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Model specific boards => Golf mk4 => Topic started by: Ivor Mk4 Turbo on 21 October 2006, 13:13
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A strange one this. I have recently seemed to pick up a bit of an intermittant fault. The turbo seems to have spells where it doesn't want to kick in. There are no warning lights, no strange noises, no unexplained smoke, no strange smells. When this is happening, the car idles fine, but the revs seem to take forever to climb (does it smoothly, though). There's just no kick from the turbo whatsoever. :sad: Clutch isn't slipping, either.
Then the next journey and/or next day, it will be back to normal again. It's been alright for the last 4 days or so, but did it again last night.
I'm fearing the turbo could be on the way out! :cry:
If anybody has ever suffered anything similar, or got any ideas on what to do, I'd be extremely grateful.
Thanks,
Ivor.
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i wouldnt expect it to be intermittent if the turbo was dead, boost solenoid maybe... need to get it on vagcom really or you could be looking for the fault for ages.
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Just thinking aloud -
Have you checked the pipework for leaks, also do you have any oil in the pipework from crank case presure ? Oil could be plugging the leaks temporarily and then, next day, it's moved out of the split.
I do think as Topher, a diagnostics check is the fastest route to a guaranteed fix.
I dont think it''s your turbo, it would have been slowing reducing it's effectiveness over a long period.
I'm sorry, But I've not owned the turbo for more than 4.5 months, and my previous one was a Saab "Hard" Garett one in the Saab 900 st.16 es
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First of all, thanks for the replies, guys.
I've finally had the motor on the diagnostics, & it has (according to the readout) turned out to be the 'Hall Sender'. Apparently, it's a 'cambelt off' job to change, can anyone please clarify.
Thanks, again. :smiley:
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Well Ivor, this is the best explanation I can give. I'm not a VW master technician, as you know.
It's the crankshaft sensor, I'm pretty sure of that. In this guise, it will be vital to timing in a vehicle will ECU ignition or to starting the operation for the turbo.
I'm surprised that the engine still runs sweet. The "hall effect" in electronics, is the ability of a circuit capable of counting.
Perhaps it's the revolutions counted before the turbo comes in ?
Here is a link to crank shaft sensors in China. When you buy a VW cambelt tensioner (a pully bearing actually) and about 4 times the price of the cambelt, it is made in Japan ! Who knows - Porche parts may be forged in China, Korea or Japan ??
Link to a similar or the same product ???
http://skk.en.alibaba.com/product/50127339/50584545/Auto_Electrical_System_Parts/Speed___Pressure_Sensors.html
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i have exactly the same problem with mine and its comin down to the re-map that was done before i brought it. when it does it if you turn the ignition off then back on again it re-sets the system and it will work fine.
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A pal of mine has suggested the following:-
"Its an engine speed / reference signal.
Sounds like our equivalent crank or cam pos sensor!?
Its part of the knock circuit too so your prob experiencing ignition retard and boost limitation, which would make sense."
STU: Where was your car re-mapped, do you know?
ps Mine's back at the stage where it doesn't return to normal after switching off! Saying that, though, it did return for a day, but that was after the car was left standing for a week.
DUNCAN: Yes, I'm surprised that it's running ok, too - Quite bizarre, really. (Although I sure am missing that 'surge' from the turbo, ATM! :sad: :grin:
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If it is the cam postion sensor, that costs roughly 80-85 from dealers :undecided:
If your not sure where it is, take the engine cover off, unclip the cambelt cover on the left, just hold it back you will see the sensor next to the cam belt its metal round and about the size of the palm of your hand. Its held on by 2 bolts ofcourse the wire connections... VERY easy to take off just mind you dont loose the bolts!!!
Im gettting cam belt postition sensor error on my car BUT its showing no loss in performance no hesitation nothing!!! :undecided:
What error code were you getting???
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Well, I've got the sensor prognosis right. Calling it a Hall sensor gave me the clue to a circuit capable of counting - as you said Ivor, a reference for crank revolutions.
Ivor, there is only one thing for it. Change the sensor, do you need a new cam belt or water pump ? They are all behind the cover, but to get it off, and clear of the work area, you have to undo the right engine mounting and jack it up a little to give clearance.
My independant technician in South Oxfordshire will do performance cars. Does my BM, I always see something quick or sweet in his workshop. If not, go to someone who is good and actually KNOWS.
Good luck.
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A pal of mine has suggested the following:-
"Its an engine speed / reference signal.
Sounds like our equivalent crank or cam pos sensor!?
Its part of the knock circuit too so your prob experiencing ignition retard and boost limitation, which would make sense."
STU: Where was your car re-mapped, do you know?
ps Mine's back at the stage where it doesn't return to normal after switching off! Saying that, though, it did return for a day, but that was after the car was left standing for a week.
DUNCAN: Yes, I'm surprised that it's running ok, too - Quite bizarre, really. (Although I sure am missing that 'surge' from the turbo, ATM! :sad: :grin:
not sure mate it was already done before i brought the car but its goin into jabba sport soon to have it re-done as im not sure as to weather the re-map is causing my problems however i took it apart to-day and have found the breather pipe off the rocker cover has split. im replacing it tomorrow so will keep you updated as to weather it makes any difference :huh: :grin:
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I've already booked my car into Autovolks (local specialist). £75 for the part, £220 labour (cambelt has to come off) + the extra for the new cambelt/rollers/water pump etc.
£400 + VAT in total!!! :gulp:
All I can say, is:-
a) Good job the cambelt is due anyway (6 yrs old), &
b) Good job I haven't had the cambelt etc changed already! :grin:
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£400 + VAT in total!!! :gulp:
All I can say, is:-
a) Good job the cambelt is due anyway (6 yrs old), &
b) Good job I haven't had the cambelt etc changed already!
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You are a jammy sod mate ! Lucky as Larry.
Me, I blew my pump out at 48k, less than 5 years as well, on the M6 whilst tailing an R32 at a ton 20. Was I pissed off :evil:. I parted with nearly £400 at a Dealer who was: only So So and 120 miles away from my technician, and to cap that all off - they spoilt my set up :angry:, and gave me extra vibration on doing up the engine mounting too hard, had to slaken off and align better when back home.
Ivor - check, check, check after the work is done - to make damn sure your Turbo is as sweet as it was originally. If not so - get back to them as soon as possible.
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right not sure if this will help at all but i seem to have cured my boosting problems and it only cost me £31. like i say it might no be the same but check the breather pipe coming of the rocker cover it has another pipe joining it and it goes off under the dump valve and joins up to a diaphram valve. mine had split and it was giving me idleing problems too.
(http://img.photobucket.com/albums/v715/adam_cope88/stus_pipe1.jpg)
hope this might help guys :grin:
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Good point Stu,
However I did ask Ivor if he'd checked this on 22nd October:
"Have you checked the pipework for leaks, also do you have any oil in the pipework from crank case presure ? Oil could be plugging the leaks temporarily and then, next day, it's moved out of the split"
Crank case pressure is determined by the rocker box seal or hoses coming off it. This may be an "old term " in engine maintenance that you are not familiar with.
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Cheers, Stu.
I did check all the hoses that i could see/get my hands at, but I wasn't experiencing any bad idling like yourself.
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Ivor, how is your power now, after replacing the Hall sensor and the cambelt, pulley tensioner and water pump impellor.
Did the hall sensor do the trick, has your 205 bhp boost been fully restored ?
I'm most interested in the sensors in the 1.8 turbo, how they play up, what the diagnosis might be when there is a drop off of power, what to look out for and teething troubles.
Is the Silver Bullet back on song ?
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Ivor, how is your power now, after replacing the Hall sensor and the cambelt, pulley tensioner and water pump impellor.
Did the hall sensor do the trick, has your 205 bhp boost been fully restored ?
I'm most interested in the sensors in the 1.8 turbo, how they play up, what the diagnosis might be when there is a drop off of power, what to look out for and teething troubles.
Is the Silver Bullet back on song ?
It certainly is, my friend!
Diagnosis & the new hall sender - Spot on!!! :smiley:
Although, they did phone me up on the day (before they started the work) to explain that they discovered that the hall sender on the AGU was in fact not obstructed by the cambelt (only on the later models), & that I didn't have to have the cambelt etc done. I still had it done , though, as it was overdue anyway.
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I'm really pleased you got the result you wanted.
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Ivor, I had my Hall sender messed up by a Dealer (or is it something else) who fitted my new cam belt and water pump when the impellor split, 50 miles up on the M6. I had been tailing an R32 since the A34, to see what he'd got. The weather and spray was appalling, so he didn't get away at all. I had fitted brand new wiper blades the week before.
Now the point of this story is: Is it the Hall sender or not ? Since that distress fix to get me home, the low down power is not there. I have to change down more for the turbo to come in, changing down looses edge. Before the mess up, she pulled reasonably well from 1850 rpm in 3rd, now the turbo is lazy, or delayed for some reason. Ultimate power is ok, but as you know, it is low down grunt where you like to have it , and where you need it - for real pull.
Ivor have you ? or anyone else had this dilema