing helped so i took it to a dealership. They work on alot of C4 vettes so i figured they would know. They told me optispark was bad so they replaced it. That didn't help so they replaced the ignition control modual. Same deal, they replace pretty much every part of the ignition and nothing helped. They discovered that it only did it under 2400 RPM. So they replaced the computer thinking that was the problem. So after 2 weeks of waiting for the computer it still does it. They deleted my tune and have had my car for three weeks and still have no idea what is causing this. So if anybody has any ideas it would be greatly apprieciated. 97 Trans Am WS6 74,000 miles M6 pacesetter longtubes with true duals and no cats was tuned by PCMforless Posted By: useful_idi0t On: 08-01-2008 @ 17:45:16 Reply | Top | Edit have you checked for broken wires and other components like the plug wires, coil, and maf? edit: what plugs are you using and what are they gapped at? --  96 WS6 T/A A4[Hooker Shorty's][Hooker Catback][K&N Drop In][Spohn Front and Rear Sway bars w/ poly bushing][LT1 Scanmaster][UMI Sub Frame Connectors][J&M Tubular LCA's][UMI Strut Tower Brace][HSW Wet kit w/ 75shot jets][FJO Controller][FPSS] [ Edited on 08/01/2008 @ 17:46:48 ] Posted By: sickynar9 On: 08-01-2008 @ 19:41:33 Reply | Top | Edit the mechanic and i both checked the wires, they replaced the coil, and im not sure about the maf i was running Platinum 4's and now i switched to some cheap autolite 2$ ones from napa. Posted By: 94fireturd On: 08-03-2008 @ 00:05:38 Reply | Top | Edit Take it to another shop? -- 
94 Formula: sold 00 WS6: sold 1993 Z28: CIA, Hooker LT's, Mufflex Y,!EGR!AIR!CATS Posted By: Calaban007 
On:
08-03-2008 @ 00:17:45 Reply | Top | Edit
First, if you haven't changed the wires do that. I recommend Jegs branded wires. They are 41 bucks a set shipped. I've been running them on my IROC and Z28 for a while. Very good wires, I say that because you've spent so much cash already what's 50 more bucks. Check your fuel pressure. Make sure all your injectors are working properly. Wait until dark and park in a very dark spot. With the car idling open the hood and look for arcs from the wires to the engine or anywhere else for that matter. Good Luck. -- 
1995 Camaro Z28, M6, T-Top Conversion & 1989 IROC-Z Stock restoration in progress, well almost stock 
http://www.myspace.com/163296073 Posted By: 95ttoplt1
On:
08-03-2008 @ 01:40:25 Reply | Top | Edit
Gotta leave the dealership, just start replacing shit with out diagnopsing anything. Don't worry the customer will pay for all of it. I would pay for a single fucking part they put on the car, none of it was bad or the problem. Take it to a real shop and have it looked at. --  Posted By: Green97TAMachine On: 08-03-2008 @ 08:04:12 Reply | Top | Edit Put new plugs and wires on it. I had the exact same thing happen about a year ago and I changed the plugs/wires and I haven't had any problems since. Turns out that even though the wires ohm'd out ok, two of them were still bad and I'd get a miss from idle to 2500rpm's. I just went with the NGK V-Power (TR5's I believe) plugs and the cheapo advance auto brand wires. Problem was solved. -- 
1997 Mystic Teal Trans Am, M6, Leather, Hardtop. TB Bypass, CAI, Open Pacesetter LT's !CATS, !AIR/E.G.R., !CAGS, PCM by Thunder Racing. Posted By: sickynar9 On: 08-04-2008 @ 18:42:05 Reply | Top | Edit Well i called my mechanic and he doesn't think that its the wires. But i suggested that he just switch two of the wires around and see if the misfire switches cylinders accordingly. So he said he'd do it tomorrow morning and see what happens. Thanks guys ill let you know if it fixes it. Posted By: x91z28x On: 08-04-2008 @ 19:35:22 Reply | Top | Edit i agree with 95..don't pay for a thing the dealership did..they are responsible for throwing parts at it..not you -- Any chevy can be an SS. Only a Camaro can be a Z28 Posted By: sickynar9 On: 08-05-2008 @ 01:08:58 Reply | Top | Edit Yeah but they are the only chevy dealership here and i dont want to piss them off incase i need other work done....i have no problem paying for parts....its the 30 hours of labor i dont want to get charged for....especially since i was the one who told them how to fix it. Posted By: sickynar9 On: 08-07-2008 @ 12:59:51 Reply | Top | Edit Well the mechanic looked at the plug wire on the cylinder that was misfiring and it was all cracked to shit. Seems to me that should have been one of the first things to check. But i ordered some new wires and we'll see how much they try and charge me when the service manager gets back. Posted By: zstr28 On: 08-07-2008 @ 14:55:33 Reply | Top | Edit Does your car miss at an idle or under load? I'm having a similar problem on my 95. If I try to accelerate with a load under 2500rpms it misses real bad and even back-fires. I have a new opti, coil, ICM, PCM, My wires are newer however questionalbe. -- 95 Z28, A-4, K&N intake, TF elbow, polished 52mm Edelbrock,free mods, gutted cat, Magnaflow catback, LT4 roller timing set, A/C AIR & EGR del. Meziere EWP, Hypertech prog, 160 stat, Hyp Tech coil, New GM transmission, rebuilt posi 2:73's. 97 Z28 convertable, A-4, fully loaded,bone stock.  
Posted By: sickynar9 On: 08-07-2008 @ 19:19:09 Reply | Top | Edit My car misses really bad until about 2400 Rpm then just stops until about redline. Never at idle and if i didn't bog the motor is would be fine thats why the dealership couldnt figure it out. Spark plug wires are cheap so i would try that.
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