Error Code 33 Info
Thread Starter
Instructor
Joined: Oct 2009
Posts: 202
Likes: 8
From: Tucson
Error Code 33 Info
I recently had a problem where my 85 Vette suddenly would barely run. I checked the error code, and it threw a code 33, MAF sensor voltage high. I bought a FSM from Ebay, and went through the diagram, and found something interesting.
After going through the diagram, and tearing part of the car apart to find the Burn Off module, I happened to notice on the wiring diagram in the FSM that there was a circuit going to the gauges. So I went to the fuse block and found a 10 amp fuse for the instrument panel, and it was blown. I replaced it and the car ran fine again. I had one of the instrument panel bulbs blow, so maybe they're related.
The whole point of this post? While the FSM has great info, it NEVER said to check the fuse! I spent a week and a half with my car down, and all I had to do was replace a fuse.
Long story short, on an error code 33, check the Instrument panel fuse first.
(and yes, I know, I will be monitoring the circuit to see why the fuse blew.)
After going through the diagram, and tearing part of the car apart to find the Burn Off module, I happened to notice on the wiring diagram in the FSM that there was a circuit going to the gauges. So I went to the fuse block and found a 10 amp fuse for the instrument panel, and it was blown. I replaced it and the car ran fine again. I had one of the instrument panel bulbs blow, so maybe they're related.
The whole point of this post? While the FSM has great info, it NEVER said to check the fuse! I spent a week and a half with my car down, and all I had to do was replace a fuse.
Long story short, on an error code 33, check the Instrument panel fuse first.
(and yes, I know, I will be monitoring the circuit to see why the fuse blew.)
Advanced
Joined: Feb 2012
Posts: 95
Likes: 1
From: Valparaiso Indiana
Did you end up finding out anything about this? I had the same problem with my 85. I replaced the fuse but it blew right away. I replaced it again and its holding up, but it needs to be warmed up to 170f before it will drive smoothly. If i try driving before that it has to be wide open or it dies.
Advanced
Joined: Feb 2012
Posts: 95
Likes: 1
From: Valparaiso Indiana
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The '85 has a MAF burnoff module (and I suppose it also supplies power to the MAF). Check your FSM to see how it's connected. I suspect it gets its power from the instrument panel fuse.
'85 was the only year to have this module, so I don't have any info on it.
'85 was the only year to have this module, so I don't have any info on it.
Advanced
Joined: Feb 2012
Posts: 95
Likes: 1
From: Valparaiso Indiana
Maybe its time for that ls1 swap. Haha.
