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@Papakb: the cycling seems as you describe when starting the vehicle. I have a battery powered test light to see if the glow plugs still have life in them (do this before considering GPC replacement). How spendy are the green label KDS boxes (and the S3 box)? Maybe it would be a good idea to...

My bad...it is a 1987 M998 HMMWV, the real deal. From this day hence I will refrain from calling it a hummer! I will look at the TM and this forum for testing a bad GP controller. I posted a shot of it after it just got done pulling a crippled M1008 Chevy up a 22% grade with 3 hairpin turns.

One more question for you guys....do you recommend buying a GP removal tool to remove hummer glow plugs?

will do. thanks for the replies fellas.

Got a source for some military GP's? I found out the plugs I bought were 12 v and wont work anyhow. I am located in S central washington on the columbia river. sounds like you've replaced these before.

The M998 that we have down here at work runs well, but is hard starting. I just picked up Champion 191 CH238 glowplugs for replacements, anybody out there use these? Or someone out there recommend something else? Should anything else besides glowplugs be changed? We are also going to put a...