460 hard start when warm
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 44
Likes: 0
460 hard start when warm
I have a 88' with a reman FI 460. When cold, it fires up right away, but after I run it up to operating temp, it won't fire very good. It cranks normal, but doesn't sound like it's getting good spark. I have a new cap, rotor, and bosch platinum plugs. I also replaced the manifold air temp sensor. The longer it sits and cools down, the easier it starts. It does it on both tanks, and the way it starts when it's cold, I don't think it's fuel related?
any ideas?
Kevin
any ideas?
Kevin
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
I had this problem on an 86 F250 460. It drove me crazy. I replaced the module, the starter switch, fuel pump relay, mine wouldn't do it all the time sometimes it would start fine warm, and started cold all the time. One day I was at a friends house and he said open the hood he pulled the dist. cap and grabbed the rotor and it had way too much play, it was a new rebuilt dist. we changed it out and problem ended. That was two years ago. It might be worth a check.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by kermmydog
I had this problem on an 86 F250 460. It drove me crazy. I replaced the module, the starter switch, fuel pump relay, mine wouldn't do it all the time sometimes it would start fine warm, and started cold all the time. One day I was at a friends house and he said open the hood he pulled the dist. cap and grabbed the rotor and it had way too much play, it was a new rebuilt dist. we changed it out and problem ended. That was two years ago. It might be worth a check.
Thread Starter
|
Freshman User
Joined: Oct 2005
Posts: 44
Likes: 0
I will check out the dist but I don't think that it has excessive play. What do you guys think the possibility of the timing having anything to do with it? I read yesterday about a guy who had a hard warm start problem that was caused by timing and a stretched t chain. Everything is new (except dist) so it might to dist too. I forgot to mention that it idles too high also, especially when it's warm? It cranks and cranks, and sounds like the timing is off when it finally fires, kind of stumbles and then takes off. What is the correct way to time it? Warm, in park, spout out. Then do you shut it off and replace the spout, or put it in while it is still running? Also, do you need to disconnect the battery after you time it to let the computer re-set itself?
thanks for your help,
Kevin
thanks for your help,
Kevin
Thread
Thread Starter
Forum
Replies
Last Post
DieselCamper
1973 - 1979 F-100 & Larger F-Series Trucks
19
Aug 25, 2016 01:43 PM
460jared96
1987 - 1996 F150 & Larger F-Series Trucks
4
Oct 11, 2014 09:26 PM
yewdall
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
5
Apr 21, 2012 10:18 PM
old timer 4x4
1973 - 1979 F-100 & Larger F-Series Trucks
31
May 25, 2006 07:39 AM
