Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
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 07-31-2015, 08:57 AM   #1
Junior Member
 
Join Date: Jul 2015
Location: Williams Lake BC Canada
Posts: 9
Engine running very rich

I have a 1993 F53 Ford motorhome chassis with a 460 ci engine. My in tank fuel filter was getting weak (around 20 psi under load) so I installed a new pump. Now my engine is running very rich so much that it spits out in burnt fuel on the driveway. The performance is a load better but the gas mileage is BAD. Any suggestions? Plugs,wires,rotor and cap have all changed recently. Fuel filter on the rail has also been replaced.
__________________

__________________
Rsharker 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 07-31-2015, 09:09 AM   #2
Senior Member
 
89sandman's Avatar
 
Join Date: May 2012
Posts: 879
Are you sure what is getting on your driveway is unburnt fuel and not condensation? I would have your obd1 scanned and see what it shows.
__________________

__________________
89sandman is offline   Reply With Quote
Old 07-31-2015, 09:17 AM   #3
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,060
That's a carbureter engine, right? A rich mixture is a carburetor problem, though I suppose the fuel pump could be overpowering it and forcing more fuel through than the carb is designed to handle.

Even if its a TBI (throttle body injection), it's still a fuel mixture issue.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 07-31-2015, 02:14 PM   #4
Senior Member
 
falconman's Avatar


 
Join Date: Apr 2008
Location: On the Road
Posts: 769
Where did you get the 20 psi reading at? If it's a carb engine that sounds way to high. If it's EFI then it's to low which might have caused you the problems. What's the pressure reading now, after the new pump? If it's EFI then maybe the fuel pressure regulator is bad. Need a bit more info on what you're working with.
__________________
Dan & Arlene
2005 Monaco Dynasty Diamond IV
Chasing the good weather
falconman is offline   Reply With Quote
Old 07-31-2015, 03:10 PM   #5
Senior Member
 
38Chevy454's Avatar
 
Join Date: Aug 2013
Location: Cincinnati, OH
Posts: 742
Think you should have a fuel injected engine being a 93? If so and it is too rich, then you should be able to take to a real mechanic place that can scan the computer for active readings while it is running. Not a simple code reader, like Autozone or similar. A real scanning computer can tell if you have a fuel pressure problem, an O2 sensor problem, a MAF problem or many other potential sources.

Running too rich for a long time can overheat your catalytic converter and cause it to fail. You should not have any unburnt fuel out the exhaust, that is likely condensation. Too rich would tend to be black exhaust smoke, but not liquid.
__________________
2005 Kenworth Showhauler truck conversion.
. 44 ft, Cummins ISX15 450 hp, 10 speed, twin screw
I used to have a handle on life, but it broke
38Chevy454 is offline   Reply With Quote
Old 08-02-2015, 12:03 AM   #6
Junior Member
 
Join Date: Jul 2015
Location: Williams Lake BC Canada
Posts: 9
Sorry I forgot to mention that I have the TBI set up. The garage where I took my mh to we're the one's to give me the gas line PSI. The replacement Ford part stated the unit went up to 40 PSI while under load. The power has improved but at idle when I step on the gas pedal, black smoke billows out and while idlling there is a little bit of black smoke coming out. Another thing that I repaired was the metal pipe from the exhaust manifold to what I think is the EGR valve.I will be hooking up a scanner to the obd1. I'll post the results Tuesday afternoon.
__________________
Rsharker is offline   Reply With Quote
Old 08-02-2015, 10:24 AM   #7
Senior Member
 
jeepfreak's Avatar
 
Join Date: Mar 2003
Location: Home is where we park it
Posts: 417
On my last coach I had the F53 w/460 and while changing the chassis a/c compressor I some how knocked the vacuum line of the MAP sensor and the black smoke that came out the exhaust made it look like a bad running diesel. It looks like a small black box around the size of a pack of cigs with one vacuum line to it. Mine was located under the dog house on the drivers side.
__________________
2007 Allegro 34wa .WH w20 8.1 6speed. Bow tie powered 79 CJ7 or a 2014 Jeep Unlimited Rubicon Toad.
jeepfreak is offline   Reply With Quote
Old 08-02-2015, 11:03 AM   #8
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,060
OK, TBI. Neither fish nor fowl! I think Ford calls it CFI (Central fuel Injection), but it's the same thing. In any case, if there is excess pressure the fuel should return to the tank via a scavenging line. I think it is more likely that one of the engine sensors has failed or disconnected and the engine computer is not getting the right input on air mass or combustion (O2 sensor). It may even be running in "open loop" mode, meaning it is ignoring sensors and just using a fixed air/fuel mixture.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 08-02-2015, 05:04 PM   #9
Senior Member
 
GBRG07's Avatar
 
Join Date: Jun 2015
Location: Cloverdale BC
Posts: 137
There was a recall for fuel pressure regulator on fuel rail. They would leak through into the vacuum hose on the nipple and suck that gas into intake.
Can't remember exact years but mid 90's for sure.
Just pull the vacuum hose off and see if there is fuel there.
__________________

__________________
99 Dutch Star Spartan 300 Cummins,Toad 06 Matrix
31 Model A , 2007 Road Glide,
DW Suzie and Georgia Newfie,Cleo Mastiff
GBRG07 is offline   Reply With Quote
Reply

Tags
engine



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
8.1 liter engine running rough--sometimes missing ralphl Workhorse and Chevrolet Chassis Motorhome Forum 13 06-30-2015 03:22 AM
Triton V10 Ford Engine Issues dc1105 Ford Motorhome Chassis Forum 20 03-26-2015 09:07 PM
Jamestown Engine Plant Celebrates Anniversary with Cummins DriVer RV Industry Press 0 08-09-2014 09:26 PM
The Doggone Yellow Check Engine Light (C.E.L.) troth Winnebago Industries Owner's Forum 1 05-06-2014 10:05 AM
Engine Chugging djdobbins1 Cummins Engines 19 12-19-2013 03:39 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:22 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.