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87 6.9 Hard starting

2240 Views 5 Replies 4 Participants Last post by  tim94f250
For the past few days my truck [87 f250] has been giving me a fit in the morning.I even ran the batt.s down one time!I had the intake gaskets replaced a while back,after that for some reason the wait to start light quit working.What i've been doing is cycling the plugs by waitng for the clicking sound under the hood[I do this twice]she usually fires up!After i get it going it'll be fine all day.I have noticed that lately when i start the truck almost every time it stumbles a little.
I have checked the fuel lines and yesterday i replaced the rubber
hoses between the injectors.They were in bad shape,but still have the problem.It seems like its turning over good,i had the batt.s checked and they are fine.
Thanks in advance for any help!!

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If somebody was working on the top end of the engine it could be the glow plug controller was disconnected. The ground wire on the GPC is very important.

I replaced one glow plug (Motorcraft only) and at the same time cleaned the ground that goes to the engine from the GPC and it really improved my glow plug cycling. 87s have the newer 7.3 GPC.

It previously was on for a few seconds and then cycled rapidly. After cleaning the ground, it is on for 10 to 15 seconds and cycles much slower.

Then I cleaned the positive battery cable junction and the engine whirs right over and starts great.
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