A little help! 94 fzj80 randomly dies and won't restart for 10 minutes

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So I borrowed a Snap On scanner until I can get my cluster apart to change CEL bulb.. and the scanner shows

"Code 13 RPM signal circuit or short"

Any suggestions on how to proceed? I can find much information on this code???

Thanks in advance!!
 
Go download the fsm. It should have a step by step process for that code.

Check connections and connectors at the distributor and ignitor too.
 
The FSM seems a little vague on the troubleshooting aspect of code 13. And I've searched and searched and can't really find a solution, or even where else to look. I've inspected the wire connections of the distributor and coil, and I swapped the main coil wire from my other 94 and still no changes. I pulled a plug and appear to have good spark.

However It still randomly stalls. I have found pumping the pedal helps it start faster after a stall instead of just cranking and cranking. But it will idle and run rough for a few seconds after it stalls. Then clears out, runs fine for a while then randomly stalls again. Repeat...

So here's what I know.

FSM code 13
"No Signal to ECU when engine speed is above 1000"


-Distributor circuit
-Distributor
-ECU



Has anyone experienced this code 13, and perhaps there is a common Code 13 issue or fix that I'm overlooking or haven't found in my searches?

Thanks again for any info.
 
To me sounds like a bad or stuck IAC (Idle Air Control) valve. Look that up in the FSM for diagnosis.
 
A bad IAC won't throw a code 13

@ampline I'd look inside the distributor for stuff stuck to the cam angle sensors. IIRC they are magnetic. Also do the usual check of harness near the EGR pipe to see if there is any melting. The 6 (I think.. and it's 3 twisted pairs) relevant wires run from the distributor to the ECU in a thick blue-shielded cable. If wiring looks good you might try swapping that distributor with the one in your other 80. Usual precautions about indexing the timing gears apply.

Also for anyone else reading, you can still check codes on a OBDI truck with a burned out MIL bulb. In the Data Link Connector under the hood that you use the paperclip to start showing codes, there is another terminal marked W. This is a branch off the circuit to the MIL. Run a multimeter to +12v and the ground lead to this W terminal and it'll flash +12v on the meter in the same way it does the light for codes.
 
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