Lost and need help.1993 ZR1

[Dynomite]

Originally Posted by Route 66

I have not been able to get the 405 HP for some time.

I was getting a service LTPWS. I solved that problem.

Thanks Ellis

How do you know you are NOT getting 405 HP (specifically)?


How did you solve the LTPWS service light (Specifically)?

[Route 66]

Originally Posted by Dynomite

How do you know you are NOT getting 405 HP (specifically)?


How did you solve the LTPWS service light (Specifically)?

First the 405. The engine power never changes. I would call it. Seat of the pants.


About the LTPWS it would set it self only when I would drive under 25 mph for about 1 mile. That happen's when I drive on the county road to the state HWY. There are a few small rocks on the county road surface. I drive slow to protect the paint....I could not clear the trouble code with the grounding of A & B. But it doesn't show up on the DIC unless I drive under 25 for about one mile which by the GM repair manual states is normal. The strange thing is it never would throw a LTPWS code until I had to replace a wheel sensor some time back. Since then I have replaced that wheel sensor twice with new sensors same part number. Under the same driving conditions it now throws a code. I hope this makes since.

Thanks for your help..Ellis

[Route 66]

Originally Posted by secondchance

93 does not display full engine power on DIC. Green light next to the power key only.

Thank you I wasn't sure. It has been a long time since I have had full power work. I have had this car 25 years but don't get it out much. I would like to get it working so I can move on to another car project.

[ZWILD1]

My first 91 was the same way. I could tell it lost power. So I installed new injectors as it really needed them. I also did fuel filter and both in tank fuel pumps along with a new sock. Still not quite full power. With Marks Haibecks help we determined it was the round fuel pressure regulator that sits behind the plenum. Once replaced it ran like a scalded monkey. I believe it was leaking vacuum at the regulator. Easy fix. Probably didn't need to spend the money for fuel pumps in my case.

[Dynomite]

Originally Posted by ZWILD1

My first 91 was the same way. I could tell it lost power. So I installed new injectors as it really needed them. I also did fuel filter and both in tank fuel pumps along with a new sock. Still not quite full power. With Marks Haibecks help we determined it was the round fuel pressure regulator that sits behind the plenum. Once replaced it ran like a scalded monkey. I believe it was leaking vacuum at the regulator. Easy fix. Probably didn't need to spend the money for fuel pumps in my case.

I would be happy to take that non operational Fuel Pressure Regulator off your hands and I will gladly pay (shipping and a free lunch)

This is what I would do

Post 281 - The Improved LT5 Fuel Pressure Regulator
Post 282 - Changing Out Improved Fuel Pressure Regulator (IFPR)
Post 283 - Phil's (Jagdpanzer) Fuel Pressure Regulator Solution

[Ozruss90]

Originally Posted by secondchance

93 does not display full engine power on DIC. Green light next to the power key only.

What about on a 90? Should it show on the DIC. Mine doesn’t have full power either, and I’m about to start looking as to why not.

[efnfast]

On the 90's, the power key stays where you put it. Later years are momentary switches and need to be set to "full power" every start up. The 90's have a "full engine power" light in the DIC. I didn't realize later years didn't.

[Reichert]

I think it's important to stress that the 90 power key actually closes a circuit for the system to operate. In my car, the Full Power light was flickering intermittently, and the key switch was the culprit. I was able to fix it by dissasembling the tumbler and cleaning and shaping the contacts. As for the rest of the system, I also found a vacuum leak in the solenoid between the vacuum canister and the actuators. The solenoid spring and plunger were rusted pretty badly.

Sent from my moto g(6) play using ZR-1 Net Registry mobile app

[Route 66]

Originally Posted by Dynomite

I would be happy to take that non operational Fuel Pressure Regulator off your hands and I will gladly pay (shipping and a free lunch)

This is what I would do

Post 281 - The Improved LT5 Fuel Pressure Regulator
Post 282 - Changing Out Improved Fuel Pressure Regulator (IFPR)
Post 283 - Phil's (Jagdpanzer) Fuel Pressure Regulator Solution

I need to checkout some other things first maybe later.

[Route 66]

Originally Posted by ZWILD1

My first 91 was the same way. I could tell it lost power. So I installed new injectors as it really needed them. I also did fuel filter and both in tank fuel pumps along with a new sock. Still not quite full power. With Marks Haibecks help we determined it was the round fuel pressure regulator that sits behind the plenum. Once replaced it ran like a scalded monkey. I believe it was leaking vacuum at the regulator. Easy fix. Probably didn't need to spend the money for fuel pumps in my case.

I have installed a new set of 16 injectors. New fuel filter. new GM fuel pump assembly. new secondary vacuum pump. And repaired vacuum leaks while the plenum was off. It will not turn on or throw a trouble code saying why. Got me at a loss.
At this point I am thinking power key not working or maybe a bad sensor.
Something somewhere not making contact.

Any one know where I can buy a new fuel pump gasket, Between pump and gas tank. OEM type. Mine looks ok but would like to have a new one.

Thanks to all of you who have responded.