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Unread 09-01-2011, 03:26 PM   #1
sbarrese33
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1987 Wagoneer runs hot wont start

I have a 1987 Grand Wagoneer with a 360 motor. Starts right up..eventually gets up to 225 dgrees...still runs but when shut down wont even crank...soon as the engine cools off starts right up with no problem. Replaced radiator, heater core, therm, starter, selenoid, battery cables, and the timing is good...ready to pull my hair out....any suggestions??

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Unread 09-01-2011, 07:06 PM   #2
pleontks
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look at fan clutch for overheating. look at ignition box for not starting.
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Unread 09-01-2011, 11:01 PM   #3
Dr. Marneaus
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Something is causing you to overheat, which is the source of not starting.

Have you looked at your spark plugs to see the condition? They can tell you if you are running rich or lean (lean causing increased heat).

Also, you have obviously replaced the common points of failure, but have you checked out the condition of the coolant passages on the block? pulling the intake manifold and taking a look will let you know how heavily corroded they are. At the very least I'd suggest a complete coolant back flush to try and get any crap out of the system.

Next, I'd check the water pump. Not sure how many miles you have on it, but sometimes the impeller can wear down to the point where there are no blades on it, and it cant push the coolant through the block. Also heard of the incorrect year water pump installed, which had the impeller pushing the wrong way.

I'd check your plugs, check for vacuum leaks (something that can lead to a lean condition) and possibly replace the water pump.

The fan clutch as mentioned above is also a good point to start, however it will really only be a cause if yuo are only overheating at idle or in traffic. The fan clutch doesnt do a whole lot at highway speed, as there is plenty of air moving through the radiator, but if it is overheating at idle or in traffic, where the fan actually pulls air through the rad, it may be the culprit.

Hope this helps!

I replaced my radiator and theromostat (with a 185 degree unit) and my 1973 wag doesnt even pass 195 in the 115 degree vegas heat.
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Unread 09-02-2011, 10:28 PM   #4
temps425
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First thing I would do is re-bleed the cooling system. This is the most common problem in my experience. As far as the no start while hot, that is strange. Only thing I can think of is the ignition module. I can't think of any reason why the ignition would change based on the temp of the motor.
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Unread 09-03-2011, 12:49 AM   #5
Dr. Marneaus
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Quote:
Originally Posted by temps425 View Post
First thing I would do is re-bleed the cooling system. This is the most common problem in my experience. As far as the no start while hot, that is strange. Only thing I can think of is the ignition module. I can't think of any reason why the ignition would change based on the temp of the motor.

No start while hot can be that the ignition timing is too far advanced once it warms up.
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Unread 09-03-2011, 02:29 AM   #6
Crazy4Wheelin
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How bout vapor locking causing the no start after hot? The full size jeeps maintain a crapola amount of heat under the hoods after you turn them off. I ended up relocating my fuel filter on my exs because it would vapor lock all the time even when it didn't seem to be overheating. Fyi clear filters work wonders if you are wondering if it is vapor locking since you can see them fog up.
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Unread 09-03-2011, 08:08 AM   #7
sbarrese33
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Going to check into the fan clutch and water pump....evrything else is good....cant even get the engine hot now in cool weather but on a hot day it gets up there and then engine wont crank....thanks for the suggestions...stay tuned
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Unread 09-09-2011, 08:21 AM   #8
sbarrese33
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So before I even had a chance to do the fan clutch and water pump....I am driving it and now that the weather is a bit cooler the temp is barely getting out of the blue on the temp gauge....but I turn the engine off and then try to restart...won't crank....soon as it cools off...it fires right up. Thing that is bothering me is that it is not that hot...not like before anyway. Any suggestions? Is this engine shot?...doesnt make sense since it runs fine...just wont crank when turned off.
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Unread 09-09-2011, 08:50 AM   #9
sbarrese33
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.....also we put a wrench on the motor when it was hot and could barely move it...but when cooled off move fine...if that helps.
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Unread 09-09-2011, 01:22 PM   #10
Dr. Marneaus
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Percolation? That wouldnt explain it being hard to turn though. Could still be vapor lock or flooding it can actually put fluid into the cylinder making it very difficult to turn.

so it wont even crank when hot? Have you tried a new starter?
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Unread 09-09-2011, 01:51 PM   #11
sbarrese33
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Starter is new...you can hear it trying but wont turn the motor...20 mins later when cools off...fires up like nothing ever happened....also keep in mind the engine runs fine...doesnt over-heat, doesnt stall...but when you turn the key off and try to restart when hot...wont crank.
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