Poor Acceleration and Backfiring Resolved
Thread Starter
|
Junior User
Joined: May 2003
Posts: 56
Likes: 2
From: Katy, TX
Poor Acceleration and Backfiring Resolved
90 Bronco 5.0L w/ 4WD
I have had a long running problem w/ poor acceleration and backfiring once the engine fully warmed. No missing but engine would practically die under acceleration and usually lightly backfire through the throttle body. I discovered that retarding the timing a few degrees from 10 BTDC to about 6 BTDC helped a lot but did not fully cure. Engine idled fine and cruised at steady speed OK.
I checked every system that I felt could potentially cause this problem w/ no faults found.
No codes are set.
I finally decided to replace the distributor, since the issue appeared to be related to the timing w/ a warm engine. I purchased a used distributor from an 86, 302 mustang on ebay. It looked pretty rough when I got it, but I cleaned it up, new oring and installed.
It appears to be the cure. Engine will now accelerate reasonably w/ timing set at 10 BTDC, and no backfiring.
My speculation is the timing sensing device in the distributor was somehow sending a faulty signal that caused an improper timing response by the ECU.
I've seen similar problems posted on this forum, and hopefully this may be of help to others.
Regards
I have had a long running problem w/ poor acceleration and backfiring once the engine fully warmed. No missing but engine would practically die under acceleration and usually lightly backfire through the throttle body. I discovered that retarding the timing a few degrees from 10 BTDC to about 6 BTDC helped a lot but did not fully cure. Engine idled fine and cruised at steady speed OK.
I checked every system that I felt could potentially cause this problem w/ no faults found.
No codes are set.
I finally decided to replace the distributor, since the issue appeared to be related to the timing w/ a warm engine. I purchased a used distributor from an 86, 302 mustang on ebay. It looked pretty rough when I got it, but I cleaned it up, new oring and installed.
It appears to be the cure. Engine will now accelerate reasonably w/ timing set at 10 BTDC, and no backfiring.
My speculation is the timing sensing device in the distributor was somehow sending a faulty signal that caused an improper timing response by the ECU.
I've seen similar problems posted on this forum, and hopefully this may be of help to others.
Regards
Thread
Thread Starter
Forum
Replies
Last Post
jasindude1
1961 - 1966 F-100 & Larger F-Series Trucks
7
Nov 3, 2019 11:37 AM
wrooper
1987 - 1996 F150 & Larger F-Series Trucks
1
Sep 22, 2016 05:45 PM
JeepScrambler
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
Oct 24, 2014 10:18 AM
TonyGalasso
1967 - 1972 F-100 & Larger F-Series Trucks
6
Feb 18, 2013 02:48 PM
77F250CUSTEXP
1973 - 1979 F-100 & Larger F-Series Trucks
5
Jul 8, 2011 11:47 AM
