408 backfire on start
408 backfire on start I am trying to start my new 408 and when it is about to start it backfires big. My coil packs are from a 98. Is there any way I could have hooked them up wrong when I put them on the brackets. Anyone have any ideas ?
Originally Posted by chromeplated500
Check the timing....quick double check that the dots are lined up... doesnt hurt to check..
Hey listen, Yes it is very possible that you may have put the wrong plugs on your coils. Check them, I did the same mistake once and learned from it. Otherwise check the timing, that the dots are line up in the cam. Hoepfully its something easy. Let us know how it turns up. Good Luck!!!!
I installed the cam and double roller, it was definitaly dot to dot. I checked piston to valve clearance. I am going to try a friends coilpacks and if that does not work I think it is the timing. My friend came over with his hp tuners the night I was finishing up but had to leave before I was done. Maybe something is off in the tune. I will let everyone know what happens.
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I dumped the oil because it smelled a little like fuel and put in new oil. I then put my brothers coil packs on from his 5.3 truck and pulled the fuse for the fuel pump. There was so much fuel in there from trying to start it yesterday that it fired right up. When I put the fuse back in I got it to run for about two minutes before it stalled and I could not get it started again. The gauges started getting all funny when you turned on the ignition. I now have to figure out how to wire my coil packs and get my friend over with his laptop. It did sound good when it started with 12.1 compression and a big cam.
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Originally Posted by DROPTOPLS1
Yes it ran for a couple minutes. What is a crank re- learn?
-Geoff
also check the camshaft position sensor, a bad camshaft sensor could thow off your timing casuing the backfire issue. when my crankshaft position sensor went out, it would still start and run after clearing the codes but ran rough at higher rpm until I did the crankshaft re-learn.
