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What happens when you enter diagnostic mode is the microprocessor outputs from a specific memory location a timing value based solely upon CPS position. This value is called different things here but the correct term is Initial Timing. The Initial Timing signal is output through a back up chip...

^ There is no wiring between the CPS and igniter...

By "enhancing" I meant fuel economy, either additives or hardware. Octane enhancers fall into a different use category. That said your engine has an active knock control system and should not audibly ping on 91 if everything is working right.

With the coolant sensor unplugged the ECU defaults to a hot value. That effects both cold enrichment and timing. I doubt his AC is involved in the 51 because it appears he didn't remove the amplifier. I dunno though since he communicates things very poorly. I'll agree on one thing: many of his...

The operative words here are "felt" and "feel". They are words by which snake oil firms survive. There's a simple answer to all this, the same one that applies when dealing with fuel "enhancing" products: Oil companies spend billions developing a product for one of the most competitive...

CRE: Ok, just checking. Agree about the OP. Pretty clueless...

^ What is this mental block you're having about disconnected AC and code 51? I thought we covered that? ;) Lets try being a bit more technical: http://tinyurl.com/4gla45 The G/O (V/W) wire entering the AC amplifier on pin 2 is the AC on signal coming from the CC panel. It's the signal that...

Oil temp of 140 is indeed bad news. His saving grace is that it gets higher at other times. Water is one of the two main byproducts of combustion and the oil must reach at least 180 in order to get rid of it or sulphuric acid forms. It's why short trips on an otherwise normal oil system are...

A flash of insight in what's bordering on a BLB (blind leading blind) thread. It's why you should ignore some of the advice you're getting, especially those last few bits...

In the interest of accuracy a couple of comments: 1) A break in the AC signal won't cause a code 51. On the contrary, it proves the signal line is intact. 2) There can be no "resetting" of 51 because it never gets stored in diagnostic memory. It's a real time code that will disappear when...

3P: Yes but the only Intel MDS I worked with back in those hey-days of MPU development was the Series II that ran ISIS. It's emulation capabilities didn't support this device. There were others that did however. A logic anaylzer was also used.

I wish everyone would read every article from Autoshop 101. It'd make my life here a lot easier. Yes, Vf with the diag block not jumped is an early type of adaptive strategy indicator. It's Toyota's predecessor of the fuel trim values found in OBD II systems. However Vf with the block jump...

That's true but consider other conditions. For example if you climb a grade with partial throttle and boost it may not go to 70% and open loop. Instead it may go boom...

It's simple: Lean running should only be done with care, in steady state cruise at part throttle, say on flat stretches of highway. Normal fuel control must be returned to the ECU before making demands for power.

Wise move. Think parking space with other cars nearby. Think garage. Think garage with buddy in front of car while you're both working on it. I never stand in front or back a car when it's being started, something I see a whole lot of people do. They be crazy...

Yeah but he seems more confused by the post. Lets back up. Since Vf is unique to Toyotas why would the ZT2 have a specific input for it? Why would it need to monitor Vf to perform any of its functions? I see no mention of a Toyota specific model of the instrument on their website. All I see in...

A look at their install instructions shows a general purpose user input. In that case yeah, I suppose you could have hooked Vf up to that. However since Vf outputs an emulation of the narrowband signal only when in diag mode with the engine off idle I don't see how it'd be useful for anything...

Well, there you go. Shot yourself in the foot ;) Btw I hoped you wired up the clutch safety switch too because you will crank that baby in gear someday. I guarantee it...

Yes, when you went 5 speed did you jump the connector to get the engine to start? If so that would do it.

A quick look seems to show that unless the wiring had been modified at some point that input shouldn't have been connected so as to prevent the CC from working in the first place since it still should have been wired through the NSW. Maybe you jumped the NSW connector during the swap? I dunno. I...