Attention. any 2001 100 series owners with a scan gauge 2?

[CappyKD]

I wanted to verify my TPS adjustment and found that my hot idle TPS reading via the scan gauge 2 is 13. Can someone check their hot idle TPS reading please? I suspect that mine is a little on the low side.


Thanks
Kirk

 

[AimCOtaco]

IIRC mine was around 16 with the SGII on my '99 Series 100. Given your value of 13 you may be a hair low or the system may still have plenty of range to work with. Probably couldn't hurt to adjust it up a bit either way.

 

[CappyKD]

IIRC mine was around 16 with the SGII on my '99 Series 100. Given your value of 13 you may be a hair low or the system may still have plenty of range to work with. Probably couldn't hurt to adjust it up a bit either way.

Thanks a lot. I think I am low. Ever since I swapped the TPS with no FSM or proper tools I idle a hair lower than where I used to. Almost positive that they are related.

 

[CappyKD]

Any one else with a Scan Gauge?

 

[AimCOtaco]

I would just try it and see. The SG is very sensitive to TPS adjustments so it would be easy to put it back as it was if it doesn't up your idle. Good Luck.

 

[SanDiegoCruiser]

Mine is 16 as well.

 

[CappyKD]

I would just try it and see. The SG is very sensitive to TPS adjustments so it would be easy to put it back as it was if it doesn't up your idle. Good Luck.

I was going to just try it out when I am working on installing my rear ARB bumper this weekend. Thanks again.

 

[CappyKD]

Mine is 16 as well.

Thanks! Now I know I am 3 points low. Time to adjust this weekend when I am already wrenching on the truck.

 

[2000UZJ]

I'll look tonight. I think I hover around 16 as well. .54 gallons per hour.

 

[CappyKD]

Tried adjusting it today. It sits at 14 now but if I try to go more it seems to not want to idle. I must have this installed wrong, still adjusted wrong or a bad tps. I am going to need to Install and adjust the FSM way.

 

[AimCOtaco]

Hmm. Any more background on your problem? When did it start? Did you ever get any error codes? What are your idle rpm values like? Does it otherwise run ok?

Maybe reset the ecu and see if a relearn helps?

 

[2001LC]

I'm in ""process"" of cleaning up fuel system to correct bad/rough idle. Any chance you got some bad gas in Moab Ut, could this effect the TPS code?

 

[jemsec]

Just ordered a Scan Gauge II from Advance Auto Parts. Used discount code TRT30. Total of $123.19 including freight.

 

[2000UZJ]

Cold idle:

 

[CappyKD]

Cold idle:

I appreciate you posting up the pic. I am actually looking for the TPS reading like this:





This was hot, coasting about 2 mph.

 

[CappyKD]

I'm in ""process"" of cleaning up fuel system to correct bad/rough idle. Any chance you got some bad gas in Moab Ut, could this effect the TPS code?

Oops answered your question above. I have Sea Foamed it in the last 20k though it is still due for another round and a more thorough throttle body cleaning.

 

[CappyKD]

Here is the link for the full description and history.


https://forum.ih8mud.com/showpost.php?p=8878934&postcount=25


Thanks,

 

[AimCOtaco]

OK, I read you're mega post and I think I'm more or less up to speed.

One thing that I've seen that not everyone agrees with me on is that all of the swapping of TPS and APPS sensors is really chasing a symptom and not always a cause. The throttle plate as you know is motor driven. The drive includes a motor, clutch, and gear train. The gear train may or may not be well sealed at the throttle plate shaft so the gearing and grease may be contaminated over time. Cleaning the TB may get solvents into the gear train that might free it up for awhile as it works away at the grease. Long story short, I think a lot of the TPS/APPS codes are rooted in failure or stick in this gear train that really can't be accessed or serviced.
When we bought ours it would throw an occasional TPS code, mostly after a long rest or when cold (sticky gears?). I ultimately changed the TPS after getting several TPS codes on several different occasions over a few months. The problems continued. Now we would get TPS or APPS or MOTOR codes periodically as well.

Long story short I elected to go for an all new throttle body from Toyota, that way I got new factory adjusted TPS, APPS, Motor/Clutch, Gear Train, Throttle Plate, and it was shiny clean to boot.

Did I overdo it or replace parts unnecessarily?
Years later I've never had another related code and the engine runs and idles smooth as can be so I don't think so and don't mind if I did. (that said the price of a new TB went up right after I bought mine)

From all of this, I'm not a big fan of overcleaning the TB to the point that you contaminate the gear train and it's lube. If you really want it clean I would pull it off and do it on a bench and use gravity to protect the gear train.

There, mega post for a mega post. All just my thoughts on this, YMMV

 

[AimCOtaco]

Very interesting Amingo,...

Amingo, I like it, sounds like a friendly latin dingo. I shall henceforth be known as "Amingo del seire 100"



I really do think there is a limited lifespan for the TB no matter how it is cared for. I do think over cleaning could be detrimental. I also remember reading here somewhere that there may be a TSB that addresses this exact issue and that dealers started changing complete TB assemblies when faced with these codes. Search if you like but I'm good for awhile with mine I hope.

 

[CappyKD]

To answer an earlier question I am idling at 600 hot and in gear.

I am considering a trail spare throttle body, but it would need to act up again before I could justify the expense.