Page 2 of 2 FirstFirst 12
Results 11 to 20 of 20

Thread: Idle - isv, maf, tps, tb cleaned, readings .. what next!

  1. #11
    ⋆⋆ CF Donator ⋆⋆ Keyo's Avatar
    Join Date
    16th December 2018
    Location
    West Midlands
    Posts
    379
    Thanks for the replt Fend anything that saves the coppers is more then welcome as the VGI is still on .

  2. #12
    Enthusiast pfnsht's Avatar
    Join Date
    2nd February 2018
    Location
    Herts
    Posts
    333
    Okay managed to spend some time working through the list.

    1. MAF cleaned and tested with multi-meter - think it is okay - I'm seeing a reading fluctuating between 0.85v to 0.9v on idle. There is a perm 12v source to the MAF as well.

    2. Took of TPS and sprayed electrical contact cleaner on it.

    3. Carried out ECU reset procedure and read the basic settings, after driving it is a little better on idle.

    4. Took all my vacuum lines off, inc. carbon canister and inspected carefully for cracks. No problems there.

    5. Plugged in my OBD11 device and monitored the live readouts (there are no engine fault codes):

    - I found my idle speed sits mostly at 680 rpm but drops to 640 and up to 720 rpm every couple of seconds.

    - Coolant temp is good - steady 87 degrees

    - Lambda value fluctuates around 1.0 which I think it normal.

    Things I am not sure about:

    - Injector timing is 3.3 to 3.7ms. I've seen references it should be around 1.5ms reading around forums?

    - The EGR temp jumps between 182 degrees to 217 degrees centigrade every 1 second (I didn't think I had an EGR valve and maybe this is coming from the O2 sensor?)

    - The timing should be +-1 degree of 6.0. Mine jumps 4.5 to 6.8

    So I think maybe something is wrong, although it did get better following the ECU reset procedure. Just thinking out aloud

    - if the temps are coming from the o2 sensor perhaps it is over fuelling due to a bad injector, which probably points to why it's backing off the timing to 4.5 degrees every second too.

    - Motor mounts are worn and letting too much vibration through. If the numbers above look normally this could be a possibility.

    Any other ideas

    Thanks,
    Matt
    Last edited by pfnsht; 10th February 2019 at 3:49 PM.
    1995 White VR6 CCGB Member 4303

  3. #13
    ⋆⋆ CF Donator ⋆⋆ Keyo's Avatar
    Join Date
    16th December 2018
    Location
    West Midlands
    Posts
    379
    Quote Originally Posted by pfnsht View Post
    Okay managed to spend some time working through the list.

    1. MAF cleaned and tested with multi-meter - think it is okay - I'm seeing a reading fluctuating between 0.85v to 0.9v on idle. There is a perm 12v source to the MAF as well.

    2. Took of TPS and sprayed electrical contact cleaner on it.

    3. Carried out ECU reset procedure and read the basic settings, after driving it is a little better on idle.

    4. Took all my vacuum lines off, inc. carbon canister and inspected carefully for cracks. No problems there.

    5. Plugged in my OBD11 device and monitored the live readouts (there are no engine fault codes):

    - I found my idle speed sits mostly at 680 rpm but drops to 640 and up to 720 rpm every couple of seconds.

    - Coolant temp is good - steady 87 degrees



    - Lambda value fluctuates around 1.0 which I think it normal.

    Things I am not sure about:

    - Injector timing is 3.3 to 3.7ms. I've seen references it should be around 1.5ms reading around forums?

    - The EGR temp jumps between 182 degrees to 217 degrees centigrade every 1 second (I didn't think I had an EGR valve and maybe this is coming from the O2 sensor?)

    - The timing should be +-1 degree of 6.0. Mine jumps 4.5 to 6.8

    So I think maybe something is wrong, although it did get better following the ECU reset procedure. Just thinking out aloud

    - if the temps are coming from the o2 sensor perhaps it is over fuelling due to a bad injector, which probably points to why it's backing off the timing to 4.5 degrees every second too.

    - Motor mounts are worn and letting too much vibration through. If the numbers above look normally this could be a possibility.

    Any other ideas

    Thanks,
    Matt
    Have you tried a good old bit of injector cleaner like redex or something like that and give it a good run between 4.5 and 5 revs for a few minutes , you never know .

    Also can you get someone to rev the engine have a look under the car at the exhaust where it meeets the catalytic and see if there is any smoke leaks around that area. Just saying that because had those symptons what you have mentioned and today I noticed a smoke leak where the exhaust meets the cat area, and after the last couple of months checking VAG fault codes every other day it finally threw up code 00537 Oxygen sensor regulation sporadic and 00561 mixture which I expected as the cat and O2 sensor have never been changed. The O2 sensor apparently dont show a fault unless they are totally bad.

    Thankfully I have these ready to fit .

    EEC Catalatic (British made)with fixing kit

    https://www.ebay.co.uk/itm/Fits-VW-C...72.m2749.l2649

    Bosch O2 sensor for late model VR6

    https://www.ebay.co.uk/itm/BOSCH-Lam...72.m2749.l2649


    Solennoid charcoal vavle just incase is stcking open (second hand new ones are £120 plus wow !!!)

    https://www.ebay.co.uk/itm/BOSCH-028...72.m2749.l2649
    Last edited by Keyo; 10th February 2019 at 4:38 PM.

  4. #14
    Enthusiast pfnsht's Avatar
    Join Date
    2nd February 2018
    Location
    Herts
    Posts
    333
    Thanks for links Keyo I believe I do have a very minor exhaust leak up front, notice it once the engine is warmed up. Planning a stainless system for it at some point so quietly ignoring the problem at the mo!

    I've tried the injector cleaner but I suppose a more concentrated mixture wouldn't hurt.
    1995 White VR6 CCGB Member 4303

  5. #15
    ⋆⋆ CF Donator ⋆⋆ Keyo's Avatar
    Join Date
    16th December 2018
    Location
    West Midlands
    Posts
    379
    A leaky exhaust and bad lambada = rough running engine bad mixture.I could see the heat gasses escaping from the cat on mine to today quite prolific so I reckon that could give the sensor a crooked reading could be wrong though.

    Found these guys really sound and the cheapest for Milltek Catback.

    https://www.milltekexhaust-roadrunnermotorsport.co.uk/

    Just to add might aswell do the down pipe if doing the rest of the exhaust system, can get one for £65 with gasket and bolts from BM catalsyt (British Manufacture) it would be rude not to.

    I had a good look at the EEC Cat earlier and it seems well made also the Bosch sensor screws into the housing spot on.
    Last edited by Keyo; 10th February 2019 at 8:22 PM.

  6. #16
    ⋆⋆ CF Member ⋆⋆ Jim Bowen's Avatar
    Join Date
    16th May 2005
    Location
    Essex
    Posts
    8,960
    Does it change with any electrics on? Like hazards and full beam? I had an issue not long ago where the revs would pulse with the hazards and change the revs when full beam was on. Was my alternator needed servicing
    Just like a golf................But better!!!

  7. #17
    Enthusiast pfnsht's Avatar
    Join Date
    2nd February 2018
    Location
    Herts
    Posts
    333
    CHeers Jim. Oddly the car seems to be behaving much better most of the time since the work (mostly just cleaning).

    I did have a go at popping all the electrics on and idle seems fine.

    I think i am left the characteristic very very very slight lumpy idle.

    I’ve got some injector cleaner to run through but if it remains as is I’ll be happy.
    1995 White VR6 CCGB Member 4303

  8. #18
    Enthusiast pfnsht's Avatar
    Join Date
    2nd February 2018
    Location
    Herts
    Posts
    333
    Installed the JP MAF today (cheers Keyo for link) and it continues to idle perfectly. It did after cleaning the Bosch one to be honest but had already purchased a replacement.

    Also notice no surging while cruising (this was very subtle) and it's less snappy on off throttle. Win!

    On to the next job.
    1995 White VR6 CCGB Member 4303

  9. #19
    ⋆⋆ CF Donator ⋆⋆ Keyo's Avatar
    Join Date
    16th December 2018
    Location
    West Midlands
    Posts
    379
    Glad to here it mate sounds like your motor is in good hands, I put my old Bosch Sensor in the JP box. always good to have a spare with parts getting thin on the ground.

    Today I tested a used EVAC solenoid purge vavle I purchased off ebay described as tested. Put the inlet end of the solenoid on a manual Vacum pump up to 15 pressure and it held, thought great it works but once connected power it clicked but didnt release the pressure so epic fail as solenoid must be stuck, got a refund thankfully but had to fork out just over a ton for a new one .
    Last edited by Keyo; 17th February 2019 at 9:53 PM.

  10. #20
    Enthusiast pfnsht's Avatar
    Join Date
    2nd February 2018
    Location
    Herts
    Posts
    333
    Ouch!

    Yes i did the same and popped the box on my "spares" shelf!
    1995 White VR6 CCGB Member 4303

Similar Threads

  1. Disconnecting battery when car not in use?
    By Jim Bowen in forum Engine Bay
    Replies: 13
    Last Post: 2nd April 2016, 8:41 AM
  2. Disconnecting ABS ECU?
    By Jim Bowen in forum Drivetrain
    Replies: 17
    Last Post: 12th March 2013, 9:08 PM
  3. Disconnecting ECU for welding?
    By Jim Bowen in forum General Car Chat
    Replies: 4
    Last Post: 18th October 2012, 11:19 AM
  4. Replies: 6
    Last Post: 15th January 2012, 10:57 PM
  5. Disconnecting the MAF (Now a G62 Problem)?
    By VRTrickster in forum Engine Bay
    Replies: 5
    Last Post: 5th October 2009, 7:09 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
We are the world's largest community for VW's Super Coupé! Be it 8v, 16v, G60 or VR6 (or maybe something else!), everybody's welcome! If this is your first visit, be sure to click register and fill out your details before you can post.
Help us
This site is run on donations.
Please help keep the forum alive!
Follow us
advertising & sponsorship
Are you a company looking for advertising that could benefits our users? For site & forum sponsorship, please see our dedicated microsite here.