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Tractor Talk Discussion Forum

O/T: '92 Caravan engine code

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MeAnthony

01-13-2007 21:42:34




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The patient: '92 Dodge Caravan, 3.3 v6, auto
The symptoms: cold start is good; runs smooth. After a couple minutes, it starts getting rough, won't idle by itself. If kept between 2000 and 3000 rpm, it will stay running, but rough. Won't rev above approx. 3200 rpm. Exhaust gets red hot. To me, this would be either overfueling or retarded timing, but it's all controlled by the computer, so it's non-adjustable. We've replaced the cam sensor, the crank sensor, the spark plugs(twice), the fuel filter and checked the fuel pressure. The Check Engine light is showing a Code 27. According to my Haynes manual, this is: "Injector number x ('x' can be 1, 2, 3 or 4. This doesn't make sense to me, as it's a v6 enging?) output driver doesn't respond properly to the control signal(turbo and multipoint systems)"

Can someone explain this code in layman's terms for me?
Opinions and suggestions are welcome and appreciated.

Thanks for your time,
Anthony

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Jim WJ

01-14-2007 19:47:31




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
Meanthony A couple of years ago I repaired a Buick V-6
With some of the same problems except the red
hot manifold. This ended up being a fuel injector.
The only way I found this problem was to run
a resistance check on each seperate injector
and at the same time [ blow cold air on the injector then blow hot air on it ] By doing this
I got a major change in resistance on one injector. All 6 injectors were replaced at this
point. The hot and cold tool that is perfect
for this test is Snap-On number YA862 they call
it a choke tester. page E29 in catalog 800. Jim WJ

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RWT

01-14-2007 16:17:10




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
You could have a bad MAP sensor. It reads the vacuum.

Codes 26 or 27 point to a open or short in a controller circuit. Possibly in an injector circuit.

This is all I can tell you. You need someone that can plug into that computer. It just doesn't work replacing parts. And I was guessing at your vehicle ID but it should be close.

RT



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davpal

01-14-2007 11:16:04




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
The catalytic converter is plugged tighter than a drum. Change it and your problems will go away. Drive it and the hot back pressure will burn up all your smog pump and emission hoses.



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RusselAZ

01-14-2007 10:14:49




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
The code is for an injector driver not responding as commanded. This can mean several things. An injector may be shorted or open. The wiring for the injectors could be shorted or open. It's not suppose to rev over 3000 in park. The computer limits the engine rpm without a ground speed sensor signal.

First place I would look on this vehicle is under the battery tray. all the wires going to the ecm are under there. You will need a volt and ohm meter to find the bad circuit. Dodge engine computers are pretty rugged so I wouldn't suspect it first.

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Craig in WV

01-14-2007 09:55:56




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
If you need anymore help, go to www.allpar.com it's the best (I think) minivan or anything Mopar site out there.



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Dave in Tx

01-14-2007 09:30:53




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
if exhaust is ok, a bigtime vacuum leak will also cause them to run rough and get plenty hot.



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MeAnthony

01-14-2007 08:46:18




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 Re: A little more info in reply to MeAnthony, 01-13-2007 21:42:34  
The oxygen sensor has been replaced.
It runs the same with the exhaust pipe disconnected from the manifold.
We've also tried a couple other coil packs(used, but from running engines).

My apologies, but I only had 1 eye open when I originally posted.

Oh darn! I only HAVE one eye! Dang it!

Anyway

Thanks again,
Anthony



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Jim WJ

01-14-2007 06:35:32




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
[ Exhaust back pressure ] On the 3.3 this is
the number one reason your manfolds are getting
red hot. I work on alot of these and have never had it happen from any other failure. Jim WJ



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wildonewest

01-14-2007 06:29:03




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
I'm not sure what code # 27 is but it sounds like to much fuel like perry said "bad temp sensor" or Allen "pluged converter" Also the o2 sensor(s)could be bad. o2 sensors read the air/fuel mixture and send that info to the PCM telling it to run rich or lean and o2 sensors only start working after they warm up. You may have 1 or 2. One before the converter and/or one after the convertor. Make sure you have no exhaust leaks before your last o2 sensor! Ck your wiring to the o2 sensors and make sure they are not riped off or burned off and if so splicing some times will not work because it changes continuity. If all wiring is ok to the sensor(s) try unpluging them each one one at a time while it is running poorly and see if it changes anything. also you could try to remove the one o2 sensor before the converter and tell how much exhaust blows out the port hole. If the converter is pluged it will blow air out the port like an air compresser more so then the tail pipe. I think it could be the temp or the o2 sensors but it could still be a bad injector dumping to much fuel. look at your spark plugs and see which one is fouled. if all is fouled it is a sensor/wiring problem and if you only find one fouled plug replace that injecter. It could be other sensors. Ck all wiring to the sensors. The battery could leak onto your wire harnes which is under the battery (bad idea by mopar) Hope this helps!! Good luck and let me know if you have any more? My email is open.

Chris

Hotchkiss, CO

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perry in mi

01-14-2007 02:57:41




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
i would check temp sensor. if the sensor is bad it will run like the choke is stuck on when its warm. maybe over fueling causing the exhaust to heat up?. also go with what allen said about the converter. check and see how much exhaust flow you have at the tail pipe. the converter can also break apart and clog up the muffler. but the temp sensor is a common problom on alot of vehicles. let us know what you find out.

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Allan In NE

01-13-2007 21:50:18




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 Re: O/T: '92 Caravan engine code in reply to MeAnthony, 01-13-2007 21:42:34  
Have you tried dropping the exhaust to see if the converter is plugged?

Allan



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