bad stutter at 2000 rpm, only power key on

[tccrab]

Typically, bad fuel injectors cause symptoms such as a missfire at idle, rough running at a constant RPM and a loss of power when the secondaries are opened. It all depends on which injector(s) go bad.

When a fuel injector's internal coil goes shorted, it usually causes the injector to stick in one position. That position could be wide open fuel, partial fuel, or no fuel at all.

A bad primary injector will cause misfire at lower RPMS that goes away when the secondaries open.

Secondary fuel injector(s) failure will cause a loss of power which usually manifests itself when you can't feel much a difference between Full Power mode and Low Power mode on the Valet Switch.

Your situation as you describe it, sounds like the engine goes either rich or lean during the transition time between High Power mode and Low Power mode, which clears up as engine RPM increases.

TomC
"Crabs"

[Dynomite]

Originally Posted by tccrab

Typically, bad fuel injectors cause symptoms such as a missfire at idle, rough running at a constant RPM and a loss of power when the secondaries are opened. It all depends on which injector(s) go bad.

When a fuel injector's internal coil goes shorted, it usually causes the injector to stick in one position. That position could be wide open fuel, partial fuel, or no fuel at all.

A bad primary injector will cause misfire at lower RPMS that goes away when the secondaries open.

Secondary fuel injector(s) failure will cause a loss of power which usually manifests itself when you can't feel much a difference between Full Power mode and Low Power mode on the Valet Switch.

Your situation as you describe it, sounds like the engine goes either rich or lean during the transition time between High Power mode and Low Power mode, which clears up as engine RPM increases.

TomC
"Crabs"

Are the secondary injectors and primary injectors the same on a 1991 ZR1? What are the RC #s for primary and secondary injectors for a 1991 ZR1? Where is the best place to get RC injectors?

RC 205 or RC 210. You can only get them from rc directly. www.rceng.com

They will cut the injector for the differences in the primary and secondary.

I personally recommend accel injectors.

[Dynomite]

Originally Posted by Jeffvette

RC 205 or RC 210. You can only get them from rc directly. www.rceng.com

They will cut the injector for the differences in the primary and secondary.

I personally recommend accel injectors.

What are the Accel #s for secondary and primary (1991 ZR1) and where can I them?

[Spanky1965]

So Jeff can I ground the pink wire and drive the car to see if it helps?

[tccrab]

Originally Posted by Dynomite

What are the Accel #s for secondary and primary (1991 ZR1) and where can I them?

Jeffie'll get 'em for you.
He's the MAN!!!

TomC
"Crabs"

[tccrab]

Originally Posted by Spanky1965

So Jeff can I ground the pink wire and drive the car to see if it helps?

Hmmm..... Good question.
Better wait for Jeff to answer this one.
I'm guessing it might cause a lean condition, but maybe not.

Tomc
"Crabs"

[Dynomite]

Originally Posted by Spanky1965

So Jeff can I ground the pink wire and drive the car to see if it helps?

I am assuming you are then confirming that the ECM is good or bad? If it helps you are assuming that the secondary is not opening when they are controlled through the ECM? I do not know how this is different than guys/gals tying their secondary open. I would assume it would start out lean but I guess they are also modifying the secondary injector control.

I am just trying to figure how this all works It just takes time for some dunderheads like myself

[Dynomite]

Originally Posted by tccrab

Jeffie'll get 'em for you.
He's the MAN!!!

TomC
"Crabs"

[Spanky1965]

well my thought was if you can remove the system why cant you run with it grounded open???