MAS Relay?
Thread Starter
6th Gear
Joined: Apr 2004
Posts: 6
Likes: 0
From: San Francisco CA
MAF Relay?
Guys, thanks for the help with the stuttering problem my '87 was having - I replaced the Mass Air Flow sensor and the ECM and it seems to run fine now. The problem I'm having is that my check engine light will come on after running for a while. It is throwing a Code 33, and given that I replaced the MAF and ECM, I'm thinking that the problem is a relay of some sort between the MAF and the ECM.
Does anyone know what this relay is called, where it is, how I can swap it out, and where might be the best place to buy a new one? Thanks.
Note: I swapped out the MAF for a Granatelli MAF and I can't figure out how to adjust this MAF, but I don't think that is giving me my current problem.
[Modified by Niner Fan, 7:06 PM 5/4/2004]
[Modified by Niner Fan, 7:07 PM 5/4/2004]
Does anyone know what this relay is called, where it is, how I can swap it out, and where might be the best place to buy a new one? Thanks.
Note: I swapped out the MAF for a Granatelli MAF and I can't figure out how to adjust this MAF, but I don't think that is giving me my current problem.
[Modified by Niner Fan, 7:06 PM 5/4/2004]
[Modified by Niner Fan, 7:07 PM 5/4/2004]
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: MAF Relay? (Niner Fan)
I know what the problem is. You put in a high flow MAF and the measured airflow at a given rpm is higher than stock so the computer sets the code 33. The only way to change this is to up the threshold in the prom or go back to your stock MAF. You also need to increase the airflow limits in the 'airflow vs rpm' table to have the computer use the reported airflow.
Team Owner
Joined: Sep 2001
Posts: 62,128
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: MAF Relay? (Niner Fan)
The MAF relays are behind the battery on the firewall.
But as suggested, this could still be a Granatelli MAF problem.
But as suggested, this could still be a Granatelli MAF problem.
