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hemispheres
Dodge Dakota
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6/18/2007
10:29:52

Subject: 1992 3.9L Dakota code 27
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Looking for assistance. Engine runs rough, feels like a dead cylinder, followed by the CEL. Scanned the computer at O'Reilleys. Code 27 left bank misfire, trigger input missing or low, cylinder 1 misfire. The condition will typically clear it self with engine running normal and only the CEL illuminated.
I have replaced in the last week new, plugs, plug wires, rotor, dist. cap, ignition coil, crankshaft position indicator, air temp sensor, and fuel filter. I removed and cleaned the IAC and TPS. When the misfire occurs while in the driveway, the exhaust smell becomes rich, it burns the eyes. Maybe I have a fuel delivery problem and I continue to chase the ignition system. Looking for other suggestions. Thanks



Bob Lincoln
Dodge Dakota
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6/19/2007
08:44:15

RE: 1992 3.9L Dakota code 27
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27 Injector circuit isn't switching when it's told to (TBI)
OR (MPI) injector circuit #1 not switching right
OR (turbo) injector circuit #2 not switching right
OR (all 1990-) injector output driver not responding
- check computer, connections



?
Dodge Dakota
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6/22/2007
13:18:23

RE: 1992 3.9L Dakota code 27
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Injector problem - possible bad injector
or connection to it. Remotely possible -connection to computer , but NOT likely-= I believe at least up to 95 the computer
connection is one line -common to all injectors
( the extra vacuum at a given cylinder determines
if that particular injector should spurt ).
Which also brings up the possibility of a vacuum
leak , Do you hear any 'hissing' ?



Mark Dziedzic
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6/22/2007
14:53:03

RE: 1992 3.9L Dakota code 27
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I do not detect any vacumn leak. I will place a vacumn gauge on the intake vacumn port and will be looking for 19-20 inches of Mercury. Engine does not run hot or does ny show a fast idle.
I appreciate your continued interest in my case. I replaced the dist. rotor as I mentioned earlier. Is there a replaceable electronic pickup assembly inside the distributor?
I feel it is ignition related. I can smell the exhaust go rich when the misfire occurs which tells me fuel is being injected into the intake but not being burned.




?
Dodge Dakota
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7/04/2007
09:15:39

RE: 1992 3.9L Dakota code 27
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Either wiring ' connection' related to
injector, or sounds more like -one injector
is staying ON - flooding at least one cylinder.
Number 1 cylinder according to the code..



hemispheres
Dodge Dakota
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7/04/2007
19:05:50

RE: 1992 3.9L Dakota code 27
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I never thought about the injector having a long dwell time, staying on.
Yesterday I replaced the TPS and today the engine computer thermostat. The sensor was located behind the AC compressor. It was not an enjoyable parts swap out. I will keep posting on the outcome of this diagnosis.



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