Troubleshooting a miss, etc

[Steve Wood]

Ed raised a point that I had meant to...be sure the crank sensor is in the correct slot and properly clearanced on all three blades of the reluctor/damper blades-also be sure it is not wobbling and is also tight...takes lotsa torque on these cars

Hook up a timing light and shine it on damper while revving the engine to see if it walks back/forth or sideways

think you said it did the same thing on the prior engine, but....

[TurboCajun]

yes Steve the cap is slotted its a caspers cap. but this weekend i am pulling the timing cover to replace the seal and will have to reset the cam sensor so I will adjusting it again. i know i have a lil miss issue which doesnt seem to be a very big deal to me, It runs good enough to drive, my concern it the fact that when i unplug the cam sensor and it runs rough or shuts the engine down makes me wonder what that problem is, so I will start from scratch saturday. last night i started testing the harness at the ecm and there were some voltage not as per the diagrams but i think it was the ones that went to the wastegate controller and erg selonoid, but i will check it and mark all results

[Steve Wood]

yes, it ain't right until it runs well without the cam sensor plugged in....if you have a caspers, then follow his instructions for setting.

For our enlightment, tell us what you have done....I understand that you converted from the hot air to an intercooled set up.

Is this the same engine?  Or did you change engines...aski ng because you told me you had the problem before.

Is this the same wiring harness?

Did you change cal pak chips when you changed the ecm?

Have you cranked it up with a timing light hooked up and strobed the balancer while revving the engine to make sure you don't have the crank walking back and forth due to too much thrust clearance? Also look for wobble in the balancer.  Check all three blades on the crank sensor for proper clearance.  You can get under the car with the timing light and strobe the crank sensor to make sure it is not getting ticked when someone revs the engine.

Check the module connector for bent pins or corrosion.  Check the ecm connectors for bent pins or corrosion as well as all pushing into the ecm rather than backing out of the connectors.

[TurboCajun]

this is the same engine , different wire harness, cal-pack was the correct numbers for 86-87 ecm when i converted the module, coil pack and ecm,. I will check on pins tomorrow when i have time to really take my time and observe. my timing light is broken and dont want to purchase another.

[Steve Wood]

go borrow one, then   very handy tool for looking for odd ball stuff

[SuperSix]

I have an old chrome Sears timing light - looks like a Battlestar Gallactica gun (original series with Erin Grey)

[TurboCajun]

worked on the GN from 930AM to 8pm, but not working on the electrical issues. I changed upper and lower ball joints, upper control arm bushings, complete tie rod replacement, front brake pads, turned rotors, repacked bearings and replaced seals. I am worn out. hopefully I have the energy to work on the electrical tomorrow if i dont go to the track.

[Steve Wood]

damn, come spend a couple of weeks with me...maybe I will get motivated!

[TurboCajun]

completed the ecm pinout check attached is the results. I put my old ECM back in to check, also retimed the cam sensor, checked pins on the coilpack, checked spark plugs they all look good and are all burning the same, car still turning off when i unplug the cam sensor.

[ULYCYC]

It has to be 180deg out if all checks out ok. I would reset it. Also large injectors like 50's or 60's can flood and stall in batch mode but with 38lb that is not a problem.

[TurboCajun]

to  me it sounds like it would be loading up, If i rev it it idles down and is OK for about 5-10 sec then it starts stumbling.

[ULYCYC]

What is the fuel pressue set at (static) at idle and vacuum line off?

[Steve Wood]

I have no idea at all.  It still sounds like a fuel timing problem.  I would be very tempted to rotate the slot a 180 degs from the current setting and see if it runs better, or backfires....

Other than finding tdc on the balancer to see if the ring has slipped, I don't know what to say...somethin g is wrong, but what it is, I don't know.

[TurboCajun]

I am giving up myself and will just run it like it is.     maybe just need to walk away for awhile. when i set the new cam sensor as per their instruction it would not start and backfired , so i bolted the cap in one place and move the balancer to 25 dg ATDC and moved the cam housing and used my meter to reset. I need to but another fuel pressure gauge, I lost a part one my old one and cant use it.

[ULYCYC]

Did you check the crank sensor as suggested earlier?