blew with my mouth, zero resistance
it just flashes 12 12 12 12 12 12 12 12 12 12 12 12
so what is that? is that code 12 or just it saying there are no codes? or that obd1 port is a crappy way to diagnose issues?
91 GMC 2500 died, fuel in the feed line, not getting to injectors
- Thread starter Jwill000
- Start date
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it just flashes 12 12 12 12 12 12 12 12 12 12 12 12
so what is that? is that code 12 or just it saying there are no codes? or that obd1 port is a crappy way to diagnose issues?
12 means "No Distributor Reference". When you see that, you know your ECM/PCM is working and communicating through the ALDL
"12" is a code. As said, it's the code for "No distributor reference", which would be totally normal since the engine isn't running, therefore the distributor isn't moving, and therefore there's no signal being generated. It's how GM allows you to know that the system is working. The OBD1 port is a WONDERFUL way to diagnose issues related to the computer, sensors, and general engine running/driveability--IF (big IF) you have the proper tools to make use of the OBD1 connector. A paper-clip is NOT a proper tool. The amount of info available through a paper-clip or code-reader is not even 1/10 of what's available with a more sophisticated tool.
Stop looking at "codes" (which can be useful, but not this time) and start looking at the data stream...what does the computer say is the engine RPM during cranking? You need a SCAN TOOL, not a crappy "code reader" or paper-clip.
like I said, it has never worked. I tried two different obd1 adapters and both had communications failure or something. I've even taken it to shops(not the dealer) and they couldn't read it either. I've always just thrown parts at it and usually figured it out on my own - which is what it looks like I'm going to have to do now
I don't understand how you can get codes, but not data stream. Is your tool capable of reading the data stream? Do you have broken wires leading to the OBD1 connector?
the fuel computer wasn't getting full 12v, so I jumped that, then it would run and immediately die. I put on the $50 adapter for fuel pressure and the fuel pump wasn't getting 12v. When I jumpered that and got proper pressure, the injectors stopped firing. I got tired of having a lawn ornament and wanted a truck back.
cheap fuel pump, reman 4barrel 650 carb, adapter plate, and it ran first turn of the key(using the stock ignition that still worked)
now I have a truck that works, and I was planning on swapping to a carb if/when I did a cam and headers. I think this truck just has too many fusable links and the wiring has some issues causing voltage drops
cheap fuel pump, reman 4barrel 650 carb, adapter plate, and it ran first turn of the key(using the stock ignition that still worked)
now I have a truck that works, and I was planning on swapping to a carb if/when I did a cam and headers. I think this truck just has too many fusable links and the wiring has some issues causing voltage drops
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