Failing TPS symptoms - YotaTech Forums


Go Back   > >


86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Failing TPS symptoms

Reply
 
LinkBack Thread Tools Search this Thread
Old 07-20-2006, 05:22 PM   #1
Registered User
Personal Sales Rating: (0)
Thread Starter
 
toyo22r's Avatar
 
Join Date: Jan 2003
Location: Surprise, AZ
Posts: 84
Failing TPS symptoms

The wife took kids to the state park for swimming. On the way home she had to go up some rather steep hills. She said that the 4Runner would barely climb them at 10mph, with AC off....

I suspected the TPS. As i seem to remember reading a failed or mis adjusted one would cause the symtoms of no power off the line. I shorted TE1 & E1, and just as suspected there was no change in the idle speed, another symptom of a bad TPS. When I put the timing light on it the mark was lined up 'most' of the time, but you could see it jumping all around... it did this with and WITHOUT the check connector shorted.... is this yet another symptom of the TPS?

I tried adjusting it, but doesnt seem to want to hold it... I had it adjusted, shorted the check terminals, idle went down as it should, but by the time i got the timing light hooked back up it was back to idling higher as if the connecter wasnt shorted... I'll pick up a new one tomorrow at the dealer... but i guess what i am getting at is.. will a bad TPS cause the timing marks to jump around like that, or is there something else wrong i need to look for.

Thanks,

toyo22r@hotmail.com
95 4Runner
St. Louis
toyo22r is offline   Reply With Quote
Old 07-20-2006, 09:18 PM   #2
Registered User
Personal Sales Rating: (0)
 
trythis's Avatar
 
Join Date: Jan 2006
Location: Kansas City
Posts: 669
Yes, your timing could be impossible to set with a bad TPS, depending on why it is bad, but yes, that can happen. Well it did for me.
trythis is offline   Reply With Quote
Old 07-21-2006, 05:43 PM   #3
Registered User
Personal Sales Rating: (0)
 
toyotaoffroad91's Avatar
 
Join Date: Mar 2005
Location: long island, NY
Posts: 343
how did u make out im mine is sort of doing the same thing
toyotaoffroad91 is offline   Reply With Quote
Old 07-21-2006, 05:49 PM   #4
Registered User
Personal Sales Rating: (0)
Thread Starter
 
toyo22r's Avatar
 
Join Date: Jan 2003
Location: Surprise, AZ
Posts: 84
Well i readjusted the tps, after checking it, it wasn correct... i think my feeler gauge must have slipped. I wasnt able to do a long test drive, but my wife took it to work and claimed it ran great, better than before.

I also called a Toyota tech who said that when the connector is shorted, the timing will retard just a couple degrees (which i observed) and also said that most of the time you cannot hear the change in idle. Which i still think is odd... with my Camry there is a noticable difference in idle with the check connector shorted.
toyo22r is offline   Reply With Quote
Old 07-21-2006, 06:11 PM   #5
Registered User
Personal Sales Rating: (0)
 
trythis's Avatar
 
Join Date: Jan 2006
Location: Kansas City
Posts: 669
The problem with a bad TPS is that you can set it and drive for a minute, an hour, day or even a week, but it will fail to stay in adjustment. If the thing doesnt stay, just buy a new one. They are $100 or so but make a major difference in how the truck drives, especially with an automatic, as gear shifts are controlled in part by the TPS signal.
trythis is offline   Reply With Quote
Old 07-21-2006, 06:31 PM   #6
Contributing Member
Personal Sales Rating: (0)
 
Snorkeldepth's Avatar
 
Join Date: Aug 2005
Location: Orange County, California
Posts: 590
With all the talk about adjusting the TPS, I was wondering . . . . . if you buy a new one does is come adjusted correctly?
Snorkeldepth is offline   Reply With Quote
Old 07-22-2006, 11:40 AM   #7
Registered User
Personal Sales Rating: (0)
 
trythis's Avatar
 
Join Date: Jan 2006
Location: Kansas City
Posts: 669
nope, the adjustment is made by positioning it on the intake body. It rotates a few degrees. Change out the phillips screws with socket head cap screws so you can adjust it on the engine, if you want to make it easier in the future. If you take it off and the spring loaded dealy-bob in there doesnt snap back, You'll need a new TPS.

You also want to make sure the intake flap is closing ALL the way. Mine had carbon build up keeping it from closing and the TPS never reads at 0 position. It is amazing how much gets screwed up if your TPS is off by a little bit.\
Your EGR system blows exhaust, and nasty fumes into the intake plenum just behind the intake body (even though it is located on the back of the engine). Carbon just builds up there.

Last edited by trythis; 07-22-2006 at 11:44 AM.
trythis is offline   Reply With Quote
Old 07-22-2006, 02:25 PM   #8
Contributing Member
Personal Sales Rating: (0)
 
Snorkeldepth's Avatar
 
Join Date: Aug 2005
Location: Orange County, California
Posts: 590
I'm a little concerned about my throttle body. The throttle sticks every morning to the point that I have to break it loose. I had the TB thoroughly cleaned when I put the new engine in. I was suprised that it's still sticking. I've heard that a small groove can develop in the body that the flap gets stuck in. I think I recall that a bit of fine emery paper can do the trick to fix this. I wonder what all of this means as far as the TPS on my truck. How do you determine that the flap is closed "all the way?"
Snorkeldepth is offline   Reply With Quote
Old 07-22-2006, 07:52 PM   #9
Registered User
Personal Sales Rating: (0)
 
trythis's Avatar
 
Join Date: Jan 2006
Location: Kansas City
Posts: 669
I could tell that it wasnt all the way becasue I could close it more by hand that the springs could do alone. I could force it into the carbon guck, but I had ot spray it with TB cleaner and wipe it down. I dont see why a little LIGHT sanding would hurt except if you did it on the plenum, as metal bits might go into the intake.
trythis is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Joe's 1987 4Runner ladybugRC 86-95 Trucks & 4Runners (Build-Up Section) 206 05-24-2016 01:16 PM
battery light question Chicken12 95.5-2004 Tacomas & 96-2002 4Runners 6 10-14-2015 03:54 PM
Automatic Brake Reliability? (1986) Truckwithoutaname 86-95 Trucks & 4Runners 4 10-03-2015 03:41 PM
2 ecu's in one swap... Rerun 3.4 Swaps 2 10-01-2015 12:24 PM
Weird Tundra Issues beltcutter Newbie Tech Section 1 09-30-2015 06:14 AM


Tags
34l, adjustment, bad, camry, position, sensor, signs, symntom, sympthoms, symptom, symptoms, test, throttle, toyota, tps

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 10:24 AM.


2010 InternetBrands, Inc.