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Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 15900
Experience:  GCM master tech over 25 years
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It will crank up and run for like 2 minutes then it starts

Customer Question

It will crank up and run for like 2 minutes then it starts misses n dies but I can start right back up, if I hold my foot on the gas it will run without dieing but as soon as I let my foot off it will die
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: It will start up almost every time until wen I try n start it, it will feel like it wants to start but dont
JA: What is the model/year of your GMC?
Customer: 2001 GMC sierra c3 6.0l
JA: Are you fixing your Sierra yourself? What have you tried so far?
Customer: Yes I am, it has good fuel pressure and the spark look alright
JA: Anything else you want the mechanic to know before I connect you?
Customer: I thought maybe the catalac converter was clogged mayb
Submitted: 11 days ago.
Category: GMC
Expert:  Gary replied 11 days ago.

Welcome! My name is ***** ***** I will do my best to assist you with this problem.

Expert:  Gary replied 11 days ago.

are there any codes set at all in the computer ?

Customer: replied 11 days ago.
Expert:  Gary replied 11 days ago.

if you remove the 02 sensors out of both exhaust manifolds before the cat converters will it stop stalling at idle ?

Customer: replied 11 days ago.
It still stalls after I took the o2 sensors out
Expert:  Gary replied 11 days ago.

if you run it then shut it off and unplug the vacuum hose at the fuel pressure regulator does fuel drip out of the regulator ?

Customer: replied 11 days ago.
It won't start now it just spins over
Customer: replied 11 days ago.
But b4 all this happened sometimes it would start up on the first try n most of the time u would have to turn the key again to start up
Expert:  Gary replied 11 days ago.

what is the fuel pressure reading key ON engine OFF and will it hold or drop to 0 fast ?

Customer: replied 11 days ago.
I don't have a pressure gauge I just know wen I turn the key on fuel comes out the valve wen I push the pin in
Expert:  Gary replied 11 days ago.

we need to see what the pressure is key ON engine OFF

with it not running now will it somewhat run on starting fluid or carb cleaner being sprayed down the throttle body ?

Customer: replied 9 days ago.
How much pressure does the fuel have to hold
Expert:  Gary replied 9 days ago.

55 ish

Customer: replied 9 days ago.
I sprayed starter fluid in the throttle bottle n it started up n ran for a couple of seconds n killed so I know the fuel pump is the problem
Expert:  Gary replied 9 days ago.

either the fuel pump is bad or the injection is not sending in fuel

what is the fuel pressure key ON engine OFF ?

Customer: replied 9 days ago.
No fuel was coming out the line the battery died so I charged it n put it back in and I wasn't getting no fuel out the line I even took the line off by the little filter n still no fuel, I changed the relay thinking that was the problem but it wasnt
Expert:  Gary replied 8 days ago.

when cranking it over does the grey wire show 12 volts when cranking it over ?

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