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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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My 2007 Silverado 5.3 tach doesn't work and its hard to

Customer Question

my 2007 Silverado 5.3 tach doesn't work and its hard to start
Submitted: 9 months ago.
Category: Chevy
Expert:  Jared D replied 9 months ago.

I'm hesitant to say that the tach not working and the long crank are related, but it's possible. Lets start with the long crank:

Is it more prominent after filling the gas tank?

If you remove the gas cap before trying to start it does it go away?

If you cycle they key (turn to run for 5 seconds then off then run for 5 seconds then off, then start) does it start right away?

Customer: replied 9 months ago.
no none of these make any difference
Expert:  Jared D replied 9 months ago.

Ok.

Does it get any better based on temperature outside?

How old is the fuel pump?

Expert:  Jared D replied 9 months ago.

No trouble codes stored right?

Customer: replied 9 months ago.
I think it was something with crank circuit
Expert:  Jared D replied 9 months ago.

How old is the fuel pump?

Customer: replied 9 months ago.
Factory pump with about 100 k on it but shows good pressurr
Expert:  Jared D replied 9 months ago.

What kind of pressure readings are you getting?

Customer: replied 9 months ago.
58
Expert:  Jared D replied 9 months ago.

Check for the fuel pressure to bleed off too quickly. It should bleed off less than 5 PSI in 1 minute once the fuel pump is shut off.

Customer: replied 9 months ago.
Yea fuel pressure hardly bleeds off at all forgot to mention has a stabilitrac message also when tach quit
Expert:  Jared D replied 9 months ago.

I can't find anything in the wiring schematic that would make it long crank and also kill the tach.

If you'd like I'll opt out and see if anyone else has any insights.

Customer: replied 9 months ago.
I thank you but but don't under stand why all started at once and I don't want to use your service and not pay you but thanks anyway.
Expert:  Jared D replied 9 months ago.

The only two things I have ever seen cause a long crank are low or bleeding fuel pressure and a bad EVAP solenoid.

Expert:  Jared D replied 9 months ago.

Can you monitor fuel trims with your scan tool?