Need help with engine terminology...

[Mark B]

Hey guys,
I just got a Palm Pilot that has the ability to put error codes and other engine information from any ODB-II GM car. I have been getting all kinds of data from my engine, but I am not sure what some of it means. If any of you guys could help me with some of this terminology I would greatly appreciate it. Some of them I know what they are... But I am not sure if & how they would be helpful in tuning & montoring my engines performance



1)Long Term Fuel Trim
2)Short Term Fuel Trim
3)Manifold Air Pressure
4)O2 Sensor Readout
5)Throttle Position Sensor
6)Injector Pulse Width
7)Knock Retard
8)Mass Air-Flow Frequency
9)Throttle Position Sensor Volts
10)Mass Air Flow


Thanks

[Joe K. 99 Zeee!!]

Check out Fred's website (aka Injuneer). He has some good write-ups concerning just this thing.

[Injuneer]

Re: Need help with engine terminology...

3)Manifold Air Pressure Manifold ABSOLUTE Pressure

Try my
online Scanner Guide.

Long and boring, but it should help explain what each of those items is, and what values to look for in your scans.

[Mark B]

That is EXACTLY what I needed guys. I skimed through Freds page and found LOTS of good info. I printed it out and I will read it in detal later!!!

Mark B