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P.Lindblom

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Posts posted by P.Lindblom

  3. Lupo 1,4 throttle problem

    in Volkswagen Lupo

    Posted

    Hi P. been reading this thread with interest as just before i bought my car a 1.4 s my ex had similar issues to those you describe. In short various bits were changed following suggestions from all she asked, in the end i bought the car and i have a spare throttle body as i fitted a brand new unit to the car just beofre i bought it, but the most significant improvement to the idle and general running cam from changing the temp sensor.

    Now i am not syaing this was any stroke of genius, more like a what else can it be type of thinking, but it did make a difference. and at £6 or so a cheap way of ruling out anything minor that may make a difference.

    Having said all that, i have a throttle body if you want to talk further on it, mail me direct.

    Hello mate,

    That's interesting. I just ordered a new temp sensor. I don't think I'm going to need another tb, though, as I've tried three different ones with the same result but thank you anyway :)

    I just had a look at the protocol from the VAG garage and apart from the misfiring there are two values that are slightly off. The engine load at idle is 30%. According to the mechanic it should be below 20%.

    Also, the intake pressure is 500mBar when it should be 240-420mbar.

  4. Lupo 1.4 16V AUA throttle valve behavior

    in Car Care, Maintenance and Mechanical

    Posted

    Today I had VAG check the car and they couldn't say what is causing the problems. They did a whole bunch of tests and discovered that the engine is misfiring intermittently on cylinder 3. They told me it's probably caused by either:

    1. A bad injector

    2. Intermittent loss of compression in cylinder 3 (is that even possible?)

    I really really hope it's just the injector. I'm so tired of this car right now, but if I could at least get it running properly I would probably be able to stand all the other small issues. A new injector is £180 so I'm going for a second hand one for £40, but first I'm going to ask the mechanic how they figured out which cylinder is misfiring. Then I'll swap the no. 3 injector with one of the others and see if the problem follows.

    By the way, is cylinder 3 the third from the left or from the right if you're standing in front of the car looking at the engine?

  5. Lupo 1,4 throttle problem

    in Volkswagen Lupo

    Posted

    Today I had VAG check the car and they couldn't say what is causing the problems. They did a whole bunch of tests and discovered that the engine is misfiring intermittently on cylinder 3. They told me it's probably caused by either:

    1. A bad injector

    2. Intermittent loss of compression in cylinder 3 (is that even possible?)

    I really really hope it's just the injector. I'm so tired of this car right now, but if I could at least get it running properly I would probably be able to stand all the other small issues. A new injector is £180 so I'm going for a second hand one for £40, but first I'm going to ask the mechanic how they figured out which cylinder is misfiring. Then I'll swap the no. 3 injector with one of the others and see if the problem follows.

    By the way, is cylinder 3 the third from the left or from the right if you're standing in front of the car looking at the engine?

  7. Lupo 1.4 16V AUA throttle valve behavior

    in Car Care, Maintenance and Mechanical

    Posted · Edited by P.Lindblom

    I did a compression test yesterday and all four cylinders reached 14 bar (~200 psi). One more thing off the list then.

    [X] Clean throttle body

    [X] Do a throttle body alignment

    [X] Change oil & oil filter

    [X] Try injector cleaner

    [X] Replace air filter

    [X] Replace spark plugs

    [X] Replace HT leads and coil pack

    [X] Try another throttle body

    [X] Do a compression test

    [ ] Check/replace MAP sensor

    [ ] Clean/replace EGR valve

    [ ] Check the cam timing - How do you check that?

    [ ] Look for air leaks (breather hoses, vacuum hoses, brake servo, etc) - Is there a list of all vacuum hoses so I can just order new ones?

    [ ] Replace vacuum pipe to the fuel rail?

    [ ] Replace fuel filter

    First, find TDC on cylinder1. You can do that by looking at the crank pulley but an easier way is to remove the plug from cylinder1, poke a long screwdriver or something similar in until it touches the piston, turn the crank pully until you feel the piston reach it's highest point (you may have to turn the puley back and forth until you find the right spot).

    Next, whip off the top part of the cambelt cover and check that the holes in the cam pulleys line up with the holes in the head. You can use 8mm drill bits to line them up.

    Have a look here for more info.

    timeing belt procedure

    Thank you :) I will try that as soon as I can.

    I've recently noticed another strange behavior which I think is caused by the same problem. When driving slowly (around 30mph) in 3rd 4th or 5th gear at low throttle the car feels kind of jerky. It feels like short, intermittent misfires. As long as I'm accelerating or driving fast it's smooth though.

  8. Lupo 1.4 16V AUA throttle valve behavior

    in Car Care, Maintenance and Mechanical

    Posted · Edited by P.Lindblom

    I'd check the MAP sensor, compression, cam timing, look for any air leaks in the intake manifold (breather hoses, vacuum hoses, brake servo, etc).

    I had a similar problem and, after exhausting all other posibile faults, found the cam belt was one tooth out!

    Thank you for your reply. I got another reply in the other thread as well.

    do you still have problems with this?

    My car has done this really badly since the engine was refitted, had a good look at it yesterday, and when we took of the vacuum pipe from the fuel rail it ran perfectly?

    We found a spare tube and fitted it, its not perfect but its 100x more better! down to the plastic part of the tube sitting loose in the rubber attachment ends.

    Can't be sure if it will be your issue but won't hurt to try it?

    Let me summarize:

    [X] Clean throttle body

    [X] Do a throttle body alignment

    [X] Change oil & oil filter

    [X] Try injector cleaner

    [X] Replace air filter

    [X] Replace spark plugs

    [X] Replace HT leads and coil pack

    [X] Try another throttle body

    [ ] Do a compression test

    [ ] Check MAP sensor

    [ ] Check the cam timing - How do you check that?

    [ ] Look for air leaks (breather hoses, vacuum hoses, brake servo, etc) - Is there a list of all vacuum hoses so I can just order new ones?

    [ ] Replace vacuum pipe to the fuel rail?

    [ ] Replace fuel filter

  12. lupo back box

    in Volkswagen Lupo

    Posted

    Na its the reiger kit i think, about as close as you can get to Gti bumpers.

    Exacly. I thought it was a GTI bumper when I bought the car, but I realized GTIs are wider and their rear bumpers wouldn't fit a standard Lupo. It's indeed a Rieger bumper/lip I've got.

  15. Swedish Lupo 1,4 16V with Rieger front & rear

    in Member's Cars

    Posted · Edited by P.Lindblom

    I don't know if it's bad luck or if the Lupo is a poor car, but it's given me quite a few headaches this winter.

    • The throttle response is really wierd
    • EPC light used to flash a lot and the Check engine light came on a few times during winter. The engine decided to shut down one cylinder a few times.
    • The windscreen washer pump gave up
    • The power windows work when they feel like it
    • The remote unlocks both doors but the passenger door usually locks itself again after less then a second. Why would it do that?
    • When it was really cold condensation in the oil sump (or somewhere in that area) froze and prevented the oil from reaching the head and valves which caused a distinct valve noise and a flashing oil pressure light. Fortunately I was only a few hundred metres from my home so I pushed the car back and let it sit until the outside temperature was above 0 degrees.
    • Yesterday the oil pressure light started flashing again but now I think it's the oil pressure sensor that's busted.

    Apart from all that it's a lovely little car :P

  16. Lupo 1.4 16V AUA throttle valve behavior

    in Car Care, Maintenance and Mechanical

    Posted

    Only reason I wondered about the Lambda is that there isn't any air mass meter, the air intake is controlled via the burnt gases so if your lambda is damaged it could cause bad fuel/air mix, however if it was fine and ran okay before this then it's probably not that.

    Looks a lot more like a TPS problem.

    I see. That's definitely something to look into. I'll check how much new lambda sensors are.

    Mine occasionally does that, where it revs up and down perhaps 100 revs every second. Rarely happens so not done anything about it.

    Mine does it when it's warm. I just found this thread: http://www.volkszone.com/VZi/showthread.php?t=398806

    right ... car is done and running sweetly again. Found more than one fault in the end so here goes with what we found

    First of all after doing a compression test we found that cylinders 1 and 4 were down on compression.We found the reason for this was the fact that the camshaft and followers on those cylinders were badly worn(pics will follow tomorrow).

    The head was replaced with a good 2nd hand item which had no signs of camshaft wear.

    Once the head was on and torqued we ran the vehicle up to temp ... it still had a slight fluctuation in idle at times... we found a tiny nick in one of the inlet manifold seals .... changed that and it ran much better ... there were a couple of fault codes logged in the ECU which needed to be cleared out .. which IIRC were that basic settings hadn't been carried out ,mixture adaption present and also that lambda control was on the limit.

    Once we had done the basic settings and changed the pre cat lambda sensor it drove like a new car.FYI the car in question is a 98 R Arosa with 33k miles.

    Hope this helps out with your car and gets you back on track

    Now I'm suspecting my camshafts or my head. I will do a compression test later today.

  19. Lupo 1.4 16V AUA throttle valve behavior

    in Car Care, Maintenance and Mechanical

    Posted

    Some of you might have seen my other thread about the extremely annoying throttle problem: http://forums.clublupo.co.uk/index.php?showtopic=73365

    If I push the throttle just a little bit and hold it in position the revs go up and down like a rollercoaster. I just had my gf record what the throttle valve was doing. Is this behavior normal?

    This is what it does when I just turn on the ignition

    http://www.youtube.com/watch?v=vipQghEjf3Q

    Engine start and at 0:15 light, constant throttle. Why isn't the valve doing what the pedal is doing?

    http://www.youtube.com/watch?v=Rqw5nQOO588

  21. Lupo 1,4 throttle problem

    in Volkswagen Lupo

    Posted

    This is what the car does...

    Youtube Video ->

    Original Video

    I've now replaced all the HT leads, the coil pack, the spark plugs and the air filter but there's still no difference at all. I spoke to a mechanic who suggested a new throttle body and I think I'm going to get a new one soon, but I don't think it will fix the problem.

    An intake vacuum leak still sounds plausible. Is there a way of checking this using the Vag-Com?

  22. What is this and what does it do?

    in Volkswagen Lupo

    Posted

    iv got one looks the same as yours not connected to anything except the black pipe and my lupo is also hunting on idle :confused:

    It's good to hear I'm not alone :) I stopped by the VAG dealer yesterday and let one of their mechanics have a look. He had no idea what this thing is or where it should be connected. Lupos are quite rare in Sweden and not so many people know a lot about these cars. If only I were to see another Lupo at a parking lot I would just need the owner's permission and 30 seconds to open the bonnet and locate the weird sensor thing.

    Have you read my other thread? http://forums.clublupo.co.uk/index.php?showtopic=73365

  23. Lupo 1,4 throttle problem

    in Volkswagen Lupo

    Posted

    Did you give the throttle body a thorough clean first, and then bolt it down REALLY tight?

    I gave it a thorough clean a month ago. That's when I discovered there was no gasket between the throttle body and the manifold so I made a new one. I will remove and clean it again on friday.

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