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.
  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 09-01-2017, 04:02 PM   #1
Junior Member
esslinger5's Avatar
Join Date: Aug 2015
Posts: 25
1990 p30 454 with carb running rich

Anybody know where to locate the fuel adjustment on the carb?

esslinger5 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 09-01-2017, 04:06 PM   #2
Chevelle427's Avatar
Join Date: Aug 2017
Posts: 85
What type carb
If holly
Jets are in metering block
But just starting to run rich could be flooding prob
If so there is an adjuster on top for the flote on top of bowel (2)
holly bad about any trash can make needle not seal all way
Could be a dead cylinder maybe a bad plug or wire

Iv not had a holly just start to run rich without help

Chevelle427 is offline   Reply With Quote
Old 09-01-2017, 04:37 PM   #3
Junior Member
esslinger5's Avatar
Join Date: Aug 2015
Posts: 25
There has been lots of tinkering with the motor so I'm sure that helped. But plugs and wires are all new and all cylinders have compression
esslinger5 is offline   Reply With Quote
Old 09-01-2017, 04:53 PM   #4
Chevelle427's Avatar
Join Date: Aug 2017
Posts: 85
Fyi re check wires BBC will run on 7 cyl
Firing ordere
To find
Num 1 cyl
rotor button points towards frt motor driver side that is number 1 cyl
Then just ck firing order
If motor has had work and someone trying to hop it up and this was an ongoing issue carb could be too big (cfm) or jets to large
Jets are not hard to change just have to test and tune
Chevelle427 is offline   Reply With Quote
Old 09-01-2017, 04:56 PM   #5
Senior Member
Charlie 5320's Avatar
Join Date: Mar 2017
Posts: 602
Originally Posted by esslinger5 View Post
There has been lots of tinkering with the motor so I'm sure that helped. But plugs and wires are all new and all cylinders have compression
Won't have a Holley on it unless somebody put it on there. They had Quadrajets on them from the factory. Bout the only adjustment on a Quadrajet is for the choke pull off. If it's a Quadrajet and running rich, most likely the needle and seat in the carb or the well plugs are leaking bad. Either way, a rebuild may be in order. Trying to find a guy that knows Quadrajets in this day and age may be pretty tuff to do. Is it hard to start after it sits for a few days or only after a few minutes. If both, that is a sign of leaking well plugs.
2003 Dolphin 5320
Charlie 5320 is offline   Reply With Quote
Old 09-02-2017, 07:10 AM   #6
Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 1,907
IF you have a Quadrajet carb. you could also have a bad float. Most of these carbs used composite floats which have a coating on them to seal the porous composite material. After time the sealer has a tendency to crack and gas will penetrate the float and add weight to it. This will hold the float down into the bowl and allow fuel to seep past the needle causing the carb to run rich.
Composite floats are not repairable but are generally priced under $15.
Some of these carbs had brass floats. I have seen these develop a crack in the solder joint where the top and bottom halves of the float are put together. They can be repaired but it is tricky. Replacements should be readily available. About the same price as composite.
There should be a number stamped on the side of the carb. vertically which will start out with 170******. This number is the best reference to use when buying parts for these carbs. The number will be on the driver's side rear of the float bowl.
I have a set of float level gauges which can be used by inserting one into the air horn while the engine is idling. By reading the level I can tell if the float level is correct without removing the carb. top. If the level is too low I know the float is fuel soaked and needs replacement.
If someone has tried to do some mods for performance on a Q-jet they may have tampered with the primary metering rack adjustment. In the center of the front of the carb base you will see a plug staked into place if the adjustment hasn't been tampered with. There are NO specs anywhere for this adjustment. It was set at the factory with a flow bench and should never be touched. If it has been I would junk the carb. You will never get the carb to work correctly.
I started working on Q-jet carbs in the fall of 1965 when they appeared on the 1966 Olds Toronado and other 4 bbl. Olds engines among other GM lines. Corvette started using Q-jets in 1965 if I remember correctly. I was working in an Olds / Cadillac dealership back then and attended several factory schools including the Rochester school which was in the same building as the GM training center which served our district.
If I had the carb part number I'd be happy to help you find parts if you need help.

2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote

454, p30

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
1995 P30 454 TBI running ruff John1 Workhorse and Chevrolet Chassis Motorhome Forum 2 03-06-2016 06:46 PM
1990 bounder P30 with Chevy 454 Starting Problems chilibeerman Vintage RV's 41 05-21-2012 11:41 AM
cruise control not working 1990 Fleetwood P30 chevy 454 chassi tspivey0534 MH-General Discussions & Problems 3 05-09-2010 04:09 PM
Fuel PSI range to carb on GM 454 Gary - K7GLD Vintage RV's 13 04-04-2010 10:31 PM
Chevy 454 Running rich ddwillis Vintage RV's 5 11-09-2008 12:02 PM

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:05 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.