91 ZR-1 Cutting Out Under Load - Page 7 - ZR-1 Net Registry Forums

Pete · 08-27-2008

Quote:

Originally Posted by GregCrowe

Well, finally after 2 years I have now ordered the Accel fuel injectors and a new fuel pressure regulator. This morning I have a new problem. I am now informed that the 90-92 Corvette ZR1 fuel pressure regulator is a discontinued item. I'm still reading 32 psi with a new fuel filter. Any suggestions on where to get a FPR ? An adjustable one would be ideal.

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

Pete

GregCrowe · 08-27-2008

Quote:

Originally Posted by Pete

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

Pete

Ouch $350. Any other options ?

08-27-2008

Quote:

Originally Posted by GregCrowe

Ouch $350. Any other options ?

Your dealer is lazy.

17112220

Ray Denison Chevrolet
1-800-527-5452

Pete · 08-27-2008

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

Pete

GregCrowe · 08-27-2008

Quote:

Originally Posted by Pete

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

Pete

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.

Pete · 08-28-2008

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

GregCrowe · 08-28-2008

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.

GregCrowe · 10-19-2008

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.

GregCrowe · 10-19-2008

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.

tccrab · 10-19-2008

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

08-27-2008	#64
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	Re: 91 ZR-1 Cutting Out Under Load Ok,more affordable AutoZone.com G/P Sorensen Part # 800-311 $109 Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

08-28-2008	#66
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	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 __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

08-28-2008	#67
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	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.

10-19-2008	#68
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	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. Last edited by GregCrowe; 10-19-2008 at 05:14 PM.

10-19-2008	#69
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	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. Last edited by GregCrowe; 10-19-2008 at 07:14 PM.

10-19-2008	#70
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,650	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 __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] Last edited by tccrab; 10-19-2008 at 08:47 PM.