Problems getting motor running properly?
Thread Starter
Staging Lane
Joined: Aug 2004
Posts: 70
Likes: 0
From: Phoenix
Problems getting motor running properly? I have completed my conversion on my Caprice with a 6.0 with LS6 manifold and TR224 cam, comp 918springs, Pacesetter headers. 7.4 pushrods, custom programing completed, converted from a ETC to manual throttle body, 80mm,Maf still has screen, wiring is a conversion from the donar vehicle, exhaust GHL 2.5 dual no x-over at moment.
Have a really strange problem that I can not identify. Begging for help!!!
Car starts up idles great, no problems, sounds good!! (With the car at this point its like getting a lap dance "TEASE" LOL)
Attempts to Rev motor the motor will not accelerate past 1300rpms. This is not a attempt to drive this is just a motor ideling and rev on the throttle.
What I have checked so far:
No codes posted,,(can force a code)
Fuel pressure 60 static, 59 at idle, 59 when attempting to rev.
Double / triple checked all wiring and connections,, metered all (checked with ohm meter to ensure no impedence)and checked them back to PCM.. All looks good
No manifold leaks, intake or exhaust,
New spark plug wires - plugs,2 sets,
Pulled motor apart check cam for walking and correct alignment and all OK.
have NOT replaced Crank pos or cam position sensors,
New throttle pos.sens.
new IAC
================================================== =======
I went out to do more checking / monitoring. Used a Auto Xray and seeing some strange things that may be point to possible bad PCM or programing????
Throttle position on autoxray never moves off of 0% ???
I back probe the signal going into the PCM from the TPS and the Value changes from .45 volts to 4.6 volts.. Though Auto Xray tells me that the PCM is not recognizing the input from the TPS??
Timing advance at idle = 28 degrees.
When attempting to accelerate throttle it immediatly goes to 0 to 7 degrees. Motor will only RPM to about 1300?
================================================== ========
any thoughts recomendations????
Any thoughts / suggestions are welcome,, Thanks Roger,,
Have a really strange problem that I can not identify. Begging for help!!!
Car starts up idles great, no problems, sounds good!! (With the car at this point its like getting a lap dance "TEASE" LOL)
Attempts to Rev motor the motor will not accelerate past 1300rpms. This is not a attempt to drive this is just a motor ideling and rev on the throttle.
What I have checked so far:
No codes posted,,(can force a code)
Fuel pressure 60 static, 59 at idle, 59 when attempting to rev.
Double / triple checked all wiring and connections,, metered all (checked with ohm meter to ensure no impedence)and checked them back to PCM.. All looks good
No manifold leaks, intake or exhaust,
New spark plug wires - plugs,2 sets,
Pulled motor apart check cam for walking and correct alignment and all OK.
have NOT replaced Crank pos or cam position sensors,
New throttle pos.sens.
new IAC
================================================== =======
I went out to do more checking / monitoring. Used a Auto Xray and seeing some strange things that may be point to possible bad PCM or programing????
Throttle position on autoxray never moves off of 0% ???
I back probe the signal going into the PCM from the TPS and the Value changes from .45 volts to 4.6 volts.. Though Auto Xray tells me that the PCM is not recognizing the input from the TPS??
Timing advance at idle = 28 degrees.
When attempting to accelerate throttle it immediatly goes to 0 to 7 degrees. Motor will only RPM to about 1300?
================================================== ========
any thoughts recomendations????
Any thoughts / suggestions are welcome,, Thanks Roger,,
