Mystery ...
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Correct definition for KOER Code 538: Insufficient RPM change during KOER dynamic response test/ Operator error
Run the Key On Engine Off (KOEO) tests and Stored Code display. There is a code for erratic PIP signal.
Since the problem is happening more often now you have a chance to verify if you are losing spark or fuel.
Run the Key On Engine Off (KOEO) tests and Stored Code display. There is a code for erratic PIP signal.
Since the problem is happening more often now you have a chance to verify if you are losing spark or fuel.
5th Wheeling
Joined: Mar 2018
Posts: 26
Likes: 0
In my case it turned out to be the pip, and I just went ahead and replaced the whole distributor. If when you are trying to re-start you never hear the fuel pumps run for a couple seconds, then it's a good idea to check the ecm and see if any capacitors are leaking. Keep us posted. Plenty of smarter people than me to help.
Thread Starter
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Tuned
Joined: Apr 2013
Posts: 263
Likes: 7
From: Upper midwest
Pulling the distributor
Looks like the whole distributor needs to come out to do the PIP sensor.
Tips? Also the parts store did not call it a PIP sensor. Some kind of ignition coil? I may have misheard that one.
Tips? Also the parts store did not call it a PIP sensor. Some kind of ignition coil? I may have misheard that one.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
5th Wheeling
Joined: Mar 2018
Posts: 26
Likes: 0
This should be what you need:
https://www.oreillyauto.com/detail/b...2FStator&pos=0
https://www.oreillyauto.com/detail/b...2FStator&pos=1
Thread Starter
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Tuned
Joined: Apr 2013
Posts: 263
Likes: 7
From: Upper midwest
...
Sweet. Thanks guys.
Oreilly's said there are 2 kinds of gears on the distributors. And they are NOT interchangeable.
How do I know which kind I need? One is cast iron or something??
Oreilly's said there are 2 kinds of gears on the distributors. And they are NOT interchangeable.
How do I know which kind I need? One is cast iron or something??
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
One is cast iron and the other is steel. There are several ways to possibly determine which one you have, but I read, the 94 it could be either. I read that most people just use the gear off the old distributor to be sure. The changing of distributor gears is interchangeable. Sandy
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Thread Starter
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Tuned
Joined: Apr 2013
Posts: 263
Likes: 7
From: Upper midwest
Plan
Plan is to pull the distributor.
Pull the gear. Change the pip.
Or replace the whole thing if the gear is really stuck & if a machine shop is out of price range.
I'll PB that gear a few minutes before pulling it off.
Pull the gear. Change the pip.
Or replace the whole thing if the gear is really stuck & if a machine shop is out of price range.
I'll PB that gear a few minutes before pulling it off.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Hope it works out. I don't know your skill level. The distributor needs to go back in a certain way. Plenty of You Tube stuff on our trucks. Sandy
Thread Starter
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Tuned
Joined: Apr 2013
Posts: 263
Likes: 7
From: Upper midwest
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Thank you Sandy. My skills are moderate. Have taken old engines & trannies apart to see how they work. Lots of wrenching while installing pumos, alternators, & such. My skills lack in the timing dept. Know how to get it out, but must take special consideration to mark EVERYTHING. As to not screw up the timing.
Have watched buddies install them 180° off. More than once. Oops.
Just so long as the oil pump drive shaft doesn't come out with it. And the PIP switchs goes OK. I hope to be driving it again this weekend.
Embarrassing to have my truck sidelined. Been moving a ton of rock. A few hundred lbs @ a time in my GF's minivan! :P
Have watched buddies install them 180° off. More than once. Oops.
Just so long as the oil pump drive shaft doesn't come out with it. And the PIP switchs goes OK. I hope to be driving it again this weekend.
Embarrassing to have my truck sidelined. Been moving a ton of rock. A few hundred lbs @ a time in my GF's minivan! :P