Re: 91 ZR-1 Cutting Out Under Load
 

Call Lingenfelter Perfomance they have the adjustable.
Price use to be $350.

Pete

Re: 91 ZR-1 Cutting Out Under Load
 

Ouch $350. Any other options ?

Re: 91 ZR-1 Cutting Out Under Load
 

Your dealer is lazy.

17112220


Ray Denison Chevrolet
1-800-527-5452

Re: 91 ZR-1 Cutting Out Under Load
 

Ok,more affordable
AutoZone.com
G/P Sorensen Part # 800-311 $109

Pete

Re: 91 ZR-1 Cutting Out Under Load
 

Man you had me excited with that post. However, talked to my Auto Zone guy who had to call GP Sorensen and found out the part is discontinued. Back to square one.

Re: 91 ZR-1 Cutting Out Under Load
 

In that case what i would do if the car is not a collector i would modify my feul rails and buy an Aeromotive adjustable regulator from Jeg's for $150 and never have to worry about the regulator again.
I would think modifying the rails and regulator should be a total cost of $200-$250.
I know it costs about the same or a bit more over a stock replacement but here you will have an adjustable and available regulator.

Just my thought.
Pete

Re: 91 ZR-1 Cutting Out Under Load
 

Good news, Borg Warner is now making a ZR1 specific fuel pressure regulator. The Borg Warner part number is 22848. It's about $200 but I was able to pull some strings and get it ordered for $140.

Re: 91 ZR-1 Cutting Out Under Load
 

I am happy to report that after almost 2 1/2 years, I have now fixed the cutting out problem. Today me and a buddy installed the new Accel injectors and new fuel pressure regulator. It was a 4 hour job. About one hour of that though was cleaning out all the rusty crap from the fuel rails where the injectors plugged in.

After finally doing the injector swap, I have 2 very important pieces of advice for anyone doing an injector swap:

1. PARTIALLY DRAIN THE COOLANT FIRST !!!!!!!!

I didn't drain any coolant and kept fighting coolant coming up thru injector housing and into the front cylinder intake holes. I had to constantly paper towel out the coolant in the front cylinder secondaries. Even after trying to keep the coolant out of the intake holes as best we could, when we first tried to start the motor, it would not turn over. We immediately knew what was happening. We didn't want to risk hydrolocking the motor so we removed the front 2 spark plugs on each side and kept cranking the motor until it blew all the coolant out of the cylinders. It took a little while but we got the coolant all out, put the plugs back in and everything was fine.

#2. After bolting down the fuel rails with the new injectors installed, before installing the plenum, make sure you cycle the key several time to build up fuel pressure and make sure you don't have any leaks. 16 injectors and 32 o-rings can easily add up to 1 little problem. Sure enough, one of the 16 injectors had a small scuff in the upper o-ring and it leaked. Good thing we checked first. After replacing the o-ring all was good.

Re: 91 ZR-1 Cutting Out Under Load
 

Well crap, spoke too soon. The cutting out is back. This car is seriously possessed.

See if this makes any sense whatsoever. When you start the car up first thing in the morning, it runs fine. If you let it warm up completely and go drive it around, it runs fine. Consistantly the 2nd time you start the car up each day the cutting out begins. Same thing happened after the injector change. I started the car up, let it fully warm up and drove it around. It ran fine, even doing what really makes it cut out which is to put it in a high gear at low speed. After letting it sit for an hour, I went back out to drive the car and it immediately started cutting out.

Tom, a couple pages ago and probably well over a year ago, you offered to let me borrow your spare PCM for diagnostic purposes. I'd love to take you up on that offer now. At this point about all that's left is the PCM, ignition module and coils.

Re: 91 ZR-1 Cutting Out Under Load
 

The ECM's show up on eBay fairly often.
There's one for sale right now but I'm *very* suspicious.
It's *way* too cheap and I'm pretty sure that the LT1 version is not the same as our LT5 version.

TomC