HELP!!!!!!!!!!

I just finished taking apart my 91 exp 4.0 l engine. I thought i was just doing head gaskets but it turns out i did that as well as redoing one head because of a crack. I did new rods as well. the only thing good was the lifters and the one head. Just put everything back together and now it does not hold idle very well. It will run good but when you let the gas off it dies most of the time can't figure it out so i have to ask the masses

i used nascar approved gaskets but i really wanted to use ford ones because they are better.

oh and the bottom end seemed fine. I'll do it another year lol.

I have all ready tried a different tps but it did not help a hell of a lot

oh and it ran just fine before other than blowing antifreeze out the exhaust

thanks all

graham

 

check the iac, if i runs fine that should be your problem

 

the iac shouldent go bad from rebuilding the motor try this

Idle Re-learn Procedures


1) Turn off all accessories & disconnect the battery for 5 minutes.

2) Reconnect battery. Disconnect the Idle Speed Control (ISC) solenoid located just behind the throttle body on the drivers side of the upper intake plenum.

3) With the truck in NEUTRAL, run the engine at 2500 rpm for 30 seconds.

4) Let the engine idle for 2 minutes.

5) Put the truck in PARK (or NEUTRAL if manual trans.) and adjust the idle speed stop screw until the idle is at 700rpm.

6) Turn engine off and let sit for 2 minutes then repeat steps 1-5 once.

7) Disconnect battery for 5 minutes then reconnect.

8) Reconnect the Idle Speed Control (ISC) solenoid.

9) Run the engine at idle for 2 minutes.

10) Quickly depress the accelerator pedal to the floor and release it immediately, allowing the engine to return to idle.

11) Lightly depress and release the accelerator allowing the engine to return to idle.

After carefully following the above steps, the engine should now have reset its base idle to factory specifications. The idle should now be smooth and at approximately 700rpm at operating temperature. If this procedure does not correct the fast idle condition, carefully check for vacuum leaks at the throttle body flange gasket and at the intake snorkel to throttle body interface. If no vacuum leaks are detected and the condition still exists, a condition that is unrelated to the mechanical throttle body assembly exists and must be diagnosed and repaired

 

thanks guys


that's what I was thinking too blly. The truck has been disconnected from the batter for 4 days and I need to run it to reset the computer. I'll be workin on it today

thanks guys

the iac and tps were good before i tore it apart so unless the plug got buggered or something I can't figure why they would be messed up but it's allways a possibility.