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LS won't rev. Please help!!! Starts and runs great until I hit the gas. If you hold the throttle with steady pressure it revs to about 1340 rpms then it shuts off the injectors until about 950 rpms. Sounds just like a rev limiter, but way lower rpms. Motor is 2006 LS2. Intake, ECM& harness are 01-02 Confirmed the motor is a 24x-4x crank and a 1x cam. Fuel pressure is good All sensors look like they are working on the lab scope ECM has all security deleted and is stand alone Even installed the ECM into a friends 00 pick-up and it works fine. Confirmed when it does this the spark is still good. The crank and cam are matching up on the lab scope. It will rev if you leave tps plugged in but disconnected from throttle body and manually set at zero. If it has any voltage it won't rev. BTW I am NOT a mechanic so if anyone has any ideas please talk slow and in terms a third grader would understand. I gave up and took it to a mechanic, now he is ready to give up. Please help!:( |
Reach around behind the intake and check the MAP sensor, make sure it's plugged in electrically and plugged into the port on the manifold. Also make sure nothing is wrong with the MAF, as in no dirt or debris in the wires or stuck to the screen. Someone with a good scan tool should be able to look at live data and get a good idea what values the ECM is seeing and causing the trouble. Good luck, I hope you can figure it out. If you were around central Ohio I wouldn't mind helping out I like solving these types of issues. |
Fuel pump Is bad |
Originally Posted by Bronc j-8
(Post 18112424)
Starts and runs great until I hit the gas. If you hold the throttle with steady pressure it revs to about 1340 rpms then it shuts off the injectors until about 950 rpms. Sounds just like a rev limiter, but way lower rpms. Motor is 2006 LS2. Intake, ECM& harness are 01-02 Confirmed the motor is a 24x-4x crank and a 1x cam. Fuel pressure is good All sensors look like they are working on the lab scope ECM has all security deleted and is stand alone Even installed the ECM into a friends 00 pick-up and it works fine. Confirmed when it does this the spark is still good. The crank and cam are matching up on the lab scope. It will rev if you leave tps plugged in but disconnected from throttle body and manually set at zero. If it has any voltage it won't rev. BTW I am NOT a mechanic so if anyone has any ideas please talk slow and in terms a third grader would understand. I gave up and took it to a mechanic, now he is ready to give up. Please help!:( |
Originally Posted by 2000Hawk#317
(Post 18117438)
Fuel pump is bad? Please explain! My car had a similar issue and it was the intake air temperature sensor being broken and the ECM reading -256 degrees and throwing tons of fuel and timing in the motor which eventually killed my pump |
Checked the map sensor and it is reading. Swapped out maf sensor and it still does it. Ready to buy a whole new harness but I'm not sure that's the problem. |
Originally Posted by Bronc j-8
(Post 18112424)
Starts and runs great until I hit the gas. If you hold the throttle with steady pressure it revs to about 1340 rpms then it shuts off the injectors until about 950 rpms. Sounds just like a rev limiter, but way lower rpms. Motor is 2006 LS2. Intake, ECM& harness are 01-02 Confirmed the motor is a 24x-4x crank and a 1x cam. Fuel pressure is good All sensors look like they are working on the lab scope ECM has all security deleted and is stand alone Even installed the ECM into a friends 00 pick-up and it works fine. Confirmed when it does this the spark is still good. The crank and cam are matching up on the lab scope. It will rev if you leave tps plugged in but disconnected from throttle body and manually set at zero. If it has any voltage it won't rev. BTW I am NOT a mechanic so if anyone has any ideas please talk slow and in terms a third grader would understand. I gave up and took it to a mechanic, now he is ready to give up. Please help!:( . |
Originally Posted by LS6427
(Post 18118475)
Did the car run perfect for a long period of time.....and this just started? Or is this a new combo you put together and it has never run right? . |
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