99 Ram 1500 Shut down during driving
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Joined: Jun 2011
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99 Ram 1500 Shut down during driving
I have a 99 Ram 1500, 5.9l, gas 2 wheel dr, auto tranny. In the last year I've replaced distro cap, rotor, wires, plugs, Crank snesor, pre-cat O2 sensor, cat, and Idle Air Contoller.
Vehicle runs fine first thing in the morning. After about 40 miles and it gets good and warm the engine shuts down, speedometer dropps to 0 but all gauges to include tac stay at current reading. I stop, turn key off and all gauges peg to 0 and truck will not restart. I thought coil was getting hot, but no gauges getting juice but all dummy lights come on. I did try using a screwdiver in a plug wire, no spark arc when I crank engine. Engine cranks and getting fuel but have not checked fuel pressure since I know I'm not getting any fire to gauges.
I've giggled, moved, swapped out relays in distro box and nothing. The only thing that seems to fix it is when I leave the key on and pull the number one connector from computer, then plug it back in I hear the ASD relay kick in, the bell tone rings since key is on, and it will start up fine. It will run a couple miles and go thru the same scenario.
It doesn't matter if the AC is on or off, still happens.
When it shuts down, it throws a 505 code which is the idle air controller. I've replaced the IAC and for some reason the plunger will not stay adjusted at less than 1 1/8". I adjust it, intall it, and after this scenario I pull the controller and it has lengthened to be over 1 1/8". I've tried controllers from both Auto Zone and Advance Auto. After I adjust the plunger, install, remove code it will run fine and no code.
When shut down happens, code comes back up but I can't beleive this would cause an entire shutdown during driving with no fire going to gauges. I am not getting a "no buss" on odemeter either. But something is causing the PCM to either lose ground or send false signal from somewhere.
Any ideas would be grateful.
Scuba Sam
Vehicle runs fine first thing in the morning. After about 40 miles and it gets good and warm the engine shuts down, speedometer dropps to 0 but all gauges to include tac stay at current reading. I stop, turn key off and all gauges peg to 0 and truck will not restart. I thought coil was getting hot, but no gauges getting juice but all dummy lights come on. I did try using a screwdiver in a plug wire, no spark arc when I crank engine. Engine cranks and getting fuel but have not checked fuel pressure since I know I'm not getting any fire to gauges.
I've giggled, moved, swapped out relays in distro box and nothing. The only thing that seems to fix it is when I leave the key on and pull the number one connector from computer, then plug it back in I hear the ASD relay kick in, the bell tone rings since key is on, and it will start up fine. It will run a couple miles and go thru the same scenario.
It doesn't matter if the AC is on or off, still happens.
When it shuts down, it throws a 505 code which is the idle air controller. I've replaced the IAC and for some reason the plunger will not stay adjusted at less than 1 1/8". I adjust it, intall it, and after this scenario I pull the controller and it has lengthened to be over 1 1/8". I've tried controllers from both Auto Zone and Advance Auto. After I adjust the plunger, install, remove code it will run fine and no code.
When shut down happens, code comes back up but I can't beleive this would cause an entire shutdown during driving with no fire going to gauges. I am not getting a "no buss" on odemeter either. But something is causing the PCM to either lose ground or send false signal from somewhere.
Any ideas would be grateful.
Scuba Sam
Professional
Joined: Aug 2010
Posts: 204
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From: Corpus Christi, TX
Try checking all the grounds, pay attention to the one that goes to the power steering pump. I would also get the IAC from the dealership. I have zero luck with that from the local parts stores.
Administrator
Joined: Apr 2010
Posts: 87,362
Likes: 4,209
From: Clayton MI
There is no adjusting the IAC. Install it, reset PCM, start truck. PCM will automatically re-zero a selection of sensors. (IAC being one of them.)
If doing a PCM reset will make it start and run again..... might try swapping it with a junkyard unit, and see if the problem goes away. Sure sounds like something is getting hot, and stops working.
If doing a PCM reset will make it start and run again..... might try swapping it with a junkyard unit, and see if the problem goes away. Sure sounds like something is getting hot, and stops working.