Ive adjusted my tps to .54 volts. my multi meter is freshly calibrated. My throttle response isnt very smooth. Ive plugged in my old snap on scan tool and it shows my tps voltage at .58 volts. Any ideas?

 

The Modis/Solus scanner reading the ECM data is reading a digital data stream. It does not measure the actual voltage. Your actual, real meter is probably more correct than the signal conditioned value in the serial data stream.

The ECM receives the analog voltage value and scales it across a resistor network, converting it to a current value which is used by the A/D converter to produce a decade-digital value for the ECM to process.

It's astounding how many "technicians" (part-changers) swear that a specific input or part is O.K. or bad based upon the scanner, and are mystified when a replacement part does not correct the problem. A rudimentary understanding of the system reveals that the ECM/PCM is only interpreting an input, and may not always reflect reality. Just remember that the scanner is a quick way to look at a lot of systems and data points, but is only PART of true diagnostic analysis.

In any event, the signal is in the acceptable range for the 1227165 ECM to handle as normal. Recall that the acceptable range is 0.48-0.62V for 1987, and your ECM thinks that zero throttle is 0.58.

 

okay thank you very much. I have been having MAF high voltage problems and more recently o2 codes. I will dig elsewhere as to why some times i have a very jerky acceleration.

 

Even though you have the TPS adjusted to spec, don't discount having an issue with the sensor's sweep through out it's range.

Perform a sweep test.

 

yes ive performed a sweep test. was one of the first things ive done. The problem is else were. Was just thrown off by what my meter was saying vs what a scan tool was saying. i believe my problem lies with the MAF and O2 sensors. this issue all started once i started getting those codes.