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Sick 1.8T


SteveAA
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I have posted in the Passat area regarding a problem with my '98 120k miles 1.8T Sport estate Passat.But thought I may be able to get some help in this area also.

It seems to have lost a lot of power. Acceleration is v. poor, although it still pulls through the rev range in the lower gears progress is nowhere near as rapid as it used to be. In fourth it really stuggles and no matter how hard I try I cannot get it to pull above the ton. Someone has suggested the MAF may be at fault is there any way of checking this? I took the car to a VW dealer but thier diagnostic gizmo showed no real faults. Any thoughts or clues would be welcome

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I came across your note as I am also having problem with my Golf GTi 1.8 20v (non turbo) similar to yours. It had 40K service on Friday which made the problem that I've had for the last two months worse (apparently the ECU gets used to problem over time, but it can't be good for the car (all that hesitation and wondering whether the car will pick up the revs!)). The dealer had no error codes during the service, but said that the air mass sensor is the most likely component at fault (aparantly common with TDIs too). No way of verifying (by the dealer, according to them, they just put a new one and see whether it does the trick or not!!!), except £240+ for the parts plus labour. I've seen the part cheaper at (German Swedish ... web site). The unit is easy to change (I did take it out of the car in less than 15 minutes over the weekend to see if there was an abvious and visual fault, but no such luck) however I don't know whether the system requires resetting post new part. Perhaps someone in the know will tell us. Keep me posted with your progress. I am going to wait for a week or so before taking any action (more research is called for!!!!). Good luck.

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it might be worth checking the turbocharger boost control hoses to and from the the turbocharger wastegate actuator and the charge pressure control solenoid(on the main bulkhead). check them for tiny leaks or cracks.

check the vacuum/pressure line to the fuel pressure regulator too for obvious reasons

it might also be worth checking(if fitted on your engine?) the secondary air injection valve also as this could cause a loss in power if it was jammed open.

I dont think it will be the Mass Airflow Sensor because if this was broke the engine probably wouldnt run!

Does the engine idle roughly or is ok????

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i can almost guarantee that it is the air mass meter. i have seen this problem many times before on the 1.8, you can change it yourself and you will notice the change instantly, but it is best to take it to a vw tech to get the readiness code reset. also i recomend cleening your intake manifold with suburu upper engine cleener.

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Steve,

I took my Golf to an Electronic Rngine Tuning place recommended by my local VW (non dealer) spare part supplier. He put the car on his machine and went for a drive. 5 minutes later he came back and said that it was the Air Mass Meter, as he was not registering the correct air volume that he expected. Tomorrow he will fit the new unit and reset the ECU. So, although the unit can be changed, the system needs resetting. If you leave near South Wales (not Australia!!), tell me and I will give his phone number to you.

Will post the out come tomorrow evening.

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My Golf GTI is alive!! Thanks to a new Air Mass Meter (sensor- whatever you want to call it).

The ECU didn't need resetting, so I could have done the job myself, but by getting a specialist tuning chap to confirm the fault, at least I won't end up changing everything in the car (Old saying, find the cause, don't cure the symptom!). Now a feedback on cost. He charged me £25 for the diagnostic examination and £175 for the part. Cash payment (if you know what I mean!!!!!).

Part is available from www.gsfcarparts.com under the "air mass meter" search catagory @ £165 + VAT + postage.

If anyone needs the details of the workshop (North of Newport - South Wales) here is his phone number "Auto Tech Services" 01495 247218 & his name is Kenton.

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Sorry Steve, I just left a note on the Passat Side (by the way I had a Passat (1.8 20v)for 4 years as well as the Golf (my 4th Golf). No they are not taking the p... Check the "germanswidishfrench" parts site (www.gsfcarparts.com) If you want second hand, try this site. www.partsgateway.co.uk . I used it and had two breakers offering me parts for £45 & £60 + VAT (one was V-Dub Motors, tel 01732 882276 and the other was Volks-Apart, tel 02083172330. But you do need the part number which unfortunately is stamped on the underside of the unit as its fitted to the car (either take it out or use a good mirror if you can). Also, I think buying second hand is a false economy (they only come with limited warranty). My chap who did the job said, quote" it's the salt on the road that gets sucked in and passes through the air filter which attacks (buggers is what he said) the electronics". Look, I don't know where you live, but give Auto Tech a call and talk to the guy. He is a nice guy, and might be able to advise you over the phone to check for things. Good luck

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I work in the Auto Industry & I can tell you that the mark up for spare parts by the vehicle manufacturer varies from 3 to 5 times of what the supplier (Bosch in this case) charges as OE parts supplied to the assembly plant.

But overall I agree with you. I would only expect to pay £50 for this part. After all, its a metering device with non moving parts. It would have been cheaper if the sensor was replaceable, by keeping the casing the same. Oh well I mustn't slagg off the industry that feeds me too much!!!

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Steve

Can't answer that one because I didn't try it on my Golf. But I figure that if the ECU doesn't recieve any signal from the meter, it should switch to "limp Home" mode which prevents the car from performing as "normal" not to damage the engine. Hence, you should not notice difference. How is the MPG figure these days? Has it gone up (suggesting that you burn more fuel as engine doesn't get the right mixture.

My problem was that I couldn't get the car to go right through the rev range. On the motorway, climbing a hill, it would start to slow down and by pressing the accelerator pedal further, it would really struggle and in fact would feel as though it was going to come to a halt. Now, it is back to it's usual mode, and you can red line the revs in all gears.

Because you have a turbocharger, (and they can be expensive to mend!), I recommend you get the car tested propoerly (not VAG dealer - charges would be extorsion!). Go to an independent parts supplier shop in your area and ask the chap to recommend a good Engine tuning & electronics guy. They usually will only send you to good guys. That's how I found out about mine.

Good luck

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Rafi,

My Passat will still redline in the first couple of gears but it take a long time getting there, I used to have trouble changeing up quick enough.

To try and quantify it for you I also have a 1971 2002 BMW (normal carbed model)and that leaves the Passat standing.

Also the car absolutely refuses to go above the ton, it's almost as if there is a restricter fitted.

The car used to fly and now it's lost all of its sparkle.

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Steve

My Golf was the same. I had lost confidence in joining the traffic or even changing lanes in the motorway!

I searched yell.com and it came up with this entry in milton keynes:-

Crypto-Tune

43, Booker Avenue Bradwell Common

Milton Keynes Buckinghamshire

MK13 8EG

Tel: 01908 230444 • Mobile Engine Tuning

• Mobile Servicing

• Diagnostics/Fault Finding

• Minor Repairs

• Non Starters/Breakdowns

• Herts/Beds/Bucks Coverage

It's worth giving them a call to see how much they charge, and more importantly if their device plugs into your car to read any error codes, etc..

Ironic really, you live in Milton Keynes. The home of VAG UK!!

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  • 1 month later...

Ok quick update on my Passat, tried to order the MAF yesterday only to find that there are none in the country and they are on back order in Germany, Bosch are quoting 12 weeks for delivery.

So as you can imagine I am seriously pissed off, and now looking around the breakers.

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