neal64ss

iTrader: (1)

I put a 2003 LM7 with 4l60e in a 64 chevelle. Engine runs perfect until it warms up. After it warms up the car still runs great except when I come to a stop the engine will either die on almost die. Doesn't do this when the engine is warming up.

Its like the idle speed is too low after the engine warms up.

Anyone know of what gremlin would cause this symptom. Its real agravating, as the engine runs great except for this one issue.

ls1nova71

iTrader: (4)

Speed sensor hooked up/working?

mantycarguy

Is your throttle body clean? If not try cleaning the carbon out first with throttle body cleaner. If this does not help slightly adjust the throttle plate.

LS_Junky

vauum leak maybe try spraying carb cleaner around intake gaskets and anywhere vacuum goes through and if idle changes it has a leak wherever u sprayed..

neal64ss

iTrader: (1)

Speed sensor is verified working, throttle body is clean, no vacuum leaks present.

How does one go about adjusting the throttle plate? I presume it needs to be open a slight bit more?

LS_Junky

the idle screw is set to where it should be from the factory. if you were to open it up a bit then you will have to get the pcm tuned so it can know lowest tps position..

psiconversion

iTrader: (5)

Have you verified the fuel pressure? What is it set at?

Jon
PSI

neal64ss

iTrader: (1)

I have not verified fuel pressure. I am using a corvette type FPR and just presumed it would be correct. Guess I need to check that.

ctd

iTrader: (1)

Is that DBW or cable TB? Any camshaft change or other mods? New problem?

psiconversion

iTrader: (5)

I have seen the FPR go bad more than I would expect. Worth a look at the pressure when you start it and when the problem starts happening.

Jon
PSI