![]() |
![]() |
#1 |
Registered User
Join Date: Nov 2002
Location: Middletown ohio
Posts: 1,058
|
![]()
almost everytime i turn the truck off it diesels I have adjusted the carb and still does it. when it was cold out side it did not do it but now that it is summer it does it all the time.
specs 350 bored 30 over rv cam 1405 carb (manual choke) timming set at 8 deg btdc running 89 gas any thing you all can think of ?? also every now and then get a backfire up the carb. other than that it starts and runs good thanks in advance Darren
__________________
The very atmosphere of firearms everywhere restrains evil interference. When firearms go, all goes, we need them every hour. - George Washington No free man shall be debarred the use of arms - Thomas Jefferson Later Darren ![]() http://www.myspace.com/dmurphy68 Last edited by dmurphy68; 07-21-2003 at 06:01 AM. |
![]() |
![]() |
![]() |
#2 |
Registered User
![]() Join Date: Oct 2001
Location: Southern New Mexico
Posts: 649
|
Check the timing. I know you said you have it set at 8 deg but try a few different spots . Also make sure the idle is not to high.
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Nov 2002
Location: Middletown ohio
Posts: 1,058
|
idle is set at 900 and 600 in gear but I dont get it, it ran fine in the winter and colder months
__________________
The very atmosphere of firearms everywhere restrains evil interference. When firearms go, all goes, we need them every hour. - George Washington No free man shall be debarred the use of arms - Thomas Jefferson Later Darren ![]() http://www.myspace.com/dmurphy68 |
![]() |
![]() |
![]() |
#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Try running the 91 or what ever octain, see what it does.
The wife had an 84 K-car that would do this every time you shut it off, even if you left it in drive it would do it. An old man told me to try hi-test and bigger than shiznit, it worked. Leaving it in gear when shutting it off should help, as does turning the steering wheel and depressing the service brake at the same time as shutting it off. (asuming you have both power steering and brakes) How long has it been since the heads were off? If there is a possability of carbon deposits on the pison or combustion chaimber, you can SLOWLY pour a little dextron down the primarys with the engine running at 1500 RPM, a squirt bottle of watter injected the same way works too. (old school tricks to help pass emissions tests)Running a little lean can also cause this. Lean = hot spots, and all it needs is one point to be hot enough to ignite the unburned incoming charge as you kill the ignition. Backing off the timing helps, but I doubt that is your problem here. What does it idle at? An excesively high idle speed can also do this, but again, I doubt this is the issue either. |
![]() |
![]() |
![]() |
#5 |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
|
Start using 90+ octane and it will go away.
How many miles are on this engine? |
![]() |
![]() |
![]() |
#6 |
67-72 truck surgeon
Join Date: Jul 2003
Location: Indiana
Posts: 155
|
It's probably the timing. try advancing it some more. My 400 small block is set well above 8 and it runs good. Also check to see if you plug wires are in proper sequence. good luck!
__________________
1969 Chevy C10 1993 Toyota Camry LE 1999 Ford F250 Super Duty 4x4 diesel 2008 Dodge Charger Super Bee 1953 International R182 |
![]() |
![]() |
![]() |
#7 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
|
i think his issue is heat the fuel is still combusting without spark. i agree try a higher octane in the summer months and see what happens
__________________
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. |
![]() |
![]() |
![]() |
#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
advancing the timing would more likely than not make matters worse. With more timing comes more heat, and heat is the main thing that causes dieseling.
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Nov 2002
Location: Middletown ohio
Posts: 1,058
|
it only has 2500 miles just rebuilt in winter I am running 89 in it but will try a tank of high test donty want to but got to pay the $$
__________________
The very atmosphere of firearms everywhere restrains evil interference. When firearms go, all goes, we need them every hour. - George Washington No free man shall be debarred the use of arms - Thomas Jefferson Later Darren ![]() http://www.myspace.com/dmurphy68 Last edited by dmurphy68; 07-21-2003 at 09:02 PM. |
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Mar 2003
Location: Columbus Ohio
Posts: 1,413
|
Try a combustion chamber cleaner (or one of longhorn's tricks), or richen the mixture a hair. If that doesn't work, then try a colder plug.
|
![]() |
![]() |
![]() |
Bookmarks |
|
|