Looking for answer to car dying

[6Turbo6]

Ok here is the problem, the car is fine till it get to operating temp, then after driving like 45 min it will pop or backfire through the intake not the exhaust and die. Car will just crank then and not fire. After about 20min of waiting it will fire and drive again, only to repeat the same thing in about 15min. I have replaced to coil pack, module, plugs, wires, cam sensor. I have not had the car out driving for very long since doing this, so not sure if that fixed it. Has anyone else had this issue and if so what was the cause? The only thing I haven't replaced is the crank sensor. Another question I have is how do you set the crank sensor after installing it? Any help would be great.

Car is 87 GN stock

 

[1320]

I had a similar thing happen to me twice.....

once, the crank sensor......I was on a hiway trip....and evry 45 minutes or so it would die , not start, then 15 mnutes later start, run fine for alittle while then die....it made a 4 hr trip into an 8 hr trip.

The other was similar....it was a broken wire (touching/not touching) in the cap of the cam sensor. I soldered it together for a temp fix....(I didn t know I could start the car, and unplug the cam sensor) as long as it would start.

To set the crank sensor its .028 between the sensor and the reluctor wheel, not easy, but not impossible either, cut up a match book (card board) and sneak a small piece in there.

 

[6Turbo6]

Gonna change the crank sensor and see if that does it, thx for info.

 

[1320]

more than likely the sensor you have is good, change it and put the old one in the glove box....or risk it....

Chances are that if that is it, its just on the ragged edge of getting a reading.....and it hopefully just needs to be adjusted....

they are about 30$ if you buy a new one....

 

[Turbo Brian]

Assuming you have normal fuel pressure, the usual no start conditions are a faulty crank sensor, or a bad maf sensor.

I would change out the crank sensor (cheaper) and take it from there. If the problem continues, find a known good maf and replace yours.

Your old crank sensor may be encrusted in oil and the way the sensor works will be more obvious when everything is clean. Before you remove it, check which set of "fins" the interrupter ring rides between.

When you replace the crank sensor, use a match book cover or feeler gauge to set the gap at about .025". Rotate the engine over by hand one complete revolution to make sure that the sensor does not contact the interupter ring at any point, and that is all there is to it.

 

[HellOnWheels]

Originally posted by 6Turbo6
Ok here is the problem, the car is fine till it get to operating temp, then after driving like 45 min it will pop or backfire through the intake not the exhaust and die. Car will just crank then and not fire. After about 20min of waiting it will fire and drive again, only to repeat the same thing in about 15min. I have replaced to coil pack, module, plugs, wires, cam sensor. I have not had the car out driving for very long since doing this, so not sure if that fixed it. Has anyone else had this issue and if so what was the cause? The only thing I haven't replaced is the crank sensor. Another question I have is how do you set the crank sensor after installing it? Any help would be great.

Car is 87 GN stock

If the engine is backfiring back thru the intake it means the plug is firing while the intake valve is still open which can be caused by either the cam sensor or crank sensor.

I had the same thing happen and turned out to be the cam sensor interupter ring hold down screw had loosened shearing the interupter tab off letting the ring float around and causing MASSIVE backfiring.

Good Luck,
HellOnWheels

 

[we4turbo]

I had the same problems (without the backfire) drove me crazy.

Turned out to be the ignition module. Gets hot car cuts off. cools down starts back up. Find someone with a good coil pack and module and swap out to check it out.

Good luck.

David

 

[67turboCamaro]

Ignition module

I had this exact same problem. It turned out to be the ignition module.