Engine chugs after letting off throttle

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Aug 31, 2022 | 08:36 PM

Stewy16

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8th Gear

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Engine chugs after letting off throttle

I have a 2000 f250 7.3 with stock injectors and turbo and hydra tune done by a local shop. When I step on it pretty good on performance tune and then after I let off the throttle it chugs like it’s about to die. I don’t think it’s a turbo fart. It’s more like the engine feels like it’s about to die. It idles normal after 5-10 seconds.

also the power doesn’t seem to come on very quick compared to some issues of my friends trucks with similar build.

any ideas on what is causing that would be great.

Last edited by Stewy16; Aug 31, 2022 at 08:52 PM.

Aug 31, 2022 | 09:39 PM

RacinJasonWV

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From: WV

Hi Stewy and welcome to the forum.

I’d start by getting a way to monitor ICP. Look in the tech folder sticky thread for an entire section on FORScan.
https://www.ford-trucks.com/forums/1...ch-folder.html

Throttle tip in feel can vary greatly depending on your setup. What all has been done to the truck? Stock turbo?
Leaky uppipes would be a first guess along with potential boost leaks. Either of those will kill performance. But first let’s get this off throttle stumble sorted out.

Sep 1, 2022 | 12:33 AM

Stewy16

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I’ll look into monitoring ICP. I’m new to diesels altogether so I’m trying to take it one step at a time. Is there an obd2 scanner you suggest? I am wanting to build up this truck to be a good tow and daily driver.

I put a new stock turbo in a few months ago and I don’t seem to be having boost leaks but I will check that.

I’ll try to add a video of the truck doing what I described in the original post.

Sep 1, 2022 | 02:41 AM

aawlberninf350

It's a Van Gogh

Joined: Feb 2010

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From: Elk Grove, CA

Best combo these days to read codes and monitor sensors is the FORScan app on your android device plus an OBDII adapter,

cheap

if you're lucky or https://www.obdlink.com/products/obdlink-lx/ if you want tools to work w/o question.

When you replaced the turbo did you put in new up pipes?

Few better trucks for tow and DD duty, good choice! Well worn pathway of mods for that service and everyone here can help.

Pics of the new rig always gets folks excited.

Sep 1, 2022 | 07:17 AM

FordTruckNoob

FTE Chapter Leader

Joined: Jan 2005

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From: Henderson, NV

I agree with the others on the need to log ICP. Once you have data, plug it into PID Charting Tool found in the stickies at the top of the forum.

My initial guess without details that you have a sticky IPR.

Sep 1, 2022 | 09:50 AM

RacinJasonWV

Lead Driver

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From: WV

Quote:

Originally Posted by FordTruckNoob

My initial guess without datais that you have a sticky IPR.

That was my thought as well but I was trying not to be too bold with my guesses. Two goobers agree so it must be true.

Sep 1, 2022 | 10:33 AM

Stewy16

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I will probably just get the good OBDII connector. I hate buying crap they may or may not work right. Also, I don't have any android devices. Is there something that will work on IOS or should I just go with a laptop configuration?

Im headed out of town for the weekend but will try to get some vehicle data together next week to share as well as some pictures.

Thanks all.

Last edited by Stewy16; Sep 1, 2022 at 10:36 AM.

Sep 1, 2022 | 12:44 PM

RacinJasonWV

Lead Driver

Joined: Jul 2017

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From: WV

I ordered this one for use with iPhone. It’s not been connected to the truck yet but does work with my other vehicles using their included app. I had plans for this which included leaving connected to one of my vehicles which is why I opted for the more expensive model. This one sleeps and does not drain battery.
OBDLink MX+ OBD2 Bluetooth Scanner for iPhone, Android, and Windows https://a.co/d/j5a8z53

Sep 1, 2022 | 04:40 PM

#10

Stewy16

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Can I get Icp reading on my edge insight cts3?

Sep 1, 2022 | 04:42 PM

#11

RacinJasonWV

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From: WV

Quote:

Originally Posted by Stewy16

Can I get Icp reading on my edge insight cts3?

Yes.
I think there’s even a way to save a data log, which may be plot-able, but I’ve never done it.

Sep 11, 2022 | 10:57 PM

#12

Stewy16

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Replaced some parts

Replaced Icp ipr ebp tube and sensor and wires in a new plug to the driver side valve cover harness. Issue went away. It also feels like I’m getting more low end power. I wasn’t able to run the truck and record icp but there was a code that indicates fault on icp.

now I’m going to replace up pipes to see if I can get egt down a bit. And starting to think about some more clean up I can do to make it even better.

Sep 11, 2022 | 10:58 PM

#13

Stewy16

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Transmission shifts better

Replacing those parts has also smoothed out my shifts a ton. The ebp tube had some huge holes in it. I’m guessing that was part of the problem.

Last edited by Stewy16; Sep 11, 2022 at 10:59 PM. Reason: Spelling

Sep 12, 2022 | 01:33 AM

#14

aawlberninf350

It's a Van Gogh

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From: Elk Grove, CA

Those parts count for 93.6% of a well running 7.3, so you nailed it brudda!

If your uppies are OEM they need to be replaced.

Sep 15, 2022 | 11:10 AM

#15

Stewy16

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Seems like everything was just about perfect for a week. Went out this morning and the truck wont start. Scan tool is scheduled to get here in about a month so that wont help me today. Feels like the truck is building up pressure like its about to start and then looses it and then empty cranking. Could this be Cam Position Sensor issue? Seems like when I fix one thing the weak link shows up. somewhere else.