93 stock 2wd; issues with grid htr, OD

Christopher P · 07-04-2009, 03:29 AM

My "wait to start" is a sometimes thing, and flickers sometimes when driving down the road. coupled with this, the truck will not shift to OD when the "wait to start" is flickering. The other day I was travelling thru town, hit a bump and the "WTS" light went out, and the OD was again selectable and working. Today we are back to same problems. Cleaned all the connectors behind dash and under hood. I,m starting to think PCM. Any ideas?

***prototype427*** · 07-04-2009, 06:54 AM

Im new to diesels but is it possible to disconect the heater and see if the problem goes away? or how about disconecting the the sensor where it gets its signal to activate the heater (for trouble shooting puposes only)?I worked on gas engines most of my life so im trying to learn as fast as i can but thought id throw some ideas out. I hope this helps

Good Luck!

__________________
'79 F-250 Crewcab project on 38's with a '90 Cummins, turned up pump, guages, and now looking for an I/C, and needing a turbo housing

Philip · 07-05-2009, 09:13 PM

The PCM is located behind the battery. Unhook the main wiring plug. Look into the female side. If you see any terminals that are not round. Take a very small screw driver and gently bend them back to a round shape. Then see if the problems go away.

__________________
93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto, 3:07's axles, 2" skyjacker lift, B&W flatbed

gotacummins · 07-06-2009, 09:19 PM

it is possible to disconnect the grid heater, people in the south just keep it disconnected

__________________
"If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's

***unixcowboy*** · 07-07-2009, 06:26 PM

Some of us in the north do the same thing....
Mine's MIA...

Made it through last winter with no problems..Truck turns over 3 cylinders instead of 2 before starting.

__________________
'93 D250 CC HX-40 60/65/17 w/hx50 flange - hit 57 held 55 psi OOPS => 6x16's <=, 366 spring w/1 turn clipped, power screw bottomed-backed off 1/2 turn, Ol Smokey's power pin(modified), removed limit washer, smoke screw fully out, starwheel 4 up - modified top to get pin higher, '94 built trans - clutches and some hard parts, trans cooler in front of radiator, 4510 w/4 1/2" intake and heat shield, htr grids MIA, 4" dp -> 5" pipe -> 5" Stack, 285's rear 265's front

07-04-2009, 03:29 AM	#1 (permalink)
Christopher P Newbie Join Date: Jul 2009 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts Christopher P's Truck Pics	93 stock 2wd; issues with grid htr, OD My "wait to start" is a sometimes thing, and flickers sometimes when driving down the road. coupled with this, the truck will not shift to OD when the "wait to start" is flickering. The other day I was travelling thru town, hit a bump and the "WTS" light went out, and the OD was again selectable and working. Today we are back to same problems. Cleaned all the connectors behind dash and under hood. I,m starting to think PCM. Any ideas?

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07-04-2009, 06:54 AM	#2 (permalink)
*prototype427* Weekend Wrencher Join Date: Jun 2009 Location: Craig, CO Posts: 18 Thanks: 2 Thanked 0 Times in 0 Posts prototype427's Truck Pics	Im new to diesels but is it possible to disconect the heater and see if the problem goes away? or how about disconecting the the sensor where it gets its signal to activate the heater (for trouble shooting puposes only)?I worked on gas engines most of my life so im trying to learn as fast as i can but thought id throw some ideas out. I hope this helps Good Luck! __________________ '79 F-250 Crewcab project on 38's with a '90 Cummins, turned up pump, guages, and now looking for an I/C, and needing a turbo housing

07-05-2009, 09:13 PM	#3 (permalink)
Philip 1ST GEN MODERATOR Join Date: Nov 2007 Location: Indiana Posts: 5,104 Thanks: 2 Thanked 130 Times in 120 Posts Philip's Truck Pics	The PCM is located behind the battery. Unhook the main wiring plug. Look into the female side. If you see any terminals that are not round. Take a very small screw driver and gently bend them back to a round shape. Then see if the problems go away. __________________ 93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto, 3:07's axles, 2" skyjacker lift, B&W flatbed

07-06-2009, 09:19 PM	#4 (permalink)
gotacummins Cummins Nut Join Date: May 2008 Posts: 478 Thanks: 18 Thanked 3 Times in 3 Posts gotacummins's Truck Pics	it is possible to disconnect the grid heater, people in the south just keep it disconnected __________________ "If JESUS bore the cross and died on it for me, ought I not to be willing to take it up for Him?" 93 D250 club cab AT HE351CW, 4" DP and custom exhaust ,cooler tubz, Denny T pin, 3200k spring, BLK H2's

07-07-2009, 06:26 PM	#5 (permalink)
*unixcowboy* Diesel Freak Join Date: Apr 2007 Location: Lansing, Mi Posts: 970 Thanks: 0 Thanked 6 Times in 6 Posts unixcowboy's Truck Pics	Some of us in the north do the same thing.... Mine's MIA... Made it through last winter with no problems..Truck turns over 3 cylinders instead of 2 before starting. __________________ '93 D250 CC HX-40 60/65/17 w/hx50 flange - hit 57 held 55 psi OOPS => 6x16's <=, 366 spring w/1 turn clipped, power screw bottomed-backed off 1/2 turn, Ol Smokey's power pin(modified), removed limit washer, smoke screw fully out, starwheel 4 up - modified top to get pin higher, '94 built trans - clutches and some hard parts, trans cooler in front of radiator, 4510 w/4 1/2" intake and heat shield, htr grids MIA, 4" dp -> 5" pipe -> 5" Stack, 285's rear 265's front