GMPP harness help. No injector pulse
GMPP harness help. No injector pulse well I just finished my swap and it wont start. I have checked both crank and cam sensors. they both have power, ground and ref. Getting power to the injectors just no pulse.
motor is a TBSS with a vette intake and GMPP harness.
motor is a TBSS with a vette intake and GMPP harness.
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Joined: Feb 2006
Posts: 1,170
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From: Rockfield Kentucky
Hmmm, Is there spark?
Do you have all the ground wires hooked up to the back of the heads?
The ECU kicks the injectors from the gound side. If you don't have the grounds attached that might be the problem.
I have had 2 of these harnesses and they work very well.
Several grounds, a keep alive power and ignition on power wire. They all start right up.
Robin
Do you have all the ground wires hooked up to the back of the heads?
The ECU kicks the injectors from the gound side. If you don't have the grounds attached that might be the problem.
I have had 2 of these harnesses and they work very well.
Several grounds, a keep alive power and ignition on power wire. They all start right up.
Robin
Last edited by Robin L; Mar 12, 2009 at 11:42 AM.
Figured it out. I had the switched Ign wire hooked up to when key was on ignition, but when key went into engine start it would lose power.
found a good switched power and it fired right up.
it stumped me for a day. I was getting power, ref, ground at every connector.
checking everything with the key on it was all correct. then started checking power to the injectors and saw that the voltage was dropping when it went into start.
found a good switched power and it fired right up.
it stumped me for a day. I was getting power, ref, ground at every connector.
checking everything with the key on it was all correct. then started checking power to the injectors and saw that the voltage was dropping when it went into start.
If it makes you feel any better, you're not the first person to have that peoblem. I have seen several different posts with the same problem.
Last edited by LS1MCSS; Mar 13, 2009 at 04:42 AM.
