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cloe0626
cloe0626, Auto Mechanic
Category: Chevy
Satisfied Customers: 811
Experience:  was a mechanic in the army for four years and have been working at a dealer ship the past five years
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Truck lost power going down the road and stalled. Will crank

Customer Question

Truck lost power going down the road and stalled. Will crank over but will not run. Fuel rail pressure at 58 psi, and over 70psi while cranking. Have rpm reading of 145 while cranking but will not start. replaced fuel pump already same condition, I have dropped the gas tank and can get to the FPCM. Need some advice.
Submitted: 1 year ago.
Category: Chevy
Expert:  cloe0626 replied 1 year ago.

are you getting a check engine light if so have you found out what codes it is giving

Customer: replied 1 year ago.
I had two previous check engine lights while the truck was still running and never resolved them but like I said it was still running.
Customer: replied 1 year ago.
Give me about 10 min I can pull them for you.
Please hold
Expert:  cloe0626 replied 1 year ago.

not a problem

Customer: replied 1 year ago.
Ok 2 previously existing codes p0011, p0430
New codes p023f, p0452, p1682
Expert:  cloe0626 replied 1 year ago.

the new codes are for a faulty fuel control module

Expert:  cloe0626 replied 1 year ago.

that was the p023f p0452 is and emission code the p 1682 is low ignition switch voltage but morre then likely is caused by the fuel control module

Customer: replied 1 year ago.
How should I go about testing this module
Customer: replied 1 year ago.
I see it just above the frame and have access to it
Expert:  cloe0626 replied 1 year ago.

With the key in the off position, disconnect the Fuel Pump Flow Control Module and connect a test light to the Dk Green/White wire at pin 13. Then you turn the key on, engine off.it should light up that will let you know if you are getting power to it if you need anything else let me know and please be sure to rate my service when you get the chance

Customer: replied 1 year ago.
can you stick around while I do some tests and go thru the results with me?/
Expert:  cloe0626 replied 1 year ago.

yeah im going to be on for a little while longer

Expert:  cloe0626 replied 1 year ago.

any luck

Customer: replied 1 year ago.
plugging in now, had to eat something was about to pass the f out
Expert:  cloe0626 replied 1 year ago.

ok just let me know

Customer: replied 1 year ago.
we got 11 volts on the green/white wire on position and while cranking
Expert:  cloe0626 replied 1 year ago.

its getting voltage atleast but according to code it is failing so i would say the unit is just bad

Customer: replied 1 year ago.
what is the gray wire coming out of the module in terminal d
Expert:  cloe0626 replied 1 year ago.

honestly im not for sure i dont have a diagram for it im at home not at work

Customer: replied 1 year ago.
ok, I bypass the module and the pump is running continuously but the truck still crank and will not run. what is it about this module that will not allow the truck to start even tho the pump is running?
Expert:  cloe0626 replied 1 year ago.

it regulates how much pressure to send to the injectors your fuel pressure should be around 44 psi

Expert:  cloe0626 replied 1 year ago.

at the fuel rail shouldnt drop lower

Customer: replied 1 year ago.
the fuel rail pressure is at 58psi and peaks at about 70 while cranking but still not running
Expert:  cloe0626 replied 1 year ago.

then your module and fuel pump is fine you need to test your injectors Using a Multimeter to Test Fuel InjectorResistance Ohms. Learn how to check fuel injectors to make sure they are working. You use a multimeter on the resistance settings and measure the ohms of the injector. All injectorsshould be within .5 ohms of each other