HAD CODES P0171 AND P0174

2001 Chevrolet Suburban

Tiny

thomasstuckey

October, 2, 2012 AT 5:58 PM

I also had codes p0171 and p0174 so I looked at the intake gaskets and replaced them, also a few vacuum line elbows that I found cracked that went from the fuel pressure regulator to the air intake. And those codes have not come back.

FOUND 141 RELATED QUESTIONS

18 Answers

Tiny

ASEMaster6371

October, 2, 2012 AT 6:20 PM

102 is a mass air flow code. The 400 series are evap codes.

How does it run?

Are all connections good at the mass air flow? Is the big hose to the air filter tight and secure?

Roy

Tiny

thomasstuckey

October, 2, 2012 AT 6:34 PM

With the MAF connected it would start fine then about 10 to 15 seconds the RPM's would decrease and it sounded like it was ready to stall but really just run rough. The air filter intake hose is secure the connection look good, i've got good PWR in 14VDC and a solid ground, from the signal side with the truck running I get about 5.04VDC. I didn't get the 400 series codes until I changed the MAF. When I disconnect the MAF it runs perfect with no issues.

Tiny

ASEMaster6371

October, 2, 2012 AT 6:38 PM

Most likely the sensor is bad.

Roy

Tiny

thomasstuckey

October, 2, 2012 AT 7:13 PM

So you think that the new sensor I put was just bad?

Tiny

ASEMaster6371

October, 2, 2012 AT 7:29 PM

Possible. Why did you replace it

Roy

Tiny

thomasstuckey

October, 2, 2012 AT 7:51 PM

Because I got the 102 code after replacing the intake gaskets for codes 171 and 174.

Tiny

ASEMaster6371

October, 2, 2012 AT 8:41 PM

Did you try the old mass air flow? Since you replaced the gaskets, the sensor may not have been bad, just unable to overcome the vacuum leak

Roy

Tiny

thomasstuckey

October, 2, 2012 AT 9:09 PM

I changed the MAF after taking care of the other elbows and gasket

Tiny

ASEMaster6371

October, 3, 2012 AT 12:16 AM

Ok, did you put the old one back on?

Roy

Tiny

thomasstuckey

October, 3, 2012 AT 12:20 AM

Nope I did a one for one so no $65 core charge

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