TotalyHucked
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- Feb 24, 2020
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- Location
- Auburn, Georgia
- First Name
- Zach
- Truck Year
- 1985
- Truck Model
- Sierra 1500
- Engine Size
- 5.3
^This
Spark plug gap closed fresh rebuild
- Thread starter Cdog_96
- Start date
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- Joined
- Sep 1, 2018
- Posts
- 1,036
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- 2,182
- Location
- Washington State
- First Name
- Craig
- Truck Year
- 1973 (have two), 1985
- Truck Model
- K10, K20, C20
- Engine Size
- 350, 454, 6.2 Detroit
I have been the recipient of much good humored help on this forum, but as a machinist, and Like Ricko says "just because it's old, doesn't mean it's bad, and just because it's new, doesn't mean its good. I knew nothing when I started, now I know that, after 60 years of wrenching, 40+ years machining, there is lots to learn. Personally if that was my engine, it would be coming apart. If something has hit the piston, I would not want to find out when a hole has developed and you are oil blowing everywhere. Happened once to me.
mlparkey
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- Oak Lawn
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- Mark
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- 1986
- Truck Model
- C10
- Engine Size
- 5.7
A spark timing issue is not going to cause that. That's impact damage. The only thing that's going to impact a sparkplug electrode is the piston or something floating around in the cylinder. If you didn't drop that sparkplug before installation then there's a mechanical issue with that cylinder.
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- 45
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- St Louis
- First Name
- Jim
- Truck Year
- 1985
- Truck Model
- C15
- Engine Size
- 350
Don't know exactly - but north of 175 psi. Take out all plugs. Crank on each cylinder with the tester installed, let it pulse 4 times. you should not see a variation of more than 10% hole to hole.
nvrenuf
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- 1991
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- K5
- Engine Size
- 454
@Cdog_96 any updates?
Rusty Nail
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Meh
Cdog_96
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- Aiken
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- Clay
- Truck Year
- 1983
- Truck Model
- K10
- Engine Size
- 454
Sorry have been busy, I checked the cylinder and looked good with bore scope. The timing was way too far advanced, the tbi computer was putting it way out of spec. I got the timing right and all is good, plug looks good and no misfires
nvrenuf
Full Access Member
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- 1991
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- 454
@Cdog_96 Glad it's running good now.
Just to say it, while setting the timing are you disconnecting the wire by the harness bulkhead connector down below the wiper motor / master cylinder? (I think it's tan /white stripe)
Just to say it, while setting the timing are you disconnecting the wire by the harness bulkhead connector down below the wiper motor / master cylinder? (I think it's tan /white stripe)
BillK
Member
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- Feb 11, 2021
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- Waldorf Md
- First Name
- Bill
- Truck Year
- 1985
- Truck Model
- Blazer
- Engine Size
- 350
