Mechanics

WHY DOES ENGINE DIE

1995 Dodge Truck

Engine Performance problem
1995 Dodge Truck V8 Four Wheel Drive Manual 134000 miles

Vehicle starts and rev's up fine. Upon putting it into gear and placing torque upon the motor while driving, the engine dies. Have replace PCM, crank sensor, cam sensor, plugs, wires, cap and rotor, and coil. Engine is a 5.2. Upon shutting off key, the engine will restart and process starts all over. The more the process is repeated, the sooner the engine dies. There are no codes. It seems the crank sensor looses signal shutting of ASD relay.
If you have question.970-879-5476

" UPDATE" Flashing codes found, 21, then 55
Avatar
Reesbb
April 1, 2010.



So when it dies, have you tested for spark? Gas? And is the check engine light on? If yes try this, hell try this anyway!
Is your check engine light on? If yes turn the key from off to on three times, on the fourth one leave it in the on position, count the flashes.22 would flash as 2 blinks, then a short puase, then 2 more blinks. If several codes are stored, the pause is longer between codes, code 55 will be the last code. Do this and post all codes found.

Merlin2021
Apr 2, 2010.
My 1997 5.2 Dodge dies at idle as well. Using the on-off-on-off-on the check engine light spit out this. One flash, long pause, two flashes, long pause, two flashes, long pause, five, pause, five, pause, six. 1, 2, 2, 5, 5, 6. Was confused with the six because it does not correspond to anything. Maybe it is read as a 5. 12 is battery disconnect, 25 is IAC Idle air control. But we replaced both the IAC, and TPS sensors yesterday. Also the ping/engine knock is bad--sounds like a diesel under throttle.
UPDATE** SO I read codes as 12, 25, 55. I tried it with MAP disconnected and it idled well for a minute. Now I got code 14 added which is MAP voltage out of range so computer sensed that change.
Restart and it stalls every single time now. There is nothing intermittent about it! Change dout battery to a known full charged one and no changes. Could the MAP sensor be the culprit? Maybe the new out of box IAC Sensor was junk!

Tiny
Howielones
Apr 4, 2010.
When the truck dies, there is no spark or fuel. We suspected the ASD relay and changed it. No avail. Only flash codes available 12 & 55. Unpluged TPS sensor, no affect. Unpluged MAP sensor, no affect.

Tiny
Reesbb
Apr 5, 2010.
21 = O2 sensor, try replacing it, when it comes online" closed loop" bad O2's can cause a kinds of drivability problems. At 134,000 it's overdue!

Merlin2021
Apr 5, 2010.
It is code 12 not 21, and even with a bad oxygen sensor it would run. The code 12 merely told us we had the battery unhooked when we changed out a broken battery end

Tiny
Reesbb
Apr 5, 2010.
I have seen bad O2 sensors kill engines just as yours is being killed, it will send a shock to the PCM. Then with that kind of treatment, it dies! I thought I read 21 sorry. Un hook the sensor and drive it, see if it helps. Replace it if it does.

Merlin2021
Apr 5, 2010.
We found the problem. There was a short in the speed sensor comming off the t-case which was in turn affecting the PCM which was in turn shutting down the ASD relay. We found this by putting the vehicle on the lift and running it in 2WD and the vehicle ran fine. We then put it in 4WD and the spinning of the front tires killed the engine. Knowing that we were not running down the road in 4WD, it had to be the rotation of the front wheels. Long story short, the wire was rubbing on top of the front drive shaft where no one could see it. Thanks for you help

Tiny
Reesbb
Apr 5, 2010.
Ok Good work!

Merlin2021
Apr 7, 2010.