|
850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
Information |
|
Sooty Plugs, judder at low revsViews : 16195 Replies : 148Users Viewing This Thread : |
|
Thread Tools | Display Modes |
|
Dec 7th, 2007, 19:27 | #1 |
Premier Member
|
Sooty Plugs, judder at low revs
Hello all
I've been out to check the my new set of plugs and they are really sooty as per the last set. I presume it's running rich (better than the dreaded lean!!). When I boost at low revs the cars seems to give out a high frequency judder until 4KRPM then she takes off. What can cause rich running on these cars and what the best course of action ?? For your info,,,, It's had new plugs/dizzy/rotor/leads/fuel filter/air filter so far. Last year she had new PCV system/injectors/dump valve/blanking plate etc etc. I'm running out of money!!!
__________________
HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord' |
Dec 7th, 2007, 22:55 | #2 | |
Phoenix from the ashes
Last Online: Apr 24th, 2024 01:05
Join Date: Jan 2006
Location: Finchingfield
|
Quote:
what gap are you using, try 6mm.... juddering is sure sign of this, i expect you have a leak either at the lower i/c hose or at the throttle based on the fact that you sorted the inlet elbow when you did the pcv.... with the stock 7mm setting i too had overfueling issues which were sorted with the plug gap reduction.... ecu upgrades often run rich, try a mbc to counteract this.... IMO the shelf chips/remaps are set very safe and overfuel rather than underfuel....of course some custom remaps underfuel to prevent this!!..... cheers jod
__________________
Dum Spiro Spero VOC 20419 |
|
Dec 8th, 2007, 09:23 | #3 |
Junior Member
Last Online: Mar 21st, 2018 21:52
Join Date: Dec 2004
Location: frimley
|
how many pipes am i looking for re the boost leak is it the main one that runs'under' the block,or is there any more?? i had simlier probs this week,the old juddering trying to stall business,im sure its a boost leak but having checked it and rechecked it i cannot for the life of me find it,so do i just replace the elbows and the hose ??? can it run over top of the block or does it have to be re routed to where it was???
help!! |
Dec 8th, 2007, 10:43 | #4 | |
Phoenix from the ashes
Last Online: Apr 24th, 2024 01:05
Join Date: Jan 2006
Location: Finchingfield
|
Quote:
if there is not a good suck then it is likely either your elbow is split or your pipework has broken behind the inlet manifold..both eventualities means loss of boost... The solution is of course to redo the PCV system which may not be practical at the time so you cab rig a temporary feed using 4mm hose from the inlet manifold elbow (heat elbow in water first to expand) fixing it on with long nosed pliers, the elbows come with a fitting sleeve with goes inside your 4mm hose and can be secured with cable tie running the hose under the fuel rail, round the block, below the dizzy and onto the PCV valve nipple... Pipes to change.... Inlet to Pcv... compressor to BCS actuator to BCS Inlet manifold to recirc-valve Intet manifold to EVAP...would be a good start..... Give your actuator arm a good tug to make sure its working ok...a weak spring will lose your boost...try moving the arm back and forth towards the turbo.....you may want to fit a MBC to test the arms efficiency.... cheers jod
__________________
Dum Spiro Spero VOC 20419 |
|
Dec 8th, 2007, 13:26 | #5 |
Premier Member
|
Cheers Jod
I have changed the throttle body and top IC hose Part of the high pressure system but that's it. I may fork out for a Samco kit. Hopefully Santa will bring me one
__________________
HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord' Last edited by Georgey dee; Dec 8th, 2007 at 13:28. |
Dec 8th, 2007, 14:28 | #6 | |
Phoenix from the ashes
Last Online: Apr 24th, 2024 01:05
Join Date: Jan 2006
Location: Finchingfield
|
Quote:
as a first off, get a new set of plugs and regap to 6mm, this should help the spark compensate for the "extra" fuel.....i cannot stress the difference this has made to my car.... cheers jod
__________________
Dum Spiro Spero VOC 20419 |
|
Feb 6th, 2008, 18:48 | #7 |
Premier Member
|
Right then,
After a round trip of 500 miles the judder is still apparent and does seem to be temp related as going up in the snow is wasn't too bad but coming back in the freezing temps it was worse. Also as a side note I murdered a pheasant on the way up too. Pictures to follow!! Guess who won that one!!!!!!! Well, Pete (dooby), is on his way up to help and hopfully we'll have this sorted tonight. Stay tuned between now and 22:00 George
__________________
HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord' |
Feb 6th, 2008, 23:28 | #8 |
Premier Member
|
23:30
Hmmmm, No joy I'm affraid Lambda Cam Position MAF ECU Sensors Swapped All fault codes reset and re-checked with no joy I'm confused Thanks Again Pete for going to all that trouble and coming up to Marham to help me out. Top Bloke!! Cheers George
__________________
HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord' |
Feb 6th, 2008, 23:37 | #9 |
Phoenix from the ashes
Last Online: Apr 24th, 2024 01:05
Join Date: Jan 2006
Location: Finchingfield
|
George, you need to stick the car on a rolling road, where i would be certain you are running rich, showing a inlet leak...
If i was you i would stick a samco hose from the inlet manifold to the pcv, have you tried a mbc to elliminate a lazy actuator..I would also consider the recirc valve, itslef and the hose to the inlet... cheers jod
__________________
Dum Spiro Spero VOC 20419 |
Feb 6th, 2008, 23:40 | #10 |
VOC Member
Last Online: Nov 13th, 2023 22:12
Join Date: Aug 2006
Location: Essex
|
You are a very calm with this hope you can get to the bottom of it.
__________________
Volvo V40 T5 R-Design Lux Nav Geartronic owner |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|