Truck shuts off - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VDOG · 10-09-2007, 07:20 PM

I notice after I get on the freeway when I exit or finally come to a stop, my engine shuts off. It fires right back up and go's but it shuts off again at the next stop. When I drive on the street it does not happen as much.
I was told that this engine has a big cam and it was built for a manual tansmission truck. Not sure if that matters or not.

71tahoe · 10-09-2007, 07:29 PM

Do you have power brakes? The lack of engine vacuum may be contributing to stalling.

I've also seen some posts about loose wires in the distributor or fuel starvation so you may check those too.

VDOG · 10-09-2007, 07:36 PM

Quote:

Originally Posted by 71tahoe

Do you have power brakes? The lack of engine vacuum may be contributing to stalling.
I've also seen some posts about loose wires in the distributor or fuel starvation so you may check those too.

No power brakes. I've had this problem since I had this engine installed almiost 10 years ago. I was told it was the Q-jet first then my old distributor need replacing so I bought an HEI

68gmsee · 10-09-2007, 08:47 PM

[QUOTE=VDOG;2395822]I notice after I get on the freeway when I exit or finally come to a stop, my engine shuts off.QUOTE]

Does it die if you increase the idle speed adjustment also?

Most of the time when your engine dies when you come to a stop, it's an indication of fuel delivery (bad fuel pump), carburetor adjustment, idle control, or a vacuum leak.

Start with the easiest things first. In this case it would be idle control of some sort on the carburetor. Then look for vacuum leaks.

Check the carb gaskets, transmission vacuum modulator and hose, etc.

Check the fuel filters, fuel pump output and carb adjustment and vacuum hoses going to it.

Check the timing.

71tahoe · 10-09-2007, 08:56 PM

[QUOTE=68gmsee;2395943]

Quote:

Originally Posted by VDOG

I notice after I get on the freeway when I exit or finally come to a stop, my engine shuts off.QUOTE]

Does it die if you increase the idle speed adjustment also?

Most of the time when your engine dies when you come to a stop, it's an indication of fuel delivery (bad fuel pump), carburetor adjustment, idle control, or a vacuum leak.

Start with the easiest things first. In this case it would be idle control of some sort on the carburetor. Then look for vacuum leaks.

Check the carb gaskets, transmission vacuum modulator and hose, etc.

Check the fuel filters, fuel pump output and carb adjustment and vacuum hoses going to it.

Check the timing.

Definitely check timing! I just swapped a cab to another frame and didn't touch the engine. I found my distributor should have been spinning like the possessed girl's head in the exorcist if it wasn't for the plug wires.

VDOG · 10-10-2007, 12:39 PM

Quote:

Originally Posted by 68gmsee;2395943=

Does it die if you increase the idle speed adjustment also?
Most of the time when your engine dies when you come to a stop, it's an indication of fuel delivery (bad fuel pump), carburetor adjustment, idle control, or a vacuum leak.
Start with the easiest things first. In this case it would be idle control of some sort on the carburetor. Then look for vacuum leaks.
Check the carb gaskets, transmission vacuum modulator and hose, etc.
Check the fuel filters, fuel pump output and carb adjustment and vacuum hoses going to it.
Check the timing.

New fuel pum and filter as of last month. Carb just had the gaskets changed and been adjusted. Idle speed has been increased. Im thinking its vacuum related. Due to the fact that everything that has been suggested has been done. I will drive it today and see how it goes.

wibilly · 10-10-2007, 10:25 PM

is it a newer engine with an egr valve on the intake? it sounds like a sticking egr to me

VDOG · 10-11-2007, 12:06 PM

Quote:

Originally Posted by wibilly

is it a newer engine with an egr valve on the intake? it sounds like a sticking egr to me

No its a old engine,late 60's or early 70's.

10-09-2007, 07:20 PM	#1
VDOG Grand PooBaa Member Join Date: Jan 2001 Location: LA, CA Posts: 5,302	Truck shuts off I notice after I get on the freeway when I exit or finally come to a stop, my engine shuts off. It fires right back up and go's but it shuts off again at the next stop. When I drive on the street it does not happen as much. I was told that this engine has a big cam and it was built for a manual tansmission truck. Not sure if that matters or not.

10-09-2007, 07:29 PM	#2
71tahoe Registered User Join Date: May 2006 Location: Jonesboro, AR Posts: 916	Re: Truck shuts off Do you have power brakes? The lack of engine vacuum may be contributing to stalling. I've also seen some posts about loose wires in the distributor or fuel starvation so you may check those too.

10-09-2007, 08:47 PM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Truck shuts off [QUOTE=VDOG;2395822]I notice after I get on the freeway when I exit or finally come to a stop, my engine shuts off.QUOTE] Does it die if you increase the idle speed adjustment also? Most of the time when your engine dies when you come to a stop, it's an indication of fuel delivery (bad fuel pump), carburetor adjustment, idle control, or a vacuum leak. Start with the easiest things first. In this case it would be idle control of some sort on the carburetor. Then look for vacuum leaks. Check the carb gaskets, transmission vacuum modulator and hose, etc. Check the fuel filters, fuel pump output and carb adjustment and vacuum hoses going to it. Check the timing.

10-10-2007, 10:25 PM	#7
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Truck shuts off is it a newer engine with an egr valve on the intake? it sounds like a sticking egr to me __________________ common sense isn't so common anymore



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