Golf IV / Jetta IV :: On Stock Valve Car Would Get Random Boost Surges
May 29, 2015
I have a 05 GLI and I noticed that on the stock "E" valve my car would get random boost surges. I would barely tap the gas and the boost would build up to 8-10 PSI so I bought the J valve thinking it would solve the problem and just installed it today. I took it around the block and really liked how the power delivery became smoother and the car didn't have any boost surging issues. When I decided to put my foot down I noticed my car was only getting 11-12 PSI throughout the whole power band. Before on the E valve I was getting 16-17 PSI. My car's running a Unitronic stage 2 tune btw. I know upgrading to the "J" valve is a hit or miss but I think it's kind of odd that the car drives smoother but isn't running as much boost. I like how it feels for daily driving but something doesn't feel right.
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I have a very very strange thing happening in my 2004 vw jetta 1.8t. at random times the car will lose boost and throttle response. I am not sure what it could be I have replaced quite a few parts and it still happens.
No matter what speed or how much boost the car will just drop pressure and the throttle goes numb. For example I will be cruising on the highway around 80 on 0lbs of boost or a few and then the throttle just quits, at that point I can push the throttle to the floor and no response.
To fix it I have to lift my foot off the throttle completely and then go back on to rebuild boost or pressure. There is no pattern on when it happens, its happened from 10mph to 90mph and it happened ins 8lbs of boost or in vacuum. When I lose boost or pressure the boost gauge drops the needle to the bottom of vacuum at like 30.
Things I've replace:
- diverter valve
- n75
- throttle pedal
- checked throttle body sensors
- replacing maf this week
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I have a mk4 1.8t Gti. Recently I have been having issues with idle and boost. I read the codes and multiple random misfires in all 4 cylinders came up, idle control and the crank, knock, and o2 sensor came up. Shows that system is running to lean as well. I changed the spark plugs and wires, check the coil packs they where done about 1k miles so I expect them to be perfectly fine. When I clear the codes it idles below 9-8k rpms. I also noticed the breather hose coming out of the valve cover into the EGT has a hole melted into it, could this cause any of my issues?
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AC smells terribad sometimes. So bad I'm embarrassed to have guests in my car. The in cabin air filter has been replaced (supposedly) by the shop several times, but the smell is still there. Is something dead in my AC?No way to turn off side air vents. If I turn on my air, hit the feet selection button, air still comes out of my driver and passenger side air vents, but not the center. Is this normal?Odd clicking/churning sound from inside dash when selecting different air settings. DSG recall done 20k ago, but still random surges of power when downshifting to a stop. Also random jumping when shifting from N to D. Now this one really concerns me, at speed (50-80mph) there is a repeating chirping sound (like: reh-reh-reh-reh-reh). Its speed of chirp is proportionate to my driving speed. It seems to be coming from the wheel area, maybe the passenger it's very hard to tell. It doesn't happen all the time, but it will always happen on long drives at speed, 30+ minutes of 50-80mph. I even made a video, it takes a bit but you can hear the difference in sound when it kicks in.
[URL] .....
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I am just wondering at what revs the stock intake manifolds are meant to switch over as i think mine is stuck and not moving.
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I have a 2003 volkswagen passat, front wheel drive with a 1.8t. I was told that I could get more boost out of my turbo without having to do any major modifications. Is it possible or not. Because as it stands right now I am completely lost when it comes to this.
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I have a 1999 toyota tacoma 70,000/mi. While idling, at random intervals, truck surges forward. Have to stay on the brake. Cannot drive in winter. Took to Toyota dealer and other mechanics... described problem and that A/C seems to be on all the time. No one has been able to fix. My brother disconnected the A/C and surging has stopped, but I need a better fix that will allow my using AC.
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How accurate is the stock boost gauge on 02 wrx? is it a real boost gauge or is it just for show? 3000gt vr4 has one, but it is not a real one and work with maf sensor only. also is stock bov good for 15-16 psi. we have a stock 02 wrx and we are thinking to up the boost to about 1 bar, but not sure i can trust the stock boost gauge. the car also has catback and cold air intake on it.
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What are some of the limits of the gt 1zz engines like boost and stock lower end limits? Are like new rods and Pistons ok to upgrade with the stock crank? What can the crank take hp wise. What are the engine common issues? Celica GT 00-06 ....
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I have a 2007 jetta city with the single DIN radio (stock). I would like to have an aux input or usb input. I would like to know what would be the better option? (I don't want to go aftermarket). I know that there is a lot of option but I don't know witch one will work on my radio. (no pre-wired cd changer, no satellite).
Also, on the bottom right of the radio there is two kind of blank plugs (circle and rectangular). It looks like a usb and aux input would fit right there. I saw a picture in witch someone as the exact same radio but with a usb input (instead of the rectangular thing).
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I have an 03 golf with the double din tape/cd player and what appears to be an amplifier in the hatch on the drivers side.
While driving to work on monday it just suddenly got silent mid song. I tried changing the station and popping a cd in and nothing....
Also have tried turning it on/off... Anything else I can do? The deck functions normally but makes no noise.
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I wanted to get a blow-off valve for my GLI but its bone stock, i was wondering if its possible or if it would cause problems. and if i can whats a good brand?
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my car into VAG COM and since then it hasn't boosted past 4 lbs. it has Revo stg 2, K04, aftermarket side mount, full exhaust and a couple other bolt ons. Before the car was spiking at around 23/24 lbs. after pressure testing the system I found that the turbo inlet pipe was lose, so I tightened it. Still no change. I tried holding the battery terminals together for 10 minutes to reset the ecu and I also tried clearing the codes through a handheld code reader. No codes even come up anyways for this. The car is a 1.8T.
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Just wondering, what the max boost rating on a stock turbo, stock engine in a 2011 is. I know the gauge goes up to 40 PSI, but I don't think I've ever seen my go past 20.
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So my 2001 1.8t Golf is having some issues holding boost. I have a Gonzo stage 2 tune, CTS FMIC, Forge 008 Diverter, Silicone inlet and MagnaFlow Exhaust. I've also done the whole Evap, SAI delete and installed a catch can.
Starting in 2nd or 3rd at WOT the car spikes up to 18psi and then progressively loses boost throughout the rev range. Close to redline the boost drops to 5 psi or so. It seems to be dependent on the revs. In fifth gear the car holds 18 psi much longer as the revs don't increase as fast.
There are no CELs. I've done multiple leak tests starting at the air box and plugging the pcv/catch can system as well as at the compressor side of the turbo. None of the tests revealed a leak anywhere in the intake system. However, when I stuck my ear very close to the valve cover I could hear what sounded like a very small air leak coming from inside the valve cover. I took a look at the wastegate actuator and it seemed fine, no play in the rod, no loose bolts and to move it just requires enough force to compress the spring and it returned to its original position.
My thoughts are that it could be a fueling issue or turbo in the process of dying maybe.
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Just noticed today that I have a slight drop in boost. Normal boost is 1.5 bar but today it is running slightly lower boost and does not have the same pull through all the gears.
2001 mk4 1.9 tdi golf
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I just recently notice a whistling noise when I hit boost. I'm not sure but it sounds like it is coming from my gauge. I'm not losing boost pressure. I do have a glow shift gauge. The most recent install was the TIP which I clamped on to the turbo but I'm wondering if it isn't on tight enough.
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I was riding along today everything running fine then I came to a stop sign and when I pulled off my car wouldn't run 10 psi of boost it was only running 5 psi so I when to a buddys checked everything over and all my piping looked fine so I went up the road and everything was fine so when I started going home it did the same thing pulled of shut the car off pulled off and it was fine again.
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I think my stock DV is going bad, my car makes a weird noise under boost?
1. Only happens when first starting the car after it has been sitting for an hour or a few. (not overnight)
2. Does NOT happen when first start in morning.
3. Goes away after like 5 minutes every time and the normal WHIIISHH sound comes back like it should when I step on the gas.
4. It does not make the sound at idle.
This recording I made was of my car being revved up after it sat for one hour.
[URL] ...
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Replaced my coil packs/sparks, and just got around to changing my N75 valve today. The rough idle issue is gone but now when I go WOT it boosts but goes from 15psi-12-13-12-14-12...etc. I've checked and there are no boost leaks. I do have a CEL saying I need a new bank 1 sensor 1 Oxygen sensor. If it is that, why did this problem arise as soon as I changed the N75 valve and wasn't present earlier?
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I was having an issue with my car not going into boost so I plugged my code reader in and it had 2 codes 1 was p1200 n249 malfunction and the other was diverter valve malfunction so I did the quick easy one and got a new factory diverter valve but it still doesn't go into boost and still reads p1200 n249 what do I need to replace or should I do the n249 bypass it's a bone stock jetta 5 speed.
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