6.0 LQ4 Cuts Off and On
6.0 LQ4 Cuts Off and On I have a 6.0 LQ4 swapped into 83 K10. Engine will idle fine, but once you give any throttle input the engine starts to rev up to about 1500ish rpm then completely cuts out like the key was turned off, then lights back up around 800rpm then revs up and cuts again. It will keep doing it over and over until you let off the throttle then it will idle fine. Fuel pressure is constant at around 55psi the whole time.
**engine is stock with 799 heads**
**engine is stock with 799 heads**
I have an HP tuners log file. Checked grounds, measured and checked grounds and voltage at PCM etc.
This is on the same PCM that I think may be faulty as my IATs are pegged at 340+F and when you unplug the MAF it still reads 110F. MAP reads 99KPA with key off and 10KPA unplugged via HP tuners scanner.
This is on the same PCM that I think may be faulty as my IATs are pegged at 340+F and when you unplug the MAF it still reads 110F. MAP reads 99KPA with key off and 10KPA unplugged via HP tuners scanner.
UPDATE:
if anyone else is having a similar issue in a swap I figured out the problem.
The truck is an 83 K10 6.0 and SM465 manual trans. Turns out there was an abuse table that is set to 1600RPM factory. When running a stick you need to change the table and max it out. The PCM was still looking for signal from an auto trans and was putting the engine into abuse mode and limiting RPM to 1600.
if anyone else is having a similar issue in a swap I figured out the problem.
The truck is an 83 K10 6.0 and SM465 manual trans. Turns out there was an abuse table that is set to 1600RPM factory. When running a stick you need to change the table and max it out. The PCM was still looking for signal from an auto trans and was putting the engine into abuse mode and limiting RPM to 1600.
Staging Lane
Joined: Aug 2015
Posts: 80
Likes: 0
UPDATE:
if anyone else is having a similar issue in a swap I figured out the problem.
The truck is an 83 K10 6.0 and SM465 manual trans. Turns out there was an abuse table that is set to 1600RPM factory. When running a stick you need to change the table and max it out. The PCM was still looking for signal from an auto trans and was putting the engine into abuse mode and limiting RPM to 1600.
if anyone else is having a similar issue in a swap I figured out the problem.
The truck is an 83 K10 6.0 and SM465 manual trans. Turns out there was an abuse table that is set to 1600RPM factory. When running a stick you need to change the table and max it out. The PCM was still looking for signal from an auto trans and was putting the engine into abuse mode and limiting RPM to 1600.
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