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Elder User
Joined: Sep 2003
Posts: 641
Likes: 1
From: Louisiana
It still has the problem. Haven't had time to mess with it. Had more work here with hurricanes and other things, just bought a new truck. It's still a side project and will start on again in the warmer months and pull the engine out again and go through it one more time. Will give me time to install the transfer case and mod the tranny for it.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 4
From: Almost Heaven
It still has the problem. Haven't had time to mess with it. Had more work here with hurricanes and other things, just bought a new truck. It's still a side project and will start on again in the warmer months and pull the engine out again and go through it one more time. Will give me time to install the transfer case and mod the tranny for it.
Mountain Pass
Joined: Mar 2003
Posts: 169
Likes: 0
From: Klamath Falls, Oregon
I didn't read all 7 pages, but here is my guess. You have all the rockers adjusted way to tight. As soon as it starts it pumps up the lifters hanging all valves open and dies. If you wait an hour the lifters bleed off and you can do it all over again. When it starts and then dies and you pull all plugs it gives enough time for the lifters to bleed down again allowing it to start and die.
EOIC
Exhuast valve openning--adjust intake valve
Intake valve closing -- adjust exhaust valve
EOIC
Exhuast valve openning--adjust intake valve
Intake valve closing -- adjust exhaust valve
Senior User
Joined: Sep 2003
Posts: 149
Likes: 0
I don't know if the problem has been solved yet but I really dont have time to read all the post. I had a 93 bronco with the same f i system. The vacuum line to the map sensor rotted and clogged the nipple on the intake manifold causing the same problem you're having. Check to see if your getting good vacuum to the map sensor, and make sure its hooked up to the right place. No vacuum at the map will simulate wot and dump lots of fuel into the cylinders. Good luck, Chris.
Elder User
Joined: Nov 2008
Posts: 639
Likes: 0
From: houston
And I thought I was the only one. I had the same problem in my `90 F150. I found out that there was a short in the wiring harness/ignition switch.It would run then die. I took the small wire frome the starter relay off and connected a start button under the dash,running one wire to the relay and the other to the fuse box.Have to turn the key on then push the button to start it.Ran good like that until I put the new motor in, then it started to do it again.I went through the same ordeal and thats how I found this site.Anyway,this time I traced it to the new MSD distributor that I put in.It had a bad Hall effect sensor in it. I put the old distributor in and it`s running good now. So try taking the small wire off after you get it running again and see if that works,if not try a distributor that you know is good.
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Senior User
Joined: Sep 2004
Posts: 197
Likes: 0
From: Martins Creek, PA
I haven't read all the pages of this thread. But I got as far as questions about your compression being low. My question is did you gap your rings? If they are not gapped correctly they may be causing the engine to bind up. You've said it gets to the point where the starter won't turn it over anymore........
Senior User
Joined: Sep 2004
Posts: 197
Likes: 0
From: Martins Creek, PA
I didn't read all 7 pages, but here is my guess. You have all the rockers adjusted way to tight. As soon as it starts it pumps up the lifters hanging all valves open and dies. If you wait an hour the lifters bleed off and you can do it all over again. When it starts and then dies and you pull all plugs it gives enough time for the lifters to bleed down again allowing it to start and die.
EOIC
Exhuast valve openning--adjust intake valve
Intake valve closing -- adjust exhaust valve
EOIC
Exhuast valve openning--adjust intake valve
Intake valve closing -- adjust exhaust valve
Do a compression test right after it dies, and if its zero, then that's a good direction. But unless the battery is dieing and causing the slow crank, it would crank faster, not slower with stuck open valves.
Junior User
Joined: Dec 2008
Posts: 51
Likes: 0
I have read 1/2 the post, and will ask a question related to Compression> early in th post you mentioned 80/90 psi. Are you still having that? I had a similar problem several years ago on a different model motor, but what it ended up being was a pin for the Cam to timing gear didn't set properly and shifted. What it would do is give me erratic run occasionaly, and then once in a while when the sprocket lined up with the cam, the motor would appear to run ok.
Just 2 cents worth.
db916gt..
91 F250 SC 4WD E$od 7.5l
Just 2 cents worth.
db916gt..
91 F250 SC 4WD E$od 7.5l
Elder User
Joined: Feb 2001
Posts: 502
Likes: 0
From: atl
Hopefully he got it fixed and didn't resort to going back to carb.....
