bad stutter at 2000 rpm, only power key on

Originally Posted by Spanky1965

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

It will signal a fault code. And what are you going to be doing for extra fuel, when the secondaries are not running?

[Dynomite]

Originally Posted by Jeffvette

It will signal a fault code. And what are you going to be doing for extra fuel, when the secondaries are not running?

You are talking secondary injectors? And they normally kick in when the secondary opens?

So if you grounded "open" the secondary butterfly, you will not get fuel untill the secondary would normally open at which time the secondary injectors would receive a signal to provide fuel also? I am assuming then grounding the secondary has nothing to do with the secondary injectors.

Originally Posted by Dynomite

You are talking secondary injectors? And they normally kick in when the secondary opens?

So if you grounded "open" the secondary butterfly, you will not get fuel untill the secondary would normally open at which time the secondary injectors would receive a signal to provide fuel also? I am assuming then grounding the secondary has nothing to do with the secondary injectors.

Or are you saying by grounding the secondary, you are not only opening the secondary but disconnecting the signal input to the secondary injectors?

When you are grounding C17, you are only taking care of the solenoid. The ECM controls the fuel pump and injectors as well.

So if you take one component and you are constantly grounding it, you will set a code.


Basically the ECM sees the demand for secondary operation. It then sends a signal to the solenoid, and the fuel pump and the injectors. For everything to function.

[Spanky1965]

ok so what should I do next? please

Originally Posted by Spanky1965

ok so what should I do next? please

Refer to post 28.

[Dynomite]

I checked my primary injector resistances. I disconnected my battery and connected Inj-1 fuse side toward front of my 1991 ZR1 through digital ohm meter to ECM connector A (drivers side most left connector) A8, A3, A2, A7, A1, A12, A13, and A18. I got 14 ohms on 7 primary injectors and 6.5 ohms on one primary injector....OOPS. So....rather than check my seondary injectors without removing the plenum, I will remove the plenum and replace all injectors.

[Spanky1965]

ok, 12.7-13.2 on all 16 injectors

[Spanky1965]

Fuel presure is 50lbs, turn off key goes to 48 and sits there for over 5 minutes. with running its at 42, when you stab the gas it jumps up to 50. drops back to 42 at idle, and if you turn off the car it creaps up to 50

Originally Posted by Spanky1965

ok, 12.7-13.2 on all 16 injectors

Starting to get weak on the coil. Where they hot when tested?