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Thanks for the response 3P. What your saying makes a lot of sense. However, I have to confess that in my first post I listed the TPS as a part that had been swaped out. In reality I destroyed my spare TPS trying to open it up to see if I could clean the wiper, haha. So I ended up installing a...

OK, Re-ran more tests today to collect some more exact data. First a little clarification on my test hook up which remains the same throughout all testing: A/F Ratio gauge is connected to the O2 terminal on the diagnostic block thereby monitoring raw O2 Sensor data via light show. Digital...

Thank you all for the fast response. JetJock: I have to go out of town today but will run it again when I return and post some exact Vf readings in both modes and different RPMs. will also write a clarification of my test hook up as you requested. Thanks again. Natan: Thanks for the Lucas...

Working on my son's 89 N/A 5-speed (bone stock). Here’s the situation: Plugs, Wires, Cap, Rotor and Air Filter are new. TB cleaned and Timing at 10 degrees. EGR valve is new and working as per TSRM (old one was completely clogged with carbon). O2 Sensor is new (Bosch) and checks out when...

I have been working on an 89 N/A recently and noticed that it throughs a code 51 if the A/C is not on or when the A/C Clutch shuts off. Code 51 does say "No A/C signal" as well as No IDL. If you removed your A/C you probably need to figure how to fake out the ECU with a 12 volt jumper. Maybe...