PDA

View Full Version : '87 2WD LE CAL emissions - Misfire on 1 - have spark. Codes 2, 8, and 11.



tehAndy
06-17-2020, 01:09 PM
So my van's been sitting for quite a while. I'll take us through the chain of events of the last 24 hours.

- Last night at 11pm - arrive home, knowing I'm going to need the van tomorrow so I go to move it.
- Lights but no crank
- Jump it with box and move it - runs fine.
- This morning, go to run my errand.
- Starts fine, runs fine for first minute or so.
- Starts misfiring as I'm going along.
- Smell something burning as well, briefly.
- Turn around, go home
- Get home, track misfire to number 1, verify that I have spark at that lead.
- Check vacuum connections, look for anything burnt, etc.
- Pull codes, and it blinks 2, 8, and 11. (MAF, IAT, and 'switch') respectively.

If I give it some stick, the misfire briefly goes away at idle, but then settles back into it. It will also sometimes go away for a second on it's own. Makes me think it's one of the idle switches, but I'm not sure if or how these three codes interact. And I still can't explain the burning smell.

tehAndy
06-23-2020, 12:21 PM
I've been tinkering around and found the following.

- 12v at both terminals on 1's injector harness.
- injector resistance 2.5 ohms
- 35 ohms of resistance on both terminals to a body ground with ECU disconnected and out of car - seems odd?

I pulled the ECU and found this:

https://imgur.com/MWIRobJ

https://imgur.com/MWIRobJ