87 tbi no start at times - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rwmiller72 · 04-03-2013, 08:28 PM

Truck runs good most of time, when rains or is humid will not start? I think I have an ignition switch problem,anyone have suggestions?

**rs74** · 04-03-2013, 10:23 PM

Cracked distributor cap? Getting moisture inside the cap.

Low87 · 04-04-2013, 10:43 AM

What Roy said. Check the ICM connection on the dizzy. Might not be making enough contact. Open it up, if there's surface rust that's likely your problem. Lightly sand it off (both pieces) then use dielectric grease on the contact area before screing back down.

motornut · 04-04-2013, 10:52 AM

my 87 had issues like that
i even replaced the pump
got stuck again,
found a cut/nicked/hard baked area in the power line over the drivers rear wheels arch

Low87 · 04-04-2013, 11:27 AM

Good point John. Had a starting issue with my K5, couldn't figure it out til we dropped the tank. Some low IQ PO had spliced the trailer plug ground into the fuel pump ground wire. Sometimes the connection was loose enough to cause a problem.

**Desert1957** · 04-05-2013, 11:04 AM

Quote:

Originally Posted by rwmiller72

Truck runs good most of time, when rains or is humid will not start? I think I have an ignition switch problem,anyone have suggestions?

When you say "Will not start" do you mean will not crank over? Or cranks over and will not start?

Desert

turbo350 · 04-05-2013, 07:50 PM

Quote:

Originally Posted by rwmiller72

Truck runs good most of time, when rains or is humid will not start? I think I have an ignition switch problem,anyone have suggestions?

I had the exact same issue on my '87 tbi 350. I put a new ignition module and dist cap. Problem was solved.

04-03-2013, 08:28 PM	#1
rwmiller72 Registered User Join Date: Jan 2011 Location: Godley,Texas Posts: 3	87 tbi no start at times Truck runs good most of time, when rains or is humid will not start? I think I have an ignition switch problem,anyone have suggestions?

04-03-2013, 10:23 PM	#2
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: 87 tbi no start at times Cracked distributor cap? Getting moisture inside the cap. __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

04-04-2013, 10:43 AM	#3
Low87 been here longer than Liz Join Date: Feb 2000 Location: Broken Arrow, OK Posts: 2,437	Re: 87 tbi no start at times What Roy said. Check the ICM connection on the dizzy. Might not be making enough contact. Open it up, if there's surface rust that's likely your problem. Lightly sand it off (both pieces) then use dielectric grease on the contact area before screing back down. __________________ ~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin

04-04-2013, 10:52 AM	#4
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: 87 tbi no start at times my 87 had issues like that i even replaced the pump got stuck again, found a cut/nicked/hard baked area in the power line over the drivers rear wheels arch __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

04-04-2013, 11:27 AM	#5
Low87 been here longer than Liz Join Date: Feb 2000 Location: Broken Arrow, OK Posts: 2,437	Re: 87 tbi no start at times Good point John. Had a starting issue with my K5, couldn't figure it out til we dropped the tank. Some low IQ PO had spliced the trailer plug ground into the fuel pump ground wire. Sometimes the connection was loose enough to cause a problem. __________________ ~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin



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