[Tathag]

I'm not sure if my issue is resolved yet either Last time it went 4 months without acting up. I swapped out the IPR on August 25th, so in 5 more months, i'll let you know

-jokester

Do you still have an egr?

 

[jokester00]

Do you still have an egr?

I'll keep an eye on the PID you mentioned.

-jokester

 

[bismic]

Look at it this way - if the problem pops up again, you will have another good reason to buy more tools!

 

[jokester00]

Well, it didn't take 4 months this time 🤣

Hey @Tathag - no, the IPR did NOT fix my issue.

Today I was driving with steady throttle and the truck revved up like I pressed the skinny pedal. Hmmm...that was odd. Well, later on tonight, it lunged again with my foot nowhere near the skinny pedal, and on the way home tonight. The surging or lunging usually preceeds the erratic idle thing, so I knew it was just a matter of time. Tonight on the eay home from the kiddo's soccer game, it started with the erratic idle thing.

Well crap...time to start fishing for answers again. Gonna check out the ICP pigtail connections tomorrow (changed it out ~2 years ago). Might even change it out because I have one here at the house.

GRRRR...I hate intermittent problems!

@bismic @Hydro @TooManyToys @FordDoctor gitchur thinkin' caps back on 😁

-jokester

 

[Tathag]

Well, it didn't take 4 months this time 🤣

Hey @Tathag - no, the IPR did NOT fix my issue.

Today I was driving with steady throttle and the truck revved up like I pressed the skinny pedal. Hmmm...that was odd. Well, later on tonight, it lunged again with my foot nowhere near the skinny pedal, and on the way home tonight. The surging or lumging usually preceeds the erratic idle thing, so I knew it was just a matter of time. Tonight on the eay home from the kiddo's soccer game, it started with the erratic idle thing.

Well crap...time to start fishing for answers again. Gonna check out the ICP pigtail connections tomorrow (changed it out ~2 years ago). Might even change it out because I have one here at the house.

GRRRR...I hate intermittent problems!

@bismic @Hydro @TooManyToys @FordDoctor gitchur thinkin' caps back on 😁

-jokester

So I had mentioned the EGR valve, but what I found is that mine was cutting out and specific temp 196-198. I had an old wiring harness that I was going to overlay just to wires to the egr valve. When I cut into the old harness I found that where the harness routes in front of the oil filter, all wires were stuck together and hard. I ended up wrapping my current harness in heat sheild and my egr magically is working. It's been a week so far, I do still have the erratic idle but it's less and is pointing me in the direction of harness issue from heat. I have come across a relocation kit for the icp sensor( basically a hose that pulls the sensor away from the turbo heat.) I may try that as well when I get another harness.

 

[Hydro]

@jokester00 sounds to me like there is an induced ground to your IPR, causing it to randomly close and raise the pressure

A shorted wire inside the harness is a likely culprit -- that heat plays havoc on the insulation as @Tathag mentioned

 

[bismic]

 

[jokester00]

@jokester00 sounds to me like there is an induced ground to your IPR, causing it to randomly close and raise the pressure

A shorted wire inside the harness is a likely culprit -- that heat plays havoc on the insulation as @Tathag mentioned

If that's the case, to prove that theory, I could unplug the ICP sensor and run it like that for a few days and it shouldn't have any effect on the IPR because it would be using inferred values, correct?

-jokester

 

[bismic]

I think he is saying the issue could be somewhere in the IPR wiring.

 

[jokester00]

I think he is saying the issue could be somewhere in the IPR wiring.

I agree with him. However, running with the ICP disconnected should prove his theory, correct? By disconnecting the ICP sensor. You take the ICP out of the equation and it runs off inferred values from the PCM. If the issue happens again with ICP disconnected, the ICP is no longer in the equation, so it's IPR based off inferred, not ICP.

-jokester

 

[bismic]

If the IPR wiring is the issue, then the command (PWM voltage) to the IPR valve gets "corrupted" (lack of a better word) whether it is getting a signal based off of an actual ICP or an inferred one.

 

[jokester00]

If the IPR wiring is the issue, then the command (PWM voltage) to the IPR valve gets "corrupted" (lack of a better word) whether it is getting a signal based off of an actual ICP or an inferred one.

Pretty sure we're speaking the same language here, just differently I completely agree with what you're saying. That's what I'm trying to rule out.

-jokester

 

[Hydro]

Thing is the IPR circuit will not throw a code, that I am aware of -- you may have a ground side problem, with a shorting wire -- hot side is fused, but with an intermittent it may not blow the fuse but still affect the solenoid position -- disconnecting the ICP still leaves the IPR problem active -- watching the ICP when the problem may show a erratic rise in pressure (voltage)

Would be great to have a separate PWM box to totally eliminate the PCM for a while as a test -- would not be difficult to build, I just don't have the time right now with Fall Farm chores -- 400 MHz , 12 volt PWM

 

[jokester00]

Well, true to form, I got out the laptop, hooked up Forscan and drove around for 1.5hrs burning $5.79/gallon fuel with nothing to show for it but 3/8 of a tank instead of 1/2. Stupid truck didn't even hiccup. 🤣

-jokester

 

[Hydro]

All fixed, ...just leave the laptop connected each time you drive

 

[Tathag]

Well, true to form, I got out the laptop, hooked up Forscan and drove around for 1.5hrs burning $5.79/gallon fuel with nothing to show for it but 3/8 of a tank instead of 1/2. Stupid truck didn't even hiccup. 🤣

-jokester

If it wasn't for the harness being $464, it would be easy to replace it on a guess.

 

[jokester00]

All fixed, ...just leave the laptop connected each time you drive

You forget where I live...if I did that, I'd have a broken window and a stolen laptop to go with my intermittent truck issue 🤣

-jokester

 

[Tathag]

This is my next repair when I get around to swapping the harness. Putting sensors and even a ficm for that matter next to all that heat is just crazy to me.

 

[bismic]

I agree with you on the ICP. The FICM, when properly soldered, with quality components, just isn't an issue - IMO.

 

[Tathag]

I agree with you on the ICP. The FICM, when properly soldered, with quality components, just isn't an issue - IMO.

When I swapped my power supply with the bulletproof one, I loosened the cover plate and quite a bit of hot air escaped. Granted the truck had only sat for an hour but I would have put that in the cab. I spoke with ED from Ficmrepair and he said they were actually working on a relocation kit but it's alot more work then it seems.