Now that the weather is getting better, I took my Camaro out for a spin while running a datalogger, TTS Datamaster.
The car runs well however my brother and I noticed something qwerky when reviewing the file. At WOT we noticed that voltage from the TPS was in the amount of 4.74v and the TPS = 100% for a brief second between 34-40 mph. From 60 - 100 mph the TPS voltage registered 4.88v and 4.82v respectively. The TPS = 16.5%. The engine makes good power, for what I can tell. It looks as if the o2 sensors are affecting the fuel during this time, perhaps causing a lack of power.
Does anyone have any input on this subject? Thanks. Steve
I've taken a look at other posts. Most comment on the 100% TPS for voltage from 4.7V - 4.9V. Just wondering why TTS is reading me with 16.5% when it should be 100%.
Happy Easter!

 

I would start by making sure the TPS is still good. I would then check the wires for any shorts.

 

Already ahead of you. There is absolutly nothing wrong with the sensors or anything.
I'm thinking this is with TTS Datamaster, but not positive. Could be in the ECM.
That's why I hope those people with datalogged runs will take a quick look at those WOT times and see if they find the same thing.

Thanks!

Steve

 

This could just be a TTS logging "glitch". Not sure how you could have over 4v and only 16% when just prior to that you had 100% with the same voltage reading??? Not sure how the PCM could do that to you and if it were real, I'd think you'd actually see the car "hiccup" in performance at that time as well.

I've not heard of this type of logging issue but not sure what else it could be???

 

I've reviewed hundreds of scans for people, and every once in a while you see logs with data that makes no sense at all.... most of the data looks fine, but there are sporadic data entries in one or two records (like a 500% DC on an injector) that is impossible. Somehow it seems like the scan software loses synch with the PCM and puts the data from the PCM in the wrong spot.

Are you sure you have the correct version of DataMaster for your PCM, and that you have the latest updates from TTS?

 

Yeah, I've done lots of data reviews and sometimes it's just crazy the values that are recorded.

I will check on the latest TTS version, however, to my knowledge at this time, everything is correct, etc.

I'm going to do a few more runs to see if I can recreate the situation.

Just another note, the TPS sensor itself has not been modified. I know that depending on the year of vehicle, etc. it may have to be put in at an angle to make sure it reads correct for idle and WOT.
When I am at idle, the voltage is .67.
The TTS showed 100%TPS when the value was 4.74, however once the voltage went over 4.79 it showed 16.5%TPS. I will, when I have time, trace the wire to make sure there is nothing wrong with it.
On another note, the pulse widths for the still large, but changing with the o2 oscillation. It may be because the MAP registers about 98.4kPA or there abouts, keeping the pulse long.

I will attempt to recreate the situation when I'm not as busy with work. If you would like to see a copy of the file, please just leave your email address.
I appreciate all the help!
Summer is almost here .... <sigh of relief>

Steve

 

That's good to know I know you have looked at WAY more logs than myself... heck, I mostly have just looked at mine!

Thanks for the info, Injuneer, and verifying this is likely a data logging issue!