1994 Ford E-Series Van miss

Tiny
TDENNIS21
  • MEMBER
  • 1994 FORD E-SERIES VAN
Engine Performance problem
1994 Ford E-Series Van V8 Automatic

i have a 1994 e150 van with the 5.8l v8 and it has a intermittant miss that gets worse as engine heats up.
It also seems to affect the shifting of the tranny.
I have tried plugs, wires, cap, rotor and coil-no change.
Then tried icm-no change.
Then distributor-no change.
I'v checked for vacuum leaks and flushed injectors but had no change to performance.
Snap-on solus says no historical codes and it passes koeo and koer tests.
Help would be a lifesaver.
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Friday, June 25th, 2010 AT 2:55 PM

7 Replies

Tiny
TDENNIS21
  • MEMBER
Something besides the standard textbook causes is expected on this please, I'm a mechanic myself and I know all the textbook causes and non of those are it, thats why im posting here for help.

Thank you
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Friday, June 25th, 2010 AT 3:02 PM
Tiny
CARADIODOC
  • EXPERT
Hi guys. I can offer one suggestion. Look for a plugged EGR tube. When it gets plugged, all the EGR gas goes to the last working cylinder causing a misfire. The cylinders with plugged passages work just fine.

Can't remember which years or engines this applies to although I do know it involves some with OBD2 systems that detect cylinder misfires. If my solution, application or year of vehicle are off-base, feel free to delete this post and I'll let you guys continue your conversation.

Caradiodoc
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Friday, June 25th, 2010 AT 3:12 PM
Tiny
TDENNIS21
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Any help with this is much appreciated.
The problem exists at idle with vehicle not moving as well as when driving at all speed ranges, and I'v checked the egr for correct operation and it passes, so I dont think it could be the problem.
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Friday, June 25th, 2010 AT 3:32 PM
Tiny
RASMATAZ
  • MEMBER
I'm a mechanic myself and I know all the textbook causes and non of those are it, thats why im posting here for help.

Temperature related misfiring: We're trying to help you here be patient this is not a simple problem that's the reason you came aboard, so if you know more than I do which I've been doing it for 40yrs request your refund with Mike I don't think you need our help to question our competence. Remember I'm not with your vehicle.

If you wish carry on with caradiodoc suggestions and I'll monitor the progress
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Friday, June 25th, 2010 AT 3:41 PM
Tiny
TDENNIS21
  • MEMBER
I'm not trying to be rude, sorry, but its just that i'v already checked the basic causes and I saw this problem posted on a ford forum web site but it had been spammed and the replies deleted so I know I'm not the first to post about this.

Once again, I'm sorry for coming off rude in my response.
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Friday, June 25th, 2010 AT 3:51 PM
Tiny
CARADIODOC
  • EXPERT
This EGR thing isn't something I ever ran into myself. I'm a former Dodge mechanic. The information is strictly from an old decrepit memory from some very high-level Carquest training classes taught by a fellow who runs a shop in Joliet, IL that specializes in hard to find driveability problems. Most of their customers are other shops. They have solved some really weird problems and have developed a lot of innovative diagnostic procedures. The problem with these classes is they spend a lot of time on the one car no one can solve out of hundreds that are easy fixes. A lot of the information was way over my head and included things I would never need, but I was also surprised to find that most of the mechanics in attendance knew exactly what was going on. Most of them had been keeping up with the current technology a lot better than I was an an instructor.

As best as I can recall, the EGR system introduces a measured amount of exhaust gas that is supposed to be divided up equally among the cylinders. When the tubes become plugged, the same measured amount enters but it all goes to the one or two cylinders that aren't plugged yet. That's why the EGR system appears to be working but there is a misfire. It would seem to me that would be a part of the OBD2 system on '96 models but I mentioned it in case it applies to a '94 also.

I don't think I have anything of value to add to this story as Fords and driveability aren't my areas of expertise. Just wanted to throw the EGR thing out there on the chance the problem wasn't known.

Caradiodoc
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Friday, June 25th, 2010 AT 3:59 PM
Tiny
TDENNIS21
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I appreciate your honesty.
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Friday, June 25th, 2010 AT 4:04 PM

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