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  1. #1
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    High idle and loss of power.. Suggestions?

    Evening all, My T5 has recently developed a strange fault, It initially idled perfectly at 850rpm and performed superbly.

    Few days ago, once warm, it idled at 900rpm and it feels like 150hp rather than 300hp.

    Now, its got progressively worse, it is idling (once warm) at 1000rpm and the performance is even less.

    Its sluggish, it feels strangled and held back, the exhaust is more boomy and sounds like a Fiat Punto 1.2 with a Big bore, it feels like there is no boost.

    I have also noticed, when planting the throttle and getting nowhere fast, upon letting off the throttle for a gear change i can hear what sounds like a slow dump valve letting off pressure, (not a quick "psst", but a long "pssssshhhhhhhhh" this noise has only started happening since this fault occured.

    Im stumped because since owning it up until a few days ago it has been excellent.

    I've OBD2'd it and its giving me nothing.

    Over the last few days, the idle has been progressively increasing and the performance decreasing, have had a look round the web and cant find anything similair, obviously the two symptoms are connected.

    Thanks for your help guys. I knew the ME7 was a little troublesome but the comfort of the P2 option outweighed the prospect of a P1 with throttle cable.
    '04 S60 D5 163

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    The 'pssssssh' sound you describe sounds like a boost pipe that has worked its way partially off. Check the I/C to ETM pipe and the connections on the charge pipe at both ends. Failing that it could be a vacuum leak so check your vacuum hoses.

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    pillapow (Monday 24th March 2014)

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    You got a split /loose pipe somewhere


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    Further thought, the high idle could be due to the ECU not getting the right readings or confusing ones because unmetered air is getting in, that's my logic anyway.

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    pillapow (Monday 24th March 2014)

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    As above, you have a big air leak mate, check all the big pipes (even the maf to turbo pipe)
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    Thanks for the suggestions guys, I have just been and picked up a set of car ramps so i will be able to pull it apart tomorrow, I couldnt do much as my trolley jack split a seal! I'll check all the pipework and connections, boost pipes and intercooler etc. Cheers.
    '04 S60 D5 163

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    Quote Originally Posted by pillapow View Post
    Thanks for the suggestions guys, I have just been and picked up a set of car ramps so i will be able to pull it apart tomorrow, I couldnt do much as my trolley jack split a seal! I'll check all the pipework and connections, boost pipes and intercooler etc. Cheers.
    You don't need ramps. All of the pipes are accessible from under the bonnet.

    What car? S60 T5?
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    maybe worth checking the exhaust system, could be a Partially blocked cat or silencer.

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    Quote Originally Posted by LeeT5 View Post
    You don't need ramps. All of the pipes are accessible from under the bonnet.

    What car? S60 T5?
    Its an X reg V70.

    Quote Originally Posted by merc85 View Post
    maybe worth checking the exhaust system, could be a Partially blocked cat or silencer.
    The exhaust is 6 months old, it is a custom system with 200 cell cat.
    '04 S60 D5 163

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    Quote Originally Posted by pillapow View Post
    Its an X reg V70.
    Still, all but one pipe is accessible from above mate.
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    Quote Originally Posted by M-R-P View Post
    Still, all but one pipe is accessible from above mate.
    ok fair enough, i'll keep it grounded!
    '04 S60 D5 163

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    Couldnt work on the car today due to the weather but i did about 20 mile in it food shopping etc..

    Few more surprises, pulled the maf plug when engine was warm, engine struggled for a few seconds and cut out, replaced plug and read codes, gave a p0121, idle was very lumpy after that for a minute or so but when revving, it sounded good, then it idled at 1500rpm for about 2 mins, then settled down, back to 950rpm and sounded boomy and crap when revving, scanned codes, nothing showing. Its all noise and no get up and go at the moment.

    I checked the vac line from manifold to brake servo, quite a new pipe and no signs of splitting or wear. Sprayed some WD40 around the turbo and intercooler pipes, no change in engine sound.

    Revving is laboured and laggy, not responsive like it used to be.
    '04 S60 D5 163

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    Quote Originally Posted by pillapow View Post
    Couldnt work on the car today due to the weather but i did about 20 mile in it food shopping etc..

    Few more surprises, pulled the maf plug when engine was warm, engine struggled for a few seconds and cut out, replaced plug and read codes, gave a p0121, idle was very lumpy after that for a minute or so but when revving, it sounded good, then it idled at 1500rpm for about 2 mins, then settled down, back to 950rpm and sounded boomy and crap when revving, scanned codes, nothing showing. Its all noise and no get up and go at the moment.

    I checked the vac line from manifold to brake servo, quite a new pipe and no signs of splitting or wear. Sprayed some WD40 around the turbo and intercooler pipes, no change in engine sound.

    Revving is laboured and laggy, not responsive like it used to be.
    P0121? That's 'Throttle Position Sensor "A" Circuit Range/Performance' which basically translated means "you've got an upset Throttle Body". I got that code last week when my ETM to Intercooler Pipe was loose so I'd check there first for splits, or pipes loose at either end.

    Let me know how you get on mate.

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    Quote Originally Posted by JamesT5 View Post
    P0121? That's 'Throttle Position Sensor "A" Circuit Range/Performance' which basically translated means "you've got an upset Throttle Body". I got that code last week when my ETM to Intercooler Pipe was loose so I'd check there first for splits, or pipes loose at either end.

    Let me know how you get on mate.
    That code also pops up if the maf isn't getting good airflow. I'd start with the inlet pipe from the maf to the turbo, it's probably split or come off the compressor housing.
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    when i read boomy the turbo is the first thing i thought of. if the turbo isnt spinning it wont kill the sound and ill go loud. mind you im probobly miles off what is wrong.
    s60 2.4 t5 eibach springs,up rated rear anti roll bar, poly bushed wishbones, poly lower engine mount, fmic, bmc air filter, 3" decat, 2.5" stainless exhaust,hlm remap 328bhp,

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    Quote Originally Posted by M-R-P View Post
    That code also pops up if the maf isn't getting good airflow. I'd start with the inlet pipe from the maf to the turbo, it's probably split or come off the compressor housing.
    There was no codes before i pulled the maf connector, only after i had pulled it did it give the p0121, after all had settled etc and a ignition cycle, rescan and no code, i assumed the removal of the maf connector caused this code to show up.

    Sorry, i also forgot to mention earlier, when the car eventually decides to idle at 1000rpm when warm, if i rev while stationary to say 2000rpm, 3000rpm or even 4000rpm, the engine will come down from the rev as normal but when it gets to 1500rpm, it sort of revs ever so slightly whilst on its way down to the 1000rpm idle.

    Sorry if i sound confusing, i can video record what its doing if needed.

    Thanks for the help.
    Last edited by pillapow; Tuesday 25th March 2014 at 22:29.
    '04 S60 D5 163

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    MAF sensors don't always show up on a code reader unfortunately mate. Sometimes a session on Vida will tell you more and this will cot about £45 if you don't have the setup at home.

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    Quote Originally Posted by pillapow View Post
    There was no codes before i pulled the maf connector, only after i had pulled it did it give the p0121, after all had settled etc and a ignition cycle, rescan and no code, i assumed the removal of the maf connector caused this code to show up.

    Sorry, i also forgot to mention earlier, when the car eventually decides to idle at 1000rpm when warm, if i rev while stationary to say 2000rpm, 3000rpm or even 4000rpm, the engine will come down from the rev as normal but when it gets to 1500rpm, it sort of revs ever so slightly whilst on its way down to the 1000rpm idle.

    Sorry if i sound confusing, i can video record what its doing if needed.

    Thanks for the help.

    A video would be great help. Wear abouts are you
    s60 2.4 t5 eibach springs,up rated rear anti roll bar, poly bushed wishbones, poly lower engine mount, fmic, bmc air filter, 3" decat, 2.5" stainless exhaust,hlm remap 328bhp,

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    Quote Originally Posted by JamesT5 View Post
    MAF sensors don't always show up on a code reader unfortunately mate. Sometimes a session on Vida will tell you more and this will cot about £45 if you don't have the setup at home.
    Would one of those Vida modules with the software disc do the job, they are £60-80 online, there is a volvo specialist near me but £50 for a diagnosis seems a bit steep especially if i can do it myself with one of those units.

    Quote Originally Posted by graemewelch View Post
    A video would be great help. Wear abouts are you
    I'll get a video tomorrow of what its doing and post it, I am in Lancashire.
    '04 S60 D5 163

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    Quote Originally Posted by pillapow View Post
    Would one of those Vida modules with the software disc do the job, they are £60-80 online, there is a volvo specialist near me but £50 for a diagnosis seems a bit steep especially if i can do it myself with one of those units.



    I'll get a video tomorrow of what its doing and post it, I am in Lancashire.
    miles away from me so im not much help. judging by what your discribing i very much doubt its the maf. how dose the car rev underload. ie on the road. if theres no fault codes except for when you disconected the maf id say your looking at a mechanical issue but the generic code readers arnt always the best for picking up all codes. id check everything you can thats easy and free. is your turbo healthy. all boost pipes in good condition. youd prob get a code if one blew off. i did on mine. is there a blockage in the exhaust somewear. i once had a issue like that on a astra. it sounded like it was hissing when reved. once i loosened the bolts on the manifold to exhaust it reved normaly. these are just suggestions and i could be miles away. its hard to diagnose issues with out having the car infront of me. wrap up warm tomora and get stuck into it
    s60 2.4 t5 eibach springs,up rated rear anti roll bar, poly bushed wishbones, poly lower engine mount, fmic, bmc air filter, 3" decat, 2.5" stainless exhaust,hlm remap 328bhp,


 

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