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Old 09-17-2021, 08:39 PM   #15
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Quote:
Originally Posted by Skip426 View Post
OK , I guess I should have been more specific , yellow circle is the IAP sensor , red circle would be the spot where a manual lift pump would have been mounted ; probably removed to allow lower clearance in the engine bay as it mounted at a 45 degree angle .
Okay, I cry uncle! Have a Cat account but can't find the sensor? Part number or more reference please?
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Old 09-17-2021, 09:21 PM   #16
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Quote:
Originally Posted by vseasport View Post
Okay, I cry uncle! Have a Cat account but can't find the sensor? Part number or more reference please?
Ok ' I'll have to step aside on this question ; I've never needed the part or had a Cat account .
In 11 years with my 3126B , I have collected a bunch of info , but never joined the Cat parts service .
Maybe it's time .
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Old 09-18-2021, 07:07 AM   #17
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Originally Posted by Skip426 View Post
Ok ' I'll have to step aside on this question ; I've never needed the part or had a Cat account .
In 11 years with my 3126B , I have collected a bunch of info , but never joined the Cat parts service .
Maybe it's time .
Does this look like the right part?
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Old 09-18-2021, 11:22 AM   #18
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Originally Posted by vseasport View Post
Does this look like the right part?
I can't enlarge the thumbnail without loosing all clarity .

Internet search turns up any number of IAP sensors , but a multitude of Cat part numbers .
I'd have to get hands on on my engine to see if the wiring connector is like the one in this picture .
Also as noted the O ring has to be purchased separately .
Photo is of the IAP from a different angle ; red oval ; yellow box is the HEUI pump.

EDIT: IAP sensor photo was rejected by the site ; invalid fie . I'll see if there's an acceptable photo out there.
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Old 09-18-2021, 05:04 PM   #19
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Quote:
Originally Posted by Skip426 View Post
I can't enlarge the thumbnail without loosing all clarity .

Internet search turns up any number of IAP sensors , but a multitude of Cat part numbers .
I'd have to get hands on on my engine to see if the wiring connector is like the one in this picture .
Also as noted the O ring has to be purchased separately .
Photo is of the IAP from a different angle ; red oval ; yellow box is the HEUI pump.

EDIT: IAP sensor photo was rejected by the site ; invalid fie . I'll see if there's an acceptable photo out there.
Here is the thumbnail enlarged. I already have a boatload of spare parts but it would be nice to put this info in my file. Don't want to buy a not needed injection pump one day.
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Old 09-18-2021, 05:16 PM   #20
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Thanks vseasport , for the enlarged thumbnail , Looks like the photos I'm seeing online .
Prices all over the place and different Cat P/Ns . Hard to sort through.
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Old 09-18-2021, 09:11 PM   #21
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IAPCV Injection Actuation Pressure Control Valve



122-5053: VALVE GP


This is what the valve looks like for my rig, the sensor is different from the valve. I am not sure what the difference is if the sensor fails or if the valve fails.
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Old 09-19-2021, 06:55 AM   #22
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Originally Posted by Skip426 View Post
Thanks vseasport , for the enlarged thumbnail , Looks like the photos I'm seeing online .
Prices all over the place and different Cat P/Ns . Hard to sort through.
Yes, I'm getting different part numbers also. Some of them have a notation that the part changed. This is from the Cat Parts site. At first I though maybe the part on my motor had been changed but what I think they are saying is their part has changed hence a different part numbers.
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Old 09-19-2021, 08:43 AM   #23
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Originally Posted by vseasport View Post
Yes, I'm getting different part numbers also. Some of them have a notation that the part changed. This is from the Cat Parts site. At first I though maybe the part on my motor had been changed but what I think they are saying is their part has changed hence a different part numbers.
I would be nice if companies had all the same practices when it comes to updated parts ; many keep the same part number , then add an alphabetical suffix to indicate a change ( improvement ) and you can see by the suffix the number of updates.

vseasport . ; Is your engine the 3126E or C-7 ? or a bigger Cat ?
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Old 09-20-2021, 07:02 AM   #24
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I would be nice if companies had all the same practices when it comes to updated parts ; many keep the same part number , then add an alphabetical suffix to indicate a change ( improvement ) and you can see by the suffix the number of updates.

vseasport . ; Is your engine the 3126E or C-7 ? or a bigger Cat ?
My motor is a 2003 3126E. It had 23,000 when we purchased it 2 1/2 years ago. Now it has 46,000. The motorhome is an 04 but on a Freightliner 03 chassis.

Earlier this year we were in Las Cruces NM and Steer-safe came out to the KOA and installed a stabilizer. They brought one for an 04 and had to go back to the shop for a different one. Apparently Freightliner made a modification between years.

Other than normal maintenance the only engine issue was having to change the alternator.

I am a little concerned about how the injection pump works. Somewhere I read that it functions on engine oil pressure and doesn't like dirty oil. That attracted me to this thread. I change the engine oil every 3,000 miles on the dot. Also my motor doesn't have a fuel filter on the motor like the one in the photo you posted. Somehow Tiffin got a hall pass from Cat to eliminate it because of a space problem. The only fuel filter is a S3210S water separating 2 micron Racor. I am very vigilant about that.

My attitude is take good care of your motor and it will take good care of you.

Long answer for a simple question.
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Old 09-20-2021, 09:23 AM   #25
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Yes , very important with Freightliner to have the chassis build date ( rather than the coach model year ) when dealing with parts and wiring info .

With the HEUI squeezing ( highly technical term ) the oil to 800 psi , clean oil is an absolute must.
Newmar /Freightliner , moved the secondary fuel filter off the engine in my coach too , fuel/water on suction side of the lift pump , secondary after the mechanical lift pump with high pressure hoses and fittings like a hydraulic system.
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Old 09-20-2021, 09:31 AM   #26
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Thank you everyone!
The IAP sensor was the issue. $160 at Freightliner Northwest in Pacific WA.
Thanks again!
John , I'd forgotten that vseasport , wasn't the original poster on this tread , glad your up and running properly , and sorry that we've hi-jacked your thread.
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