www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You




Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Reply
 
Thread Tools
Old June 13th, 2018, 05:23   #1
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default 2002 vw jetta tdi rpm varies while about 100 rpm

Hello every one I am new to this forum, i am having little issue with my tdi, rpm varies up/down 100rpm while coasting down the road and i can feel the car pull little bit, i changed the duel filter, i changed the MAF, and right now I am not sure what to look for next, any help would be appreciated thanks,
Suadwa is offline   Reply With Quote
Old June 13th, 2018, 06:06   #2
jmodge
Veteran Member
 
Join Date: Jun 2015
Location: Greenville, MI
Default

Sounds like at idle? Check your temp sensor with VCDS. I had a slight hunt at idle with a bad sensor before
__________________
The more I find to learn, I find there's more to learn
jmodge is offline   Reply With Quote
Old June 13th, 2018, 06:37   #3
jokila
 
jokila's Avatar
 
Join Date: Dec 2004
Location: Houston, Texas
Fuel Economy: 52/45/40
Default

Manual or auto?
__________________
Ventecomy | Heated seat lighted switch | W8 light |
Blue tint aspherical tinted mirrors | Turn signal convenience | Euro Light Switch | Rear Fog Light | DrawTite Hitch | HIDs | 520 injectors | Engine Cover mod light |
VCDS-HEX/CAN & VagTacho available Houston metro area.
jokila is offline   Reply With Quote
Old June 13th, 2018, 17:34   #4
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default

It idles perfect, just when driving at any speed, it will start to move up and down

Car is automatic
Suadwa is offline   Reply With Quote
Old June 13th, 2018, 18:09   #5
flee
Veteran Member
 
Join Date: Sep 2011
Location: Chatsworth, CA
Fuel Economy: 40-ish
Default

This could be transmission related, maybe the torque converter locking in and out.
I have noticed this mostly under load on a failing 01M trans.
When and how often was the trans fluid changed?
__________________
2002 Jetta GLS TDI wagon, 2012 Audi A3 TDI S-Line
flee is offline   Reply With Quote
Old June 13th, 2018, 18:10   #6
STDOUBT
Veteran Member
 
STDOUBT's Avatar
 
Join Date: Jul 2007
Location: Portland, effing Oregon
Default

You say you can feel the car pull a little bit. This is without pushing down the go pedal? I wonder if the engine is starting to sip on intercooler oil.
My first step would be to make sure the intercooler piping is clear of puddles....
__________________
2003 Jetta TDI 1.9L 5-speed
All Stock except: Ventectomy
STDOUBT is online now   Reply With Quote
Old June 13th, 2018, 18:46   #7
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default

It only happends when i hold steady speed or if i cruise it. I am not sure when transmission oil was changed as I just got the car few weeks ago.
how do I check if there is oil in the intercooler?

I have a video is there a way I can post it somewhere?
Suadwa is offline   Reply With Quote
Old June 13th, 2018, 21:11   #8
STDOUBT
Veteran Member
 
STDOUBT's Avatar
 
Join Date: Jul 2007
Location: Portland, effing Oregon
Default

Mileage?
For the 01M, you for sure want to keep the gear oil as fresh as possible.
A lot of people recommend installing a cooler on that tranny to prolong its life. Tons of info about the 01M here.
Most people link youtube to demo stuff here.
There's also a ton of intercooler videos on youtube. Just search ALH intercooler.
__________________
2003 Jetta TDI 1.9L 5-speed
All Stock except: Ventectomy
STDOUBT is online now   Reply With Quote
Old June 13th, 2018, 21:59   #9
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default

Car has 132k miles, transmission shift great, i will be checking intercooler tomorrow for oil, i only have check engine light for glow plugs which is my next project but as it looks like it's harrness.
Suadwa is offline   Reply With Quote
Old June 14th, 2018, 05:10   #10
Powder Hound
Veteran Member
 
Powder Hound's Avatar
 
Join Date: Oct 1999
Location: Conkud, New Hampshiyuh, USA
Fuel Economy: pretty freakin' good.
Default

Do a search on Coolairvw's threads on the 01M transaxle. It will help you figure the unit out. You'll also need a VCDS to do proper diagnosis, but on the surface, it sounds like your valve body needs help.


Go read those threads and do some thinking, and testing. At least, what you can do. If you can find someone with a VCDS who is willing to help you out, or if you can go buy your own (see the Ross-Tech website) then by all means, DO IT!


Good luck,


PH
__________________
You always pay for what you get. Sometimes you get what you pay for.
It is called dope because it does make you dumb.
Thinking outside the box is difficult for some. They're afraid they'll fall off the edge of the box and be lost to oblivion.
Powder Hound is offline   Reply With Quote
Old June 14th, 2018, 08:56   #11
flee
Veteran Member
 
Join Date: Sep 2011
Location: Chatsworth, CA
Fuel Economy: 40-ish
Default

Quote:
Originally Posted by Suadwa View Post
It only happends when i hold steady speed or if i cruise it. I am not sure when transmission oil was changed as I just got the car few weeks ago.
how do I check if there is oil in the intercooler?
I have a video is there a way I can post it somewhere?
What you describe is exactly the way my 01M was acting.
It was the TCC failing to hold. Eventually it did throw a CEL.
A fluid change helped a little bit but did not solve the problem.
__________________
2002 Jetta GLS TDI wagon, 2012 Audi A3 TDI S-Line
flee is offline   Reply With Quote
Old June 14th, 2018, 17:05   #12
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default

I was suspecting valve body from online what I was reading, i am going to try changing oil in tranny, see how it goes, have any body tried valve bodies from ebay
Suadwa is offline   Reply With Quote
Old June 14th, 2018, 18:12   #13
Powder Hound
Veteran Member
 
Powder Hound's Avatar
 
Join Date: Oct 1999
Location: Conkud, New Hampshiyuh, USA
Fuel Economy: pretty freakin' good.
Default

a valve body from ebay - hmmm.... check my sig. Ebay would be good for some kinds of bling or other peripheral stuff, but for a valve body in the transaxle, I think it would be a better idea to go to someone like coolairvw who will stand behind his product and with whom you have an outstanding chance of getting things going again.


I just don't know about what I'd be getting off ebay.


How risk adverse are you?


Cheers,


PH
__________________
You always pay for what you get. Sometimes you get what you pay for.
It is called dope because it does make you dumb.
Thinking outside the box is difficult for some. They're afraid they'll fall off the edge of the box and be lost to oblivion.
Powder Hound is offline   Reply With Quote
Old June 14th, 2018, 18:18   #14
KyleMillione
Veteran Member
 
Join Date: Jan 2017
Location: Yaphank, New York
Fuel Economy: 02 (auto) 39, 03 (man) 48
Default

Your valve body is probably toast. Id check how burnt the fluid is before spending $ on a valve body, if it's black, your probably sunk. Also, time is of the essence, the more you drive it surging, the more your abusing the TCC. I have had this one (https://www.ebay.com/itm/361599208451?ul_noapp=true) in my car now for about 30k, and it seems to be holding up. I agree that coolairvw is the guru on these things, but couldn't justify spending real money, because if it didn't work it was getting replaced with a working unit harvested from a car I crashed. Theres a lot of things that makes these "rand-o-fail" transmissions upset, I find that the normal fill procedure leaves it about 1/2 qt low. Also, tire pressure greatly effects shift quality, if one tire has more air it will bang into gear. If you have VCDS I recommend turning off the DSP and coding it into sport mode. If I was in your position and the fluid isn't black, id put that valve body in, fill it with maxlife atf (I've had good results with it), recode it, and see if it learns.
__________________
2002 Green Jetta Auto 220k RIP
2002 Black Jetta Auto 240k
2003 Silver Jetta 5sp 290k

Last edited by KyleMillione; June 14th, 2018 at 18:27. Reason: Added link
KyleMillione is offline   Reply With Quote
Old June 14th, 2018, 22:52   #15
Suadwa
Newbie
 
Join Date: Jun 2018
Location: Spokane wa
Default

I also noticed today when I was driving that when rpm is jumping and i push really good on gas and let go rpm stays like at 2000 but when it's working properly and i push on the gas and let go rpm falls back down to idle
Suadwa is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2002 TDI Jetta RPM Jumping SilverTurtle TDI 101 6 February 15th, 2014 19:57
dramatic Power loss when pushed above 2,000 rpm 2002 Jetta TDI Boondoggle VW MKIV-A4 TDIs (VE and PD) 6 January 28th, 2014 17:58
PD TDI Vibration @2000 rpm and 3500 rpm+ eparker202 VW MKIV-A4 TDIs (VE and PD) 8 December 10th, 2012 19:33
2002 jetta tdi manual double check at low RPM's when stepping on throttle! rhinotalon VW MKIV-A4 TDIs (VE and PD) 0 June 28th, 2011 14:08
RPM power range for a 90hp 2002 jetta tdi no mods 2002tdijetta TDI 101 2 June 22nd, 2005 11:26


All times are GMT -7. The time now is 16:39.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.13251 seconds with 13 queries
[Output: 125.24 Kb. compressed to 104.14 Kb. by saving 21.10 Kb. (16.85%)]