I keep having to replace the plugs in my 1994 GT. It runs fine when the plugs are fresh, but after a month or two it starts backfiring, sputtering when taking off from a stop light, and smelling like fuel. The plugs that come out then are looking black and soot-covered. I just thought it was running too rich and causing the carbon buildup on the plugs and then they couldn't ignite the fuel mixture anymore after they got too bad.
I had the car retuned after putting a different intake on it and told my tuner to address the plug-fouling problem while he was at it. At first he said that since it's a new engine (400 miles on it now), that he tuned it a little rich so that when all the seals and gaskets sealed up over time it would lean out a little bit on its own and even out.
OK, well, screw that, it runs like crap and I want it tuned right. I told him that and he retuned it, and it seemed to be running fine again for a month or two but now its doing the same old thing. Now he says that since it sits for about a month at a time between driving session that the plugs are not able to keep the soot burned off of themselves and it is hardening up on them and I just need to drive it more often to keep the plugs in good shape.
I smell BS. Has anyone ever heard of that? Is this possible or is it a bad tune causing it? Should I switch to a hotter spark plug? Is the EEC-IV not capable of handling my combo and I need a stand-alone computer or something?
The setup is this: DSS level 20 347, TFS 190cc heads, TFS R-series intake, 60lb injectors, 90mm Abaco blow/draw through MAF calibrated, 75mm TB, TFS fuel system, MSD 6BTM, coil, 9mm wires, autolite spark plugs (forget the part number), AFM B-41 cam, AFM power pipe, JBA headers, MAC 2.5" Prochamber, MAC mufflers, Vortech V1-B supercharger, 12 PSI boost, SCT software/dyno tune on stock EEC-IV computer.
I just want to play with my car and it always has something wrong with it and I'm about to give up... HELP!!!!!
I had the car retuned after putting a different intake on it and told my tuner to address the plug-fouling problem while he was at it. At first he said that since it's a new engine (400 miles on it now), that he tuned it a little rich so that when all the seals and gaskets sealed up over time it would lean out a little bit on its own and even out.
OK, well, screw that, it runs like crap and I want it tuned right. I told him that and he retuned it, and it seemed to be running fine again for a month or two but now its doing the same old thing. Now he says that since it sits for about a month at a time between driving session that the plugs are not able to keep the soot burned off of themselves and it is hardening up on them and I just need to drive it more often to keep the plugs in good shape.
I smell BS. Has anyone ever heard of that? Is this possible or is it a bad tune causing it? Should I switch to a hotter spark plug? Is the EEC-IV not capable of handling my combo and I need a stand-alone computer or something?
The setup is this: DSS level 20 347, TFS 190cc heads, TFS R-series intake, 60lb injectors, 90mm Abaco blow/draw through MAF calibrated, 75mm TB, TFS fuel system, MSD 6BTM, coil, 9mm wires, autolite spark plugs (forget the part number), AFM B-41 cam, AFM power pipe, JBA headers, MAC 2.5" Prochamber, MAC mufflers, Vortech V1-B supercharger, 12 PSI boost, SCT software/dyno tune on stock EEC-IV computer.
I just want to play with my car and it always has something wrong with it and I'm about to give up... HELP!!!!!