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#1 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Engine noise after deiseling event! Help!
I recently had a deiseling event on my 68 c10 250 engine. Never happened before. I use premium gas all the time and timing set at 8* BTC. Anyway, after I started it up and drove on home but notice a slight ticking noise. I don't remember this noise before. Couldn't pin point the tick with a stethoscope or by ear.
What could it be? Any ideas? Looking for advise how to check for damage OR what could have been damaged. Hopefully it's a lifter or rocker or just my imagination running wild.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#2 |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Engine noise after deiseling event! Help!
I'd say your timing is out, or if your engine is a stock build you are burning Ppremium gas for nothing, both can cause detonation. was the tick on acceleration? Dieseling is also an indicator of a timing issue.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#3 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
Never deiseled before at the current timing setting and fuel. Premium should suppress knock but the tick increases as RPMs increase. I've only noticed it idling in the shop. Opened the hood and increased RPMs while in neutral and tick increases also. Have not driven it since I noticed it yesterday.
A mechanic I trust indicated that it could be carbon build up in the cylinder and a piece broke free and stuck to the top of the piston making the noise when on compression stoke. He also said it could have damaged a lifter and colapsed or a cracked rocker. Just wondering if anyone one else had the same issues and what was the problem. Thanks
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#4 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
It's a stock built 250 engine. Never been rebuilt with 22k original miles
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#5 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Engine noise after deiseling event! Help!
Stock I6 should not need Premium fuel. If you must run a high octane, you can even cut back to 89.
Another thing to look at is exhaust leaks. Many a small "tick-tick-tick" that increases with RPM turns out to be an exhaust leak. Could be at the donut seal. Gary EDIT: I thought I was seeing double... I was in the engine and drivetrain section and saw this post and couldn't figure out where my response was. ![]()
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
Last edited by GASoline71; 03-03-2015 at 08:45 PM. |
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#6 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
Thanks for the info. I'll check the exhaust for leaks too. Didn't think of that possibility.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#7 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
UPDATE:
I pulled all the plugs, appears to be running on the lean side. I then fired it up and checked for exhaust leaks and didn't find any. Then I was finally able to narrow the ticking noise down to the mechanical fuel pump. Shut it down and it deiseled again. Decided the check the timing and found that it had move to 4* ATDC, I had set it at 8* BTDC when I did the HEI upgrade a few weeks back. Checked the dizzy hold down bolt and found it barely snug. Loosened it up adjusted timing back to 8* BTDC without VA hooked up. Adjusted the idle speed then the idle A/F mixture. Shut it down. No more deiseling. Drove it for about 20 miles, still no deiseling and fuel pump noise is a little quieter. Thanks everyone for the advise.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#8 |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Re: Engine noise after deiseling event! Help!
Very few things cause dieseling. One of them is not ignition timing. Think about it, dieseling occurs with the ignition turned off. That is, unless one is considering the temperature of the spark plug if the timing is too advanced. I suppose then it's conceivable timing can contribute, if the plug is hotter than normal.
I have recent experience with my truck dieseling, I'll share for further reference. Driver's side donut had been leaking for some time. Truck is driven infrequently, so it hadn't been an issue. I ended up finally doing the repair, and found the idle to be rough afterwards. In a pinch I upped the idle speed to compensate. Know what happened? It started dieseling! Warmed it up, adjusted the fuel mixture, set the idle. Now it idles great, doesn't diesel. Exhaust leak is gone, sounds wonderful! In my experience, dieseling is caused by incorrect fuel mixture and/or high idle speed. (I am curious, if the high idle speed directly causes dieseling, or if it has more to do with the alternator back-feeding the ignition?) As an aside, my old VW Beetle has a idle stop solenoid in the carburetor to prevent dieseling and wasted fuel from being sucked into the intake between the time the ignition is shut off and the engine stops rotating.
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I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba. |
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#9 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
I agree with you. May be the timing and plugs might have been the issue. After I set the timing and cleaned the plugs. I also decarboned the engine using the water trickle trick then lowered the idle down and adjusted the A/F ratio.
Been driving it as my DD all week. Never has had another dieseling issue again. Don't really know which one corrected it, guess the fuel carb adjustments made it go away. Engine runs so quite now you have to open the hood to see if it's running if your in a spot where you can't hear the exhaust note. Got a quite muffler on it.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#10 |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Ooo, quiet muffler eh? What kind do you have? Unlike perhaps 95% of truck owners out there, I prefer quiet!
I've got a set of Turbo mufflers from the PO, not a fan of them, but being broke is my motivation for keeping them! --Mike
__________________
I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba. |
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#11 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
I got the biggest diameter and length round shape muffler the shop had. I asked for the quietest one they had and they said round ones with the longest length and diameter makes them quiter. It's just a no name brand stock style muffler. Not a turbo or anything. I'll be under the truck tomorrow and see if they got a name on it, don't remember one being stamped but may be I over looked it. Think I paid $40 installed.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#12 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Engine noise after deiseling event! Help!
Glad you got the dieseling under control. Kind of a bummer that you don't know which resolved it. But don't look a gift horse.....
I did the quietest on mine too.... Went to the shop I always go to. Asked the guy for the quietest 2.5" inlet and outlet. Run then from the headers and dump them right before the rear end. They are quiet in the truck. Outside I am told they are noisy but I don't hear it that much. They are ovals tucked up tight.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#13 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Engine noise after deiseling event! Help!
Well this old I6 is a quite motor to begin with. Now the 462 bob in the 70 is another story. Couldn't make it quite unless you turn the key off. Lol.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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