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1986 22re (W56) Random Misfire At Idle and 2000-3000 RPM Range

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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

1986 22re (W56) Random Misfire At Idle and 2000-3000 RPM Range

Old 12-18-2018, 05:10 PM
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So I rewired my injectors splices, ended up having to cut out a lot of black non conductive wires. also rewired the starter splices and fixed my cold start problem by rewiring between the injector and the thermo time switch. while I was in there I fixed the coolant temp sensor wiring too that was a mess and the previous owner had splices all in the harness with some of the worst soldering work I've ever seen it's like he'd never heard of tinning a wire or using fluxed solder . After rewiring everything the truck no longer pings and it runs a lot better with steady middle of the road engine temps under all driving conditions plus it starts right up in the morning now when before I'd be cranking it multiple times to get it to go. I still had the damn misfire after doing all of that but I had been running the 007 and 011 valve clearances and decided to set them hot to stock spec today and now the misfire at idle has completely cleared up some of the valves seems really tight too so I imagine they werent closing at the right interval because of it. Now the only problem I have is the misfire that comes on at around the 2k-3k rpm range. I'm changing gears and plan to look at the EGR system again, maybe the thermo vacuum valve is bad or something with the modulator or even the egr valve is opening too early or something because as far as I've read the EGR system starts pulling vacuum around the 2-3k RPM band. beyond that I have pretty much gone through everything else I can think of. what I had/have here is a case of multiple problems with similar symptoms so it made it hard to troubleshoot base on symptoms especially since the idle mis and the higher rpm mis now seem to be separate beasts when I was attacking them as if they were part of the same problem.

Last edited by outdoorjunky; 12-18-2018 at 05:15 PM.
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Old 12-18-2018, 08:08 PM
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Modulator is prone to failure, not aware of any work around or sources for nos parts. It's a big reason people do the EGR delete in my experience.
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Old 12-18-2018, 08:45 PM
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Originally Posted by Co_94_PU View Post
Modulator is prone to failure, not aware of any work around or sources for nos parts. It's a big reason people do the EGR delete in my experience.

i cant delete it though Iím in California Iíll be testing the modulator and TVV tomorrow just wanted to start with a cold engine to test the TVV.
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Old 12-19-2018, 01:23 PM
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Originally Posted by Co_94_PU View Post
Modulator is prone to failure, not aware of any work around or sources for nos parts. It's a big reason people do the EGR delete in my experience.
well this is lame because I tested this before and got reading in spec but the Airflow meter static test failed this time. For pins E2 to Vs I got 944 ohm at the ecu side so to confirm it wasnít wiring that went high resistance on me I checked it at the afm and Iím getting close to the same reading st the AFM pinout. The dynamic sweep test revealed a couple of 0L resistance readings. I pulled one from a junkyard a while back but it has a problem too E1-Fc has a small amount of continuity when itís supposed to be open infinite.

i also re-tested the TPS (which I replaced with a factory unit about 2 months ago) and itís all calibrated correctly and getting good readings at the ecu as well.

I tested the vaccum modulator and TVV and they are working and pulling vacuum at around 3500 rpm. Pretty sure my misfire is being caused by the AFM.

Last edited by outdoorjunky; 12-19-2018 at 01:45 PM.
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