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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Unofficial on May 05, 2010, 06:10:03 pm
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Hey guys, I reset my ECM a week or two ago by disconnecting the battery so I could figure out why my engine light has been coming on. I just got back inside from checking for codes and here's what I got.
13- Oxygen Sensor Circuit
24- VSS Circuit-----------------I don't even have one of these! (Mechanical speedometer)
32- BARO Sensor Voltage Low---I'm assuming this is my MAP sensor
44- Lean Exhaust
So I'd say it's safe to say that it would be a good idea to buy a new O2 sensor! And maybe a new MAP sensor? I guess I just don't want to buy new ones if I don't need them...
But what about the VSS circuit code? I'm not sure what to gather from that. Thanks in advance for any help!
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Sounds like a vacuum leak to me and your vss is piggy backed off of your mechanical speedo
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Do you think the vacuum leak would be causing the code for just the MAP sensor or would that mess up my O2 sensor too by giving it a lean mixture? I can't find any vacuum leaks, but it sat for a while, so I'll have to do the WD-40 test again I guess.
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Well I tried hooking up a vacuum guage to see if it was around what it was supposed to be, but I wasn't getting a reading anywhere. I hooked up the hose from the guage to all of the nipples coming from the charcoal canister, but I didn't get anything. I hooked up the guage to the nipple coming from the throttle body that goes to the canister, still nothing. I'm assuming I'm doing something wrong... Any help? I've never done this before.
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Hook the gauge to a hose with Vacuum on it.
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If your going to replace the Ox2 get one with a heater, has three wires. You might spray some wd 40 around the lines and gaskets (engine idling) to find a leak.
Steve