RV.Net Open Roads Forum: 93 Brave with Chevy 454 acceleration issuea

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Class A Motorhomes

Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > 93 Brave with Chevy 454 acceleration issuea

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 5  
Next
Sponsored By:
psalm10720

Clearwater, FL

Full Member

Joined: 04/16/2014

View Profile



Good Sam RV Club Member

Offline
Posted: 03/06/18 03:50pm Link  |  Print  |  Notify Moderator

Have a 93 Brave 27RC on a Chevy P30 chasis. 112000 miles. When cold idles well and accelerates well from standing still. Then after warmup when accelerating from a start it falters often. Some refer to it as “falling on its face” or “backfiring” without the loud noise. One of the possible explanations refers to the “accelerator pump” on the carburetor. Another which sounds more plausible is the ECM has a problem because the programming during warmup is different than after the engine is warmed up... Anybody with experience?

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile


Offline
Posted: 03/06/18 04:24pm Link  |  Print  |  Notify Moderator

No carburetor, it's fuel injected.
I would replace the 02 sensor first. It/they should have been replaced by now and if not, are in desperate need. (They get lazy and slow but work well enough not to throw a code) When eng is cold it isn't a factor.
Also make sure every other service has been done to it.


Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2018 Silver Fox 32A - many mods to come!
H0NDA eu2000i

enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 03/06/18 04:57pm Link  |  Print  |  Notify Moderator

It could be the IAC(idle air control) It is mounted on the right side of the throttle body assembly. It acts similar to a choke on a carb engine. The passages could be clogged with carbon.
IAC


Bud
USAF Retired
Pace Arrow

2003 Chev Ice Road Tracker


psalm10720

Clearwater, FL

Full Member

Joined: 04/16/2014

View Profile



Good Sam RV Club Member

Offline
Posted: 03/06/18 05:05pm Link  |  Print  |  Notify Moderator

Mine is carbureted

Lwiddis

Los Angeles :(

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 03/06/18 05:09pm Link  |  Print  |  Notify Moderator

Find an OLD mechanic for the repair of this 25 year old RV.


2015 Winnebago 2101DS TT & Tahoe LTZ, 300 watts WindyNation solar-parallel & MPPT, Trojan T-125s. TALL flagpole for US flag. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - old MOS 1542 & 1560.


enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 03/06/18 06:42pm Link  |  Print  |  Notify Moderator

93 are throttle body injection. The throttle body looks like a two barrel carb.
Verify your vin number, the tenth character would be a "P" for 1993, 1992 would be the letter "N"
Remove air filter and look into the throat, there should be two injectors at the top. They are about 1 inch diameter and two inches long, each have an electrical connector.
If someone changed out motor that could have carb.
Then all bets are off until you find engine vin number.

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile


Offline
Posted: 03/06/18 06:45pm Link  |  Print  |  Notify Moderator

Pretty sure it's TBI. Carbs just couldn't do emissions by then.
They look like carbs since everything is in one spot.

Strongly suggest replacing the 02 sensor which is dirt cheap and easy to replace yourself.
Also make sure there's no exhaust leaks at the manifold which will mess with sensors.

enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 03/06/18 06:57pm Link  |  Print  |  Notify Moderator

My cheap books says all the way back to 1987 7.4 engine had TBI.

keymastr

S.E. Washington

Senior Member

Joined: 07/11/2014

View Profile


Offline
Posted: 03/06/18 07:03pm Link  |  Print  |  Notify Moderator

Mass air flow sensor could cause this also.

Stim

NE Florida

Senior Member

Joined: 05/23/2007

View Profile


Offline
Posted: 03/06/18 07:52pm Link  |  Print  |  Notify Moderator

TBI has a fuel pressure regulator in it and they get weak over time.
They are not hard to change or expensive.
I had to change the one on a 1989 PU back when.
Can be changed on the vehicle if you have good access.

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 5  
Next

Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > 93 Brave with Chevy 454 acceleration issuea
Search:   Advanced Search

Search only in Class A Motorhomes


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2018 CWI, Inc. © 2018 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS