roblatus

During my drive to work this morning i seemed to lose the boost on my Octy.
I had been driving steadily for around 10 miles of the 14 mile trip to work, then i decided to give it a bit of welly pulling out of a junction and it felt as though i was back driving my old 1.6 focus. I am also fairly sure there was little or no turbo whistle or DV sound - which has been more noticably loud since my Jabba remap. There was no warning lights showing on the dash and the car drove ok but with no where near the usual power.

During the day i went out and checked that all the hoses to the DV where still attatched and they were.

When i came to leave work tonight the car drove fine all the way home. Plenty of power, turbo and DV all sounding fine.

Does anyone have any idea what this problem may be? I changed the DV for one of an Audi TT before my remap, could this be the problem? What should i be checking and if it has to go to the dealers what are my chances of them sorting it under warranty even though the car has been modded?

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

Goochie

Rob.

Its a common problem, mine does it maybe once a month.

See page 2 of this thread for an explanation: http://www.briskoda.net/forums/showthread.php?t=22537

roblatus

Thanks for the link

i read this reply from Jabba that you posted


Hope this information helps, it's come from Michael who does the mapping.
This is a common problem with VVT 150 & 180 bhp engines 30% of cars over
30,000 miles coming in for re - maps will have the fault code logged boost
pressure loss between turbo & throttle when in reality there is no leak,
once triggered the turbo will run actuator pressure until you turn the
ignition off then on again. To alleviate the problem remove the boost pipe
to the throttle body, push the throttle flap open & wipe round with a cloth,
remove any accumulated sludge wetting the cloth with petrol or carb cleaner,
do not use tissue as it can break up & get left in the inlet manifold. Re
fit the boost pipe then turn on the ignition, but do not start engine leave
for 2 - 3 minutes before starting the engine. As mentioned earlier, it's a
common problem on standard cars, but less noticeable as the boost difference
between the standard 0.6 bar & 0.35 actuator pressure.



Did you follow their instructions and clean the throttle body area? If so does it make any difference?

Also do you have a standard or aftermarket DV and do you think it would be worth my while upgrading my Audi TT one to a forge or bailey?

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

bengie

mines doing it more often at the moment but i'm putting that down to me fooked turbo. a quick restart sorts it

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owner of a skoda octavia 4xvrs3

roblatus

one other thing.

My car has only done 17k miles.

Should i be worried or just accept that this is a common problem?

I would really like to know if fitting a forge DV will help or not.

Also is cleaning the throttle body and resetting it an easy diy job. If so could someone please give me very simple instructions to follow please.

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

FocusZtec

My 2002 4x4 Elegance hatch has 21k on the clock and i experience this maybe a couple of times a month. Im just living with it for now but when I get a chance I'll follow the above advice.

Lee

roblatus

i think i am going to do it too if i can get more simplified instructions


Not even sure of the exact location of the throttle body and boost pipe. I am confident of doing the job but not sure of its location under the bonnet

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

fastVeRSion

Does this help?

Attached Images

vrsenginebay.jpg (60.5 KB, 115 views)

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Goochie

Not cleaned mine out yet, because its easy enough to "solve" the problem. VAG-COM logs an intermittent pressure drop for this.

roblatus

Thanks for the pic. Is the boost hose easily accessable on the throttle body?

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

jimmyskeen

note cleaning the throttle housing is an old wives tale -- tried this many times with my vrs even spent the £350 for a new throttle housing still no joy replaced the dv last week but on my way home tonight it lost boost again- if you reset the throttle housing its ok again because the e.c.u puts it in safe mode you need to check all intake hoses for leaks - gonna take my bumper off next week and check the intercooler hose clips im gonna spend all day on it till ive solved it - its been into the dealers many
times but they cannot solve it - no fault codes are showing in the e.c.u so its got to be a hose leaking if any one else has cured thair fault please let us know how i will report back once if had a play

noodles

Just posted another post to say my problem was solved by replacing the intercooler hose and also the throttle body cleaned and new overrun valve... Do you actually get an engine warning light? I didnt for a couple of months, but as soon as i did, got this work done, and so far so good.

Goochie

Interesting, my car DOES report a fault code that suggests a pressure drop (from a leaking hose). But if it was a leak why does it only do it some times and reset so quickly ? Perhaps there are 2 different problems with the same symptoms.

roblatus

No warning light for me

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1998 Mazda Roadster 1.8 RS Spec. spending a lot of time sideways

jimmyskeen

me niether but if the e.c.u picks up a boost pressure drop it goes into safe mode til its switched off then on to reset it wicth points towards a hose - another prob tonight the revs were dropping below 700 rpm on idle felt like it was running on 3 cylinders until you revved it but it seems to drive better than its done for a while any ideas??????
note i used to have the code 17705 throttle valve pressure drop so I changed my bailey dv back to a new standard one and that code has not come back since -but it still drops boost?
gonna try a n75 valve before stripping all the boost pipes
ps anybody know whare i can get a decat pipe from?

DGW

Possibly a coil pack on the way out. What version is fitted to your car?

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Denis

2002 Octavia 1.8T 4X4 turbo Estate - rebreathed on by Jabba ... 31.93mpg
2007 Fabia vRS - CC, ESP and full leather trim by Seat Surgeons ...48.57 mpg...

radioone

I am having the same problem, it is losing power when i put my foot down. I have put it down to a fuel starvation problem up to now. For me, the problem only occurs when i am low on fuel, e.g. going into the red. I have the 1.9 TDi. do you have the problem when you are low on fuel or when you have fuel. I was going to ake it into a local garage, but i am dreading the bill!!! if it is nothing to worry about, or just a simple job, i can have a look!!! but i had no idea so didn't want to mess!!!

Nigel26

been having this problem on and off for a month or so now... the cars booked into the dealers on the 16th of Jan to have the throttle bodie replaced under warranty.

i'm assuming they have had others in with the same problem asd they havent looked or changed anything else before hand where i have read other threads where this has been done and the TB changed as a last resort.

i'll give feedback when they've done the work.

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Sea Grey Mondeo Titanium X

Goochie

Interestingly, my car has done this to me 3 times since Christmas day Not sure if it is a "bad" batch of petrol (Shell non-optimax) of the cold weather.

Very annoying.

MC Bodge

Having had a re-map a few weeks ago, I've been really pleased with the performance.
During the past week I've felt that the performance wasn't as good as it had been -I was willing to accept that I'd just got used to it. It still felt quick and the turbo spooled up, but the 'boost' didn't appear to be quite as strong as before.

Driving my car this evening (2degC according to the climate control), after leaving some motorway roadworks I put my foot down in third and it pulled very hard, but then the boost dropped quickly (the engine then felt normally aspirated) as if the pressure relief valve had stuck closed, causing over-boost and then opened suddenly.

I backed off a bit and then put my foot down again and performance was good again. I'm hoping that any issues have resolved themselves, but I'll give the car the once-over and check for pressure leaks tomorrow.

Is this consistent with other people's experiences?

I think a boost gauge may be a good investment. Which is a good one to get?

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Mk1 Octavia vRS. The thinking man's Hot Hatch.
PS. Give Cyclists Room! We're quite vulnerable. If I can slap your window, you're too close

MC Bodge

Well, having driven it again this morning, I can confirm that performance is (back?) as it should be. It's always difficult to gauge these things by 'feel' and the 'seat-of-the-pants dyno' though.

Throttle response is good again. I'm not sure what the reason for last week's lethargy or last night's boost drop was though so I'm going to remove the undertray and have a look at the intercooler and piping.

ps. The CD autochanger doesn't like cold weather so maybe that's the problem

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Mk1 Octavia vRS. The thinking man's Hot Hatch.
PS. Give Cyclists Room! We're quite vulnerable. If I can slap your window, you're too close

MC Bodge

Like Goochie, I'm beginning to suspect that I had some dodgy Optimax last week or the week before....

I hadn't just 'got used' to the re-map, as it's back to feeling fierce again.

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Mk1 Octavia vRS. The thinking man's Hot Hatch.
PS. Give Cyclists Room! We're quite vulnerable. If I can slap your window, you're too close

Goochie

Filled up with BP ultimate on Saturday - this morning (Monday) it dropped in power twice

MC Bodge

That's annoying....

Although it's working brilliantly now, I'm going to check my car over quite thoroughly this week and a boost gauge is on its way.

I'm also certain that the ambient temperature has a big effect on the performance beyond the normal 'cool, dense air' thing, whether that's due to mechanical or software reasons.

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Mk1 Octavia vRS. The thinking man's Hot Hatch.
PS. Give Cyclists Room! We're quite vulnerable. If I can slap your window, you're too close

Goochie

My car first mis-behaved in this manner in february last year, over the summer is did it maybe once a month. Since December it has been doin git a couple of times a week.

Very annoying this morning as it was running fine, boosting well, then decided to drop boost just before I went to overtake someone - I diddnt know about it until I was just about to pull out.