Troubleshooting a miss, etc

[TurboCajun]

put the new crank sensor in, rotated the sensor in both directions about 1/8" at a time starting and stoping the engine at every move, still the same untill i get to far where it would not start, everytime i try to unplug the sensor it shuts down, rotated the sensor 180 and still the exact same crap.   

[Steve Wood]

If I had a module spare, I would send it to you to try.  Something is definitely wrong and I don't understand what it could be.

The cam sensor diagram shows the signal being sent to the module and going thru a buffer/amplifier which I would guess cleans up the signal and amplifies it..then it comes out and goes to the ecm.  I would like to think that a voltage drop at the ecm end would show it was working, but, maybe not.

Why don't you give John Spina a call and ask if he has any ideas.  Be sure to tell him it would not run when you installed his cap as per the instructions

[TurboCajun]

a video , the cracking sound is a pulley making noise everytime it sputters

[TurboCajun]

ok put the camsensor back to instructions. when the engine is idling ok I can unplug the cam sensor and it doesnt shut off the engine, but if it is running rough and i unplug it it kills the engine. I am very lost and dont know what else to do,

[Steve Wood]

As I suggested above, call John

[Steve Wood]

also, see if you can get with Theo or Clay and swap coil/module packs and try one of their ecms as well

[TurboCajun]

i had ordered a used ecm from G-body and put it in which didn't change. I dont know the guys you mentioned, are they near me?

[Steve Wood]

Theo is Poppy1440 and Clay is Nasty Wendy....yes, they are not too far

I mention the ecm just to have the luxury for KNOWing that it was good although I would think there is only about a 1% chance you would get one with the same problem

[TurboCajun]

i spoke to John this morning and he is thinking the module, he also mentioned trying to change the fuel pressure. I am going to try a new O2 sensor to start,

[Steve Wood]

Module would be top of my list at the moment if the balance mark has not shifted....

[ULYCYC]

I also mentioned fuel pressure a few pages ago. You said you have no fp gauge. Try and back off (ccw) the fpr adjustment screw one full turn and see if it helps. If not just move back.

[Steve Wood]

I had not noticed the lack of a fuel pressure gauge... sure needs to be right, but I don't know how it would affect the cam sensor...on the other hand, if the blms and o2s are good at idle, then the fuel pressure is adequate for idle and that would have no effect on the cam sensor...at idle

I assume the coil/module bracket is well grounded to the engine, the pack is tightly bolted to the bracket, and there is a groundstrap to the firewall?

[ULYCYC]

Not sure if it would matter but the plug wires are opposite on the 87 coil compared to 85 coil.  How are yours set up ?. I attached a diagram.

[Steve Wood]

that makes no difference at all....IF the module is wired properly to the coil pack

see bottom diagram  http://www.vortexbuicks-etc.com/coil.htm

[Steve Wood]

took me two hours one day on the T I built for my son to figure out that a prior owner had mis wired the module and somehow routed the plug wires to run anyway....