Minor Mods

[Topless LT1]

hey guys hope every one is doing well. I have a questions regarding the computer on my 95 Z. I put a K & N filter which increased my air flow and I also instaled the foil in the throttle body which re-directs the air and reduces the turbulanced cause the design of the throttel body. My question is, is it necessary to reset my computer so it can re-adjust the air and fuel mixture?
it seems now that it's getting more air it wan't to stall in the morning when i got to start(not much) it but once it get going the problem goes away. our will the computer daignose the problem and fix it it self?

[Joe 1320]

Reset the computer... pull the fuse for a few minutes then take it out and drive it like you stole it. The computer will relearn the new operating perameters.

[Topless LT1]

COOL THAT SEEMS SIMPLE THANKS. I HAVE ANOTHER QUESTION, IF I DISCONECT MY BATTERY WOULD THAT DO THE SAME THING? WHICK FUSE WOULD I HAVE TO PULL OUT IN ORDER TO RESET THE COMPUTER?

[Jay 02 TA ws6]

Really??? This is something I have never done. I am supposed to pull the fuse every mod I make, then go out and drive it hard so the computer can re-learn? I feel like an idiot right now.

So, if I went home tonight, pulled the fuse, and drove it hard, the computer would re-learn and I would see a performance increase?

[Topless LT1]

Have any advise for me Jay?????
what would you recommend????

[Jay 02 TA ws6]

Not sure what kind of advice you are looking for... I don't think I am the guy to ask concerning your computer question. Especially since, it doesn't appear as though I was intelligent enough to know to reset my computer.

I really need clarification on whether or not that is something you should do with every mod you make. If it is... wow, I am an idiot.

I only experienced a problem with my idle on two different occaisions. Each time, it wastrying to idle at 400 RPMs, and I had to constantly give it throttle while I had the clutch in at stop lights -- defnitely made for interesting launches Anyway, both times I let the car sit for a while after turning it off... when I turned it back on, the problem was solved.

[Topless LT1]

reply

thanks for the inout I will pick other peoples brains and get to the bottom of this matter and let you know.

[Joe 1320]

The deal here is that the computer "learns" it's operating parameters based on airflow, temperature, etc. and stores it in the memory. You may to be getting the most benefit from modifications. By pulling the power to the PCM, the the car relearns based on it's new airflow, temperature, fuel quality, etc. If you don't reset, the car may eventually come around, it just takes mucho longer.

[Injuneer]

For minor mods it is not necessary to "reset" the PCM. It will make all the necessary adjustments all by itself. Because you have reduced the pressure losses in the intake by upgrading the filter, and streamlining the throttle passages, there will be a very small increase in air flow at WOT (only). The air mass flow is directly measured by the MAF sensor, so the PCM knows there was a small increase in air flow. It uses the calculations it makes to add the correct amount of fuel.

If for some reaon the optimum A/F ratio does not result from direct measurement and the "standard" calculations, the PCM, using feedback from the O2 sensors, will adjust the calculations to get it correct. It uses stored "long term correction" factors to do this. Pull the power from the PCM, and you make it start over in developing the large number of correction factors it requires to cover the complete range of operating conditions.

When you pull the power, you also clear any stored trouble codes, and the "learned idle" value for the idle air control (IAC) motor.

If you need to "reset" the PCM, I would advise against pulling the cable off the battery, unless you are sure you have the correct radio security code. Instead of pulling the cable off the battery, pull the fuse marked "PCM BAT" for about 30 seconds. In the 93/94 that fuse is in the panel at the drivers end of the dash. In the 95 and later models, I believe they moved that fuse to the underhood conveniencs box.

[SteveH95Formula]

Resetting the computer is only going set the computer to baseline. You don't have to reset the computer. It will eventually learn the proper mixture to give the engine from the oxygen sensor.
As long as the sensor readings are in range the sensors can pick up you should be ok. There might be some other problems like a broken wire on the MAF. If you don't have a SES then it shouldn't be. Make sure all the sensors are plugged in and sensor wires look good.

[SteveH95Formula]

If all else fails go the old fashioned way like the post above!
Just kidding. You should not get as much performance of fuel enconomy.

[Jay 02 TA ws6]

Thanks, that helps, I feel better.

[Topless LT1]

great I'll go home and check it out and keep you guy's posted.
once again thanks a lot for all your help.