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Unfortunately, the issue is still not resolved.

I replaced the O2 sensor in early June with a brand new Denso unit. The ghost Code 21 was gone.
But it has not resolved the issue, as I feared. ...

Coil is most likely original. Visibly it looks perfectly fine. I've tried with overdrive off and it seems to be much more random. It usually doesn't act up in lower gears unless its acting up...

I am armed with more information.

No there is not a TPS PID or any other throttle PIDs. I recorded a video on a short highway stint, hovering around 90-110kph depending on hills and how it was...

I don't remember if it listed a TPS PID. I will bring the Actron next time I go for a drive and check. It does list rpm, but doesn't seem to be very accurate; usually reads higher than actual.

I...

I definitely suspect the knock sensor for certain now. But I don't really know how to prove it.

I found out by doing a bit of light research that basically all JDM cars, of this vintage, run off...

I am going to preface this by saying I haven't checked the timing yet, nor have I tried the code reader again.

That being said, I believe that the sensitive knock sensor issue may be on the right...

Yeah, I can't use a scangage at all due to a lack of OBD2. Its a 94, after all. I'm fairly certain the scan tool I have, while it can read Toyota OBD1 in my Corolla and US Previa; when I tried it on...

How would I check the timing? With the engine placement I'm not sure where I'd use a timing light. With the JDM ECU, I don't think my code reader works.

It is an Estima, original destination was Japan as I believe I have mentioned earlier.

I've noticed the shift speed for O/D is 45mph in my 2wd US spec, and the 4wd JP spec seems about the same....

Well, I have a slight update.

I checked the FSM, and it seems like to check the supercharger bypass valve you need to remove it (and possibly have some kind of bench power supply). So most likely...

Ok, thank you for confirming.

This does mean that the rear end on the Estima is most likely good. Unless someone swapped the axles from side to side (if that even matters?).

I don't believe there is any sort of locking on the Previa 4WD, its just got some sort of transfer case/center diff and runs as full time 4WD. Front and rear tires are the same size, I just recently...

Hello all,

I acquired a 1994 Estima S/C 4WD last year, and its a blast to have two drastically different vans to compare and of course drive/work on. This is a rhd van, but for all other intents...

The IAC valve is what the ECM uses to control the engine's idle at any given time. The ISC valve would be activated with the AC switch to raise idle when the AC is activated.
The higher rpm cold...

Thought I might tack onto this since I just replaced my whole exhaust last year.

My van had a horrid exhaust on it, the flex pipe was severed off at the front from rust and age; the cat was...

Personally, I would start with the T-Junction. It's easier to get at and 9.8 times out of 10 will solve the problem.

On my left hand drive van, it had the high idle issue; cleaned the T-junction...

New update:

The Van has been doing well. As weather warms up, I've been driving my project cars a bit more.

Today I fixed the EGR for good. As I suspected, the passageway was still clogged....

I finally got around to checking the EGR valve and now have an update.

I scanned in the pages from the FSM for this DTC, so I am now armed with what Toyota considers to be the causes. However, I...

Yea I'd have to look in the FSM for 95 to see what the EGR codes are, and their criteria. My van is quite weird, it has an OBD1 port under the seat but also an OBD2 port under the fuse panel cover. I...

I pulled vacuum on the small nipple on the EGR itself, and pulled vacuum on the bottom of the modulator. Just like I did with my Corolla to determine it needed a new modulator. Both were a-ok last I...

That was the very first thing I checked. I pulled vacuum on the EGR and the modulator to ensure they are functional.
The EGR system on late 80s and most 90s Toyotas all work basically the same from...

Transmission - Yes I think I'll probably just do a drain and fill, replace the filters and the pan gasket.

SADS is fairly low on my priority list right now considering it seems to be ok despite...

Hello, I am new to the forums. I bought my 95 SC 2wd back in February of this year, and its had a ton of problems. Started and drove reliably, but whew, so much wrong. I've finally caught up on a lot...

I see that you have an SC van, so I would take a guess that your high idle is actually likely to be the black flakes in the coolant T-junction by the IAC and air intake hose underneath the front...