lost spark in cylinder 1

[Great White]

I don't think the engineers originally intended for these coil packs to live in the environment that they do. There's a lot of heat under the plenum, and very little airflow. When I pulled my plenum for a bad injector and vacuum leak, I found that 3 of the 4 coils had cracked plastic housings in multiple places.

I've dealt with several other GM vehicles that used the same DIS coils and they are usually in a much better (cooler) location. However, their faiure rate is pretty regular. I doubt many older GM cars have their original DIS coil packs. Almost every older GM car I see at the junk yard with DIS has at least one new coil on it.

[WARP TEN]

Originally Posted by Great White

I don't think the engineers originally intended for these coil packs to live in the environment that they do. There's a lot of heat under the plenum, and very little airflow. When I pulled my plenum for a bad injector and vacuum leak, I found that 3 of the 4 coils had cracked plastic housings in multiple places.

I've dealt with several other GM vehicles that used the same DIS coils and they are usually in a much better (cooler) location. However, their faiure rate is pretty regular. I doubt many older GM cars have their original DIS coil packs. Almost every older GM car I see at the junk yard with DIS has at least one new coil on it.

This may be a little bit off the beaten track, but has anyone tried to mount the coils in a position other than under the plenum? I realize there is not a great deal of extra room under the hood, but since heat is the enemy and other GM cars do it, curious if anyone has made the attempt. Anyone? Anyone? Beuller? --Bob

[Young1]

IMHO the coils and wires are cheap. Put in a new set and be good for another 20 years. R and R the starter while there. Install a new vacuum solenoid. Good to go for a long time. But this is from the perspective of my personal labor is cheap.

[XfireZ51]

Great White,

I just went thru same process. These were 13 year old MSD COILS. 3 of 4 cracked.

http://www.zr1.net/forum/showpost.ph...8&postcount=16

[XfireZ51]

Originally Posted by Paul Workman

Oh, I thought they might have cracked because you have a habit of riding on top of guard rails. OH! Never mind! (That was another ZR-1

Paul,

I think you?ve ridden that horse a few more times. Time to let it die.

[Great White]

Originally Posted by WARP TEN

This may be a little bit off the beaten track, but has anyone tried to mount the coils in a position other than under the plenum? I realize there is not a great deal of extra room under the hood, but since heat is the enemy and other GM cars do it, curious if anyone has made the attempt. Anyone? Anyone? Beuller? --Bob

I can't provide any links, but I recall this being discussed elseware. Probably a topic for another thread. I believe the conclusion was reached that Coil On Plug with an aftermarket stand alone ECU is the way to go. 🤑🤑🤑🤑🤑

[matt101590]

WELP here is an update,


changed the coil and now i have no spark anywhere so my Ignition Module is off to be tested to see if its any good. i am lost now on what to do with this thing, hopefully its not the IM cuz that will probably mean the death of the car as they are pretty much IMPOSSIBLE to find

[rkreigh]

Originally Posted by WARP TEN

This may be a little bit off the beaten track, but has anyone tried to mount the coils in a position other than under the plenum? I realize there is not a great deal of extra room under the hood, but since heat is the enemy and other GM cars do it, curious if anyone has made the attempt. Anyone? Anyone? Beuller? --Bob

Hi Bob,



I remember some of the "dropped base plenum" cars remote mounted the coil pack and it's a great idea.



I'm fixated on Coil on Plug and going megasquirt as the DIS boxes are at a premium and I have a good one. The waste spark stuff is old school (I had them on my turbo buick) and the MS3 pro is down around $1100 bucks now.


Don't need no stinkin DIS

[rkreigh]

Originally Posted by matt101590

WELP here is an update,


changed the coil and now i have no spark anywhere so my Ignition Module is off to be tested to see if its any good. i am lost now on what to do with this thing, hopefully its not the IM cuz that will probably mean the death of the car as they are pretty much IMPOSSIBLE to find

DIS boxes are still around. Post up that you need one. they are expensive, but cheaper than dumping the car.


if you want to sell the car not running, you will take a bath. Reach out to the brothers, or go MS as it's definitely a workable path and will make the car easier to service with coil on plug like the LS (no spark plug wires) and no issues with the DIS as it's no longer in the mix. The MS gives much better tuning and full wide band learn fuel trim which is light years ahead of the old factor ECM. Integration is not trivial, but it's been done. Raptor has the "plug and play" wiring harness for about 2k and they only real sacrifice is that the "security" system and gas mileage interface doesn't exist and become inoperative.



I'd like to do my implementation a bit different as the raptor stuff retains the DIS. It's not needed and coil on plug is way better! for the big bucks the DIS is costing us, seems like a no brainer to spend less and get better at the same time!!

[Paul Workman]

Originally Posted by rkreigh

DIS boxes are still around. Post up that you need one. they are expensive, but cheaper than dumping the car.


if you want to sell the car not running, you will take a bath. Reach out to the brothers, or go MS as it's definitely a workable path and will make the car easier to service with coil on plug like the LS (no spark plug wires) and no issues with the DIS as it's no longer in the mix. The MS gives much better tuning and full wide band learn fuel trim which is light years ahead of the old factor ECM. Integration is not trivial, but it's been done. Raptor has the "plug and play" wiring harness for about 2k and they only real sacrifice is that the "security" system and gas mileage interface doesn't exist and become inoperative.



I'd like to do my implementation a bit different as the raptor stuff retains the DIS. It's not needed and coil on plug is way better! for the big bucks the DIS is costing us, seems like a no brainer to spend less and get better at the same time!!