Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 08-04-2021, 03:39 PM   #1
Senior Member
 
Newmar Owners Club
Workhorse Chassis Owner
Join Date: Apr 2018
Posts: 180
Short Term and Long Term Fuel Trim readings

My LTFT going up hills was 11 at the same time my STFT was -3 or 4 is that something to worry about?
thanks
Floyd
__________________
2003 Newman Kountry star 33.4'
Workhorse W-22 Gasser
Tawas, Michigan
Floyd2u 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 08-04-2021, 04:35 PM   #2
Senior Member
 
Join Date: Aug 2019
Location: Eastern outskirts of Dallas, TX
Posts: 4,471
I’ve found Jon @ Brazel’s, a sponsor on this site, to be very helpful when trying to troubleshoot LTFT and STFT numbers.

From what I remember of everything I read and he and I discussed, I’m thinking your OK as the numbers are additive - and anything below 10 is good.

But for grins, let me make some suggestions -

If you have a K&N filter, be very careful in how you lubricate it - ANY excess oil that slips past the filter will contaminate the MAF and pretty much ruin it.

Clean your MAF with MAF cleaner or rubbing alcohol ONLY.

I had previously replaced my plugs (41-101’s) and plug wires (Magnums) from Brazel’s before I started conversation with Jon. Against others advice, I did not regap the plugs from .060 to .045.

My coach is an ‘02. The 8.1l used a fuel rail mounted regulator/dampener through I think ‘04. One test for the regulator/dampener is to pull the vacuum line and check for raw fuel. It should be dry (mine squirted gas at me - so replaced).

Borrow a fuel pressure test kit from a local auto store and follow the fuel procedure test procedure for the engine. I don’t recall the numbers exactly, but I believe it’s supposed to be 55 - 68 pounds with the engine running, and drop to no more than 48#’s after 3 minutes.
Fortunately the PO of our coach had recently had the fuel tank and pump replaced - only thing I don’t know is what quality of pump was installed.

In the end on our coach - I replaced the MAF after having sent “live data” numbers to Jon for assessment.

Best deal I could find on a new Delphi MAF or regulator/dampener was from Amazon, and as noted above, plugs and wires from Brazel’s.

Due to recent family issues, we’ve not been able to get the coach out on the road since doing all of the above - but with each “fix”, I noted increased pep in this old girl with 37k miles on her.
MrMark52 is online now   Reply With Quote
Reply



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
Confused about MAF and LTFT readings Greedo Workhorse and Chevrolet Chassis Motorhome Forum 14 12-10-2020 06:00 PM
LTFT too high jlmanatee Workhorse and Chevrolet Chassis Motorhome Forum 9 09-17-2020 02:47 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 09:55 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.