Sweet forum app!! Little help with some back firing in the upper intake
4/28/12, 11:51 PM
#1
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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?
4/29/12, 08:04 PM
#8
legacy Tms Member
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.
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.
4/30/12, 07:55 AM
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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.
5/1/12, 07:05 AM
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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.
Last edited by skunk21; 5/1/12 at 07:06 AM.
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