Won't start when hot

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GS..On your thread in another section I suggested a possible rebuild of your starter.

In this thread I just noticed you replaced it 2 years ago. What did you replace it with ? New ? used ? reman ?

The reason I ask is that it still sounds like a starter issue to me.

I think you have 2 issues, A) sometimes it won't start & B) overheating issue. And I don't 'think' they are related. Don't look for one bullet to fix this. Fix one problem & then go to the other.

John
 
U need a new fuel pump..!!!

...

U smell the gas smell around the cruiser, then there is a leak somewhere. Fuel pump is failing or feed lines are leaking.
 
hj60 said:
Mountain Goat-
FYI: 3f engine is batch-fire port injection with a cold start injector.
It's got 7 injectors. :)
Click to expand...

I call Bull s*** on your batch-fire theory;p
 
Update:

I had a fellow clubber (thanks hj60! :cheers:) look at it last weekend, and we couldn't really duplicate the problem. Well, when I arrived the engine was hot. I was unable to start it when I turned the key once.

My friend got in and tried it while holding the shifter in park (the shifter is a bit sloppy), and it started. But I don't know if it had cooled off just enough, or maybe the NSS is starting to go.

He also tightened the two screws that lead to the fusible links, but otherwise, the battery and cables were in good shape.

I'm heading to my club's wrenching day on Sunday with a new radiator to put in. I'll also be getting some new lube in the fan clutch, and replacing the thermostat.

I'll keep yall updated as to what we find out.
 
UPDATE:

Yesterday I took it to our club wrenching day. On the agenda, replace the radiator, thermostat, upper t-stat housing, some hoses, flush the old gunk out of around the block, and add new heavy duty lube to the fan clutch.

One thing that was interesting, the old t-stat had pretty much just blown up:

828900293_231a07de5c.jpg


After about 6 hours, all the new stuff was in, and the system filled with water:

828845817_e6f07eb757.jpg


We started it up to make sure there weren't any leaks, and let it run. It stayed cool as can be, and no leaks. Then we shut it down, drained it, and put in the coolant. When we tried to start it to burp the system -- no go.

Apparently the no-start issue was NOT entirely-heat related. :doh:

The guys spend a couple more hours poring over the wiring diagrams, testing voltage, various wires and connections. Eventually, they tried bypassing the NSS -- and it started!

So for now, it remains bypassed. We'll see if that was the problem. If it occurs again, we'll know it wasn't, and it was just that enough time had passed, and it started coincidentally.
 
Yet another (long overdue) update:

I had STILL been dealing with this issue. Whenever it got hot out (which, in Phoenix, is a LOT), it wouldn't start. No crank, no nothing. I got dash light, and the voltage was at 11V.

If I let it sit for a few more hours, it would start.

I also found if I popped the hood, and let it air out, it would usually start.

Someone suggested it might be corroded battery cables. So we replaced the main ones from the battery. Didn't help.

So I bought the full set of heavy duty cabled from Mark:
https://forum.ih8mud.com/merchandise-storefront/343236-fj60-fj62-heavy-duty-battery-cable-sets.html

We only managed to get 3 of 5 installed. One was too much of a pain to access (battery negative to motor mount), and the other we just couldn't find (head to firewall).

Nonetheless, I'm pretty sure the culprit was the starter to frame ground. The old one was hard and pretty nasty.

The weather has been in the upper 90s, and I haven't been popping the hood. So far, so good. It's supposed to be in the 100s this weekend. That will be the true test.
 
Did you replace the fuel pressure regulator? Hard hot starting can sometimes be caused by this. Or maybe a dirty fuel pump sock.
 
Heartworm said:
These are wild guesses. I have heard of starters causing problems when they get hot. I think what happens is the armature gets hot and expands and thus binds.
Click to expand...

I can attest to this happening when starters get hot. Running headers in my Chevy with no heat protection for the starter causes it to get too hot. If the engine has come up to temp and is shut off it usually has to sit for 10 or 15 minutes before it will crank again and when it does it's fairly sluggish. I always have to fill up with gas on the way to work before it has warmed up or I sit at the pump forever waiting for it to cool.

I'm fairly sure the starter would have to get pretty hot before it wouldn't crank, more so than it would with an engine that's just running a little hot but it might be enough to tip it over the edge. It's likely one of those issues that turns out to be a few small problems that snowball into one big one. :idea:Hey, maybe that would fix your problem. Carry a few snowballs around with you and throw them under the hood to cool it off.

Summit also sells starter blankets for fairly cheap. http://www.summitracing.com/parts/SUM-350118/ Worth a try for not too much dough and could help narrow down your problem.
 
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