TPS Adjustment 101 - RX7Club.com - Mazda RX7 Forum

2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

TPS Adjustment 101

Reply

 
 
 
Old 10-23-03, 08:36 AM
  #1  
Eats, Sleeps, Dreams Rotary
Thread Starter
iTrader: (1)
 
Turbonut's Avatar
 
Join Date: Feb 2002
Location: NJ
Posts: 3,665
Thanks: 0
Thanked 2 Times in 2 Posts
TPS Adjustment 101

Setting TPS:
Key on-Intially set the narrow range (adjustment screw) .75-1.25 , wide (no adjustment) .25-1.25
Then hook up meter to Check Connector (Positive lead into single, Negative lead alternately into each of the other 2 pins) and adjust until value in only one combination. If both have value, or neither register any volts, adjust accordingly. I assume you could use 2 meters, but my other meter was down at the house, so I didn't experiment.
Results:
'89TII-After playing around with a performance/idle (TPS & BAC) issue thought I would post findings.
After fixing BAC, routine cleaning, resistance, voltage, and TPS adj. to .99 volts, car idled somewhat better, but experienced a detonation in second gear @ 1/2 throttle. Back to garage to replace the TPS. Installed new, even though used, TPS and set narrow to .97, wide range .65. Took the car out for a test. Idle was still high @900/1000 and not as smooth as I would like, but not lumpy, or missing. On way home in fouth, accelerated and had 2 quick detonations @ 3/4 throttle. Once home checked TPS and still the same .99 and .65. I then hooked up meter to Green Check Connector.(Pos lead in single, Neg in each side of double, alternately) and found 10+ volts in each. Meaning both lights on Mazda tester would be on. With meter attached to Check Connector, I began turning TPS adjustment screw clockwise. After about 4 turns, the meter dropped to zero. I checked the other side and it had 10 volts. Tightened everything down, went for ride, idle down to 700/800 and as smooth as could be. A couple of performance test showed no problems.
Turbonut is offline  
Reply With Quote
Old 10-23-03, 02:46 PM
  #2  
I R SAD PANDA W/O BAW
10 Year Member
 
ilike2eatricers's Avatar
 
Join Date: Nov 2002
Location: bay area
Posts: 6,061
Thanks: 0
Thanked 0 Times in 0 Posts
good write up.
ilike2eatricers is offline  
Reply With Quote
Old 10-23-03, 02:54 PM
  #3  
wet drifting dream
5 Year Member
 
Red 86 rx-7's Avatar
 
Join Date: Sep 2003
Location: Earth
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
How can I apply your TPS fix to my 86fc n/a?
Red 86 rx-7 is offline  
Reply With Quote
Old 10-23-03, 03:22 PM
  #4  
Engine, Not Motor
iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,663
Thanks: 0
Thanked 19 Times in 19 Posts
If you need 4 turns of the TPS screw to adjust things "properly", then there's something else seriously wrong. The proper procedure is below:

Adjusting the TPS is a simple maintenance item that should be preformed at any oil change. The benefits include better gas mileage, better performance and a smoother idle. Adjustment only takes a few minutes if you follow the directions below.

What You Need
∑ Ohmmeter
∑ Flathead Screwdriver
∑ Half an hour

How To Adjust
∑ Warm the car completely by driving for 20 minutes
∑ If your car is a turbo, remove the intercooler. Loosen the hose clamps on the inlet and outlet, remove the vacuum line, and then remove the four bolts (I believe 11 or 12MM). Lift off the cooler. Do this quickly so the car does not cool.
∑ Unplug the TPS. On 89+ cars, you want to unplug the connector leading from the lower TPS.
∑ Hold the TPS connector so the hump points up. Connect your meter between top connection and rightmost connection.
∑ Adjust the stop screw until the meter reads 1K (1000 Ohms)
∑ Plug the TPS back in
∑ If necessary, reinstall the intercooler. Donít overtighten the hose clamps
∑ Drive the car for a few minutes, then repeat the procedure

Last edited by Aaron Cake; 04-08-04 at 03:58 PM.
Aaron Cake is offline  
Reply With Quote
Old 10-23-03, 04:02 PM
  #5  
Eats, Sleeps, Dreams Rotary
Thread Starter
iTrader: (1)
 
Turbonut's Avatar
 
Join Date: Feb 2002
Location: NJ
Posts: 3,665
Thanks: 0
Thanked 2 Times in 2 Posts
Well Aaron, I couldn't even remove the intercooler with a 10 mm socket (couldn't resist) and also why deviate from Mazda tester?
This procedure seems similar to adjusting narrow to 1.0 volts and leaving it at that point. You're allowing no compensation for wide variation. Four turns may be quite a bit in your estimation, but the car is perfect, and it only increased the volts to 1.27.
Turbonut is offline  
Reply With Quote
Old 10-23-03, 04:46 PM
  #6  
Eats, Sleeps, Dreams Rotary
Thread Starter
iTrader: (1)
 
Turbonut's Avatar
 
Join Date: Feb 2002
Location: NJ
Posts: 3,665
Thanks: 0
Thanked 2 Times in 2 Posts
Just got home from work and wanted to explain. I wanted to emulate the Mazda FSM and post for all who wanted to adjust the TPS in this manner, which may be easier for some. If others desire to use the resistance method, so be it.
Sorry I posted it!
Turbonut is offline  
Reply With Quote
Old 10-23-03, 04:50 PM
  #7  
Senior Member
10 Year Member
 
Join Date: Nov 2001
Location: chillicothe, OH
Posts: 380
Thanks: 0
Thanked 0 Times in 0 Posts
what if my car doesn't hold the correct voltage? when i get it set correctly as soon as i get back from a drive it's out of whack again. is there any way to fix it or do i have to buy another one?
*a*jones* is offline  
Reply With Quote
Old 10-23-03, 05:05 PM
  #8  
wet drifting dream
5 Year Member
 
Red 86 rx-7's Avatar
 
Join Date: Sep 2003
Location: Earth
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
Some posts In my search say to connect two LED's to a three prong coupler...1 red light 1 green...you want only one LED to light up.. Also ad a jumper wire to some other coupler near the front coil pack?????
Red 86 rx-7 is offline  
Reply With Quote
Old 10-23-03, 05:08 PM
  #9  
Old School Rotors
5 Year Member
 
RoninAutoBoX's Avatar
 
Join Date: Jul 2003
Location: South Florida
Posts: 883
Thanks: 0
Thanked 0 Times in 0 Posts
The jumper wire near the front coil pack is to check for ECU error codes I believe. That is only if you get a check engine light.
RoninAutoBoX is offline  
Reply With Quote
Old 10-23-03, 05:37 PM
  #10  
wet drifting dream
5 Year Member
 
Red 86 rx-7's Avatar
 
Join Date: Sep 2003
Location: Earth
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
I have the two LED test setup for my car My question is should the engine be off or running? 1 light when adjusted right? Sorry I only have 1 multi meter..I noticed when I have the car off Both lights are on...When I start the engine only one is lit when running...Also should I be using LED's with a built in resistor????
Red 86 rx-7 is offline  
Reply With Quote
Old 10-23-03, 06:10 PM
  #11  
Senior Member
5 Year Member
 
NA_VersionFC3S's Avatar
 
Join Date: Nov 2002
Location: Bay Area
Posts: 402
Thanks: 0
Thanked 0 Times in 0 Posts
The car should be off when doing the test. You notice how one of the steps is to remove the intercoller (if you have a TII). So obviously the car should be off.

Tim
NA_VersionFC3S is offline  
Reply With Quote
Old 10-23-03, 10:23 PM
  #12  
Lives on the Forum
10 Year Member
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Thanks: 0
Thanked 2 Times in 2 Posts
Originally posted by Turbonut
Just got home from work and wanted to explain. I wanted to emulate the Mazda FSM and post for all who wanted to adjust the TPS in this manner, which may be easier for some. If others desire to use the resistance method, so be it.
Sorry I posted it!
1) Cause the stupid Mazda test procedure doesn't look for "dead spots" in the TPS travel, which could cause hesitations at any RPM.
2) Cause the stupid Mazda test procedure doesn't look for "overly high resistance" at full open, which could cause high RPM hesitations.
3) Cause it's a stupid Mazda test...


-Ted
RETed is offline  
Reply With Quote
Old 10-24-03, 07:34 AM
  #13  
Eats, Sleeps, Dreams Rotary
Thread Starter
iTrader: (1)
 
Turbonut's Avatar
 
Join Date: Feb 2002
Location: NJ
Posts: 3,665
Thanks: 0
Thanked 2 Times in 2 Posts
Your opinion, but if the TPS is bad it will not work properly even after you set to the correct resistance. Is this not correct?
Naturally you need to check the TPS through it's travel if problems persist after initial setting.
At least if I'm having a problem, I can check Green Check Connector without removing the intercooler etc.
Had car out last night, pulled strong as ever, right up to 6500 and 9.5 lbs boost. Felt great. Dave at KD hit the problem right on the nose. He had said the TPS was all over the place after USING THE MAZDA TESTER and he, as usual, was right.
My opinion.
Turbonut is offline  
Reply With Quote
Old 10-24-03, 07:38 PM
  #14  
Lives on the Forum
10 Year Member
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Thanks: 0
Thanked 2 Times in 2 Posts
Originally posted by Turbonut
Your opinion, but if the TPS is bad it will not work properly even after you set to the correct resistance. Is this not correct?
But when I check idle, WOT, and progressive opening, that eliminates almost all problems that could be associated with the TPS. If it clears all those tests, I would look elsewhere if you're running into problems. Care to show me how using a pair of lights and/or looking at voltage?


Naturally you need to check the TPS through it's travel if problems persist after initial setting.
Sure, but how do you do that with a pair of lights?


At least if I'm having a problem, I can check Green Check Connector without removing the intercooler etc.
Sure, but I can also remove my intercooler in 5 minutes, and that's not a big deal for me. You can run a telltale on a boost gauge while on the track, but that only tells you what your max boost was - wouldn't a full datalog of your boost levels be a much useful tool? It's a matter of relativity - just because it's good enough for you don't assume it's fine for others.


Had car out last night, pulled strong as ever, right up to 6500 and 9.5 lbs boost. Felt great. Dave at KD hit the problem right on the nose. He had said the TPS was all over the place after USING THE MAZDA TESTER and he, as usual, was right.
My opinion.
Anyone who has to resort to a MAZDA TESTER has a problem using a simple DMM - I would seriously worry about that...


-Ted
RETed is offline  
Reply With Quote
Old 10-26-03, 08:13 AM
  #15  
Full Member
5 Year Member
 
pistol's Avatar
 
Join Date: Apr 2003
Location: New Jersey
Posts: 159
Thanks: 0
Thanked 0 Times in 0 Posts
Turbonut Pm'd you.
pistol is offline  
Reply With Quote
Old 10-26-03, 10:07 AM
  #16  
HAILERS
10 Year Member
 
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Thanks: 0
Thanked 3 Times in 3 Posts
****what if my car doesn't hold the correct voltage? when i get it set correctly as soon as i get back from a drive it's out of whack again. is there any way to fix it or do i have to buy another one?******

The engine has to be HOT. Fully warmed up. If the tps is set.....then you go back to look again an hour later...the reading will not be the same. That's due to the thermowax moving the linkage. Always set the tps with a fully warmed up/hot engine and if your going to check it at a later time make sure the engine is fully hot/warmed up. If you don't the readings will be different. That is normal and to be expected.
HAILERS is offline  
Reply With Quote
Old 10-26-03, 12:02 PM
  #17  
Senior Member
5 Year Member
 
Templeswain's Avatar
 
Join Date: Apr 2003
Location: New Idaho
Posts: 523
Thanks: 0
Thanked 0 Times in 0 Posts
I just tried aarons' proceedure.

I have two tps sensors as he indicated for 89+ cars.

The wires that go from the lower tps are black/red
green/red and solid orange.

So I used the DMM, and I get 3000K-4000k. The car likes to idle high around 1200, to 1500.

Turning the screw only increases the resistence, but will not decrease it.....?

Crappy tps or am I doing this wrong?
Templeswain is offline  
Reply With Quote
Old 01-13-04, 04:06 PM
  #18  
just dont care.
iTrader: (6)
 
jacobcartmill's Avatar
 
Join Date: Jul 2002
Location: Nashville, TN
Posts: 9,386
Thanks: 0
Thanked 0 Times in 0 Posts
which TPS (narrow or widerange) do i set to 1.000 ohms?
jacobcartmill is offline  
Reply With Quote
Old 01-13-04, 06:55 PM
  #19  
Lives on the Forum
10 Year Member
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Thanks: 0
Thanked 2 Times in 2 Posts
Originally posted by jacobcartmill
which TPS (narrow or widerange) do i set to 1.000 ohms?
Narrow (black and green wires) and it's ONE THOUSAND ("1k") ohms.


-Ted
RETed is offline  
Reply With Quote
Old 01-13-04, 07:33 PM
  #20  
Full Member
5 Year Member
 
Join Date: Nov 2003
Location: North York, Ontario
Posts: 233
Thanks: 0
Thanked 0 Times in 0 Posts
Originally posted by *a*jones*
is there any way to fix it or do i have to buy another one?
last time i checked, it was worth about $260 CDN, so I'd use the resistance test and make sure that it is not working before dropping that much dough. I was able to find one at a wreckers for a couple bucks, but there's no guarantee it'll be in better shape than your previous one.
dubrc is offline  
Reply With Quote
Old 02-28-04, 04:31 PM
  #21  
Fight the Cancer
iTrader: (41)
 
Molotovman's Avatar
 
Join Date: Jul 2002
Location: Northern Virginia
Posts: 3,174
Thanked 23 Times in 19 Posts
What connector are we talking about, i dont understand how to do this locationwise.
Molotovman is offline  
Reply With Quote
Old 04-07-04, 08:39 PM
  #22  
Rotary Power Information
5 Year Member
 
Join Date: Aug 2003
Location: New Hampshire, Greenfield
Posts: 528
Thanks: 0
Thanked 0 Times in 0 Posts
ViperDude152 is offline  
Reply With Quote
Old 04-07-04, 09:01 PM
  #23  
Eats, Sleeps, Dreams Rotary
Thread Starter
iTrader: (1)
 
Turbonut's Avatar
 
Join Date: Feb 2002
Location: NJ
Posts: 3,665
Thanks: 0
Thanked 2 Times in 2 Posts
Above post decent except for the part if not 1k ohm replace the tps. The Mazda range is , don't quote me as I don't have the FSM handy, S5 .75/1.25k ohms as a starting point, then adjust the tps via Mazda check connector. In my experience starting at 1k ohms, or as some say 1 volt, then do the adjustment with the Mazda connector the best bet. Also with engine off and meter connected, run the tps through it's range and make certain no low points or spikes. Must be smooth.
Just a FYI-The tps can be adjusted with engine cold as long as the fast idle cam is disengaged. I use a screwdriver to hold it down as it is annoying to remove the intercooler and work on it at times when hot.
Turbonut is offline  
Reply With Quote
Old 04-08-04, 03:45 PM
  #24  
Engine, Not Motor
iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,663
Thanks: 0
Thanked 19 Times in 19 Posts
Originally posted by ViperDude152
another right up
http://www.racingrotary.com/tps.htm
That page scares me. The test lamp method SUCKS. The ONLY accurate way to set the TPS is via resistance.
Aaron Cake is offline  
Reply With Quote
Old 04-08-04, 03:56 PM
  #25  
JKM
 
JKM's Avatar
 
Join Date: Oct 2003
Location: Burlington, NC
Posts: 1,341
Thanks: 0
Thanked 0 Times in 0 Posts
I adjusted mine a few weeks ago following Aaron's procedure. After I finally got it set right, it made a WORLD of difference. Before I adjusted anything the resistance reading was 2k ohms
JKM is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: TPS Adjustment 101


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: