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Before you start asking questions, read this: http://www.supramania.com/forums/showthread.php?t=62838 It's one of the oil T-stats in the above thread...that's why it's a sticky...to answer questions such as yours ;)

Oil pressure will not cause low boost...your problem is elsewhere. Checked for boost leaks?

Perhaps you should take the time to read the question...this thread is about the check valve under the ISCV, not about removing it. Removing the ISCV disables all of the ECU idle-up functions...it's not a good idea when running the stock TCCS.

1 - This is not a DSM 2 - The TCCS is completely different 3 - The knock sensors on the 7M have a very specific frequency they "listen" for...7kHz to be exact. That is due to the racket this motor makes internally when under normal running conditions. 4 - What you are calling "phantom knock" is...

It's a fresh air vent: http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=EC&P=6

Most codes will not illuminate the CEL...here's how to check: http://www.cygnusx1.net/supra/TechTips/engine_error_codes.aspx BTW - it says you have to start the car...all you have to do is have the key on. I would start by clearing all codes by pulling the EFI fuse (in the engine bay box)...

Check the turbo coolant lines (easy). Next is the 90 deg hose from the hard line around the block to the bottom of the water neck...unfortunately, this is the more likely. If any of these lines pop, you will lose ALL of your coolant in a very short time.

A Stant SuperStat is as good or better than OEM...you want a 190 deg. Removing the jiggle valve is a very simple way to keep the system free of air...make sure it's at the 12 o'clock position in the housing.

Excuse me, but WTF is "phantom knock"? I have a novel idea, how about checking ECU codes?

Why do you need a new one? If it's a boost leak, it is likely the check vave under the ISCV.

You're not "getting it".

I was not being rude...I was being blunt. Something you might not be used to: The Tech section is not the place for "I think", "I heard", "my Uncle's Brother-in-Law told me" or any other info except the facts. I meant what I said...look it up before you post. Policing this kind of thing...

So the check valve in the canister has nothing to do with keeping positive pressure inside the tank so the pump doesn't cavitate? Might want to take a close look at the TSRM sport before you spout off in the Tech section.

Why do you think the coolant lines are routed to the TB and ISCV? It's not to cool them off.

Tell us how you really feel Zum ;)

This is for a '90 I do believe: http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?S=FI&P=50

You can throw parts at it if you wish...personally, I would test it 1st: http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?S=FI&P=101 The problem could easily be the wiring and not the TPS...check wire continuity between VTA at the TPS and VTA at the ECU. In addition, measure voltage...

Keep something in mind...intake icing is most likely between 0-10 deg C (32-50 deg F) with humidity above 70% and/or visible moisture (rain, fog etc) present. It doesn't have to be winter weather for it to happen.

Well now you know. The term is bad because the ECU substitutes values based on what sensor has failed. In your case, both a code 52 and code 41 will cause the ECU to go into fail-safe. The knock sensor failure will set the max timing retard angle...the car will run like crap, but not cause...

The TB & ISCV coolant lines are there to prevent icing under certain OAT and humidity conditions. Bypassing these lines will not lower intake air charge temps. You can bypass (do not unhook and cap) by connecting a line from the front intake manifold runner fitting to the return line connected...