1997 7.3 Powerstroke runs rough/misses (only some times) - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 07-06-2011, 08:04 PM Thread Starter
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1997 7.3 Powerstroke runs rough/misses (only some times)

Dear fellow PowerStroke owners,
I would really appreciate any input as it relates to my confounding problem on my 1997 F-250 7.3 liter powerstroke w/auto transmission. 191,000 miles, all stock.

Problem #1 - The issue that I have encountered recently is that occasionally (and becoming quite frequent) is that while at an idle or just cruising down the road my truck will start to seemingly missfire. It will buck back and forth a little causing some driveline slap. If I accelerate hard it seems to run fine but when I let off the throttle and just cruise is persists and then sometimes just goes away. When at an idle occasionally this will start as well and then it seems to be missing or running out of fuel almost stalling but recovering itself always (so far). After it seems to sit for a short period of time it seems to go away until I drive it again for roughly 20 miles and then the whole charade starts again (but not always as sometimes within a short period of time or distance it starts again). I have recently changed the differential speed sensor, TPS sensor (mounted to accelerator pedal, which by the way was extremely hard to find as everyone wanted to sell me a complete pedal assembly), the cam position sensor and fuel/air filter yet there appears to be no benefit to this. What gives? are there any other sensors anywhere that I am overlooking?

Problem #2 - Occasionally when accelerating out of first gear it wants to hold first gear indefinitely without shifting into 2nd gear. When I let up on the throttle somewhat it seems to go into second just fine and from there shifts upwards normally. I recently had the complete transmission rebuilt (4000 miles ago) including replacement of torque converter. Any ideas? Is it possible that both symptoms from questions #1 and #2 are on the account of one problematic sensor or failing part? Please advise.

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post #2 of 4 Old 07-06-2011, 08:17 PM
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check your valve cover harness and connections. wiggle them to see if it affects the engine.

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post #3 of 4 Old 07-06-2011, 11:42 PM

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could be the filter too, isnt there a pump in the tank as well?

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Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
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Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #4 of 4 Old 07-14-2011, 02:31 PM
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problem #1- im no pro but i'd do the icp sensor next. hope that helps
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