Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Caterpillar Engine Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-03-2021, 12:36 PM   #1
Senior Member
 
Join Date: Oct 2018
Location: Washington
Posts: 195
330 Cat misbehaving

After 7,000 flawless miles on this 'new to me' discovery, I went to start it up this morning and it cranked for a really long time before it started, now it idles like normal for a while, then stumbles from 750 RPM down to 600-500rpm. Once or twice it stalled.
I checked the water separator, no water in there. No check engine light.

Planning on leaving for a short trip this afternoon, now I'm concerned.
Thoughts?
JohnLoves2Sk is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-03-2021, 12:41 PM   #2
Senior Member
 
Join Date: Oct 2014
Posts: 3,916
First "suspect" with any diesel start/performance issue is to change the fuel filters. Even if no water, they could be clogged.


Certainly, it could be something else, but do the inexpensive first step first.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is online now   Reply With Quote
Old 09-03-2021, 02:31 PM   #3
Senior Member
 
RV735's Avatar
 
Winnebago Owners Club
Join Date: Nov 2010
Location: New York
Posts: 469
Blog Entries: 1
Sounds like the it could be a HUIE pump failing. I had similar symptoms when we were in Homer AK. I hope it is something simple.

A diesel mechanic can check the pressure out put to determine if all is OK. I know there are some article in this forum that talk about installation of a filter to help prevent future failure consequences down stream of the HUEI pump after replacement. If it is the HUIE pump I would strongly suggest installing the filter as a preventive measure.

This is the article I ref. "New Measures to Protect Your HEUI Pump"

Safe travels and THE JOY IS IN THE RIDE
__________________
2004 Meridian, 2019 Jeep Cherokee Trailhawk, Blue Ox, Airforce one
https://rvgr8escape.blogspot.com/
FMCA 403779
RV735 is offline   Reply With Quote
Old 09-03-2021, 06:28 PM   #4
Senior Member
 
astrnmrtom's Avatar
 
Join Date: Sep 2013
Location: Pacific Northwest
Posts: 1,152
Before going after the heui pump, there's a IAP Sensor that can get plugged with sludge which ends up with the system sending incorrect pressure to the injectors. This can make a hard/no start or run rough condition. An easy way to determine if it's the senor is to unplug it and try to start the engine. If it starts and runs, it's the sensor. From what I understand, you can remove the sensor, flush it out and re-install. Before any testing is done on the heui pump, check the sensor first.
__________________
Tom M. 1998 Safari Serengeti 3706,
300HP Cat 3126 Allison 3060, 600 watts of Solar.
Fisher and Paykel Residential refrigerator
astrnmrtom is offline   Reply With Quote
Old 09-04-2021, 11:12 AM   #5
Senior Member
 
Join Date: Oct 2018
Location: Washington
Posts: 195
UPDATE:. Changed the fuel filter/water separator, tank out a bit, issue still exists. Going to go find an ISP sensor next.

Thanks you everyone for your feedback!
__________________
2003 Fleetwood Discovery 39L
JohnLoves2Sk is offline   Reply With Quote
Old 09-04-2021, 11:22 AM   #6
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,892
I'm late to the party on your issue .
Some info you might find useful.
The C-7 and 3126B & E engines are similar to the point the pdf info is useful for both.

When replacing the sensor , do not over torque or you'll damage the seal ( O ring ).
Attached Thumbnails
Click image for larger version

Name:	Sensor torque.JPG
Views:	36
Size:	185.1 KB
ID:	341952  
Attached Files
File Type: pdf 3126B no start.pdf (130.3 KB, 14 views)
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is online now   Reply With Quote
Old 09-16-2021, 09:25 PM   #7
Senior Member
 
ftodaro's Avatar
 
Join Date: Feb 2015
Posts: 580
I hope the OP comes back and posts an update or the fix. It helps all of us with more data.
__________________
Frank, Columbus, Ohio
2001 Itasca Horizon Cat 3126B 330hp, 2018 Jeep GC Limited, EPS harness or 24' Enclosed Car Hauler
ftodaro is offline   Reply With Quote
Old 09-16-2021, 10:06 PM   #8
Senior Member
 
Join Date: Oct 2018
Location: Washington
Posts: 195
Solved!

Thank you everyone!
The IAP sensor was the issue. $160 at Freightliner Northwest in Pacific WA.

If you have this issue, note that the new sensor has 6 sides, 15/16",
But the stock one is round, so I didn't have the right tool with me to take it out. Vice grips had to take it out. Fortunately it's not torqued in hard, it's machine threads with an O-ring seal. (Freightliner NW gave me an O-ring automatically, it's a separate part)

Poor access makes it tough to get a wrench to it, but it's do-able to sneak the wrench in through the wires and tubing.

Be careful to clean the area around the sensor thoroughly so paint chips and dirt don't get into the hole while the sensor is out.

Thanks again!
__________________
2003 Fleetwood Discovery 39L
JohnLoves2Sk is offline   Reply With Quote
Old 09-16-2021, 10:55 PM   #9
Senior Member
 
Dick1142's Avatar
 
Monaco Owners Club
Join Date: Dec 2009
Location: Underwood WA
Posts: 427
A picture of the sensor and access sure would be nice.
__________________
Bev & Dick and Fuzzy the cat
2005 Safari Cheetah 38
2009 Honda CRV dinghy
Dick1142 is offline   Reply With Quote
Old 09-16-2021, 11:02 PM   #10
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,892
Here's one from the top . Yellow circle .
and a diagram side view.
Attached Thumbnails
Click image for larger version

Name:	IAP%20Location (640x530).jpg
Views:	33
Size:	190.5 KB
ID:	343322  
Attached Images
 
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is online now   Reply With Quote
Old 09-17-2021, 07:39 PM   #11
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,892
Quote:
Originally Posted by Skip426 View Post
Here's one from the top . Yellow circle .
and a diagram side view.
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 .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is online now   Reply With Quote
Old 09-17-2021, 07:53 PM   #12
Senior Member
 
ftodaro's Avatar
 
Join Date: Feb 2015
Posts: 580
Quote:
Originally Posted by Dick1142 View Post
A picture of the sensor and access sure would be nice.
If you have not done this yet you should open up an account with Cat on line parts. You can put in your vin number look up your parts. It provided part diagram blow ups and you can price all the parts you need. the price on line is the same as you pay going to the parts counter. I often order them on line and go in and pick them up. Also once your in the system they email you sales info. like when they have a sale for filters 20 or 25% off. If your a DIY guy like me this is the way to go.

https://parts.cat.com/en/catcorp
__________________
Frank, Columbus, Ohio
2001 Itasca Horizon Cat 3126B 330hp, 2018 Jeep GC Limited, EPS harness or 24' Enclosed Car Hauler
ftodaro is offline   Reply With Quote
Old 09-17-2021, 08:13 PM   #13
Senior Member
 
Dick1142's Avatar
 
Monaco Owners Club
Join Date: Dec 2009
Location: Underwood WA
Posts: 427
Thanks Skip426 and ftodaro. Great response and help. Dick
__________________
Bev & Dick and Fuzzy the cat
2005 Safari Cheetah 38
2009 Honda CRV dinghy
Dick1142 is offline   Reply With Quote
Old 09-17-2021, 08:14 PM   #14
Senior Member
 
astrnmrtom's Avatar
 
Join Date: Sep 2013
Location: Pacific Northwest
Posts: 1,152
I've read that some people carry a spare sensor. There have been cases of mechanics changing out the Heui pump for thousands of $$$ only to discover the old pump was fine and the problem was the $150 sensor. Unplugging the sensor to test it should be the first step before assuming it's the pump. It's a test even the coach owner can do if they have similar symptoms. Cost=$0

I've also read of people removing the sensor and cleaning it out with brake cleaner as a on-the-side-of-the-road fix.

Glad that's all it was. Phew!
__________________
Tom M. 1998 Safari Serengeti 3706,
300HP Cat 3126 Allison 3060, 600 watts of Solar.
Fisher and Paykel Residential refrigerator
astrnmrtom is offline   Reply With Quote
Reply

Tags
cat



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
converter misbehaving??? kernst52 RV Systems & Appliances 15 04-16-2018 07:53 PM
New Suburban SW6DE Water Heater Misbehaving Bookkeeper RV Systems & Appliances 1 03-29-2018 04:23 PM
Bounder: Furnace Misbehaving...Any Ideas? Oscar Mike Fleetwood Owner's Forum 23 01-03-2013 05:45 PM
Hefty Fees in Store for Misbehaving Virginia Drivers Jayco1 Just Conversation 9 08-02-2007 04:34 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 10:02 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.