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  #11  
Old 03-07-2016, 12:25 PM
Ford351c594 Ford351c594 is offline
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it is a crane energizer. The engine was rebuilt about 60k miles ago by some one else so I don't know. I know it has ran fine for a long period of time. I put the truck in self test mode with an old NGS I had and it can control the idle so I don't think the IAC is an issue.

The fuel pressure issue is interesting. it has a new front tank and sender with low pressure pump. A new pressure regulator, and a new frame mounted high pressure pump( unique part to early Ford MPI). Also a new tank switcher. All done about 7 months ago by someone who said it would fix the issue.

This truck is giving me fits!!!!!!!!!!

The fact I don't know all of its history is just insane.

Some of the few things I have done are:

II replaced the EGR solenoids. I also replaced the egr position sensor to clear egr codes which did happen. The egr sensor was new as well at the time I replaced it. The solenoid was open and the position sensor was reading .97volts closed. I believe it is supposed to be approx. .6volts.

It also had TP codes, but it was adjusted wrong and I fixed that as well. Reading .81volts at idle now.

He told me he thinks they installed a new PCM as well. I found the receipt for that from O'Riely's in the glove box.. so yes.

Last edited by Ford351c594 : 03-07-2016 at 01:15 PM.
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  #12  
Old 03-07-2016, 03:42 PM
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simplyconnected simplyconnected is offline
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I am not one who throws new parts at a problem because it complicates matters to no end. Sometimes it causes problems move to other areas, especially while troubleshooting.

I use sound troubleshooting techniques as I go through each section, looking for known results. For instance, you can change all the EGR parts you want but if carbon has blocked off exhaust gas flow, the system will simply not work. Conversely, if the EGR is stuck open, the engine leans out causing terrible idle. I look for ~0.5volts on the Throttle Position Sensor, then watch it go to 4.5 at Wide Open Throttle. Body grounding is also important.

Troubleshooting from this chair turns into a guessing game that is impossible to do. You need to understand each function and then test. For example, a good running EGR doesn't work at all until the car is RUNNING down the road in drive. You can check for vacuum leaks in the garage but that's only a partial story.

Watch this youtube video, all three parts: CLICK HERE
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  #13  
Old 04-13-2016, 10:00 PM
Ford351c594 Ford351c594 is offline
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it was the fuel injectors. I believe from 86 to 89 ford used single pintal exposed fuel injectors. super common to failure. (left side)

I replaced them bosch 4 hole injectors that have the pintal protected from egr and pcv and it runs beautiful. flow matched set remanufactured only costed 149 bucks.
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  #14  
Old 04-13-2016, 10:19 PM
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Glad you found the problem. Don't forget to change your fuel filter.
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  #15  
Old 04-14-2016, 09:38 AM
Yadkin Yadkin is offline
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Thanks for the update!
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  #16  
Old 04-14-2016, 10:47 AM
OX1 OX1 is offline
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I looked at that thread. Don't write-off ford truck message boards because of that guy. I've had run-ins with that guy on fullsize and early broncos message boards. Lets just say he is pretty smart and well versed, but he also thinks he knows everything and is pretty arrogant at times.

Glad to see you figured it out. Had a set of inj on my dads hotrod (mild blower, 5.0 HO) that would not allow cold start. Ran perfect otherwise, but several of the inj were upwards of 26% down in flow. I even did a cyl balance test on that passed all three sections (which you would think if an inj was that far off, the force it produces at idle for that cyl would be different than the other cyl's).
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Old 04-15-2016, 11:50 PM
Ford351c594 Ford351c594 is offline
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Quote:
Originally Posted by OX1 View Post
I looked at that thread. Don't write-off ford truck message boards because of that guy. I've had run-ins with that guy on fullsize and early broncos message boards. Lets just say he is pretty smart and well versed, but he also thinks he knows everything and is pretty arrogant at times.

Glad to see you figured it out. Had a set of inj on my dads hotrod (mild blower, 5.0 HO) that would not allow cold start. Ran perfect otherwise, but several of the inj were upwards of 26% down in flow. I even did a cyl balance test on that passed all three sections (which you would think if an inj was that far off, the force it produces at idle for that cyl would be different than the other cyl's).
yep, he is smart and knowledgeable, but calling him arrogant is a complement. I believe he is banned now from the bronco forum..... he is only on the F150 forums now. I knew it was going to be bad when I didn't decode the vin up to his standards, and when I called him on it in a very suddel way, he said I was just scratching the surface of the vin decoding. I mean I told him it was a 86 Fuel injected 150 with a 5.0 not much more you need to know about it.

I didn't have the hart to tell him I serve on Ford TRP panel as being recognized as one of the top 20 techs in the nation. So yes I know how to use a meter........... He can just assume I am dumb. Its easier that way some times..... lol
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