My 1992 Toyota Pickup has a bit of a rough idle and hesitation on acceleration from idle. Runs great after the hesitation clears out. Plenty of power and no issues anywhere else in the RPM range.

It's been back and forth to my mechanic a couple times and all signs are pointing to either the ignition control module or the pickup coil being at fault. I ordered a new pickup coil and know the testing procedure for that, but cannot find a testing procedure for the ignition control module. I can't even find a replacement anywhere! Any help would be much appreciated as I am at my wit's end with this thing! Problem is marginally worse when cold.

Between my mechanic and I, we've replaced the coil, plugs, wires, TPS, fuel pump, fuel filter, injectors, IAC, FPR, cleaned the throttle body and intake manifold, checked for vacuum leaks, and replaced the timing chain/guides, and tried running it with the timing set at various degrees before TDC.

 

Welcome to YotaTech.

The ignition control module is commonly called the "igniter." Here's "a" part: 89620-35210, but it depends (believe it or not) on body style. https://parts.lakelandtoyota.com/sho...rimLevel=18380

There's really no FSM procedure to check the igniter. Here's everything I know: https://www.yotatech.com/forums/f116...gniter-287857/

 

Thanks for linking the thread about the igniter/ICM, I will read though that.

The exact part number from my truck is 19070-35280 (Coil with Igniter) and 89620-35280 (Igniter assembly). I don't think I need the assembly, just the igniter w/ coil. Would a different body style change the functioning of the igniter? Would a same-year 22re igniter work even if the part number was different?

 

Lakeland Toyota (the site cited above) can't find a part no. 19070-35280 . That doesn't mean it's wrong, but be careful with your source.

I don't know why Toyota has different part numbers for different body styles. I suppose it's possible that many igniters with multiple part numbers are all interchangeable. I just doubt it. But if you're ready to drop $480 on an igniter, I'd print Lakeland's page and walk it into a brick and mortar dealer to ask. Don't forget to bring your VIN if you do.

 

There are two different parts numbers on mine. I will include a photo below. Maybe I just need the second part number (for the assembly) and not the first? I assumed the assembly was just the housing, but maybe that's wrong.

 

I believe the upper, in that picture, is, as it says, for the coil (round thingy on the bottom, that has the heavy wire to the distributor) AND the igniter, the square thingy on top. All together.

The lower P/N is just for the igniter alone.

We may just have a minor communication difficulty, however, and be saying the same thing with different words, is all. If so, then I apologize.

I'm not sure at all what the P/N for the flower is though. I'll need to check the FSM for that. I think it's an option, I may well be wrong though

Good luck!
Pat☺

 

No worries! Ha! The pollen is a whole other problem, though not one that can be solved with wrenches and service manuals

Here's where I am now. I replaced the pickup coil this afternoon. Maybe a marginal improvement, but the old and new coil ohm the same, so it's probably in my head.

The truck runs better with more advanced timing. Like A LOT of advance. If I retard the timing, the hesitation is substantially worse.

 

I'm not aware of Toyota USA offering an Igniter with a coil, and the 19070-xxxxx part number isn't one I'm familiar with. But we replaced very few igniters bitd, so it wasn't something I had to look up very often. Same with coils.
89620-xxxxx would be the type of part number I'd expect for an igniter assembly(sans coil)
Fwiw, The ND part numbers aren't useful, at least not to a Toyota dealer. We were never given cross-reference information.

We had no testing procedure for either ECM's or igniters. It was basically test everything in the flowchart first, if they all pass than give them a shot. That's why in the FSM troubleshooting guide those two parts are always listed last. And in case you're wondering, we were never thrilled with the info provided in the FSM regarding electrical testing. Their specs, vs real world, didn't always line up.
From my experience Toyota igniters either worked, or didn't. Not much in between.

Question.
When timing is set to spec where is the distributer adjusting bolt sitting in the slot? centered, or off to one side?

 

I read this write up. He mentioned to be careful of cranking it without spark as the cylinder will fill with gas. When I was cranking my engine I don’t recall the spark plugs being wet or smelling any fuel. I’ll have check next week and see if fuel is spraying into the cylinders. I might have a totally different issues than no spark. I might have a no spark/ no fuel issue.



ignore this post. Posted it on the wrong forum

 

those couple of things are your distributor type, transmission, the coil setup.