Something is not right.
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New User
Joined: Mar 2010
Posts: 1
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Something is not right.
I have a 1985 f150 with a straight six. Recently I had the carburetor replaced.
It runs great, but when I turn the truck off it either chugs for a little while and then cuts off or it backfires.
Any advice would be appreciated.
It runs great, but when I turn the truck off it either chugs for a little while and then cuts off or it backfires.
Any advice would be appreciated.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Dieseling, aka run-on. I've caused this by mis-adjusting the idle mixture on the carb
combined with mis-adjusted timing, both while trying to pass emissions tests. Some
engines have a solenoid that 100% closes the throttle plate when the engine is shut off,
thereby forcefully avoiding this problem.
combined with mis-adjusted timing, both while trying to pass emissions tests. Some
engines have a solenoid that 100% closes the throttle plate when the engine is shut off,
thereby forcefully avoiding this problem.
Senior User
Joined: Oct 2003
Posts: 232
Likes: 1
From: LINCOLN, IL
idling too fast
back off the idle screww
before you damage a rod bearing or piston pin in it..
if its not already happened...
putting a electric solenoid on it would be great, they were meant ot step up the idle speed when a/c was on, but you can use them to hold the idle speed when key is on, and then let the throttle shut completely when you shut if off
GM has these also and i used them all the time on my old chevies
works great to kill the engine quickly when you shut it off..
fast idle solenoid is the technical name of it
good luck
back off the idle screww
before you damage a rod bearing or piston pin in it..
if its not already happened...
putting a electric solenoid on it would be great, they were meant ot step up the idle speed when a/c was on, but you can use them to hold the idle speed when key is on, and then let the throttle shut completely when you shut if off
GM has these also and i used them all the time on my old chevies
works great to kill the engine quickly when you shut it off..
fast idle solenoid is the technical name of it
good luck
Junior User
Joined: Sep 2009
Posts: 96
Likes: 0
From: Laramie Wyoming
X2 on the timing. You may also have some gunk built up inside the cylinders which is getting hot enough to keep igniting the fuel for a short time. You may want to try something like seafoam to try and knock some of that gunk out.
