QuestionQUESTION: Roland I need your help again my 1991 Dodge Dynasty with the 3.3L V6 quits running on Thursday morning going to work running at 45 mph
the engine quit I got it to start back up I was 6 miles from home I went back to get my other car it did not do it again the car set until Tuesday I drove it then several miles and did not quit until I pulled in drive way and restarted ran engine a few min and quit again after letting it set a few min. it did this several times I checked Vac.hoses any ideas
ANSWER: Hi Bill,
It might be that one of the two rotational senors is failing as it gets hot, then recovers when it cools down.
But the best way to start on this issue would be to do a fault code readout using the ignition switch: turn it 'on-off-on-off-on and leave on' doing that in 5 seconds or less elapsed time. Then watch the check engine light, which remains 'on', to see it begin to flash, pause, flash, etc. Count the number of flashes before each pause. Then repeat the process to be sure of an accurate set of flash counts. Then tell the counts in order of appearance and we'll go from there.
Please "rate" my answer (see the PS below).
Thanks,
Roland
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QUESTION: Roland I checked the codes all I get is 12, 62, 55 could this be a fuel filter my wife told me she put fuel in on Wed and a tanker was leaving the station when she was going in
ANSWER: Hi Bill,
I would suggest that you run the fault code check again as the 62 code was not listed as available for the 3.3L engine in the '91 manual. Watch carefully for the pauses.
I suppose anything is possible with a recent fuel delivery but I doubt it would cause a filter problem because the filter is inside the gas tank and has a huge capacity for debris such that it seldom if ever needs replacement.
Let me know what you find by doing the code readout again. The rotational sensors have codes 11 and 54 by the way, which is a total of 11 flashes which is identical to 12 and 62 so you may bave missed a pause location.
Thanks for the rating and nomination, which by the way you can do again if you feel so-moved.
Roland
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QUESTION: Roland, I triple checked the codes I even recorded them to be sure of the flashes I had a problem with the 02 sensor and got a 52 code this seems almost what my car is doing now but back then car never quit just lost power I would pull over and feather gas peddle and then go on after a minute or so what are the names of the 2 sensors you told me about
thanks
AnswerHi Bill,
The 62 code was not defined/described until '93 so I don't know what to make of it in a '91 unless might you have a '93 or later PCM? If it is valid it says that the function of the pcm related to storing the odometer reading (for reasons of warranty validity, which begen in '92-3) failed to occur and suggests that the pcm has failed.
So if you believe that code you would look for a used pcm.
Alternatively you could check for spark, fuel pump activation, compression, fuel pressure...the basic elements of a functional internal combustion engine. Evem though you don't have codes for the rotational sensors you could check the signals from the crank sensor and the cam sensor. Turn the ignition switch to run position and rotate the engine by hand with a socket on the crank pulley bolt. Go to pcm plug and measure the voltage between pin 4 and 24 while you are rotating the crank by hand, and then measure between pin 4 and 44 similarly. Use fine straight pins to pierce through the wires at those pins of the pcm plug and attach your voltmeter leads to those specific pins. If the sensors work then you should see the voltage oscillate between 5 and 0.3v as you are turning over the engine by hand.
I am sorry to not be able to give you any other possibilities.
You might want to check the egr valve to be sure that it is not hung up slightly ajar. Spray some WD-40 on the stem of the valve and move it back and forth by means of a screwdriver inserted in the slot that goes around the stem.
Other than that, it could even be any sensor that is reading wrongly but not so badly as to set a code. To see if that were the case you would need a Chrysler DRB-II which would tell you the readings on all the sensors and compare those to what is expected. I had MAP sensor fail once in that manner (no start/no codes) and that is how it was ultimately diagnosed.
Please 'rate' my answer, and thanks for the ratings/nominations already done. You can do those again if this answer seems helpful.
Roland
