Misfire turned into car running like absolute crap, what happened?
09-02-2010, 08:51 PM
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Misfire turned into car running like absolute crap, what happened? As title says I have been troubleshooting a misfire this weekend. First off, I was getting O2 codes from no cats, so I took my car to the tuner to have them delete the codes, and right away they noticed a misfire (I couldn't tell it was there, but that's all they do is LSx's) they replaced a plug and a wire and sent me on my way. Now I am paranoid and went ahead and bought all new spark plugs (NGK TR6) and new wires (Summit 8.5 mm). Replaced them and pulled the valve covers to see if anything was bad. Everything appeared ok, so I put everything together and took it out for a spin.....It ran like crap.... Under moderate acceleration it would make a deep exhaust note, as if all cyls weren't firing and lacked power. I never gave it any more than moderate throttle for fear it would be bad.
Car is 04Z with 30k miles, full exhaust, kenne bell boost a pump, 60 lb injectors, P1SC Procharger, and other mods but they dont pertain to this diagnostic.
Car is 04Z with 30k miles, full exhaust, kenne bell boost a pump, 60 lb injectors, P1SC Procharger, and other mods but they dont pertain to this diagnostic.
09-02-2010, 08:55 PM
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As title says I have been troubleshooting a misfire this weekend. First off, I was getting O2 codes from no cats, so I took my car to the tuner to have them delete the codes, and right away they noticed a misfire (I couldn't tell it was there, but that's all they do is LSx's) they replaced a plug and a wire and sent me on my way. Now I am paranoid and went ahead and bought all new spark plugs (NGK TR6) and new wires (Summit 8.5 mm). Replaced them and pulled the valve covers to see if anything was bad. Everything appeared ok, so I put everything together and took it out for a spin.....It ran like crap.... Under moderate acceleration it would make a deep exhaust note, as if all cyls weren't firing and lacked power. I never gave it any more than moderate throttle for fear it would be bad.
Car is 04Z with 30k miles, full exhaust, kenne bell boost a pump, 60 lb injectors, P1SC Procharger, and other mods but they dont pertain to this diagnostic.
Car is 04Z with 30k miles, full exhaust, kenne bell boost a pump, 60 lb injectors, P1SC Procharger, and other mods but they dont pertain to this diagnostic.
09-02-2010, 10:02 PM
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Checked MAF, nothing crazy with it. Cleaned what little amount of dirt off. Same results, also checked all wires to ensure they were fully seated and cleaned main coil connection... Still the same.....
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09-05-2010, 03:38 PM
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Thanks to everyone for the help! Turns out the new spark plug wires, weren't so "new". Three of them would not "Ohm out" Swapped those three with three of my old ones that checked good and she ran like a champ. Sorry this was that easy, but I figured im buying new wires so they have to be good....wrong I guess Summit doesn't test there wires before they leave there facility.
