Hot start problems. I need help
Thread Starter
|
Senior User
Joined: Mar 2007
Posts: 316
Likes: 0
Yes I did load test the battery. I then changed the battery out of one of my other rigs. Same thing all over again. I will go buy a timing light and and start with timing at 10 degrees and see if the problem persists.
New User
Joined: Sep 2010
Posts: 5
Likes: 0
Hiya Todd,
I've read thru your postings and if your satisfied with the condition of your starter, battery, and cables I would look a little deeper into the motor. Basically, I'd pull the spark plugs out with the motor cold and see how hard it is to turn it over, at least two complete turns, at the crankshaft pulley, maybe even measuring the torque required to turn it over with an old-type torque wrench-the torsion type with the pointer and gauge. Then warm it up and do the same, plugs removed and note the torque required to roll the motor two complete turns. The rolling resistance should be less with a warm motor than a cold motor. If it takes more torque or there is a tight spot while rotating the crank go one step further and pull the bolts that hold the converter to the flex plate to isolate possible tranny problems. If it's still hard to roll over you may need to look into the motor, or the trans if disconnecting it freed up the rotating mass.
Just a few ideas, hope it helps.
I've read thru your postings and if your satisfied with the condition of your starter, battery, and cables I would look a little deeper into the motor. Basically, I'd pull the spark plugs out with the motor cold and see how hard it is to turn it over, at least two complete turns, at the crankshaft pulley, maybe even measuring the torque required to turn it over with an old-type torque wrench-the torsion type with the pointer and gauge. Then warm it up and do the same, plugs removed and note the torque required to roll the motor two complete turns. The rolling resistance should be less with a warm motor than a cold motor. If it takes more torque or there is a tight spot while rotating the crank go one step further and pull the bolts that hold the converter to the flex plate to isolate possible tranny problems. If it's still hard to roll over you may need to look into the motor, or the trans if disconnecting it freed up the rotating mass.
Just a few ideas, hope it helps.
Thread Starter
|
Senior User
Joined: Mar 2007
Posts: 316
Likes: 0
Well I found the vac advance can was shot. I bought a new one, afraid I would lose the little "e" shaped clip that holds the arm to the advance plate, I decided to pull the dizzy. Put it all together and went to stab the dizzy back and the oil pump drive rod fell out into the pan while I was puttin back in. Didnt know it until I fired it up and had no oil pressure and loud noises! Bent the crap out of the drive shaft and broke the piston skirt off of #2 on the non thrust side. Discovered the oil pump pick up was nearly clogged with hard black plastic chunks of "????" Any clue what the plastic is from?
Now I gotta tear this motha down! I am thinking about transplanting entire drive train, axles, sheet metal, and long bed onto the 78 crew. Wifes been wantin one to go away for a long time.
Now I gotta tear this motha down! I am thinking about transplanting entire drive train, axles, sheet metal, and long bed onto the 78 crew. Wifes been wantin one to go away for a long time.
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 60
Josh
Posting Guru
Joined: Apr 2010
Posts: 1,503
Likes: 0
From: Southaven,Ms
could also be nylon from factory timing gears
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
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
Thread Starter
|
Senior User
Joined: Mar 2007
Posts: 316
Likes: 0
Alright, yesterday I did a compression check on the cold motor. Compression ranged from 220 psig to 180 psig with one cylinder at 155psig. I dont know what the compression should have measured but even 155 as the low was higher than expected. I aslo think that 220 to 155 is a red flag, but nothing I can deal with right now.
Let the engine do its heat soak thing. Pulled the plugs and it spun over like butter. Did a compression check again had a presuure gain of 15-20 psig all around. Put them back in and got the no start deal. At least know I know this is a compression related problem, I just dont know how to deal with it. Any thoughts.
Let the engine do its heat soak thing. Pulled the plugs and it spun over like butter. Did a compression check again had a presuure gain of 15-20 psig all around. Put them back in and got the no start deal. At least know I know this is a compression related problem, I just dont know how to deal with it. Any thoughts.
Senior User
Joined: Jul 2004
Posts: 216
Likes: 0
From: North Branch, MI
I had a hot start problem with the 302 in my 78 some time ago, replaced the ignition module, rotor, distributor cap, wires plugs, coil and the problem persisted. Finally I pulled the distributor and found that it did not turn freely at least as free as I thought it should so I replaced it with a rebuilt from Advanced Auto and have not had a hot start problem since.
Bob G
Bob G
Thread
Thread Starter
Forum
Replies
Last Post
dda140
1999 - 2016 Super Duty
3
Nov 25, 2014 09:54 AM
free_loaderz
1967 - 1972 F-100 & Larger F-Series Trucks
8
Sep 22, 2010 06:39 PM
1979fordf150
1973 - 1979 F-100 & Larger F-Series Trucks
9
May 23, 2005 07:35 PM
