LS3 won't start
Thread Starter
Staging Lane
Joined: Apr 2005
Posts: 56
Likes: 0
From: Stockholm, Sweden
LS3 won't start I have LS3 crate engine with GMPP controller kit that wont start.
I have a fuel pressure thats 54psi...I know it's a little bit low but should it start or not with what fuel pressure?
When I try to start it stumbles for three seconds and then it's like the ignition or fuel is completely cut of. If I don't remove the positive cable from the battery and wait for minute the ECM wont turn on the ignition or fuel again.
If the crank sensor is bad but the cam sensor is working will HP Tuners still show RPM?
I get the following codes from HP Tuners:
[] P0010 - A Camshaft Position Actuator Circuit (Bank 1) (Old) (Current) (Immature)
[] P0036 - HO2S Heater Control Circuit Bank 1 Sensor 2 (Old) (Current) (Immature)
[] P0056 - HO2S Heater Circuit Bank 2 Sensor 2 (Old) (Current) (Immature)
[] P0315 - Crankshaft Position System Variation Not Learned (SES) (Pending) (Old) (History) (Current) (Immature)
[] P0452 - Fuel Tank Pressure Sensor Circuit Low Voltage (Old) (Current) (Immature)
[] P0463 - Fuel Level Sensor Circuit High Voltage (Old) (Current) (Immature)
[] P0807 - Clutch Position Sensor Circuit Low (Old) (Current) (Immature)
[] P2078 - Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High (Old) (Current) (Immature)
[] P0315 - Crankshaft Position System Variation Not Learned
What should I do?
I have a fuel pressure thats 54psi...I know it's a little bit low but should it start or not with what fuel pressure?
When I try to start it stumbles for three seconds and then it's like the ignition or fuel is completely cut of. If I don't remove the positive cable from the battery and wait for minute the ECM wont turn on the ignition or fuel again.
If the crank sensor is bad but the cam sensor is working will HP Tuners still show RPM?
I get the following codes from HP Tuners:
[] P0010 - A Camshaft Position Actuator Circuit (Bank 1) (Old) (Current) (Immature)
[] P0036 - HO2S Heater Control Circuit Bank 1 Sensor 2 (Old) (Current) (Immature)
[] P0056 - HO2S Heater Circuit Bank 2 Sensor 2 (Old) (Current) (Immature)
[] P0315 - Crankshaft Position System Variation Not Learned (SES) (Pending) (Old) (History) (Current) (Immature)
[] P0452 - Fuel Tank Pressure Sensor Circuit Low Voltage (Old) (Current) (Immature)
[] P0463 - Fuel Level Sensor Circuit High Voltage (Old) (Current) (Immature)
[] P0807 - Clutch Position Sensor Circuit Low (Old) (Current) (Immature)
[] P2078 - Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High (Old) (Current) (Immature)
[] P0315 - Crankshaft Position System Variation Not Learned
What should I do?
I believe there is a crank relearn procedure that you do with a scanner. I don't remember if it will keep it from running. But basically you have to start that and then usually you have to run it at 3grand for a few seconds.
Does your switched power source have power when the key is in the 'CRANKING' position?
Jon
PSI
Jon
PSI
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Thread Starter
Staging Lane
Joined: Apr 2005
Posts: 56
Likes: 0
From: Stockholm, Sweden
ECU body is not grounded, i'll try that on sunday.
All other grounds are connected to the block and heads.
The switched power source is connected directly to the battery.
All ideas and thougts are welcomed!
Thanks
Jacob
All other grounds are connected to the block and heads.
The switched power source is connected directly to the battery.
All ideas and thougts are welcomed!
Thanks
Jacob
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Also, your engine needs to be grounded to the frame. These engines need to be grounded lots, the ECMs like it.
I got ground strap from the back of the block to the body, front of the head to the frame or the battery negative, I cant remember right now and its a BLIZZARD outside today and I cant find my cars.
I got ground strap from the back of the block to the body, front of the head to the frame or the battery negative, I cant remember right now and its a BLIZZARD outside today and I cant find my cars.
On The Tree
Joined: Feb 2013
Posts: 184
Likes: 2
It may sound silly, but are you sure you got the MAF in the air intake tube and connected to the ECU harness correctly?, if I get the MAF disconnected or not inserted in its slot the engine would run for a second or two and then will die.
