RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
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 05-19-2017, 11:07 AM   #1
Senior Member
 
Join Date: Feb 2017
Posts: 262
Ok a good one miss fire I think???

So 1990 460 I think my number three and number four cylinders are not firing reason I say I think it's because when I pull the plugs off the distributor cap while running it doesn't appear to change but when I rev the gas it feels like it's all good also when I put it in drive I get a lil shaking a doot doot doot doot doot doot type idle I do have a exhaust leak in one of the under pipes where. Previous owner hit something so I'm sure that's wher the noise is ..did a compression test on both of those cylinders and getting close to 150 psi from both cylinders..?? So lost as this is carburetor
Arricejr 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 05-19-2017, 12:19 PM   #2
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,926
Pulling the plug wires and getting no change of RPMs is a sign of bad plugs or wires. Since you know compression in the 2 cylinders, the plugs should have shown signs of not firing or a bad gap. If you didn't do the compression test, I'd pull the plugs and inspect them, if they aren't firing there should be a difference in the deposits that gives further clues. You could also loosen the wire at the plug, then with engine running see the size and strength of the spark when the wire is held near a ground, if it's weak or not present, then it's the wire, the distributer cap, or rotor.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is offline   Reply With Quote
Old 05-19-2017, 01:21 PM   #3
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by BFlinn181 View Post
Pulling the plug wires and getting no change of RPMs is a sign of bad plugs or wires. Since you know compression in the 2 cylinders, the plugs should have shown signs of not firing or a bad gap. If you didn't do the compression test, I'd pull the plugs and inspect them, if they aren't firing there should be a difference in the deposits that gives further clues. You could also loosen the wire at the plug, then with engine running see the size and strength of the spark when the wire is held near a ground, if it's weak or not present, then it's the wire, the distributer cap, or rotor.


New plugs and wires cap and rotor yesterday getting fire for sure ..was one of the reasons I tuned it up
Arricejr is offline   Reply With Quote
Old 05-19-2017, 02:00 PM   #4
Senior Member
 
Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Dec 2014
Location: Northeast Ohio
Posts: 376
Are you sure the plug wires are in the right order?

Could have been wrong before you replaced them, depending on which ones are crossed it can run pretty good considering.
__________________
2000 Fleetwood Southwind 32V - Ford F53 V10 6.8L 208"WB 20,500 GVWR
Randalpho is offline   Reply With Quote
Old 05-19-2017, 02:11 PM   #5
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by Randalpho View Post
Are you sure the plug wires are in the right order?

Could have been wrong before you replaced them, depending on which ones are crossed it can run pretty good considering.


You know I thought about that I switched them and looked up the routings everything seems fine and in order unless what I looked up was wrong
Arricejr is offline   Reply With Quote
Old 05-19-2017, 05:54 PM   #6
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 3,709
Cylinders #3 & #4 being next to each other I would look closely for a vacuum leak in the intake manifold runner somewhere. Possibly a fitting with a hose with a crack in it or even disconnected.
At higher RPM the skip would be less noticeable. ( But really is still there )
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Old 05-20-2017, 01:57 PM   #7
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by LETMGROW View Post
Cylinders #3 & #4 being next to each other I would look closely for a vacuum leak in the intake manifold runner somewhere. Possibly a fitting with a hose with a crack in it or even disconnected.
At higher RPM the skip would be less noticeable. ( But really is still there )
Lynn


That's exactly how it seems on the highway she rolls like nothing wrong.. well I'll have to wait as I just blew a tire last night on my way to Orlando and now I'm stuck in Orlando can't get tire till Monday..so no trouble shooting till Tuesday maybe wensday when I get back
Arricejr is offline   Reply With Quote
Old 05-20-2017, 01:59 PM   #8
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by LETMGROW View Post
Cylinders #3 & #4 being next to each other I would look closely for a vacuum leak in the intake manifold runner somewhere. Possibly a fitting with a hose with a crack in it or even disconnected.
At higher RPM the skip would be less noticeable. ( But really is still there )
Lynn


Also it was real bad at 1st I found a old dry rotten rubber plug that was on the carb and replaced it and what a difference but maybe as you said there's another I'm over looking
Arricejr is offline   Reply With Quote
Old 05-23-2017, 07:41 AM   #9
Senior Member
 
Join Date: Feb 2017
Posts: 262
Ok so made it to jax from Orlando and I'm really leaning on the face of it's something to do with carburetor or vacuum because the coach runs 60-65 with no hiccups I know if I was running with 2 cylinders missing I would definitely know it at those speeds so back to the drawing boards
Arricejr is offline   Reply With Quote
Old 05-23-2017, 12:14 PM   #10
Senior Member
 
Join Date: May 2017
Posts: 1,039
Here is a link to a chart that you can compare your information to:

LINK

I have to admit, being a Chevy/Chrysler guy really caused me some headaches with the first Ford I owned. Who would have thought that they needed to number their cylinders differently than the rest of the world?
DryCreek is offline   Reply With Quote
Old 05-24-2017, 11:29 AM   #11
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by DryCreek View Post
Here is a link to a chart that you can compare your information to:

LINK

I have to admit, being a Chevy/Chrysler guy really caused me some headaches with the first Ford I owned. Who would have thought that they needed to number their cylinders differently than the rest of the world?


lol thanks a million friend
Arricejr is offline   Reply With Quote
Old 05-30-2017, 05:19 AM   #12
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 3,709
Any updates?
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Old 05-30-2017, 12:43 PM   #13
Senior Member
 
Join Date: Feb 2017
Posts: 262
Quote:
Originally Posted by LETMGROW View Post
Any updates?
Lynn


No Lynn haven't been able to get on the rig as of yet did make it back from Orlando Hoping between tomorrow and wensday
Arricejr is offline   Reply With Quote
Old 11-21-2017, 05:48 AM   #14
Senior Member
 
Join Date: Feb 2017
Posts: 262
Well back on this chase I'm thinking it's fuel related because at times it runs smooth like during 1st crank up as it warms then it's running bad missing again when I drop it in drive it's really noticeable till I give it gas and get going have not as of yet found any intake leaks but I know for sure it's running rich as I can clearly smell it .. I guess I may have to get this thing smoked tested as I'm lost
Arricejr is offline   Reply With Quote
Reply

Tags
fire



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
Ford 460 CID has a miss fire every so often billsafetman Ford Motorhome Chassis Forum 23 01-02-2017 04:31 PM
Only one thing I will miss balinout Full-Timers 8 06-16-2012 07:25 PM
Think your RV is your "home"? Think again. GraciesMom iRV2.com General Discussion 59 05-10-2010 03:49 PM
I Think I Will Miss... MonacoMama Monaco Owner's Forum 17 05-09-2008 07:46 AM


All times are GMT -6. The time now is 03:58 AM.


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