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Little Red Truck Tha · 04-05-2011, 11:10 AM

CT,

Bob here (Little Red Truck). Mine is the 2wd, Chevy C3500, L80E, 7.4L, TBI that you fixed last year with the EGR switch.

Current issue is starting and low throttle miss-fire (45-50 mph). All plugs, wires, cap, rotor are new. No codes from Snap-On scanner. Scope showed good voltage thru wires. Snap-On could not find gear selected (Park) and searched P-L1 continuously. Cable that indicates gear selected in dash is broken. Contacts in P-R-N-D switch on column were cleaned an lubed with Di-electric grease. Ran compression check: 153,166,146,158,152,144,152,152 (1-8). Blocked EGR vac line and verified EGR open/close.

Nothing changes miss-fire.

Any ideas on where to go next?

04-05-2011, 11:10 AM	#15
Little Red Truck Tha Registered User Join Date: May 2010 Location: Daytona , FL. Posts: 3	Re: 89 tbi running & starting problem CT, Bob here (Little Red Truck). Mine is the 2wd, Chevy C3500, L80E, 7.4L, TBI that you fixed last year with the EGR switch. Current issue is starting and low throttle miss-fire (45-50 mph). All plugs, wires, cap, rotor are new. No codes from Snap-On scanner. Scope showed good voltage thru wires. Snap-On could not find gear selected (Park) and searched P-L1 continuously. Cable that indicates gear selected in dash is broken. Contacts in P-R-N-D switch on column were cleaned an lubed with Di-electric grease. Ran compression check: 153,166,146,158,152,144,152,152 (1-8). Blocked EGR vac line and verified EGR open/close. Nothing changes miss-fire. Any ideas on where to go next?