I put together a 383, TF heads 219 cam SR and LS1 25lbs injectors. My timing is right. Valves are adjusted right, I have spark and I have fuel. my plugs are dripping wet. It sounds like it wants to fire but it wont. Then when I let off I get a pop in the exhaust. triple checked the timing and it was all good. Any ideas?

89 Formula. Chip has been burned for the injectors.

 

The distributor could be 180* out or the CTS could be messed up.. Hook up a scanner to it and see what the puter is doing when you are trying to start it.

Kat

 

IAC might have been set wrong way. As a result throttle air bypass does not provide enough air. Can you tap gas pedal when cranking? Does it make a difference? If so - it's IAC.

Another possibility - bad MAF or MAP sensors.

 

Everything worked perfect on the car before I put the new shortblock in and Injectors. Everything else is off the new combo. I am now thinking about the air situation. It sounded like it wanted to fire but then BAM out the back. I want to redo the valves and open the throttle a little more just to get it going. I hate flooding it out with a new motor.

 

its an easy one tripple check the plugs and wires make sure you didnt mix them up. i can scan in....since they are so close follow the wire by hand to the plug....

 

No matter how many times I checke dthe distributor it always perfect then today I said lets try again and found TDC and said lord if you love me I'll be 180 out. Shure ebough 180 out. Yurned it around fired in 3 secs with 55 PSI Oil and perfect idle