85 silverado/starting problems

pahokeejoe · 05-11-2008, 03:52 PM

Hey guys, new to this forum and in desperate need of help. My 305 silverado will start at times and runs perfect. Other times she will not start. When she won't start there is no spark to the plugs. Now here is what I have done. ( rebuilt the dist. completely, replaced the dist. components three times, swapped computer, check ign batt to dist and computer when she won't start and every time the voltage is good even while cranking, replaced timing gear and chain) At times I will go to start to no avail. Sometimes try a couple of hours later and she'll start and run great. Go out the next morning and she won't start. Sometimes it will be days too weeks before she'll start again. I also have checked all wires involved with the computer,dist and ign and all test good. Outside temp seems to have some effect as too when it quits starting, but she'll do the same in the summer months as well. Any suggestions? Joe

88fivespd · 05-11-2008, 10:10 PM

I would guess the ignition coil or the ignition module. I would buy the cheapest new coil I could find and try that first.

pahokeejoe · 05-12-2008, 03:45 AM

I,ve replaced the coil and mod three times. Fuel pump is new and good,no problem there. When she starts, I can get on down the road, kick in the four barrel and scoot. Funny thing is, it never stalls while driving.

Chevy_Finatic79 · 05-12-2008, 06:13 AM

maybe you have a loose wire going to the pick up coil. i bought a new dizzy before and one of the wires going to the pick up coil was never soldered from the get go but mine just flat out wouldnt start

Case 7230 · 05-13-2008, 04:48 AM

Check for loose/dirty/broken ground wires between body and engine. Check also for defective ign. switch and defective/loose/dirty ign switch plug connector. You may be getting voltage at coil but not enough current. Just my guess.

pahokeejoe · 05-14-2008, 03:55 AM

thanks for info: I changed out the ign switch because it's the only thing I haven't changed. Seems to be better. I'm going to redo the grounds from body to engine and see if that helps. If she'll crank and run everyday for a couple of weeks, I might put a little faith in her and take a long drive.

05-11-2008, 03:52 PM	#1 (permalink)
pahokeejoe Junior Member Join Date: May 2008 Location: Indian Land, SC Posts: 3	85 silverado/starting problems Hey guys, new to this forum and in desperate need of help. My 305 silverado will start at times and runs perfect. Other times she will not start. When she won't start there is no spark to the plugs. Now here is what I have done. ( rebuilt the dist. completely, replaced the dist. components three times, swapped computer, check ign batt to dist and computer when she won't start and every time the voltage is good even while cranking, replaced timing gear and chain) At times I will go to start to no avail. Sometimes try a couple of hours later and she'll start and run great. Go out the next morning and she won't start. Sometimes it will be days too weeks before she'll start again. I also have checked all wires involved with the computer,dist and ign and all test good. Outside temp seems to have some effect as too when it quits starting, but she'll do the same in the summer months as well. Any suggestions? Joe

05-12-2008, 06:13 AM	#4 (permalink)
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 432	maybe you have a loose wire going to the pick up coil. i bought a new dizzy before and one of the wires going to the pick up coil was never soldered from the get go but mine just flat out wouldnt start __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

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05-11-2008, 10:10 PM	#2 (permalink)
88fivespd Full Member Join Date: Jan 2008 Posts: 34	I would guess the ignition coil or the ignition module. I would buy the cheapest new coil I could find and try that first.

05-12-2008, 03:45 AM	#3 (permalink)
pahokeejoe Junior Member Join Date: May 2008 Location: Indian Land, SC Posts: 3	I,ve replaced the coil and mod three times. Fuel pump is new and good,no problem there. When she starts, I can get on down the road, kick in the four barrel and scoot. Funny thing is, it never stalls while driving.

05-13-2008, 04:48 AM	#5 (permalink)
Case 7230 Senior Member Join Date: Dec 2007 Posts: 157	Check for loose/dirty/broken ground wires between body and engine. Check also for defective ign. switch and defective/loose/dirty ign switch plug connector. You may be getting voltage at coil but not enough current. Just my guess.

05-14-2008, 03:55 AM	#6 (permalink)
pahokeejoe Junior Member Join Date: May 2008 Location: Indian Land, SC Posts: 3	thanks for info: I changed out the ign switch because it's the only thing I haven't changed. Seems to be better. I'm going to redo the grounds from body to engine and see if that helps. If she'll crank and run everyday for a couple of weeks, I might put a little faith in her and take a long drive.