Go Back   Ford Truck Enthusiasts Forums > Misc. > Alternative Fuels, Hybrids & Mileage
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-02-2004, 07:49 PM
007bronco's Avatar
007bronco 007bronco is offline
Senior User
 
Join Date: Feb 2004
Location: British Columbia
Posts: 339
007bronco is starting off with a positive reputation.
Propane 351M idles too fast

Hi, my 351M Bronco has a few issues.

-runs beautiful 1500 rpm or more regardless of timing
-starts good cold but will not idle without help til warm
-takes a bit to start warm with gas pedal depressed.
-will not idle below 800 rpm, it lopes, misses etc.
-will not run with brake pedal applied, disconnected and capped brake vac line had to bump up idle huge to run, runs same.
-has lots of power and is running on all cylinders.
-I think I have a vac problem but I may have a problem with the propane system as well-power valve is backed out almost all the way, idle screw on back of carb doesn't seem to do anything (IMPCO 425)- regular throttle body idle screw is all I can use to affect idle.
-Engine was rebuilt 6000 km ago-no smoke-no leaks-good power.
-truck works great if idle is 1200 rpm+
-has aftermarket 4bbl intake and impco adapter
-throttle response is quick with no bogging or pinging.
any thoughts?
thanks
007BRONCO
__________________
05 F-350 Lariat PSD 4x4 CC SB. SCT XCAL II, MBRP 4", Bilstein 5100's, 4.5" Donahoe racing lift
Reply With Quote
  #2  
Old 12-03-2004, 01:05 AM
bigblocksix bigblocksix is offline
Senior User
 
Join Date: Nov 2003
Location: vancouver bc
Posts: 167
bigblocksix is starting off with a positive reputation.
i know nothing about propane but i would sugust taking it to a licenced propane mechanic and getting him to look it over, an hours labor to look over it could save ya a hole day of screwin arround
Reply With Quote
  #3  
Old 12-03-2004, 08:12 PM
007bronco's Avatar
007bronco 007bronco is offline
Senior User
 
Join Date: Feb 2004
Location: British Columbia
Posts: 339
007bronco is starting off with a positive reputation.
I hear ya, and I will consider it, I'll probably learn all there is to know after an hour with a good propane guru.
cheers
007BRONCO.
__________________
05 F-350 Lariat PSD 4x4 CC SB. SCT XCAL II, MBRP 4", Bilstein 5100's, 4.5" Donahoe racing lift
Reply With Quote
  #4  
Old 12-09-2004, 03:18 AM
furball69's Avatar
furball69 furball69 is offline
Postmaster
 
Join Date: Jul 2003
Location: Calgary, Canada
Posts: 2,628
furball69 has a very good reputation on FTE.furball69 has a very good reputation on FTE.furball69 has a very good reputation on FTE.
You can use an 18" length of 1/2" or 3/4" copper tubing to locate vacuum leaks. hold one end you your ear and point the other end toward the engine, sweeping it around until you hear the leak. Careful not to get too close to the fan, belts or pullies.

Was the valvetrain rebuilt? Missing at low rpm could be sticking valves and would definitely cause a vacuum problem.
Reply With Quote
Old 12-09-2004, 03:18 AM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
89 f350 351 idle question... highntight 1987 - 1996 F150 & Larger F-Series Trucks 4 10-17-2013 10:49 AM
stumbling when on propane gungho351 Alternative Fuels, Hybrids & Mileage 1 06-15-2007 02:48 PM
proper plug temp and gap eastvanmikee Alternative Fuels, Hybrids & Mileage 3 07-20-2005 01:22 AM
Impco 225 Adjustment 351M Alternative Fuels, Hybrids & Mileage 6 06-01-2005 03:02 AM
Propane System on a 4.9L F-250 abelmoreno 1987 - 1996 F150 & Larger F-Series Trucks 0 01-24-2005 10:31 AM


Go Back   Ford Truck Enthusiasts Forums > Misc. > Alternative Fuels, Hybrids & Mileage

Tags
351, 351m, bronco, fast, ford, modified, propane

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 08:46 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup