computer questions

I think its for all late model mustangs, 99-04 I know it works for, Unsure about the 94-98.

PancakeOfDoom said:

ok, i've heard that you can disconnect your battery, do some 0-60 runs or whatever, and your car will adapt to the gearing, and i've also heard of some trick you can do w/ your a/c to trick your computer into switching to a program that compensates for the compressor being on..., are these true when talking about the 2001 stangs? or is it only newer models?

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yeah, it's true for pretty much all the OBD1 & II computer systems.

kscoyote said:

yeah, it's true for pretty much all the OBD1 & II computer systems.

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Sounds like the ford people were into Star Wars a little to much when naming the systems.:kooky:

lcurle said:

Sounds like the ford people were into Star Wars a little to much when naming the systems.:kooky:

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On Board Diagnostics?

:winks

Hmm, I can vouch for the retraining of the computer, that works well... but whats this A/C trick you speak of?

mac_mogul said:

Hmm, I can vouch for the retraining of the computer, that works well... but whats this A/C trick you speak of?

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works more on the 94-98 cars -but when you turn on the ac, the computer advances the timing to compensate for the AC compressor. If you turn it on, then turn it off, it gives you a few seconds of power advance timing. Sorta like a power tuner for 87 octane for a few secs.

Try it, and you'll find you can spin the wheels fairly easily on a 94-98 car, which is hard to do otherwise.

It'll do the same on a 99+ car, but it's harder to notice the difference, since it already has 33% more power than the pre-99 cars.

ya, i noticed when i switch the a/c on or off when i'm idle the rpm changes by about 100rpm for a few seconds..., not sure what the hell that would mean if i were moving

PancakeOfDoom said:

ya, i noticed when i switch the a/c on or off when i'm idle the rpm changes by about 100rpm for a few seconds..., not sure what the hell that would mean if i were moving

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yeah, it's switching programs.

With my a/c on, it runs the compressor for a second, then it waits for about 7-8 seconds, and then it kicks the compressor back on again. Its a bit weird, as the engine kicks up 100-150 rpms for a second and goes back down.

could someone tell me how to reset the ecu this way? im not sure. i figured since i have a 160 thermo in it I should probally go ahead and do it

jthm2004 said:

could someone tell me how to reset the ecu this way? im not sure. i figured since i have a 160 thermo in it I should probally go ahead and do it

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TO reset the ECU, just disconnect the positive terminal on the battery for a couple of minutes.

But a 160 degree thermostat is way outside of parameters, and needs a chip or programmer.

http://www.kennebell.net/accessories/thermostats/thermostats.htm

WARNING! There are many suppliers who do not understand the relationship between the thermostat and electric fan in the newer vehicles. These people are living in the '60's with mechanical fans. Merely installing a thermostat will not lower engine temperature on a hot day. Why? The computer has programmed the fan on-off settings far beyond 160°. Example: "On" 215° and "Off" 190°. The fan won't even activate and try to cool the engine until the coolant temp is 215° so the 160° thermostat setting is useless. Answer? The engine computer must be re-programmed for lower temperature on-off settings. Example: "On" 166° and "Off" 162°. Now the fan and thermostat work in harmony to keep the engine cool. How? There's only one way - the Kenne Bell "Switch Chip" (Ford), Kenne Bell "OPTIMIZER" (Chrysler) - or a similar product - that can re-calibrate the fan.

The other thing to worry about

http://www.arrowheadradiator.com/overheating_causes_and_cures.htm

On newer vehicles with computerized engine controls, the wrong thermostat can prevent the computer system from going into closed loop resulting in major performance and emission problems if the engine fails to reach its normal operating temperature.

Damn damn damn......well thanks for the info. ill just put the stock 197 back in. well at least it was only 8 dollars right