timing jumping
Thread Starter
|
New User
Joined: Dec 2002
Posts: 5
Likes: 0
From: fredonia usa
timing jumping
I have an 85 150 which when the throttle positioner is hooked up, the timing will asjust itself until the point where the engine will barely run. I unplug the throttle positioner and the engine will run fine. Replaced it and no improvement. Any help would be appreciated.
Thread Starter
|
New User
Joined: Dec 2002
Posts: 5
Likes: 0
From: fredonia usa
timing jumping
Engine has a feedback carb and there have not been any modifications that I am aware of. It was running fine then gradually started running worse til it would barely run. Checked the timing and it was off. Reset the timing and within a couple of days the same thing would occur. I did that a couple of times with the same results. That's when I unplugged the throttle positioner. The timing stays but I don't think there is any advance. I have not pulled the codes. One problem that I have had was the pin through the distributer has broken a couple of times in the winter. I think I was running too heavy of an oil.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
timing jumping
Sounds more like a bent distributor or bad bearings in it. That would account for the pin breaking AND the timing drifting. Oil could never do it just from too-high viscosity, but the lack of lubrication might have.
Thread Starter
|
New User
Joined: Dec 2002
Posts: 5
Likes: 0
From: fredonia usa
timing jumping
The timing will stay where set as long as the throttle positioner in disconnected. That's why I think it's an electical/sensor problem as compared to a mechanical problem. Last winter is when I had the problem with the pin breaking. I was still running 20/50 and when the temp dropped below 0 that's when it broke. I do have a spare distributor that I will put in and try. In regards to the weight of the oil, I have since gone to 10/40 with no trouble and after reading what others on this site have said I plan to go to 10/30. I always thought the heavier the oil the better the lubrication. I guess not.
I also replaced the ignition module last winter. I can't quite remember when my timing problem occurred but it was after the module replacement. Purchased from autozone who I try to limit what I buy from them. Most is junk but its hard to tell with electronics. Thank you
I also replaced the ignition module last winter. I can't quite remember when my timing problem occurred but it was after the module replacement. Purchased from autozone who I try to limit what I buy from them. Most is junk but its hard to tell with electronics. Thank you
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
timing jumping
But you said you kept having to reset the timing. 
Was the distributor rotating slowly by itself and you had to keep putting it back to the stock position, OR have you progressively moved it further & further away from stock to keep the engine running right? IOW, if you had put a mark on the distributor near the clamp bolt before this problem, would the distributor be on that mark after each adjustment, or would you have spun it further away each time you "fixed" it?
Was the distributor rotating slowly by itself and you had to keep putting it back to the stock position, OR have you progressively moved it further & further away from stock to keep the engine running right? IOW, if you had put a mark on the distributor near the clamp bolt before this problem, would the distributor be on that mark after each adjustment, or would you have spun it further away each time you "fixed" it?Trending Topics
Thread Starter
|
New User
Joined: Dec 2002
Posts: 5
Likes: 0
From: fredonia usa
timing jumping
I had to reset the timing when I had the throttle positioner connected. I think that the distributor would be in a different position when the timing was put back to 10 degrees btc. I will have to connect the throttle positioner again and make sure that this is accurate. Knowing my luck, it'll run fine and I won't have a clue as to why.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
dodgewade
1987 - 1996 F150 & Larger F-Series Trucks
12
Apr 9, 2016 04:49 PM
540milotalon
1994.5 - 1997 7.3L Power Stroke Diesel
3
Oct 1, 2015 05:47 PM
steve(ill)
Explorer, Sport Trac, Mountaineer & Aviator
8
Aug 4, 2015 05:24 PM
delano79
1987 - 1996 F150 & Larger F-Series Trucks
10
Aug 30, 2011 08:36 PM