Thread: Bad cam/crank sensor?

Tweet

Would you hint towards theTPS even though it sometimes surges at idle too?

I tested everything, besides the cam crank sensor. Ok, what happens is, when it won't start(cranks over, and it won't fire), its got gas pressure, no vacuum leaks, cylinder compression i good(at least thats what my co-workers say). Now, the thing it doesn't have is spark. After it cools down, it fires right up. At my shop I've had a car that would die while driving and wouldn't start until it has cooled down. The answer was a crank sensor. I'm going to take my chances tomorrow, and see what happens after i change the sensors on the Thunderchicken(common sense to change them every once in a while). I'll keep you posted. Thanks for the hint, i'll check that first thing.

I did it the old school way. Grabbed a prybar, and while the car was running, i tapped the crank sensor, and yes it stalled. I changed the sensor, and now there still is a minor missfire, but, i ordered a TPS and i will put the cam sensor in also. Do you know where that TPS is located? On the throttle body?

ussually opposite side of the throttle cables, the shaft goes into it... on some cars you may have to adjust the sensor position.....

OK, I replaced the crank sensor, TPS, cam sensor, and the missfire is gone, BUT...something I have never noticed before, i believe the catalytic converter is clogged or gone. My exhaust sys is like this:1 cat per each pipe coming out of the manifolds, then there is a joiner catalytic converter, a resonator and then my pipes(no more mufflers). Now, the cat that is from the bank of cylinders #1,2,3,4 rattles when you bang on it with your fist. The joiner cat rattles too. I believe that would be a part of my hesitation or stumble upon my acceleration too. I can hear it in the exhaust pipes when u push it hard. I believe I have old broken parts in the cats that block the exhaust gasses from passing freely. Any ideas?

I know you might say its the heat shields, but no, its not the heat shields fault. They still have the good original welds.If I'm gonna punch them through I'm going to have no back pressure

well.... if you hooked up to a smog machine and gave me some readings i could tell you if the cats are any good, but thats about the only way to tell.... according to the state of california a cat is considered damaged the second exhaust passes thru it