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Old 03-07-2018, 03:02 PM   #1
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1998.5 isb map sensor location

Trying to locate map sensor on 1998.5 isb 275
And are they easy to remove
Could be my problem with lack of power uphills
Worth replacing
Any input would be appreciated
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Old 03-07-2018, 04:46 PM   #2
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It takes a 32 mm (1 1/4") deep socket to remove/replace.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-07-2018, 04:59 PM   #3
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My question would be do you have a DTC code? If the sensor is bad, or reads out of spec, it should have a check engine light on.

Do you have access to any diagnostic/scan code reader? Many will show live data and you'll be able to see what sensor is reading. Cummins quickserve will have diagnostic test procedure for the sensor as well...

Perhaps describe low power issues, maybe we can figure it out here
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
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Old 03-08-2018, 02:01 AM   #4
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Iíve had new injector pump new lift pump
New turbo and new manifold
Took motorhome out and it was a little underpowered going up hills
Checked for leaks
I did have a leak at inlet to lift pump fixed that but havenít had her out yet unsure if that was the problem
But have been told could be map sensor
No codes are coming up
Donít seem to be getting full turbo boost
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Old 03-08-2018, 02:39 AM   #5
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I donít know if this would affect turbo boost
But when I put the rad and cac back in I didnít seal around the tops and side of radiator
So a lot of air was blowing over the top and sides
Would this affect boost
Mines a rear radiator
I have now sealed all around the radiator so the air goes through the middle
Havenít taken her out yet
Can that have caused low boost
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Old 03-08-2018, 09:12 AM   #6
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Not unless the air leaking around the radiator was from the inner cooler. If the engine was overheating it might derate the engine, but I'd think you would see that on the temperature gauge.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-08-2018, 09:30 AM   #7
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Just replaced that check engine light, but had a no start problem.....that sensor is also the boost sensor.......and there was a code stored......code was PO 237
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Old 03-08-2018, 10:20 AM   #8
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I have an ISB275 98.5 24Valve version. I had power problems many years ago. it was intermittent at first and then later it got worse so that it took forever to get up to speed.

I replace my Speed or Crankshaft sensor. It is not shown in the above diagram. Also I am pretty sure I don't have a camshaft sensor.

The crankshaft or speed sensor is the easiest sensor to get to and is located close to the oil pan in approx. center on the passenger side of a DP.

Once I replace it no more acceleration problems.
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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