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11-22-2005, 08:41 AM
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#1 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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dieseling?
what causes it....and whats the best way to fix it.....I am sitting at a 50/50 rate here.....half of the time its fine, and half of the time it runs for 10 secs. after I shut the engine off.....sometimes it sputters a couple of times, revs real high, then dies.....any ideas?
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's  1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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11-22-2005, 08:44 AM
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#2 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,233
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Re: dieseling?
timeing out?
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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11-22-2005, 08:46 AM
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#3 |
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Senior Member
 Join Date: Jul 2005
Location: MISSOURI
Posts: 3,256
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Re: dieseling?
Set the idle down a bit. When they idle too fast they will do this. Noticed this more with stock engines. Camed up some not so likely to act as such.
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11-22-2005, 08:50 AM
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#4 |
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Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: dieseling?
mine was from the return spring not pulling the throttle closed everytime.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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11-22-2005, 11:27 AM
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#5 |
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Registered User
Join Date: Dec 1999
Location: san diego, ca
Posts: 546
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Re: dieseling?
The most common reason I see is the throttle plate is too far open at idle. Try re-tuning the carb. It maybe a little rich at idle which requires the throttle plate to be open more than it should be in order to run. Check the timing before you re-tune. I also had a problem with my high-idle not kicking down all the way. This can cause the same problem.
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'70 K-20 San Diego, CA |
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11-22-2005, 12:00 PM
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#6 |
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Jamie Hyneman is my twin
 
Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: dieseling?
I had a catch in my throttle linkage that made it seem like it was closed, but really wasn't. Solved this, and re-set my timing. Everything was better.
Running-on is usually caused by a hot spot developed in one or more cylinders that continues to ingite fuel after you've turned off the ingition. If there is fuel and air still available the engine will run-on. By closing the carb all the way you eliminate the air from the equation. Poor timing can cause a hot spot to develop. Rochester used to have a soliniod that held the throttle open when driving, but let it close all the way when the car was off. I've seen them for holleys too. Untill you get it fixed, you can turn off the engine while it is in drive, then shift to park after. more later Justin |
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11-22-2005, 12:13 PM
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#7 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: dieseling?
its a stick shift, so that probably won't work all that well.
Can anyone tell me what the correct timing for a stock 250 is?
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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11-22-2005, 08:01 PM
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#8 |
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Registered User
Join Date: Dec 2004
Location: Saskatchewan, Canada
Posts: 1,371
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Re: dieseling?
I advanced the timing and set the idle down a bit on mine. It runs better now and no dieseling. Its a 350 with a Q-jet.
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1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open |
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11-23-2005, 02:10 PM
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#9 |
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Semi-Senior Member
Join Date: Feb 2003
Location: Washington, MO
Posts: 390
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Re: dieseling?
The 6 cyls had a idle stop solenoid. It will extend whenever the key is on. It has to work and be adjusted right to stop the dieseling. There is a allen screw in the top of it. If I remember right, you screw the entire solenoid to set the engine idling speed, Then disconnect the wire to it and adjust the solenoid off speed with the allen head. If the specs aren't on the fender (yeah, right) let me know and I will find them.
HTH Steve
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'68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab |
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11-23-2005, 02:11 PM
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#10 |
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A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Re: dieseling?
What he said. Lower your idle, allowing the throttle plates to fully close when you shut off the engine. Bump up the timing a little to regain your idle quality. If that doesn't do it, check for vaccum leaks; its gotta be getting air somewhere...
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-Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy |
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