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To check for a broken ps pump shaft, iirc, disconnect serpentine belt & see if pulley will pull out some. Belt when in place will tend to hold pulley in place even tho shaft broken.

I armstronged mine a few miles to a repair shop when the power steering pump went. Not as bad as I thought it would be .Pretty slow trip tho .One ton dually .(Someday I,ll get sig up to speed)

Sorry if I was off course . Misread Buddy,s post to check for lift pump operation with relay pulled . Was trying to say wiring diagram shows there would be, directly thru ops once ops points closed I guess we all know that..

Wiring diagram for a 97 shows a hot wire from ecm-b (hot always) straight to ops , so once oil pressure closes ops should have power to fuel pump thru grey wire going directly to pump . (also shows a parallel grey coming from relay 2nd power source to pump).

Amen

Doc Recall you & Gmctd doing some tests to demonstrate there being 2 circuits . Good info.

Was told by gmctd that ops circuit is redundant ,parallel circuits,one thru ops but also one thru pcm & relay .

Wonder if on the long hills ground speed is bled off more & heated air from rad not being forced over fan clutch thermostat as quickly resulting in greater lag in clutch engaging?

Love these posts .

Here in Ontario over 4600 kg on the trailer wheels a restricted kind of an A drivers licence now required. Similar to BC I believe .Who Knows ,Manitoba may be next . I have a 30 foot & its no fun sometimes on hills & bucking head wind s.

Running straight water will lower the boil over temp .

Could you get a little more travel by possibly removing padding or floor mat behind clutch peda l?

I know I,m belabouring a point , but I seem to recall an instance here or on other site where key on IP gear had sheared in such a way that gear still turned the pump but way out of time ?

Timing gear key sheared ? Just another guess . Believe it was War wagon who had one with the cps turned 180 degrees in the socket causing a no start . More guesses I guess.

Try starting in limp mode (extended cranking) with optic sensor unplugged ?

Just reread that you tried with cps disconnected.

There was an instance here not long ago where the crank position sensor was installed 180 degrees out .

Wow . May never get this thread straightened out .

Recall gmctd explaining a few years ago that the sensitve unlock was built into the obd2,s to prevent hollow trans output shaft from twisting off, or something to that effect.

Dont remember if vacuum lines hooked up incorrectly could cause such a problem?