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ruff92
Dodge Dakota
JOIN HERE
6/26/2008
20:22:04
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 Subject: 92 3.9 won't start when hot
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Message:
Changed pickup in distributor, distributor cap, sparkplug wires,coil, sparkplugs. Checked all the grounds I could find. Checked Pin 5,11,12, on PCM. Using Haynes wiring diagram. When hot I have voltage across the ASD relay coil, but not the fuel pump relay coil (when I try to start it.) Also changed the coolant temperature sensor. Ignition switch goes to A21 splice and then to ASD and Fuel pump relays. I checked the splices I could find (the ones everybody mentions). Did I miss the A21 splice? It looks like the relays use a common ground. I have switched all the relays around.
When engine is cold starts right up and will run good until you shut it down and let it sit for a few minutes. Then it won't start until it cools off. On a real hot day that could be a while.
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J and J Auto
GenII
6/27/2008
03:20:19
|  RE: 92 3.9 won't start when hot
IP: Logged
Message:
next time it don;t start pull a spark plug
and see if its
wet- losing spark
dry- losing fuel
Than you will know what to look for
There is a splice that goes bad about a foot back
from the power dist box under hood in the harnas
a red wire going to 3 others remove splice
and solder all to gather
check
pin 3 pin 9
1 power all the time
1 on off with key
Larry
J&J Auto
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Bob Lincoln
Dodge Dakota
JOIN HERE
6/27/2008
08:13:35
| RE: 92 3.9 won't start when hot
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Message:
Probably a splice. But did you check fault codes? That's always the first step.
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ruff92
Dodge Dakota
JOIN HERE
6/27/2008
12:30:18
| RE: 92 3.9 won't start when hot
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Message:
Thanks for the info guys. It does not set a code. Also when it doesn't start, it does not energize the ASD and Fuel pump relays. Looking at other posts stated that if no distributor signal received by PCM-ground will be removed from the ASD pin 51 and that would keep fuel pump and ASD from being energized. Also if ASD not energized battery voltage is not supplied to the ignition coil. I did check pins 3 and 9 ok! I did resolder a splice that was I think 3 red/white wires. It was just to the right side of relay box. Also, can anyone tell me what the crankshaft position sensor does in all this.
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ruff92
Dodge Dakota
JOIN HERE
6/27/2008
12:32:44
| RE: 92 3.9 won't start when hot
IP: Logged
Message:
Thanks for the info guys. It does not set a code. Also when it doesn't start, it does not energize the ASD and Fuel pump relays. Looking at other posts stated that if no distributor signal received by PCM-ground will be removed from the ASD pin 51 and that would keep fuel pump and ASD from being energized. Also if ASD not energized battery voltage is not supplied to the ignition coil. I did check pins 3 and 9 ok! I did resolder a splice that was I think 3 red/white wires. It was just to the right side of relay box. Also, can anyone tell me what the crankshaft position sensor does in all this.
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fotodak
Dodge Dakota
JOIN HERE
6/27/2008
13:42:12
| RE: 92 3.9 won't start when hot
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Message:
I am chasing the very same problem except mine won't start at any time.
I have no spark and all the symptoms are the same.
I replaced ECU because before it quit it was overcharging.
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fotodak
Dodge Dakota
JOIN HERE
6/27/2008
16:11:36
| RE: 92 3.9 won't start when hot
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Message:
ruff, the only thing you haven't replaced is the crank position sensor. I bet it gets hot and goes south. I'm replacing mine this weekend. only $30, what have I got to lose?
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trev1
Dodge Dakota
JOIN HERE
6/27/2008
16:34:09
| RE: 92 3.9 won't start when hot
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Message:
Mabee you got a bad coil? Even though you just replaced it it can still be bad. I was having a similar prob on my 92. Chased it and chased it. I finally got p-off and replaced the coil again. I fired right up!!! No prob sinse then...
Just an afterthought...
No fuel, means no fire then it wont run...
No fire, means no fuel then it wont run...
Thats where I was for a long time...
Trevor in SWMO
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ruff92
Dodge Dakota
JOIN HERE
6/29/2008
13:48:24
|  RE: 92 3.9 won't start when hot
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Message:
Just a hopeful report. So far it looks good. Replaced the Crank Position Sensor. Easy to do on a 92. No intentional rhyming. Have run it until hot, then shutdown and let cook, several times. Still looking good. Sensor prices run from 56.99 (lowest) up to 110.00. There is a large price difference between manual tran and automatic. Manual is higher.
Thanks for the interest shown
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