2002 Silverado 4.8 Vortex stalls and runs rough - I need help I have ran the codes and getting 102 - Mass or Volume circuit low input, and 174 and ...

foamwizard · by **foamwizard** [OP] » Feb 06 2012, 10:24pm

I need help I have ran the codes and getting 102 - Mass or Volume circuit low input, and 174 and 171 system too lean (bank 1&2).

I have recently replaced the Mass Air Flow sensor, checked for vacuum leaks and replaced the fuel filter. The engine runs for a short time then stalls.

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ASTE25 · by **ASTE25** » Feb 07 2012, 2:29am

Have you checked all your fuses and made sure all the electrical connections are good?

foamwizard · by **foamwizard** [OP] » Feb 07 2012, 3:36pm

Yes, my suspicion is in the intake manifold gasket.

ASTE25 · by **ASTE25** » Feb 07 2012, 5:10pm

Have you tried spraying brake cleaner around it and see if the idle speed changes when you do?

foamwizard · by **foamwizard** [OP] » Feb 07 2012, 10:32pm

I tried that but not a big differences
.

ASTE25 · by **ASTE25** » Feb 08 2012, 1:32am

I may have missed it, but what engine do you have?

foamwizard · by **foamwizard** [OP] » Feb 08 2012, 3:07pm

4.8 I should also mention that when I start it now it will run only about a minute then shut off like its not getting enough fuel.

ASTE25 · by **ASTE25** » Feb 08 2012, 4:05pm

Possibly the idle control valve is bad.

foamwizard · by **foamwizard** [OP] » Feb 08 2012, 4:26pm

I understand why you would assume the idle control valve but with the code 171 and 174 ... running too lean, suggest that air is being sucked in.... possibly intake gasket which is a known problem with this engine especially over 100k miles.

ASTE25 · by **ASTE25** » Feb 08 2012, 7:28pm

Well, change the intake gasket. It's really easy on those engines. Should take no more than 2 hours. Hopefully the intake itself is not cracked, I think they are pretty expensive.

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2002 Silverado 4.8 Vortex stalls and runs rough - I need help I have ran the codes and getting 102 - Mass or Volume circuit low input, and 174 and ...

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