Troubleshooting no start
Thread Starter
Launching!
Joined: Jul 2016
Posts: 220
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From: Martinsburg, WV
Troubleshooting no start -Cliff notes:
1999 5.3-manual Trans(t10) with no vss
-DBW pcm(blue/green), harness and tac module/pedal from ‘04 Silverado.
Ive already checked wiring numerous times. Engine turns over but the coils and injectors are not getting signal to fire although both have power with key on and while cranking.
-Grounds at both heads and frame.
-New crank sensor.
-Vats disabled via HP tuners.
-50+psi of fuel at rails.
-ive also tried injectors from a good car with no change.
The only code I’m getting is a p0107 (map sensor low volt) and I have tried another map sensor and checked the wiring.
Any ideas?
Just thinking out loud since I do not have a VSS signal I’m assuming that’s why hp tuners shows no rpm while cranking? I’ve read a lack of vss signal shouldn’t keep it from starting though.
1999 5.3-manual Trans(t10) with no vss
-DBW pcm(blue/green), harness and tac module/pedal from ‘04 Silverado.
Ive already checked wiring numerous times. Engine turns over but the coils and injectors are not getting signal to fire although both have power with key on and while cranking.
-Grounds at both heads and frame.
-New crank sensor.
-Vats disabled via HP tuners.
-50+psi of fuel at rails.
-ive also tried injectors from a good car with no change.
The only code I’m getting is a p0107 (map sensor low volt) and I have tried another map sensor and checked the wiring.
Any ideas?
Just thinking out loud since I do not have a VSS signal I’m assuming that’s why hp tuners shows no rpm while cranking? I’ve read a lack of vss signal shouldn’t keep it from starting though.
Last edited by sean byrd; Oct 23, 2019 at 10:51 AM.
VSS is vehicle speed, not engine speed so it has nothing to do with why you don't see any rpm while cranking. Do you have the crank sensor plugged in? Its behind the starter so may have missed that one?
Thread Starter
Launching!
Joined: Jul 2016
Posts: 220
Likes: 0
From: Martinsburg, WV
Thread Starter
Launching!
Joined: Jul 2016
Posts: 220
Likes: 0
From: Martinsburg, WV
Do you mean ground straps going to frame from engine, or engine harness grounds going to the frame? On a truck harness there are two grounds at the rear heads and a third one that goes to the block behind the power steering pump, that one will cause a no start if left unhooked.
Thread Starter
Launching!
Joined: Jul 2016
Posts: 220
Likes: 0
From: Martinsburg, WV
Do you mean ground straps going to frame from engine, or engine harness grounds going to the frame? On a truck harness there are two grounds at the rear heads and a third one that goes to the block behind the power steering pump, that one will cause a no start if left unhooked.
engine turns over no problem so I figured the grounds were adequate.
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Thread Starter
Launching!
Joined: Jul 2016
Posts: 220
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From: Martinsburg, WV
This evening I’m going to double check vats is disabled with hp tuners along with checking all the wiring. Again my only code is for the map sensor but I’ve also tried another map sensor so I’ll take a look at the wiring.