Does he have a UDP? Is it possible that the water pump is going out? If he has a UDP its possible that the water pump isnt turning fast enough. Have you tried to hold the throttle at cruising RPM while the truck is sitting still to see if it still rises?
'02 GMC RCStepSide 4.8 , Thumpr Cam , 3200 Stall , OBX LTs , MSD Wires , TrueTrac , 4.10s , 3/5 Drop , bolt in traction bars by LSX Powersports , EFI Live tune by LSX Powersports
15.2 @ 90 , 2.3 60' (Only mods at this time , LTs)
Make sure the belt routing is correct. The water pump turns the opposite direction as the crank.
Jeff
98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110
If he has a stall convertor, hopefully he has an auxillary cooler for it.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
After I read the issue but before I read any responses my diagnosis was an air pocket. I have no issues with this any longer now that I vacuum fill these. The LS is so easy to get air locked because of the low tstat mounting.
I'll start with belt routing and move straight to doing what red said. Brand new pump probably less then 500 miles and isn't weeping out the weep hole... ( LS motors have weep holes right? Lol)
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