Golf IV / Jetta IV :: Cannot Hold Boost And It Fluctuates All Over The Place
Dec 4, 2015
My car is a 2001 Jetta 1.8t. the car is bone stock, I can not hold boost and it fluctuates all over the place. the dv sounded like a flutter until I bypassed the n249 now it sounds like a steady pssh. car still would only make 4lbs of boost and drop to 1-2lbs after 3500rpm. I pulled the line off the n75 to wastegate and did a pull. it boosted to 8lbs spiked to 15 and held 4lbs, if the tires spun it would spike to 12-15lbs and drop to 4 again. I replaced the n75 today and now will still spike high if I spin, with traction boosts about 8lbs which I believe is stock but then drops to 1-2 lbs then up to 4 down to 1-2 sometimes up to 6, it seems random. I also pinched off the dv to see if that was the problem but same thing.
I'm wondering how my car could lose boost with the wastegate actuator unhooked, I can not find a boost leak(not saying there isn't one, but haven't found one), the car holds more boost with the n75 unplugged and under acceleration, with n75 plugged in it seems like 3 surges per gear?
Car throws one code p1473 its an evap code.
The wastegate sounds like its closing when I pull the rod and let it go, lots of tension on it.
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I own a 2004 Jetta 1.8t, about 6 months ago i had an oil leak problem and a cracked vacuum line. i fixed the oil leak and fixed the cracked line with 034 motor sports pcv hose kit. I snapped 2 more vacuum lines and repaired them with rubber hose. p0300, p0301, p0507, p0171, p0303. Are the codes I am currently having actually have had them for just over 6 months. I've replaced all plugs, I've upgraded to ecs tuning 2.0 coils. No fix, went back to oem coils which I am using now. It runs pretty good until i clear the codes. Then idles all over the place and the boost gauge bounces all over.
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yesterday got the car tuned. Stage 2 APR, it's a 1.8T 5 speed and I only have 2 real issues with the tune.
1. They forgot left foot braking(I think I can call APR to have this sorted)
2. When accelerating hard and shifting a gear, no matter how you try it will not hold boost through a gear changed. Turning off ASR improves this greatly but it still purges pressure and as a result the car falls flat on its face. Then it spoils up and same thing in the next gear. Trying to hold wide open throttle through a gear change does not work as I believe it feels like the pressure plate isn't able to engage fast enough. It is a full on loud pshhhh purge could a possibly higher PSI Diverter Valve fix this.
No other APR car I've driven does this (given they were MkV and MkVI). I'm not quite sure what is different with the motor unless the stock Diverter is strictly for economy and as soon as you don't need boost it purges? Not really sure
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So i decided to be a man and finish my 3.6vr in my gti project. Filled the coolant system with g13 and let the car run for a good half hour but the temperature only went to 130 degrees and would go back down to 120 and back to 130 and back and forth. With the heat turned on it was only slightly warm. Top hose was slightly hot and the bottom hose was just warm. So i tried massaging the hoses some more to let any air out and saw no bubbles. So i decided to go for a drive around the block and temps still stayed the same. So i'm leaning towards a thermostat but the motor was pulled out of a running passat with no problems.
Also its a brand new oem temp sensor
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I am running the GIAC X+ 93 octane tune with a cold air intake and when i hit full boost it fluctuates from 20 to 15 through out the gear. i am guessing its because of my stock dv. im looking in buying the eurojet dv.
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I opened up my hood and now it doesn't close... it seems like the latch isn't locking into place and holding the hood down. I do a lot of car work myself, but after countless hours of trying to figure out why my latch isn't locking shut, I give up. I am planning to take it to a local dealer after I schedule an appointment, but that means that I can't drive for a few days... maybe weeks if they are booked... I don't want the hood to pop up on the highway or anything.
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Car won't hold an idle unless I'm on the gas, and even then it only goes to 500 rpm and the second I let off the gas it dies. It also will not go any past 500.
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My 2014 Accord i4 CVT has 7000miles and it has acted a little strange ever since I pushed it to 3500rpm at Sport mode and then I maybe abruptly shifted it to Drive mode, at which point it made some whining noise shortly. But don’t get me wrong, acceleration was gentle and I don’t ever beat a car.
Since that incidence, it idles at 1500rpm upon cold start at P and fluctuates between 1000rpm and 1100rpm after it warms up a little bit (still in Park). When on stop (brake) on D, it has slight rough idle that periodically comes and goes, which gets better when the A/C is off but not completely resolves. Acceleration is sluggish and lagging, and it has some “dragging/sluggish” feel on coasting as well. When braking, it takes more effort and brake feels stiffer as if it lacks some break boost. Also, the electric power steering gets heavy/tight (I think this could be more of a sensor/input problem rather than the motor).
All these symptoms come and go together except for the fluctuating idle upon cold start, which is persistent. Gently pushing gas at 1200 rpm for, say 10 seconds, tend to “free” the tight steering wheel, and car starts to act more normally with better coasting and acceleration, and more responsive brake for a while. And problem comes back. Also, turning off the A/C seems to make the car act behave notably better but I am cautious of this point since it is known that Honda’s A/C system really takes away the engine power.
I had the dealer shop check for vacuum leak. The report says “check idle, check idle control, check for vacuum leaks ok, check or any codes, checks ok”, basically saying there is no vacuum leak. But I think it is still possible that they missed something. Dealer shops and some independent shops I visited aren’t so willing to figure out what is going on, and I basically need to ask them “check this and check that”.
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When I give my car some gas my boost gauge fluctuates a lot and doesn't hold, I have an OEM piston style dv revision d I believe, and I have a catch can and also a blow off valve, and I'm stage 2. I was thinking of getting an awe diverter valve?
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I have to pull up really hard to get the parking brake to hold. If I'm on a hill forget it, I yank up really hard and then leave it in gear just in case. I have installed new cables and pads. I have also have the lever adjusted so it starts to catch when you pull it up about 2-3 inches. I've never driven another mk4 so I don't have any other reference to how well the parking brake should hold but I would think that I wouldn't have to pull up this hard to get it to habe any real holding power.
Any other vehicle I've driven with a hand brake I could easily lock up the rear tires. I'm lucky to get mine to lock while pulling so hard I think I'm going to break something. I've searched around and have only come up with threads about replacing cables and adjusting the lever. I couldn't find anything like the problem I'm having. Is this normal operation for a mk4 or is there something wrong with my calipers that needs to be addressed? My regular brakes work fine and the parking brake arms on the calipers allear to be functioning properly. They contract then spring back on their own
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I picked up a 2004 GTI not long ago for pretty cheap because it had a few issues. I am working my way through them. However, having 3rd gear issue.
All other gears are perfectly fine but there is way less play in the shifter in the 3rd gear position and I have to hold the shifter in position until the clutch is engaged (pedal up) to avoid the gear grinding. Once the clutch is engaged it stays in 3rd gear fine. It doesn't matter if I am moving from 2nd to 3rd or 4th to 3rd. Same deal. I have aligned the shifter several times using to proper procedures with no effect.
It never grinds 3rd with the clutch disengaged (so the synchro is fine?) and it will bang shift no problem. Oh and the clutch is less than a year old. It was installed by a shop before I bought the car. It's not really a big deal, but I would like to fix it. If I have to swap the trans that's fine, but need to figure out if it is a trans or linkage issue first.
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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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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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I just got done with a complete engine rebuild on my 02 1.8t jetta, had everything hooked back up and went to start it for the first time and it wouldn't. I went back looking for loose connections, nothing. Worked and banged my head for a day or two, I had fuel and spark but couldn't get it to fire. Finally I "choked" the intake to see if it was getting too much air and it fired right up. I unplugged my map sensor giggles and it starts up perfectly. I then hooked everything back up and what do you know it starts up and runs fine, but if I plug the sensor back in it kills the motor after about 10 seconds of running and won't start until I unplug the map again.
Car runs and drives but wont boost over wg pressure but that's probably because sensor itself is unplugged. I just wanna know what could cause it besides the sensor itself being bad. I ordered a new one waiting for it to get here (hoping it fixes the problem).. And I'm talking map (manifold absolute pressure) not maf (mass air flow), just in case people are confused.
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I got a Mk7 in October and my Mk4 has unfortunately been parked since. I started it and let it idle to warm once a week or so when I went on Vacation for 10 days. Before going on vacation I moved the car and after warming up everything seemed to be normal. Unfortunately I neglected it once I got back and haven't started it since the beginning of December. I'm selling it here soon and so went out to spruce her up tonight and upon trying to start the battery was dead so a buddy came over and jumped it.
It started right up but immediately was idling funny which I assumed was because of the cold (it's 25 degrees F tonight and has gotten in the negatives in the past few weeks due to snow storms). I shut it down and checked the fluids which were all pretty low especially the oil due to a small leak. So I topped off the all the fluids and started it again and let it idle to full warm.
I decided to take it for a drive around the block and it was still driving pretty rough, no knocking or anything but the engine was "sputtering" and the CEL was on and flashed when I gave it gas. I'm running stock boost so my gauge usually reads around 12psi but is now only going up to 3-5 psi and the vacuum is only at -15 which i think used to idle at -20. I drove it to the gas station and filled it up from a little less than a half tank but it's still running the same and there's a slight burning smell from the exhaust.
I was worried it was my turbo but it was perfectly fine a month ago. I was thinking of throwing some Seafoam or Heat.
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