Sweet forum app!! Little help with some back firing in the upper intake
 

New here I have a 89 5.0 H.O all pretty well redone. Just finishing up the motor with a complete block tear down and now with the new cam and new upper and lower intake I'm getting a lot of backfire in the upper intake any one deal with this before?

Firing order or timing issue.

Welcome!

Welcome

welcome from me too. Maybe a couple of plug wires in the wrong place?

+1 popping thru the intake 99% of the time is one of these. oh and welcome.

Thanks a lot. Will get some pics up soon.

with a aftermarket cam, might verify firing order is same as before too- IIRC the windsors had two different firing orders available depending on the cam.
if not a firing order issue, run a quick compression test to look for a open valve- maybe lash on a intake was set too tight.

Checked with crane on the cam also checked compression all numbers were 170, 180. These are awesome suggestions keep em rolling I appreciate all of them.

well since you checked the obvious ( tight rockers, timing, firing order) you could have faulty o2 sensors causing a lean condition. also since you just did a motor on this go over all your wires, connections and vacuum hoses and make sure they are all connected, very easy to miss one when doing a big job and having a sensor disconnected can cause problems also.

Finally got a profile pic up anyways. Thanks for the advice will try it and get back to you.

Well now it won't start. Possibly the ignition module??? So frustrating just want to drive!!! Any suggestions?

time to start a thread over in fox section since this is intro and so we can spend some time on it. also in the fox section we have a tech thread there is a "crank no start" help thread I have in there you can read.