First off, thanks to all for info on cam timing. I'm having trouble setting the Ign timing on a 1987 supra w/ 7MGTE. I can't twist the CPS far enough to get it to 10 deg BTDC. The closest it will get is 10 deg after TDC. If I pull the CPS and move it CCW one tooth and twist the housing all the way the other way, the closest it will get is 16 deg BTDC. My first suspect was wrong cam timing. Thanks to everyones input I think the cam timing is ok. I've triple checked everything on the cam timing. So now onto what sensors might be telling the ECU to change the Ign timing. I'm thinking a sensor is telling it to advance when it should not be, or not telling it to advance when it should. Thanks Brad

Just want to make sure you know you have to short 2 pins on the ECU diagnostic plug to properly set timing. -Dave

Thanks, got that. But I have tried it both ways and there is no difference in timing. Makes me think something is not telling the ECU what it should. I know the jumper wire is making contact because the check engine light flashes. No codes, thankfully we're past that. I had to replace MAF and a Knock sensor. BIG bucks.

That just doesn't seem to make any sense. 1 tooth on the CPS does not equal out to over 26 degrees in timing. The proble would have to be in the ignition system somewhere. Couldn't be anything but the CPS itself really. Nothing else can effect ignition timing by that much. The most you'll get from any other sensors is 2-5 degrees, if that. Are you maybe using a mismatched CPS for that years ECU? Or different coil packs? I just don't know where else it could be. You can adjust almost 20 degrees +/- just by rotating the CPS. Make sure the CPS isn't 180 degrees out. I've seen that have a similar effect. The cyllinders fire in pairs, so the first cyllinder could be getting anothers spark signal. (3 coils, 6 cyllinders.) I'll bet that's it. -Dave

Actually, now that I've thought about it even more, I'm almost 100% that the sensor is 180 out. It has an uneven tooth count, which means that at the opposite side, there is a slot that will put you right in between your current timing ranges. -Dave

Thanks for all the help. I'll try it and let you know. Thanks again for all your help. Brad