Re: 91 ZR-1 Cutting Out Under Load
 

Gave Jeff's ECM a try, and as the norm with this car.......... not fixed. At this point it pretty much has to be coils. I see both Summit and Jeggs have their own high performance, low resistance coils for $31-33 each. I think I'll give the Summit coils a shot, not too expensive and they're red which will match the car and plug wires. If that doesn't fix it, I'm totally stumped.

Re: 91 ZR-1 Cutting Out Under Load
 

Wow, 33 months, 132 posts, and 7,274 looks later and the problem is still not solved!!
This has to be some kind of a record.
Brother please don't give up now, you've got the entire nation of the ZR-1 brotherhood pulling for you.
While you're at it replacing the coils you might as well replace the plug wires if you have not done so earlier.
Saw an Accel set listed over on ebay that may be had reasonably:
http://cgi.ebay.com/ebaymotors/Accel...1%7C240%3A1318
Good luck and may the force be with you.

Re: 91 ZR-1 Cutting Out Under Load
 

Done a long time ago, plugs and wires, and fuel filter, and fuel injectors, and fuel pressure regulator and ECM and............ blah blah blah :(

Re: 91 ZR-1 Cutting Out Under Load
 

Greg,

Sorry you're not closer to Chicago. :(

Re: 91 ZR-1 Cutting Out Under Load
 

Here's the next try:

http://static.summitracing.com/globa...m-850017_w.jpg

http://store.summitracing.com/partde...5&autoview=sku

Re: 91 ZR-1 Cutting Out Under Load
 

http://www.msdignition.com/product.aspx?id=5059


I installed these last spring on one of the several occasions I found excuse to pull the plenum. So far so good. Let me suggest that before spending the money on those, if you'd like to borrow my set of stock coils and see what happens, let me know. I'm intrigued.

Re: 91 ZR-1 Cutting Out Under Load
 

Does anyone know if these MSD 8224 coils will work on our ZR-1s?
http://static.summitracing.com/globa...e/msd-8224.jpg
http://store.summitracing.com/partde...ew=1&N=700+150

Re: 91 ZR-1 Cutting Out Under Load
 

See above.

Re: 91 ZR-1 Cutting Out Under Load
 

Yes, they will all work. This is what's called a DIS coil for all GM cars using these type coils. As far as supposedly high performance verions, there is:

1. The MSD
2. The Accel
3. The Summit
4. The Jeggs

All 4 look like pretty much the same thing, all with brass terminals. They are probably all 4 made by the same place. The Summit and Jeggs versions are the cheapest.

Re: 91 ZR-1 Cutting Out Under Load
 

Well well well.... that was a novel. I just read all posts from the beginning to the most recent.
I had heard about this thread a couple of years ago from Jeff Flint and very sorry to see it is still active.
Let me toss out my thoughts and story.

I fought an illusive problem on my ZR1 in 1998 after having the car for about 2yrs. I drove it to the midwest and back and it developed this stumble on acceleration. As a result I ended up developing a pattern check jig for the injectors after studying the data from my scan tool.
(Diacom). No good, still stumbled so I bought RC injectors (not a mistake because of the stainless steal construction of the RC) still had the stumble. I bought a spare ECM (not a mistake as it turns out cause to pass the state inspection it is easier to replace the ECM than the chip, and safer) still had the stumble. The fuel pump #2 then failed (unrelated problem) still had stumble. I then developed an emissions problem which after much searching turned out to be the CATS. Returning to the search for the stumble I next replace the coils. Fix! It toot took several years of slowly going at it. The only difference in my case is I would drive it anyway even with the problem. That is what uncovered it since eventually the plugs told the story. I learned a LOT about the car and reading the scan data.
I hope the coils fix it !!!

PS. I am going to toss my bosh/platinums ...... I just checked the plugs as a result of reading the thread (novel) and #3 was fouled. I put in a used AC plug (since I keep spared of many many working parts) and the fouling stopped........hmmmm)