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Backfiring through throttle body at random times.
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syllinx
New User
Feb 8, 2013, 6:47 AM
Post #1 of 7
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Backfiring through throttle body at random times.
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I have a 2000 dakota 3.9, automatic with 191,000. My issue is that at random times only when idling in drive, I will start to accellerate then truck will not want to move and it will start stalling and go under 500 rpm. If i keep pressing the gas it will start backfiring through the tb. I thought it was simple so I replaced the plugs, wires and distributor cap and rotor but it keeps doing it. I even ran b12 chemtool through a tank of gas. When it quits acting up it will suddenly try to lunge forward. Any help would be nice. I am not getting any check engine codes.
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 8, 2013, 8:06 AM
Post #2 of 7
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Re: Backfiring through throttle body at random times.
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What is the fuel pressure when this is happening?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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syllinx
New User
Feb 8, 2013, 8:15 AM
Post #3 of 7
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Re: Backfiring through throttle body at random times.
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I don't really have any easy way to test. It is only when i'm starting to take off from a stop and it does not happen at every stop sign. It doesn't matter how hard or soft I hit the gass. Although if i try to floor it it will backfire faster. I will try to find some way to check fuel pressue since fuel pump is factory. I forgot to mention this has been happeing for 5 years now but it its happing every day now. It used to happen once or twice a month. I have even used the STP water emoving thinking tha tmight be part of it. I have always been low income so I couldn't get someone thats a hardcore mechanic to check it out.
(This post was edited by syllinx on Feb 8, 2013, 8:28 AM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 8, 2013, 8:37 AM
Post #4 of 7
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Re: Backfiring through throttle body at random times.
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It may be an induction backfire due to a lean condition. Checking fuel pressure would be one thing to eliminate if it isn't a problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 8, 2013, 8:38 AM)
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syllinx
New User
Feb 8, 2013, 8:40 AM
Post #5 of 7
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Re: Backfiring through throttle body at random times.
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Could it somehow be the IAC valve? A friend here at work said it could be getting stuck then loosening up? The iac does seem to emit a super loud hissing sound
for about 30 seconds till engine is a little warm after sitting a few hours.
(This post was edited by syllinx on Feb 8, 2013, 9:01 AM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 8, 2013, 9:02 AM
Post #6 of 7
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Re: Backfiring through throttle body at random times.
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IAC won't cause an intake backfire.
If the IAC was stuck shut, the engine wouldn't idle. If the IAC was stuck open, the engine would idle at a high rpm.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 8, 2013, 9:04 AM)
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syllinx
New User
Feb 8, 2013, 1:08 PM
Post #7 of 7
(1620 views)
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Re: Backfiring through throttle body at random times.
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Thanks for clearing that up with the IAC. I will see what I can do this weekend and see if there is any place to rent a Fuel pressure tester.
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