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Old 06-14-2014, 08:02 PM   #1
izzyluna
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Default B21ft runs good when cold bad when hot

So I have a b21ft and it will run and rev fine when it's cold but as soon as it warms up If I give it any gas it will die out or I have to lightly feather it to build the revs and it will still hiccup but it will idle just fine then randomly die any ideas?
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Old 06-14-2014, 08:05 PM   #2
Mylesofsmyles
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ECT sensor or Control Pressure Regulator...sounds suspect
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Old 06-14-2014, 10:17 PM   #3
izzyluna
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Which ect? Isn't there 2?
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Old 06-14-2014, 10:38 PM   #4
Wren
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You need to download and read the manuals at www.k-jet.org, then buy a pressure tester for k-jet. Otherwise, you're just shooting in the dark.
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Old 06-14-2014, 10:41 PM   #5
PRVersion
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Kjet doesn't care what temp your engine is aside from when it starts actually adjusting fuel via the o2 sensor.

It sounds to me like your control pressure regulator (warm up regular) goes too lean when hot, you have a vacuum leak, and/or your o2 sensor is dead in the water.

Check for vacuum leaks, and if there are none, try unplugging the CPR before you go to drive it next and see if it drives better for longer.

If you have a multimeter, check o2 function by porting the positive lead on it's plug (leaving it plugged in), it should jump back and forth between .15 or so and .9 or so volts. If the range is much smaller or it just hangs in one area, it's junk.
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Old 06-14-2014, 10:47 PM   #6
PRVersion
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Quote:
Originally Posted by Wren View Post
You need to download and read the manuals at www.k-jet.org, then buy a pressure tester for k-jet. Otherwise, you're just shooting in the dark.
This is also a fantastic plan, but if you can't afford a pressure tester, my post is a great place to start.
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