Bronco Fix    
Bronco Fix    
 


Home   Gallery   Tech   Glove Box   For Sale
Uncommanded acceleration

 
Post new topic   Reply to topic    Bronco Fix Forum Index :: Steering, Brakes, Wheels and Tires
View previous topic :: View next topic  
Author Message
Puff Daddy
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 17 Dec 2005
Posts: 509
Location: Tri Cities, WA

PostPosted: Wed Jan 28, 2015 1:12 pm    Post subject: Uncommanded acceleration Reply with quote

Recently, as I brake and come to a stop, I get an uncommanded acceleration that only stops if I take my foot off the brake pedal. Has anybody experienced this, or know what may be the cause?
_________________
Tom

Uncut '73, stock 302 w/Headers, Holley TA Carb, Centech Harness, Wildhorses 3.5 inch lift.
Back to top
View user's profile Send private message Send e-mail
oldwinghunter
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 17 Mar 2007
Posts: 1131

PostPosted: Wed Jan 28, 2015 2:13 pm    Post subject: Reply with quote

I would say that your power brake booster has a vacumme leak ....
_________________
most people are absent,,, my merciful nature, and sense of fair play !
Back to top
View user's profile Send private message Send e-mail
Puff Daddy
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 17 Dec 2005
Posts: 509
Location: Tri Cities, WA

PostPosted: Thu Jan 29, 2015 5:45 am    Post subject: Reply with quote

oldwinghunter wrote:
I would say that your power brake booster has a vacumme leak ....


I have stock drum non-powered brakes.

_________________
Tom

Uncut '73, stock 302 w/Headers, Holley TA Carb, Centech Harness, Wildhorses 3.5 inch lift.
Back to top
View user's profile Send private message Send e-mail
Stan
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 29 Jun 2004
Posts: 3606
Location: Boring Or

PostPosted: Thu Jan 29, 2015 8:21 am    Post subject: Reply with quote

My best - non smartass answer - could it have something to do with the hand throttle cable ? The cable runs down to the top of the gas pedal - and is kind of close to the brake pedal fulcrum.
Stan

_________________
When you come to a fork in the road - take it
Homer - " Facts are meaningless . You could use facts to prove anything that's even remotely true."
Back to top
View user's profile Send private message
Puff Daddy
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 17 Dec 2005
Posts: 509
Location: Tri Cities, WA

PostPosted: Thu Jan 29, 2015 9:10 am    Post subject: Reply with quote

Stan wrote:
My best - non smartass answer - could it have something to do with the hand throttle cable ? The cable runs down to the top of the gas pedal - and is kind of close to the brake pedal fulcrum.
Stan


Again, I wish it were that easy. I don't have one of those.

It seems like it occurs right as my front suspention "unloads" after I come to a complete stop.

This sounds out of left field, but...it it possible that my engine could be loose on the mounts, and is somehow affecting the throttle linkage?

It just seems like the linkage between the throttle and the carburator is so simple. I don't see how it could be that. In my simplistic mind, the only other thing that could be moving is what the carb is attached to.

Coincidentally, I have a pretty significant rattle where the fan hits the shroud if I accellerate too hard. (It started sometime after I completed my power steering upgrade, and I can't seem to get the shroud adjusted right.) Maybe the problem's not really with the shroud.

_________________
Tom

Uncut '73, stock 302 w/Headers, Holley TA Carb, Centech Harness, Wildhorses 3.5 inch lift.
Back to top
View user's profile Send private message Send e-mail
Stan
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 29 Jun 2004
Posts: 3606
Location: Boring Or

PostPosted: Thu Jan 29, 2015 10:25 am    Post subject: Reply with quote

You might be " on to something" - now that you mention it -- busted motor mount.
Stan

_________________
When you come to a fork in the road - take it
Homer - " Facts are meaningless . You could use facts to prove anything that's even remotely true."
Back to top
View user's profile Send private message
oldwinghunter
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 17 Mar 2007
Posts: 1131

PostPosted: Thu Jan 29, 2015 2:40 pm    Post subject: Reply with quote

motor mount could also be an issue then.. whole motor movin around ...
_________________
most people are absent,,, my merciful nature, and sense of fair play !
Back to top
View user's profile Send private message Send e-mail
DirtDonk
BFix Locked and Loaded
BFix Locked and Loaded


Joined: 27 Jul 2003
Posts: 2749
Location: San Jose, CA

PostPosted: Mon Feb 02, 2015 3:56 pm    Post subject: Reply with quote

Absolutely. In drive it will twist one way, while in reverse it will twist the other.
While it's probably just expedient to replace the mounts if they're old enough, you could probably ratchet strap the engine down (both sides) and drive it that way temporarily to see how it reacts.

Temporary unless it works that is!

Paul

_________________
'71 Bronco - 302 4v
3.5" WH/Skyjacker Lift
33 x 11.50 x15 Thornbirds on 15x7 Enkei's
Kayline soft top
Hanson bumpers
Dual batteries, Large 1G alt.

WWW.WILDHORSES4X4.COM Mr. Green
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    Bronco Fix Forum Index :: Steering, Brakes, Wheels and Tires All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum

Brought to you by The Bronco Horde and Vintage Bronco