1995 Dodge Ram Engine shuts down when hot

TIMGALLA

MEMBER
1995 DODGE RAM
V8
4WD
AUTOMATIC
241,000 MILES

After driving about 45 minutes the engine will just shutdown and will not restart. If I let it cool off about 30 minutes it will restart and drive again for a little while. Seems temp related but don't know how to troubleshoot since I would like be on road when it dies. I have replaced fuel pump and cam sensor in distributor. Appears thta the computer is shutting down the engine but I don't know which signal is the cause or if the computer is bad. Can you provide any information?

3 Replies

SATURNTECH9

MECHANIC
30,869 POSTS

First of all thank you so much for your donation.What model ram truck do you have?I also need to know when the car stall's and won't start if your loosing spark or fuel or both?So next time it stall's i need you to check for spark at least.If you could get it to stall at home then you could see what your fuel pressure is when it stall's and won't start.Also need to know what size engine you have?Also see what code's you have if any i posted how you can do that.

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Friday, August 13th, 2010 AT 1:41 PM

TIMGALLA

MEMBER
2 POSTS

Thanks for quick reply. Truck is 1995 Dodge RAM 2500 5.9L automatic 4x4. I just replaced fuel pump second time last weekend since it was still under warranty and same problem as before. I am thinking no spark since I did find that condition once. Hence I am thinking that some sensor signal to PCM is shuting down the ignition system. But how to capture which one I don't know. I mean I am old electronics person and mechanic but have never had to deal with a PCM type issue. I know when truck is dead some signals seem to be grounded at PCM but since engine not rumming I don't know if signal should be high or low normally. I should check when it is running.
Can't read all your code check screen but I know how to do that. I believe I have codes 23, 72, 56. Not sure how old they are since I don't know how to clear them and I don't have a code checker for this truck.
Thanks much for all help, Tim.

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Friday, August 13th, 2010 AT 7:40 PM

SATURNTECH9

MECHANIC
30,869 POSTS

I found the code 23 that is ambient temp sensor high voltage.I couldn't find the other two 56 and 72. Let's do this when it doesn't start check and see if we have spark you just have a bad coil that doesn't spark when it get's hot.

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Friday, August 13th, 2010 AT 7:55 PM