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Author Topic: Hard starting after warm up  (Read 549 times)

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Offline lt. dan

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Hard starting after warm up
« on: June 22, 2013, 07:55:19 PM »
I have an 88 W150 with a 318 tbi. It is stock with 134k miles. I am having a bad time restarting it after it runs for a while (20 minutes or so).  Sometimes I can bump the key and it will start, but if it sits more than 5 minutes it cranks and cranks but will finally catch. I replaced the distributor because it was corroded and the Hall Effect sensor was as well. (I did clean it up and had same problem but replaced it and installed a rain deflector over the distributor.) I removed temp sensor wires and set timing to 10 btc according to the sticker on the hood. I have replaced the fuel pump and lines, rebuilt the tbi and a set of plugs and wires. I think the timing may need advanced, but I haven't had to think about any of this in 25 years. Once it starts, it runs fine, never a stutter or stammer. the IC motor was replaced when i rebuilt the tbi. I did not replace the cap, rotor, plugs or plug wires when I replaced the distributor.
Any suggestions on this problem will be much appreciated, and I will do any testing suggested.
Thanks for your help.
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Offline DODGEBOYS

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Re: Hard starting after warm up
« Reply #1 on: June 22, 2013, 08:53:36 PM »
l,d say either a bad coil or the connector at the back of the right valve cove / their known to corrode and short out

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Offline lt. dan

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Re: Hard starting after warm up
« Reply #2 on: June 22, 2013, 09:05:30 PM »
I will test the coil, and the connector, is that the big 100 or so pin block? Can I clean with baking soda? Or what would you suggest?
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Offline lt. dan

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Re: Hard starting after warm up
« Reply #3 on: June 23, 2013, 08:31:04 PM »
I have tested the coil cold, and the primary show 2.0 ohms and the secondary side shows 8.33k ohms. It shows out of specs so i replaced it with a new one.  I started checking the connectors at the rear of the right valve cover, but am not sure which one I should be paying the most attention to. Also, is the ballast resistor built into the SCC?
Thanks 
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Offline 75dodgepowerwagon

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Re: Hard starting after warm up
« Reply #4 on: June 26, 2013, 12:49:03 PM »
I kind of sorta had same problem.  It always fired right up
first time and ran all day long.  Until I let it sit for 5 min.
Then it would not start again.  Had to wait for awhile then
It would start again. 

Problem was starter.  It would get hot from exhaust pipe
causing starter to draw to many amps.  But when it cooled
down, it would start.

Just a thought....

Offline sls001

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Re: Hard starting after warm up
« Reply #5 on: June 26, 2013, 01:35:08 PM »
I kind of sorta had same problem.  It always fired right up
first time and ran all day long.  Until I let it sit for 5 min.
Then it would not start again.  Had to wait for awhile then
It would start again. 

Problem was starter.  It would get hot from exhaust pipe
causing starter to draw to many amps.  But when it cooled
down, it would start.

Just a thought....

In his description of the issue his engine is cranking over fine.

Offline 75dodgepowerwagon

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Re: Hard starting after warm up
« Reply #6 on: June 26, 2013, 02:05:11 PM »
In his description of the issue his engine is cranking over fine.
That was the most screwed up part about it.  It would
crank until battery died.  I never even thought it was starter.
It went on for about a year.  I never turned it off when I went to
town.  Finally, starter died.  I replaced it and it always starts now.
The whole reason I went all msd was cause I thought it was ignition
system.  Imagion how pissed I was after being stranded in town after
spending all that money.  Almost sold truck.