my truck had pcm forless programing its a caddy engine but it cant idle and when i drive it it overheat

Sylvain

 

What does the cooling system look like? Radiator, electric fans? What sort of programming do you have as far as fan on/off temps? What temp thermostat does it have? Are the hoses connected correctly to reflect the "reverse flow" of the LT1 cooling system?

 

its a jimmy 1995 with radiator original and 2 flexalite 210 puller wire to turn on at 205,i got 180 themostat and the rest of the engine is stock except no cats no air pump,the engine run not to bad but the but goes like 200 to sky 260 and start overflow so i stop the engine and start the fan
Sylvain

 

by the way i got a datamaster file
Sylvain

 

Send me the dataMaster file.


atljar@aol.com

 

Your throttle stop screw has the blades open too far, OR you have a leak somewhere letting in additional air (bad intake gasket/tb gasket etc).

Your IAC counts are bottoming out at 0, so the computer is not longer in control of the idle. Try closing the blades on the TB a little, and try to get the iac counts at idle to 30-40 with the AC off. If they dont go up when you close the screw, more than likely you have a leak.

Also, is your #2 fan plugged in? I saw a DTC error for fan #2 fault, which may be the problem with the overheating, not to meantion you have the AC running with it idling really high.

Finally, are you sure the timing is correct on the motor and not retarded?

 

thank for your help
i found my problem it was the iac valve
but still have a problem with overheating
on idle its ok
when i floor the temp goes higher and higher
its a jimmy 1995 with 4.3 rad and 2 flexalite 12 inch

Sylvain