Hard Start When Hot --
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Senior User
Joined: Feb 2002
Posts: 224
Likes: 0
From: Mill Creek, WA
Hard Start When Hot --
Ok, background again: 1990 F150 4x4 5.0 AOD. New engine and some accessories, new tranny. Newer alternator. Unsure of battery age, but it's a godo size 1000 CA battery.
Symptoms: Truck cranks over fine when cold, but slower when hot. Finally tonight, after a long drive I shut it off and it wouldn't restart. Cranked over slow and then slower. Let it set for 5-10 mins and it cranked fast enough to catch and start.
Tried so far: Never really thought too much of it, finally got around to trying new battery cables, I put #1 cables on (big!). I ran the positive cable over to the solenoid as it was before, and then I ran the negative cable over to the fender, and installed an eyelet on the old cable and put that on the battery as well, figuring it would still ground to the engine block/starter, etc as well as having a really good ground. Still did the same thing, but it didn't bother me enouh to do anything else until tonight.
I'm going to have AutoZone put one of there testers on tomorrow to see hwo the charging system looks, but I'm leaning towards starter right now.
Symptoms: Truck cranks over fine when cold, but slower when hot. Finally tonight, after a long drive I shut it off and it wouldn't restart. Cranked over slow and then slower. Let it set for 5-10 mins and it cranked fast enough to catch and start.
Tried so far: Never really thought too much of it, finally got around to trying new battery cables, I put #1 cables on (big!). I ran the positive cable over to the solenoid as it was before, and then I ran the negative cable over to the fender, and installed an eyelet on the old cable and put that on the battery as well, figuring it would still ground to the engine block/starter, etc as well as having a really good ground. Still did the same thing, but it didn't bother me enouh to do anything else until tonight.
I'm going to have AutoZone put one of there testers on tomorrow to see hwo the charging system looks, but I'm leaning towards starter right now.
Senior User
Joined: May 2002
Posts: 484
Likes: 1
From: Garden Grove USA
Hard Start When Hot --
If the cranking is simply slow, you may want to test the starter. If the cranking is kinda jerky check you r timing. If it is advanced too much, the engine will run great and start fine when cold, but when hot the spark will actually be so advanced that detonation occurs before the cylinder is at TDC, meaning that the compression detonation is trying to spin the engine backwards, causing the cranking to be very jerky and hard to start.
Retard the timing just a smidge and see what happens.
Good luck
Retard the timing just a smidge and see what happens.
Good luck
Thread Starter
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Senior User
Joined: Feb 2002
Posts: 224
Likes: 0
From: Mill Creek, WA
Hard Start When Hot --
I actually just got back from AutoZone, had them put it on their charging system machine ... low and behold -- it was just the battery. Apparently it wasn't holding a good charge, but it was enough to handle it when cold, btu not when hot.
Problem seems to be solved now.
Problem seems to be solved now.
