Recent content by kgriff

Better late than never... I've got a nice Fluke handheld scope (Scopemeter) from a previous life, just never thought to apply it to this problem.

Some of these darned electrical and sensor problems can be real head scratchers, can't they.

Both. LOL Figured out thanks to all the nice folks here. What a great bunch of folks.

That she is.

I've got a bit more time putting things back together but for all intents and purposed, yeah, she's back out and causing trouble. Lucky for me my wife likes the 72 Jeep.

SHE'S RUNNING. Thanks to a PM from CB3G_GM that got me headed in the right direction. He suggested that, if the crank sensor I replaced was aftermarket, it could either be a bad part, or just not satisfying the ECM. I reached down to unbolt the crank sensor and, lo and behold, it was spinning...

I wasn't surprised at the voltage drop, just didn't know how touchy this vehicle would be about it. On older vehicles, I'm used to seeing as much a half volt drop from one point to another.

STA on the ECM is as it should be. I actually went through every ECM terminal that I could without the engine running and all checked OK. I've got 0.2 Ohms higher resistance when measuring from the ECM gnd terminal directly back to battery negative than I have when measuring test leads shorted...

And another question... Under the hood, on the drivers side, is a very conspicuous connector with "Diagnosis" stamped on the cover. What is this? Something I've always wondered, since I got my first 97 4Runner in about 2001.

Can you explain what you mean by "The ICM grounds the coil power is always on the plus side."? I'll take a look at STA on the ECU and see what I can see. I did find one slight anomaly. Measuring power to the ECU...one terminal is always 12V, another is 12V with Ignition ON. They are measuring...

Cam sensor swapped with T100. No Go. As a point of interest, and something else I've learned today, the T100 fired right up with the cam sensor unplugged. Probably wouldn't have ran well, but idled just fine. On to tracking grounds, I suppose. And rechecking all fuses. And rechecking all...

LOL. We talked about needing something like that. We don't. I'm just whining. I have shade part of the day from trees. Unfortunately, the best shade is morning and evening when it's cooler anyway.

MAF sensor swapped with T100. No Joy. I did learn something though. Contrary to the way some of these new-fangled, computer controlled, Pains in the Butt we call cars work, the T100 DID start with no MAF sensor installed. It died right away, but did start. I have experienced some vehicles...

Correct. No signal to all three coils, igniter known to be good. Live data follows, for the 4Runner and T100. Both not running, key on(obviously). The T100 is warmer as it was driven a couple hours ago. ODBII Item 4Runner T100 Fuel System 1...

Does sound like you might have a bad relay. Seems like swapping with your 99 is the simplest path forward at this point.