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Old 03-01-2020, 06:57 PM   #1
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Replace MAP Sensor on 1999 International 3800

I've been fighting with my 3800's engine since the drive home from the dealer.

Issue seems fuel system related; it only presents when climbing steep hills, symptom is a pulsing throttle, you can watch the RPMs increasingly start twitching more and more.

A new fuel regulator/pump/filter + new o-rings on my injectors, same issue.

Mechanic now thinks it is a bad map sensor. Should be a cheap part ($90-100), and he states it is easy to replace. Unfortunately, the drive out to replace it is $650. I "think" I found the part online; but I can't for the life of me find it on the bus. If it is easy to replace, I can do it myself.

Does anyone have a picture of what the dang thing looks like, and where it is? And is this: https://www.tamerx.com/icp-ebp-senso...rt-isk955.html it?

Thanks!
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Old 03-01-2020, 08:53 PM   #2
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Very easy to do. It's right on top of your valve cover/manifold. But the issues you're experiencing, are they happening all of the time? Or when the engine is cold? Warm? Engine under load going uphill? Describe your problem more and someone may be able to help you diagnose it.
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Old 03-02-2020, 10:46 AM   #3
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I can't really say whether it ONLY happens when the engine is warm since it takes a while to get to the hill where I can reliably get it to happen 100% of the time.

I've noticed the behavior a few times when not climbing a steep hill, but EVERY time I climb the one steep hill by my house it happens. I have driven it 30 minutes or so up moderate hills and on flat without it doing it.

There is a video of it doing its thing here: https://youtu.be/5-uxGKDqN7o
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Old 03-02-2020, 02:49 PM   #4
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Did you change just one fuel filter or two?

Some on here have found out the hard way that they have 2 filters, they just didn't look hard enough to find and replace the 2nd the first go around. Check on the frame rails all the way back to the tank for another one.
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Old 03-02-2020, 03:41 PM   #5
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are we sure its the engine and not the transmission slipping or hunting up and down?
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Old 03-02-2020, 03:54 PM   #6
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Short answer is I'm not sure of anything. However, it has been in the shop 3 times (industrial diesel shop) and worked on by people with a lot of experience with this exact engine; so I guess I would be pretty surprised if they missed an entire filter before recommending a new fuel pump/regulator/o-rings. I'm certainly not aware of a second fuel filter on this engine.

It doesn't "feel" like the transmission to me, since I can drop it into low and have the same thing happen; but clearly if I knew what it was I wouldn't be posting here. (Please, please, please let it NOT be the transmission).
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Old 03-02-2020, 04:05 PM   #7
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Have you checked the fault code with the button next to the diagnostic connector? If so what code(s) did you get? The MAP sensor should be on top of the valve cover like rensch26 said and is easy to access.
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Old 03-02-2020, 10:46 PM   #8
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Are you referring to the diagnostics port under the steering wheel?

I don't have a reader to read those codes and none of the shops in my town have the older style reader either. I guess I should probably buy one.

I know it threw a code while it was in the shop; not sure what it was, but clearly wasn't conclusive enough to key in the mechanics. I'll have to ask if they wrote it down.
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Old 03-02-2020, 11:06 PM   #9
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I have a Thomas 3800 with a DT466E and think yours would be similar. Next the diagnostic port there is a small button. I can turn the ignition switch on (but not crank the engine) and press the button until the dash lights give me a 3 digit code. I videoed the dash as it flashed out the codes so it was easier to refer back to. On mine it's the Warn engine light that gives the code and each code is separated by the oil/water light.
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Old 03-03-2020, 09:43 PM   #10
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Thanks, I'll check it out and see if I can get any codes. Will report back.
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