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#1 |
Don't say "Oops!", Doctor
Join Date: Nov 2003
Location: Houston, TX
Posts: 677
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<gulp> I hadn't thought of that possibility!
Those of you that followed this thread are aware that my 68 is currently down waiting on parts. Anyway, I was talking to my old man this evening and we ran through the symptoms again. He reminded me of a rather nasty possibility... a hole in a piston!
I'm keeping my fingers crossed, but only a compression test will tell for sure. In the mean time, I'm hunting down an HEI unit and a swap-on carb to eliminate those possibilities. Oh, man... that'd be just my luck! ![]() But, that wouldn't explain A) the fact that it threw a very similar fit about a month ago then cleared itself out and B) the off-idle hesitation, would it? That's more like what a pissy carb would do, yeah? Jeez... I hope so!
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'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list |
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#2 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Didn't you say you have a cold knock?
It could be the problem....fairl unlikley. SBC's (especially 327's) are usually very tough motors...the piston shouldn't break unless the engine was revved overly high...... I think your problems will proably be solved by an HEI, good carb, and a tuneup ![]()
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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#3 |
Don't say "Oops!", Doctor
Join Date: Nov 2003
Location: Houston, TX
Posts: 677
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Cold knock (2-3 seconds on start-up), low power, poor gas mileage, low oil pressure at idle... it's all consistent, but (as far as I know) the engine hasn't been stressed that hard. I think I'm worrying too much. My wife laughs at me. While the truck is down, I'm "forced" to drive my BMW.
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'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list |
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#4 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,922
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I think you'd notice a lot of blow-by with a hole in the piston. You'd probably have smoke and oil coming out of the motor everywhere.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#5 |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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Cold Knock,Lo Oil press.
I am concerned more than others about your problem!!! Low oil pressure and cold knock could very possibly be a Main Bearing problem.
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#6 |
Registered User
Join Date: Mar 2003
Location: Stillwater MN
Posts: 1,166
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The knocking, and low oil pressure are either a main, or rod bearing, OR, maybe a cam bearing...the ticking and missing and backfiring thru carb, are flat cam lobe symptoms. I suggest pulling the valve covers, and looking for a very loose rocker arm.
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69 GMC K10 ..some restoration required....still.. ![]() |
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#7 |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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i AM INCLINED TO AGREE WITH cLASS OF 69..IT SOUNDS LIKE MORE THAN A CARB OR TUNE-UP PROBLEM.
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#8 |
Don't say "Oops!", Doctor
Join Date: Nov 2003
Location: Houston, TX
Posts: 677
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Okay, maybe you guys don't understand the concept of making me feel better about this little problem!
![]() What I want to hear is, "Oh, you forgot to change the <insert cheap part here>!" or "Ha! Just turn the <stupid little bolt> one-quarter of a turn!" Oh, who am I kidding? I can see the writing on the wall and it spells R-E-B-U-I-L-D! ![]()
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'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list |
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#9 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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actually you do not have to run a motor hard to put a hole in a piston running it lean will do the same thing. will burn a hole in a piston before you knew what happened
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#10 | |
Registered User
Join Date: Mar 2003
Location: Stillwater MN
Posts: 1,166
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Quote:
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69 GMC K10 ..some restoration required....still.. ![]() |
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