Bad TPS? RB25 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

2.5T_/<ouki · 09-04-2012, 10:11 PM

Checked my TPS with a MM and going off the readings and a lil write up on skylineaus.com it appears my TPS is bad?

Key On / Engine Off

5v wire reads 5.15v
Signal wire @ WOT reads 4.47v
Signal wire @ Closed reads .62v

The write up on skyline aus stated if I'm receiving my 5v from 5v wire and NOT getting 4.5v @ WOT my TPS is bad. Can someone confirm this?

Car bogs and sputters horribly, shuts off at red lights/stop signs, idles a bit rough. Also when the sputters happens I'm @ like 2k rpm then without hitting the gas the engine will rev all the way to 5k by itself then drop back down.

PrimeDirective · 09-04-2012, 10:53 PM

So, I have to wonder if this is related to this post you started but never followed up on.
http://zilvia.net/f/tech-talk/471610...eps-dying.html

What ever happened from this? If you stick with ONE post people might be able to help you.

You say your self that you should be getting 4.5V at WOT and you get 4.47V. That's 4.5V as far as I'm concerned.

You should be around 4.5V at WOT. You could of burned a contact point somewhere between closed and WOT and the TPS could still be your problem. Unless you can get your hands on an oscilloscope to monitor the voltage over the range of the throttle, try replacing the TPS with one of your friend's.

Also, quit abandoning threads and starting new ones. Follow through with updates for everyone else who might be having the same problem as you.

2.5T_/<ouki · 09-04-2012, 11:50 PM

I have no idea what the problems are man. This is diff from last time or I would continue to update the threads. Spark plug gaps seemed to be causing the sputtering and dying last time. That has been corrected and car has been running pretty good up until about 3 days ago.

I'm at .62 closed when supposed to be at .5

bkt808 · 09-05-2012, 02:08 AM

try adjusting it

PoorMans180SX · 09-05-2012, 10:15 AM

You can unplug the TPS and the car should still run and drive. That's the beauty of MAF cars.

I think it might be more of an IACV issue though.

2.5T_/<ouki · 09-05-2012, 11:39 AM

Quote:

Originally Posted by bkt808

try adjusting it

I possibly can adjust it however it's not loose or anything along those lines nor has I given problems before. If I never touched it and it now reads too high at closed (.62v) wouldn't it be bad?

PrimeDirective · 09-05-2012, 12:06 PM

.62 V is only a little high. It wouldn't cause the problems you are having. If anything the car would just idle a bit high. Is the throttle body actually all the way closed?

MrSanchez925 · 09-05-2012, 12:21 PM

Quote:

Originally Posted by PoorMans180SX

You can unplug the TPS and the car should still run and drive. That's the beauty of MAF cars.

I think it might be more of an IACV issue though.

Not true. Unplugging the TPS will keep your car from driving.

either way to the OP

Your .62 at idle is high. and it needs to be adjusted.

as well as you 4.47v at WOT is lowish but won't hinder your performance or drivability.

But being since you can get it to be even at Idle and WOT your TPS is probably bad.

You should be able to adjust it to be almost near perfect. IE .45vidle - 4.5vWOT.,

have you tried cleaning the connections?

MrSanchez925 · 09-05-2012, 12:22 PM

Quote:

Originally Posted by 2.5T_/<ouki

I possibly can adjust it however it's not loose or anything along those lines nor has I given problems before. If I never touched it and it now reads too high at closed (.62v) wouldn't it be bad?

TPS can go out of synch over long periods of time, carbon build up , being bumped around during shipping, ect.

try adjusting it. if that fails then replace it.

2.5T_/<ouki · 09-05-2012, 09:28 PM

I've noticed that this only happens after the engine has warmed up a good amount. Could it be due to the MAF getting so damn hot?

MrSanchez925 · 09-05-2012, 09:31 PM

possibly,
Have you tried pulling for trouble codes yet?

2.5T_/<ouki · 09-05-2012, 10:16 PM

Quote:

Originally Posted by MrSanchez925

possibly,
Have you tried pulling for trouble codes yet?

Yes I have actually, came up with 55. I'm stumped!!

Appreciate the help guys! Keep the suggestions coming.

MrSanchez925 · 09-05-2012, 10:19 PM

adjust the TPS, and try swapping out for a Known good maf.

2.5T_/<ouki · 09-06-2012, 10:32 PM

I dont know anyone with a MAF I could try lol.

2.5T_/<ouki · 09-10-2012, 12:20 AM

FIXED!!!!

Turns out it was the MAF. Had to open it up and check out what was up. Turns out the solder had come off some of the pins inside the MAF. Re-soldered and everything is tip top!!! (So far)

Thanks for all the help guys!

DJDANGER24 · 09-10-2012, 01:18 AM

Good to hear you got it fixed, damn MAFS are always a problem it seems lol Go with a MAP sensor now

09-04-2012, 10:11 PM	#1
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	Bad TPS? RB25 Checked my TPS with a MM and going off the readings and a lil write up on skylineaus.com it appears my TPS is bad? Key On / Engine Off 5v wire reads 5.15v Signal wire @ WOT reads 4.47v Signal wire @ Closed reads .62v The write up on skyline aus stated if I'm receiving my 5v from 5v wire and NOT getting 4.5v @ WOT my TPS is bad. Can someone confirm this? Car bogs and sputters horribly, shuts off at red lights/stop signs, idles a bit rough. Also when the sputters happens I'm @ like 2k rpm then without hitting the gas the engine will rev all the way to 5k by itself then drop back down.

09-05-2012, 10:15 AM	#5
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 37 Posts: 5,616 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	You can unplug the TPS and the car should still run and drive. That's the beauty of MAF cars. I think it might be more of an IACV issue though. __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.

09-10-2012, 01:18 AM	#16
DJDANGER24 Nissanaholic! Join Date: Jun 2007 Location: San Diego (Fletcher Hills), CA Age: 40 Posts: 2,474 Trader Rating: (10) Feedback Score: 10 reviews	Good to hear you got it fixed, damn MAFS are always a problem it seems lol Go with a MAP sensor now __________________ Built RB25 - RB The World - Vertex Everything @RBVertexRidge

09-04-2012, 10:53 PM	#2
PrimeDirective Zilvia Member Join Date: Jan 2012 Location: Olympia WA Age: 37 Posts: 266 Trader Rating: (3) Feedback Score: 3 reviews	So, I have to wonder if this is related to this post you started but never followed up on. http://zilvia.net/f/tech-talk/471610...eps-dying.html What ever happened from this? If you stick with ONE post people might be able to help you. You say your self that you should be getting 4.5V at WOT and you get 4.47V. That's 4.5V as far as I'm concerned. You should be around 4.5V at WOT. You could of burned a contact point somewhere between closed and WOT and the TPS could still be your problem. Unless you can get your hands on an oscilloscope to monitor the voltage over the range of the throttle, try replacing the TPS with one of your friend's. Also, quit abandoning threads and starting new ones. Follow through with updates for everyone else who might be having the same problem as you.

09-04-2012, 11:50 PM	#3
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	I have no idea what the problems are man. This is diff from last time or I would continue to update the threads. Spark plug gaps seemed to be causing the sputtering and dying last time. That has been corrected and car has been running pretty good up until about 3 days ago. I'm at .62 closed when supposed to be at .5

09-05-2012, 02:08 AM	#4
bkt808 Zilvia Member Join Date: Feb 2010 Location: Wailuku, Maui, Hawaii Age: 37 Posts: 245 Trader Rating: (1) Feedback Score: 1 reviews	try adjusting it

09-05-2012, 12:06 PM	#7
PrimeDirective Zilvia Member Join Date: Jan 2012 Location: Olympia WA Age: 37 Posts: 266 Trader Rating: (3) Feedback Score: 3 reviews	.62 V is only a little high. It wouldn't cause the problems you are having. If anything the car would just idle a bit high. Is the throttle body actually all the way closed?

09-05-2012, 09:28 PM	#10
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	I've noticed that this only happens after the engine has warmed up a good amount. Could it be due to the MAF getting so damn hot?

09-05-2012, 09:31 PM	#11
MrSanchez925 Zilvia Junkie Join Date: Feb 2012 Location: Martinez, Ca Age: 36 Posts: 412 Trader Rating: (4) Feedback Score: 4 reviews	possibly, Have you tried pulling for trouble codes yet?

09-05-2012, 10:19 PM	#13
MrSanchez925 Zilvia Junkie Join Date: Feb 2012 Location: Martinez, Ca Age: 36 Posts: 412 Trader Rating: (4) Feedback Score: 4 reviews	adjust the TPS, and try swapping out for a Known good maf.

09-06-2012, 10:32 PM	#14
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	I dont know anyone with a MAF I could try lol.

09-10-2012, 12:20 AM	#15
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	FIXED!!!! Turns out it was the MAF. Had to open it up and check out what was up. Turns out the solder had come off some of the pins inside the MAF. Re-soldered and everything is tip top!!! (So far) Thanks for all the help guys!