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Bobster, I'm hardly a wealth of information. I know a great deal about a handful of things. That leaves me pretty ignorant about the world in general. You're correct in that EGR is there to reduce emissions of NOx. It serves no other purpose. The point is the car was designed for it. In the...

CSI doesn't occur beyond a certain coolant temp while fuel system rest pressure begins to subside as soon as the engine is shut down. These two variables are designed to overlap so if everything is working right the problem shouldn't happen. I've never had it. Check out the CSI system and rest...

In the case of a turbo car the AFM sends out a frequency (not a voltage) proportional to metered airflow. The ecu is programmed to cut injection when this frequency exceeds a certain amount. It's a function of the TCCS's fail safe mode. That's what happens. Why it needs to happen has already...

It's a simply circuit so it shouldn't be very difficult. Here's a tip: instead of the fuse use a 12 volt light bulb in place of the fuse. The bulb will limit the current. When you find the short the bulb will either go out or dim. That way you won't burn through fuses. Btw, fuses exist to...

http://tinyurl.com/qy7jd

Clay bar maybe? If his clear coat is shot will that work? I dunno, sorta outta my league here. I can't even remember the last time I washed mine let alone waxed it.

I'm assuming you're catless. Keep that baby a tad richer than stoich and you won't need EGR ;) I also have a car I do something similair with. Stays in closed loop (with sensor installed) but I can bias the loop to control at other than stoich. It's "dial a mixture" so to speak. Gets...

Of course, go for it. I was only referring to street cars. Off road any anything goes.

That's what I meant. The Supra's ESA system handles spark control full time. Heck, I have a 1981 model year car that doesn't have EGR at all and yet always passes NOx with flying colors. It simply uses a another method. But that's a different story than yanking off an EGR that's supposed to be...

Not sure what you mean by "correct" signal. ESA does all sorts of retard corrections based on various sensor input. Knock isn't the only one. What I wrote wasn't lifted directly from the manuals but was paraphrased from it. I could break them out and look but I know this stuff pretty well having...

Nope, it doesn't. Thats why I said "it's interesting to note". The guy just refuses to give up but that's OK....it's how people learn ;)

Rtfm...

As I said, I don't know why EGR use for detonation surpression was abandoned or never implemented. I only know that was what the original research was based on. This was many, many years before the Supra was introduced so perhaps it has something to do with the control methods available back...

Key words they are, as is "before i washed my car today..i noticed that my brake lights were on". This implies they were on *before* he washed the car. Could still be the box though ;)

Yeah, cheap they are not. I've been inside them. My life long philosophy has been to autopsy everything even if it's headed for the trash. Every time you don't you've lost a valuable chance to learn. As Grim says, as long as they're electrically OK and the bearings aren't shot then can be made...

What Grim said. I machined a plug for mine but at minimum you should replace that thing with every coolant change. Just make it a part of that service and you'll never forget.

Why do I think what? That EGR was originally researched as a way to reduce detonation? A) When I trained for smog certification I had to learn the history of emissions equipment. B) It makes perfect sense it would reduce detonation for the reasons Nick pointed out. I'm sure a little Net...

Info that some may find useful and to clear up any confusion: The knock sensors are piezo elements tuned to a peak of 7 hertz since this frequency is typical of knock. At this frequency the sensor's output is at the highest level. The ecu judges the "strength" of the knock to be at one of three...

That's true. Nor does it operate at idle. But all that's by design because it's been relgated to NOx duty. I don't know why but it was never implemented for detonation even though that was it's original research goal and it does work. You have to learn all this crap when you get a smog license ;)

It's interesting to note EGR was initially researched as a detonation reduction technique. It's ability to reduce NOx was a serendipitous discovery. My opinion is there is little to nothing to be gained by removing it and much to lose.