LS1 START and KILL
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From: LOUISIANA
LS1 START and KILL I have a 1999 GMC SIERRA, came with 4.3 V6 swapped beefed up 5.3/4L60E. Stock intake, BTR stage 4 truck cam, upgrade valve springs, pushrods, 243/799 heads worked, new crank/cam sensor. Went to junk yard and found a harness that plugs into fuse box to operate dash. Everything is plugged up, new plugs/wires, all coils are good. My problem is, it starts and kill. VATS have been disabled. If I crank and put my foot on pedal, it’ll stay running, soon as I left off, kills. I have new fuel pump also. If anyone has ran into this problem, can you please help.
Well I was trying to help..LOL
Unfortunatley I'm unable to go into more detail on how to resolve his issue. Even thouh he may have gotten a V8 harness for the engine he still needs to address the INJ2 on the underhood harness. At least that is an issue with trying to use a V6 underhood harness for a V8 engine in the 99 Camaro.
Unfortunatley I'm unable to go into more detail on how to resolve his issue. Even thouh he may have gotten a V8 harness for the engine he still needs to address the INJ2 on the underhood harness. At least that is an issue with trying to use a V6 underhood harness for a V8 engine in the 99 Camaro.
Last edited by 01CamaroSSTx; Feb 9, 2022 at 12:04 PM.
Thread Starter
Registered User
Joined: Feb 2022
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From: LOUISIANA
Thread Starter
Registered User
Joined: Feb 2022
Posts: 3
Likes: 1
From: LOUISIANA
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VATS are off, but has the engine actually been tuned for the new cam?
Is the ECU the original one for that engine? What about the injectors, are those the ones to match that ECU?
Did you check pushrod length and order what was needed, or just buy pushrods and toss them in?
And 50% of the time this happens, it turns out the VATS weren't actually turned off despite claims that they absolutely were.
Is the ECU the original one for that engine? What about the injectors, are those the ones to match that ECU?
Did you check pushrod length and order what was needed, or just buy pushrods and toss them in?
And 50% of the time this happens, it turns out the VATS weren't actually turned off despite claims that they absolutely were.
Having to pedal the throttle is a really good sign that either the base running airflow needs to be increased and/or you need more bypass airflow from the throttle body set screw.
there might be other issues also but the above should help with you having to hold throttle
there might be other issues also but the above should help with you having to hold throttle