hotcam install misfire codes

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Apr 9, 2006 | 09:14 AM

silvr002001

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hotcam install misfire codes

just got the hotcam installed getting misfire codes on a couple of cyliders. any fixes other than plugs and wires. Idle is very rough. I'm gonna get a tune but I dont want to cover up a legit problem.

Apr 9, 2006 | 09:18 AM

the_merv

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Could be out of timing, the computer compensates for timing, but only so much. What else do you have done to it?

Apr 9, 2006 | 09:58 AM

silvr002001

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ok I have the K&n fipk, hotcam 1.6 rr's lt4 valve springs, long tubes,lt4km and y pipe, I have a high flow muffler welded into the stock pipes. Not my idea It was like that when I got it. After the cam install I had an open y pipe because the pipes from muffler wouldnt bolt to the y pipe. I had them welded together yesterday. After that I reset the computer. I drove around for a while and sure enough the engine light came back on. I took it to auto zone to have the codes pulled. I no longer have a misfire code but an EGR code. Is it possible y pipe noise caused the misfire code? Or did the autozone diagnostic machine just not pick it up?

Apr 9, 2006 | 10:59 AM

the_merv

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What year car? I had a Custom Tune cause I removed all the AC, AIR System and other stuff, and I have no codes at all. Could be the Knock Sensor, or the Timing is off by a hair...

Apr 9, 2006 | 11:16 AM

silvr002001

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1997 is the year, how rough was your idle when you had yours put in?

Apr 9, 2006 | 11:35 AM

the_merv

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I idle at 600-650rpm. It is a smooth idle, just choppy cause of the Cam. It has no problems. The engine barely shakes. The whole inside shakes because of the exhaust, but that is different...

Apr 9, 2006 | 11:49 AM

96capricemgr

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You NEED a tune, don't bother modding a computer controlled car unless you are prepared to do this with the mods. That cam needs different timing and a higher idle.
The computer can't really compensate for timing, it can pull timing if it detects what it thinks is detonation but that is about it.