Codes 27 and 48
Thread Starter
Race Director
Joined: Jun 2000
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From: Oakland CA
St. Jude Donor '03
Codes 27 and 48
I took my 94 LT1 into the shop the other week because it's time for the bi-annual smog inspection and the check engine light is coming on. Well, they did practically nothing the whole week they had the car with them so I picked it up this past Saturday. They did leave some printed pages regarding codes 27 and 48 though. I'm assuming that they at least scanned for codes and this is what they came up with. They had also told me over the phone that the NOX was a bit high. From what I've found Code 27 is for the EGR SOL Valve and Code 48 is for the Mass Airflow Sensor. Should I just replace the Mass Airflow Sensor and EGR Valve or is there a cheaper way to solve this problem?
Thanks!
*I crossposted from Scan and Tune because this place gets more traffic.
Thanks!
*I crossposted from Scan and Tune because this place gets more traffic.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by El Guapo
From what I've found Code 27 is for the EGR SOL Valve and Code 48 is for the Mass Airflow Sensor. Should I just replace the Mass Airflow Sensor and EGR Valve or is there a cheaper way to solve this problem?
RACE ON!!!
Thread Starter
Race Director
Joined: Jun 2000
Posts: 13,128
Likes: 0
From: Oakland CA
St. Jude Donor '03
Originally Posted by CFI-EFI
Don't shoot the messenger! A code gets set when a reading comes into the ECM (or whatever, in the later cars) that is out of the expected parameters for the conditions, at the time. sensors sense. That is their job. An out of parameter reading in a certain sensor circuit, doesn't necessarily mean that the device is bad, The condition that triggered the SES light may have actually occurred. The sensor doesn't HAVE to be bad. Replacing the EGR SOL and the MAF are just throwing money at the problem with no confirmation the the parts being replaced are bad. Your FSM has trouble shooting charts for each of the codes. This allows you to systematically and methodically, check for the fault(s), test the components in question, and only replace defective parts. THAT is the "cheaper way to solve this problem".
RACE ON!!!
RACE ON!!!
