bonehead Posted December 22, 2011 Share Posted December 22, 2011 i get some backfire / popping in the throttle body / intake area. what would cause that?? Link to comment Share on other sites More sharing options...
1994SEV6 Posted December 22, 2011 Share Posted December 22, 2011 i get some backfire / popping in the throttle body / intake area. what would cause that?? uh.no you don't. You can't have "backfire" in the throttle body. lol. It's physically impossible. Backfire is when you have post-combustion in the exhaust. Popping might be your injectors. Is this at high RPMs or all across the spectrum? Link to comment Share on other sites More sharing options...
nismothunder Posted December 22, 2011 Share Posted December 22, 2011 Lies!!! Back fire through intake It burns dont it. Timing related. Link to comment Share on other sites More sharing options...
1994SEV6 Posted December 22, 2011 Share Posted December 22, 2011 Lies!!! Back fire through intake It burns dont it. Timing related. thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaat's something else entirely. dat engine. Ok, you're right. I was going to include the phrase "unless your engine is running backwards", but I didn't think it was necessary. I guess I was wrong. Link to comment Share on other sites More sharing options...
Tungsten Posted December 22, 2011 Share Posted December 22, 2011 i get some backfire / popping in the throttle body / intake area. what would cause that?? How often does it backfire? Does the truck even run? Did someone install your distributor backwards? Link to comment Share on other sites More sharing options...
sewebster Posted December 22, 2011 Share Posted December 22, 2011 The FSM has a diagnostic procedure in the EF/EC section for backfire through the intake. Link to comment Share on other sites More sharing options...
bonehead Posted December 22, 2011 Author Share Posted December 22, 2011 (edited) yes the truck runs. ok more of a popping/bogging sound and it only happens when the truck is warmed up and can't rev over 3k rpm. i had the truck over 1yr now and about a month ago this started. Edited December 22, 2011 by bonehead Link to comment Share on other sites More sharing options...
Tungsten Posted December 22, 2011 Share Posted December 22, 2011 sounds to me like the timing belt jumped a tooth Link to comment Share on other sites More sharing options...
1994SEV6 Posted December 23, 2011 Share Posted December 23, 2011 sounds to me like the timing belt jumped a tooth if so, you need to not turn the engine on until you fix it. You need to replace the belt and consider yourself insanely lucky Link to comment Share on other sites More sharing options...
bonehead Posted December 23, 2011 Author Share Posted December 23, 2011 sounds to me like the timing belt jumped a tooth how do you find out if it skiped a tooth? do i need a new belt if it is? Link to comment Share on other sites More sharing options...
Kingman Posted December 23, 2011 Share Posted December 23, 2011 Only reason for a belt to skip a tooth is if the tensioner broke or the belt is so old it's way stretched. Run a compression test on it or set the engine at TDC and see where the rotor in the distributor is pointing. If everything is good it should be pointing directly left if you're facing the engine. A bad MAF can cause backfiring through the intake as well as it somewhat control timing, not often though. If the distributor was in backwards the engine would not even turn over with the starter. Chevys and Fords yeah, these no. Link to comment Share on other sites More sharing options...
Tungsten Posted December 23, 2011 Share Posted December 23, 2011 (edited) Chances are that the last timing belt done was not properly tensioned or installed. If the belt is only a tooth off, the valves don't get smacked. You will just get random misfire and timing problems. Replacing the timing belt is probably the best idea. Edited December 23, 2011 by Tungsten Link to comment Share on other sites More sharing options...
sewebster Posted December 23, 2011 Share Posted December 23, 2011 If the distributor was in backwards the engine would not even turn over with the starter. Chevys and Fords yeah, these no. I had my distributor in 180 degrees off once (because I was at #4TDC not #1TDC) and it turned over until my muffler blew up. If that's what you mean by backwards. It won't start up though! Link to comment Share on other sites More sharing options...
bonehead Posted December 24, 2011 Author Share Posted December 24, 2011 timing belt and timing is fine. i been hearing about the crankshaft sensor would make the truck hesitate, bogg out and even stall when engine warms up. is that true? Link to comment Share on other sites More sharing options...
1994SEV6 Posted December 24, 2011 Share Posted December 24, 2011 timing belt and timing is fine. i been hearing about the crankshaft sensor would make the truck hesitate, bogg out and even stall when engine warms up. is that true? generally, a faulty crankshaft sensor will prevent your vehicle from starting. If it does manage to start, it would stall very quickly. Link to comment Share on other sites More sharing options...
Tungsten Posted December 24, 2011 Share Posted December 24, 2011 that could be a problem too which you can test for with the ECU diagnostic procedure (see howto section) there is a fail safe mode that the ECU will go into unlike TBI, the MFI trucks will run with a bad CPS just very poorly Link to comment Share on other sites More sharing options...
anperalta Posted August 21, 2014 Share Posted August 21, 2014 but if you are getting a misfire problem first you got to know is which cylinder its failing because the popping in the throttle body could be an intake valve stuck.......... Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now