Question about 1997 Oldsmobile Cutlass Supreme
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Posted on Jan 02, 2017
Save your money, the chip is a ohm resistor at Radio Shack for under $2.00. It splices in to you IAT wire harness located at the intake tube between the air filter housing and throttle body.
Problem with this system is, that you can not adjust anything and have to run a constant 91 octane just to make sure you do not have a Detonation. The ECM will catch the Detonation from the knock sensor and compensate for it by retarding the timing which in turn lose of HP till next start up.
If you like and don't mind the check engine light on once and awhile, you can do the same by just disconnecting the IAT wire harness which give the ECM a 0 resistance thinking it's -20 out side and turn the timing up and lengths the injector pules.
When i was running a Nitro in the Toy before i sold it, i had installed a 10K ohm Potentiometer which you can buy at radio shack for under $5.00 i believe, I just spliced it in to the IAC wire harness so if i wanted to play with the Nitro I'ld turn the resistor up making the engine think it's 185 degrees F and would ****** the timing so i would not hurt the engine. But if i wanted to get more timing i would just turn the knob to drop the resistance to get more time since the engine thinks it's -20 out side.
Hope this helps. Keep me posted if you need more info. Best thing is to do a dyno tune and you can change everything right down to the Shift points.
Posted on May 29, 2009
The IAT or MAT sensor (as equipped), is a thermistor (resistor which changes value based on temperature) mounted either in the air intake snorkel or the manifold (depending on the application).
Posted on Jan 04, 2009
There are two ways to reset the indicator light - the first is to hold down the button (hidden under the dashboard next to the steering column) until the light goes out. That's a reset.
There's also a reactivation, you hold the button until the light flashes three times and then release, that's for use after a wheel is changed, etc. Make sure they have done the reactivation, not just the reset.
If that doesn't work, have them check the technical service bulletins.
Everyone gets confused on this. I see it all the time. Good luck and thank you for using Fixya
The Highlander uses an Indirect Tire Pressure Monitoring System versus Direct type.
There is NO transponder in the air valve. The H/L uses a plain tire old valve. Thus, there is no PSI reading done by this Indirect Type System.
It uses the ABS speed sensors to calculate differences of tire rotational speed among the Four rolling tires(the Spare IS NOT included).
When the spare tire is put on, say when yu get a flat tire, the TPMS button must be pressed. (Recalibrated)
Direct Type TPMS costs more for Toyota and only puts it on select models. i.e. the Land Cruiser...
But for Toyota, the Indirect System meets DOT's TPMS mandated minimum Requirements for 2007 vehicles.
The Direct type system uses a transponder/PSI reader type Air Valve on each tire(including the Spare). Each of the 5 tires send a reading of the PSI to the reciever in the Vehicles TPMS ECU.
It has a small battery and is self powered. Battery must be replaced when yu replace your tires. It must be carefully mounted. Each tire has it's owner frequency channel and ID. for it to be recognized by the ECU.
This system is more precise. But has it's own set problems as a result.
It is the original design TPMS going back to the 1980's introduced with the Corvette and the Runflat Tire option.
Posted on Mar 15, 2010
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