El Honcho - 1st Gen Taco build

Hmmm my

$22 Foseal OBD2 Scanner, WiFi Car Code Reader Check Engine Light Diagnostic Scan Tool for iOS and Android

https://www.amazon.com/Foseal-Improved-Version-Diagnostic-inCarDoc/dp/B077F8F6TB Foseal OBD2 with Car Doctor (phone app) gives me TPS.

 

Stand corrected. Torque Pro has throttle position. Tested it on my Civic and it works. Put it on the truck and nothing. It stays 0% throughout the opening of the butterfly. Held it at a quarter just to make sure there wasn't latency. Nothing. Unplugged the connector, pushed it back in till the click, still nothing. Must be coincidence that the thing went out while it was off the truck????!!! Just pulled TB again. IAC is clean as can be but when I apply 12v to term B and ground to the other two posts respectively the motor clicks and moves the barrel inside a bit but one of the posts doesn't move the barrel at all. Have a new IAC on the way so I will just replace it. I've always had the high idle gremlin associated with the butterfly being off center by a millimeter. IAC has always given me trouble. Nevertheless, brand new one was cheap. Now I need to look in the FSM to see how to troubleshoot the TPS. I assume it's just resistance that I'm measuring?

 

Per FSM:

NOTICE: To prevent deterioration do not clean the throttle position sensor or IAC.

LOL well fuck me tender! I sprayed the TPS off with brake clean I believe... smfh!

 

Yeah definitely confirm whether it's receiving power and has continuity.

 

Long ago there had been a coating applied when the truck was new to the butterfly valve I believe I read, but so many guys have douched their TB's out using almost every CRC product over the years and not had bad results I don't believe that's 100% your issue.

I completely disassembled my throttle body and hosed it down with carb cleaner - still gotta see if the TPS is able to receive and pass current through it to complete the diagnosis at least.

 

Wow this TPS is fucked. LOL it must be in pieces in the inside. I took it off and all I hear are pieces of it rattling around in there. Wasn't like that before I put it back on two nights ago. I believe I changed this TPS in May of 2014 with one from O'Reily. Must have been getting old and worn out and completely broke after I put it back on. About to measure resistance but I doubt there will be any continuity.

 

Am I probing the middle pin on the connector for 12v with key on, truck off? FSM tells me how to diagnose the actual TPS itself. I had assumed 3 pin layout would mean power, ground and signal?

 

No continuity at all between VC (middle pin) and E2 (top pin) or VTA (bottom pin) and E2. No continuity period on any of the pins. Going to measure with device on TB.

 

Seems reasonable - yeah see what it's sending to the TB or at least check for continuity if possible from the ecu.

 

Boom, put it back on and immediately noticed the clock spring is broken. That's the rattling sound. So I guess this thing was on it's way out, put it back on the truck after doing the headers, drove it fine for 5 minutes and put away. Go to sleep, next day go to drive truck out to the dez and boom no TPS response in OD. Shit was ripping in first and second though which was weird that it was understanding the throttle position in first and second but not 3 or OD. Must be something in the ECU related to electronic transmission. Anyways, definitely a broken TPS. Amazon is pissing me off right now because all of the prime shit is not 2 day for the time being. A few items have come in 2 days but this TPS was marked as prime but not coming until Saturday, five days after the order. IAC not coming until Friday or Saturday as well so I guess the bitch is parked for another week.

Dalandser thanks for your continued support amigo!

 

I'm assuming middle pin is power and then the other two pins must be sending resistance readings back to the ECU or one is ground and one is signal sending resistance measurement back to ECU for throttle position. I'm about 99.9% sure everything is fine on the truck. Pry won't bother until I get the new UNIT (shoutout Cleetus) and then just plug in and see if it's gucci.

 

Do you need a tps??

 

I bought one on Amazon Sunday night but it wont be here till Friday. It's a cheap one. What do you have?

 

Let me check the brand.

 

I can't win right now. I got everything today and put it on. No CEL now but super high idle. Worst part, somehow the bottom left bolt stripped out the hole in the plenum. Not sure wtf I'm going to do about that. Can't understand how that happened. I started the bolts a couple of threads by hand like always. It's been on and off 4 times in the last 3 weeks. It was weird it just barely tightened up and then bam like it wasn't tight and keeps spinning. I guess maybe find the same length shanked bolt but one size up and tap the plenum???? Super pissed about this! Not sure if that is my high idle or the IAC. I hate this idle step motor. Is it even needed in Phoenix AZ?! I thought it was for colder climates to warm engine up faster??? So disappointed right now.

Current status: Idle is at 1850. If I snap the gas up to 4k real quick and let off it falls to about 1300 before suddenly "catching" and then right back up to 1900... just sitting there idling at 1900. FML!

Does the ecu need to relearn? I've cleaned TB before but don't ever remember it being this bad.

TPS IS FIXED. No CEL for TPS or IAC now. Confirmed bench test IAC before install.

 

Vacuum leak somewhere??did you put on the gasket correctly? I just have a off brand tps. Glad you got that sorted.

 

Bottom left bolt for the TB stripped somehow. So pissed. Im sure air has to be getting in right there.

 

I have a spare plenum. In Mesa.

 

Update: I took the TB off for the 4th time this week to check the holes on the top plenum. The bolts that were in my TB seem to have been a couple of mm short on the bottom. Only the first 25-30% of the threading was stripped inside the hole. I bought a little bit longer 8x1.25 mm bolt and was able to get it tightened down.

Problem is, it didn't do shit for my high idle. Truck is idling at 1500 sometimes as high as 1900. In drive the truck idles between 950-1100. I've checked all known spots for likely suspects. I've read every throttle body thread over the last 10 years so I know what the likely suggestions are but everything seems to be working. Bench tested the dash pot. It holds vacuum or at least when vacuum is applied for a couple of seconds it definitely sucks in and holds. The butterfly has a tiny bit of play as other have noted. Already did the test of pushing it fully closed/making sure the butterfly is centered. It maybe brings the RPM down 100 doing that so I don't think that is the problem. TPS is working. IAC was bench tested and the barrel inside moves. IAC and gasket are brand new.

Does the brake booster have any effect on the vacuum system or throttle body? This is weird but I have a feeling this is brake booster related. I came across a comment on an old thread where someone mentions brake booster as a potential vacuum leak spot. My mechanic years ago told me he thought I would need a new brake booster some day or he thought it was weak or potential air leak. Not exactly sure. I've always had the worst brakes and now with the rear LT and no Toyota proportioning valve hooked up. Pretty sure I'm driving with front brakes only right now. LOL fuuuuuuck!!!!! One problem after another. TRUCK WAS FUCKING FINE BEFORE I PUT THESE HEADERS ON. 3 weeks later while the truck was sitting the TPS goes out or completely falls apart on the inside and now the truck won't idle correctly. I swear to god, how does this fucking shit happen?! !!!!

 

No cel? Could your o2 sensor be bad and its seeing a lean condition and the computers trying to compensate for it??
You could try pinching off the brake booster line and see if that has an effect. that would help rule out the brake booster.