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Epyon
Dodge Dakota
JOIN HERE
3/16/2008
19:27:47
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 Subject: Back fires when in open loop/Choke on
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Message:
1997 DAK RC 3.9V6 5 Speed 4x4 86,000 Miles
This truck is really starting to piss me off now. One thing after another but now it seems it likes to backfire when the choke is on. After i let the truck warm up its fine but when driving around for the first bit whenever i switch gears the truck will backfireat 2000RPM. Anything anyone would know that would cause this. Sensor or to reset the choke so it doesnt run as rich at first? Oh ya new timing chain less then 5000miles so i know the timing isnt out any ideas
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steved
Dodge Dakota
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3/17/2008
06:14:54
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
you do not have a choke backfire is from lean not rich, try a new o2 sensor that fixed mine, good luck
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GB2000
GenIII
3/17/2008
09:01:26
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
Are you throwing any codes?
Turn ignition on, off, on, off, and back to the on position really quickly and see if it gives you any codes.
I don't think the O2 sensor readings come into play until the truck goes into closed loop...
Could be plenum gasket...but I'm not sure why it'd only do that while cold and not all the time.
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daddio
Dodge Dakota
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3/17/2008
09:05:44
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
GB2000 is right. the PCM doesn't use the O2 until the engines warmed enough to go to closed loop.
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Epyon
Dodge Dakota
JOIN HERE
3/17/2008
19:30:36
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
Nope not a single code and its not the O2 cause it doesnt use the o2 sensor in open loop. not the Plenum either i looked
Just started doing it last week no changes to the motor. I think im going to reset the computer and see what happens. Other then that no clue
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daddio
Dodge Dakota
JOIN HERE
3/17/2008
20:00:00
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
could be the engine coolant temp sensor going out. or maybe just a bad connection on it?
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J and J Auto
GenII
3/18/2008
01:39:31
| RE: Back fires when in open loop/Choke on
IP: Logged
Message:
sounds more like a cros fire bad cap or wires
or posible valve going bad from running lean
once warm it don't leak
a lifter pumping up can also cause that run some
sea foam for a few miles than change oil
check it
run it while still poping shut it down and pull
the plugs and see what they look like to determin
which cyl is doing it and go from there
Larry
J&J Auto
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