GTI 337/20th Anniversary :: Boost Losing - Loud Blow Off Noise At Around 15 Psi
Sep 23, 2011
I got a 04 jetta gli that is making a loud blow off noise at around 15 psi. Up until then the the boost holds fine but then at around 15 psi it just starts whistling really loud and loses all boost. I recently replaced the DV and venthose by the camshaft, and made sure that it is tight. I also installed a 42DD 3" exhaust recently. The car has about 96k on it with stock vacuum hoses except for the aforementioned adjustments. I'm pretty sure it's not the hose and DV I replaced because I made sure that they were tight to see if that was the problem, and it did not fix it.
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Don't know if I'm experiencing the dreaded limp mode or not. It seems that SOMETIMES while just digging thru the gears 1-2-3, not hard, when I get to 3000 rpms it's like I'm taking my foot off the gas. Rpm drops from 3000 to 2500. It's like I'm losing boost or something. I have no mods and obviously, no boost gauge.
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This is my other question. I have an APR program and turbo-back billy boat exhaust. I installed a boost gauge that gets the reading off of the intake manifold (fuel regulator.)
So if I'm just tooling along, short-shifting and only using 1/10 throttle, and my boost gauge never reads above -5, let alone 0 or positive, why does my valve release pressure?
Why would there be pressure to release if there is a vacuum, according to the gauge? I wouldn't think that a recirculating or blow-off valve would work in reverse.
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02 GTI 1.8T ... Stage 2
Was running the car at about 4500 rpms in 5th gear. All of a sudden lost power and heard a loud whooshing/ hissing of air which sounded like it was coming from under the front passenger side of the car. Lost about 50% of power in all gears. What I screwed up and broke?
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Was driving when I heard a pop n my boost dropped. Normally run 17 psi but my boost gauge is now only reading it's pushing 4psi. There is no smoke coming out my exhaust or anything, when I had it scanned it read it was a bad pressure sensor in the inter cooler so I replaced the sensor cleared the code took it for a drive n the same thing happened...check engine light came back on n still running like crap.
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So whenever I put my car in reverse and back up my car makes incredibly loud and messed up noises. What's going on and if this is a major or minor issue? At first it wasn't as loud now it's head turning people at the mall literally stop and stare at me its embarrassing...
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I have an 04.5 jetta gli ... Mods are unitronice stage 2, eurojet tb exhaust, cold air intake, diverter valve, nothing else really.
So, whenever I'm driving alone my car is fine. But once I have a really heavy person in my car, or maybe 2 people in it, as soon as I start the car I hear a vibration. It sounds as though it could be my exhaust? Because before I had it installed months ago it would never do this.
Also, as I accelerate I feel and hear that it is bogging like my car is struggling to go fast and i do see some signs of loss of power. So is it the exhaust?
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When I turn my car on in the morning there is a really loud screeching noise coming from the car....It might be one of the belts. It does it for about 10-15 seconds and then it goes away and It doesn't come back until I let the car sit for a while and turn it on again... What it is?
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Car was great this weekend, then on saturday, every time I shift my car clunks right near the tranny when I release the clutch. Its a loud noise. Clutch was done around 2500 miles ago. South Bend stg 1 with a LWFW (I know, wish I stayed with a DM). And if I drive in first and second and come off the gas without shifting, it also knocks once really loud. It isn't a back fire or anything it almost feels like the dogbone mount is bad? Also, over 4000 rpm my car sounds deeper sounding than before.
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sometimes when i switch from 1st to 2nd or 2nd to 3rd i get a loud popping noise like my exhaust is hitting the under side of the center column. I have had the car on a lift and shook the hell out of the exhaust...it's not moving enough to cause that loud popping...so i figured it could possibly be the dogbone mount gone and the downpipe is hitting when i shift because the mount is bad?
Or could it be one of the other mounts...I'm going through a divorce right now and really really broke so i need to make sure i get the right one and fix it right the first time. What mount it is if not positive its the dogbone?
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When i turn my car in the morning it whistles very loudly then after it warms up for about a min or so the noise goes away..
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My car has been making a loud droning noise that sounds like I am driving a jeep with some mud tires on it, when I turn to the left it gets smoother and when I turn to the right it gets louder.
I assume it is the wheel bearings. Unfortunately I now live in an apartment with no garage and no tools so it is a pain to check. My question is, what do I need if it is in fact the rear wheel bearings? The whole assembly is easiest I assume?
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The A/C hasn't been working for a month now, won't blow cold air. Took it to the shop and they put 1.5 pounds of freon in it. But it still won't blow cold. I'm taking a 1200 mile trip in it soon and the shop isn't an option. There's no leak as of now. What to do?
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I have a mkiv gli. With 41k miles on it. And when I turn my wheels either way it makes a loud strenuous noise that seems like my power steering cause its only noisy when I turn.
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Okay so yesterday I got my turbo replaced! I drove it around town and some back rounds playing with the car and testing everything out and seemed completely fine. This morning i did the same and worked completely fine. THEN i go get a car wash. Right after the car wash my car was running rough for couple minutes and basically stalled out when i hit the gas. After revving it for awhile it was running smooth like normal. I brought it on the highway and once i hit about 5000 RPMS it seems to just lose power and not want to go anymore like the turbo is gone! But other then that the car runs and drives fine now! I have a 20th and its stage 2 if that makes a difference!
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I'm to the point of driving the car off a cliff! I've included a log of the car acting upt. The car is a 20th AE GTI AWP. It was chipped all it's life and ran like a champ. In November I installed a Frankenturbo F21T turbo kit, Bosch EV14 550cc injectors, 3" MAF, eBay FMIC, 3" catted exhaust, and a custom tune from Motoza. Dave at Motoza has updated the file 4 times and no matter what he changes, the car will boost up to the requested boost of 19psi and hold it for almost one second, then boost will drop to 12-15psi and then boost past the request to like 22-24 psi and go back and forth until the gear is over and I shift. Then it does the same thing in the next gear. i just want a solid 18-20psi without a manual boost controller! Things I have tried:
-Changed the N75J back to a NEW stock N75
-Replaced all the N75 vacuum lines
-Wastegate cracks at 7-8psi
-Replaced every worm feed clamp to a nice T-bolt clamp
-Boost leak tested to 18psi and found no leaks
-Deleted SAI, N249, and N112
-Unplugged MAF, nothing changed
LOG with multiple WOT pulls: [URL]...
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I have a 20th 1.8t. It was running fine last week but all of the sudden i was only getting about 4-5 psi. I have check all over vwvortex for somewhat of an answer. I have no C.E.L.. I have checked for vacuum leaks with nothing coming up. I tried to check for boost leaks but it comes out of the dipstick hole. I have undone and re-installed the pancake pipe. The DV is holding pressure.
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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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I have had this happen three times in the last two months. I was not hard accelerating, just cruising on the fwy at about 70mph in sixth all three times. Then for no reason, my rpms drop, no check eng light, no power for about 10secs and then, back to normal. I have had the codes checked twice, nothing recorded...
2004.5 gli .... 65k
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when the traction control is off my boost hits 18psi and there have been times where it was 20 psi. My friend said i probably have stage 1 software .
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Start with the basics, no CEL's, car has not cut out while driving and I've only had to attempt cranking up the car twice since I started noticing these issues about 6 months ago.
Symptoms: hesitation/variation in boost during acceleration- doesn't matter if I really get into the gas or just "normal" passing acceleration RPM's steadily climb, but just not as consistent or quickly. Also, the one that really has me really confused. With a 1/4 tank of gas or less, going up a slight incline (overpass); 70-mph-ish... acceleration dies off, rpm's slowly decline, and gas pedal doesn't respond for about 2-3 seconds. Car never shuts off, no CEL's, then everything is fine again! Even does it when I'm using cruise control. Car just rolled 110,000 miles
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