maxxo Posted July 26, 2022 Author Share Posted July 26, 2022 i should also add, 2 days ago, it beeped randomly at me saw the yellow "service" light flash on by the time i looked at the screen it was gone, tried to use "check control" in the menu but nothing it could have been a good clue, but i had also used the washers so maybe the fluid sensor acted up Link to comment Share on other sites More sharing options...
Noel Tidybeard Posted July 26, 2022 Share Posted July 26, 2022 pedal sensor- as car is fly-by-wire there is no mechanical link between pedal & cruise control which is why car behaves normal with cruise switches myglaren 1 Link to comment Share on other sites More sharing options...
myglaren Posted July 27, 2022 Share Posted July 27, 2022 I think on yours it has a throttle cable that operates a potentiometer. One of mine when I bought it was pretty rubbish and, among other things, tightening the throttle cable made a substantial improvement. twosmoke300 1 Link to comment Share on other sites More sharing options...
maxxo Posted July 29, 2022 Author Share Posted July 29, 2022 erm right it did it again and i couldn't accelerate through it on cruise i can smell it running from behind at idle and lastly, just filled up on a tank i only got 430 miles before the light came on 31 mpg according to my calculations hmmmmmmmmmmmm Link to comment Share on other sites More sharing options...
maxxo Posted July 29, 2022 Author Share Posted July 29, 2022 does this sound, well, off to you all? just sounds different video-1659121056.mp4 Link to comment Share on other sites More sharing options...
AnnoyingPentium Posted July 29, 2022 Share Posted July 29, 2022 20 minutes ago, maxxo said: erm right it did it again and i couldn't accelerate through it on cruise i can smell it running from behind at idle and lastly, just filled up on a tank i only got 430 miles before the light came on 31 mpg according to my calculations hmmmmmmmmmmmm Sounds like it's running rich, as your evidence would definitely suggest. Start checking sensors etc that dictate fuelling as per the message I sent you on Facebook. Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 went out in this tonight with my father and lexia running, me driving, him monitoring fuel corrections on the injectors, fine however take a note of the eccelerator pedal position, especially towards the end and the turbo pressure setting and measured fuel pressure is a bit all over, but going to ignore that for now we bother agreed, turbo i feel there may be either a wastegate solenoid, or something like that wrong with the turbo system or, a tired turbo that's starting to give up after 180,000 miles disregard gearbox now, did several 100% throttle pulls even up a hill and it behaved perfectly Pat Earrings 1 Link to comment Share on other sites More sharing options...
RoverFolkUs Posted July 30, 2022 Share Posted July 30, 2022 Check for a boost leak, you won't always hear or feel them, but they'll be bad enough to cause issues under load. A smoke test through the inlet would be a good thing to try. Any smoke? A boost leak will also make it run rich - as the air (boost) will obviously be leaking out - so less air supplied than expected. Check the throttle pedal position readings at idle/stationary, that would confirm if it's potentiometer related. A potentiometer is going to fail both with and without load, not one or the other. Are those "0" points on the acc position occuring randomly or are they points where you've let off the throttle? AnnoyingPentium and maxxo 2 Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 so it's develped to the point now where it's up to temp you have a noticeable lack of power down low in the rev range if you accelerate hard you have nothing until around 3,000 rpm when you get a decent amount of black smoke out the back and you shoot off juddering in 2nd unlocked i think may be the same issue rear bumper has soot on the lower section turbo sounds a bit louder than before? not sure if i'm just noticing it more but no boost under 2.5k rpm at times when warm, the hotter the engine the worse it is full throttle acceleration up a hill to 90 ish, lacking in power at times and then boost comes back, lots of exhaust smoke Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 2 minutes ago, RoverFolkUs said: Are those "0" points on the acc position occuring randomly or are they points where you've let off the throttle? points i've let off the throttle, i was on an industrial estate so had lots of chances to accelerate hard, stop etc RoverFolkUs 1 Link to comment Share on other sites More sharing options...
RoverFolkUs Posted July 30, 2022 Share Posted July 30, 2022 Defo check for boost leaks. You're describing classic symptoms there. A garage probably wouldn't charge much more than 0.5-1 hour labour to do one. If you're lucky they might do it for cash at the end of the day 1 minute ago, maxxo said: points i've let off the throttle, i was on an industrial estate so had lots of chances to accelerate hard, stop etc In that case, pedal readings look fine to me Link to comment Share on other sites More sharing options...
RoverFolkUs Posted July 30, 2022 Share Posted July 30, 2022 Turbo assistance is usually quite low down in the rev range, once you're at the higher revs the turbo assistance is less efficient/required Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 Just now, RoverFolkUs said: Defo check for boost leaks. You're describing classic symptoms there. A garage probably wouldn't charge much more than 0.5-1 hour labour to do one. If you're lucky they might do it for cash at the end of the day In that case, pedal readings look fine to me doesn't seem to have one, pressures held fine just took ages to reach i think there's an issue with the wastegate Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 1 minute ago, RoverFolkUs said: Turbo assistance is usually quite low down in the rev range, once you're at the higher revs the turbo assistance is less efficient/required it was asking for 1.8 bar of boost, it couldn't get more than 1.2 Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 if worst case it needs a turbo, i'm happy to do that Link to comment Share on other sites More sharing options...
RoverFolkUs Posted July 30, 2022 Share Posted July 30, 2022 Yes it will likely be one or the other. Surprised you haven't got an underboost code It's not going to be a gaping boost leak, otherwise you'd have no turbo at all obviously. I've just done an S-Max and Freelander this week. Both were still boosting but down on power. the Freelander was smoking like fuck. Both had splits in one of their intercooler hoses Assuming the wastegate is vacuum operated it's worth checking the vacuum hoses. Turbo itself as a last resort Link to comment Share on other sites More sharing options...
maxxo Posted July 30, 2022 Author Share Posted July 30, 2022 i'd agree with boost pipe, but only when it's properly hot and then staying like that even as it cools down with normal driving..... wastegate is ECU operated with a vacuum valve i believe, they're £50 for a new one which i might try normally even i wouldn't delve this deep into diagnosing an issue, i'd normally bail but i bloody love this car paulplom, RoverFolkUs and Matty 3 Link to comment Share on other sites More sharing options...
Rusty_Rocket Posted July 31, 2022 Share Posted July 31, 2022 I'd advise you to take it to a proper diesel specialist, if you ever want to fix it. Internet experts and £50 here and there will lead to tears before bedtime, I promise you! Matty and Jazoli 2 Link to comment Share on other sites More sharing options...
Jds1 Posted July 31, 2022 Share Posted July 31, 2022 Sounds like either the boost solenoid or swirl valve / air doser. Yours is the 2.2 isn't it. https://frenchcarforum.co.uk/forum/viewtopic.php?t=26777&sid=cb75bf636084640da373177e8d4f1166&start=45 Link to comment Share on other sites More sharing options...
maxxo Posted July 31, 2022 Author Share Posted July 31, 2022 5 minutes ago, Jds1 said: Sounds like either the boost solenoid or swirl valve / air doser. Yours is the 2.2 isn't it. https://frenchcarforum.co.uk/forum/viewtopic.php?t=26777&sid=cb75bf636084640da373177e8d4f1166&start=45 2.0 so the simpler engine wastegate solenoid is what I’m starting to suspect now which is a lot better than a gearbox! Link to comment Share on other sites More sharing options...
RoverFolkUs Posted July 31, 2022 Share Posted July 31, 2022 19 hours ago, maxxo said: wastegate is ECU operated with a vacuum valve i believe, they're £50 for a new one which i might try Correct, you'll need to check the vacuum supply to the valve. The wastegate is vacuum operated, but the valve is in line to divert the vacuum to atmosphere or the wastegate, depending on what the ECU commands. If the valve is faulty they'll usually be stuck closed and you'll have no boost at all. However a difference depending on the engine being hot/cold cannot be explained by a split vacuum hose 🤔 Link to comment Share on other sites More sharing options...
maxxo Posted July 31, 2022 Author Share Posted July 31, 2022 2 hours ago, RoverFolkUs said: Correct, you'll need to check the vacuum supply to the valve. The wastegate is vacuum operated, but the valve is in line to divert the vacuum to atmosphere or the wastegate, depending on what the ECU commands. If the valve is faulty they'll usually be stuck closed and you'll have no boost at all. However a difference depending on the engine being hot/cold cannot be explained by a split vacuum hose 🤔 i think, it might be worn thermal expansion comes in to play at time and it sticks, only sometimes but it's getting worse funnily enough it didn't act up once today RoverFolkUs 1 Link to comment Share on other sites More sharing options...
maxxo Posted August 1, 2022 Author Share Posted August 1, 2022 did a new thing today didn't completely lose power but felt a bit meh moderate acceleration, not hard enough to kick down but enough to get up to speed quickly.....from 50-70 seemed to almost hesitate for a bit and kicked out some smoke grey smoke......not clag hmmmmmm Link to comment Share on other sites More sharing options...
maxxo Posted August 3, 2022 Author Share Posted August 3, 2022 which one is which? i'm aware one is for the EGR and the other for the turbo they both look fine, no split pipes and traced them all down as far as i could and there was no faults with them as far as i can see unless the solenoid has failed? that's the only thing i can think of 80 odd miles done it today, yes it felt a bit lacking at times but it was fine and economy was reasonable too no real smoke issues as far as i could see otherwise, the car is doing great still will need a wheel balancing and discs/pads at some point i'm really stumped on this now Link to comment Share on other sites More sharing options...
maxxo Posted August 6, 2022 Author Share Posted August 6, 2022 uh oh! driving along today, it felt fine went to accelerate and my god it was slow, glanced at the rev counter oh shit why's it going up managed to get it to do it on camera, you can just see the revs increase slightly.....never used to that and i don't think it partially unlocks the converter at those speeds (i think it just kicks down) video-1659795718.mp4 fun, i thought anyway, lost loads of power around the same time too but then it came back, then went away etc it got me thinking, mostly about the juddering so i pulled into the local industrial estate and did some experiments experiments with, well, sad findings this was full throttle...... video-1659795972.mp4 i noticed it juddering a bit too i then put the transmission in "snow" mode whichs locks in 2nd this was foot to the floor video-1659795729.mp4 you may hear a low pitched thud noise, no, that wasn't the road surface that was the whole car juddering Fuck with a capital F so, what do i think is the issue? i think i've got 2 issues i think the wastegate solenoid is worn out and causing a lack of boost when hot, that i don't mind, easy to fix however, as my discovery in snow mode....... i've certainly got a gearbox problem Link to comment Share on other sites More sharing options...
maxxo Posted August 6, 2022 Author Share Posted August 6, 2022 this is now most likely for sale sensible offers are welcome just want an easy sale Link to comment Share on other sites More sharing options...
maxxo Posted August 9, 2022 Author Share Posted August 9, 2022 well, it's the end of this project the car is unfortunately being picked up for scrap tomorrow i just can't justify the costs to repair what needs doing i'm really truly sorry, i tried, i really did but, this is terminal LDS leak, autobox is about dead, suspected EGR issue.....then a few little service items Dyslexic Viking, Matty, AnnoyingPentium and 1 other 4 Link to comment Share on other sites More sharing options...
maxxo Posted August 9, 2022 Author Share Posted August 9, 2022 i'll admit, i'm really really upset not devastated, worse, truly sad about this mercedade, Lacquer Peel, sdkrc and 6 others 4 5 Link to comment Share on other sites More sharing options...
Jim Bell Posted August 10, 2022 Share Posted August 10, 2022 You couldnt have done any more man. Best thing to do now is buy another one and do it all again. Matty, w00dy, DSdriver and 5 others 8 Link to comment Share on other sites More sharing options...
AnnoyingPentium Posted August 10, 2022 Share Posted August 10, 2022 Whit @Jim Bell said... It's the end of one era, and the start of another one... with another C5, of course. Matty 1 Link to comment Share on other sites More sharing options...
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