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?
View 1 RepliesI have a 2000 Jetta 1.8t. I am having a sudden boost surge problem. It seems no matter what gear I am in if I get on the gas when getting on the highway or whatever to just get up to speed in a reasonable amount of time, the boost just increases like crazy. I do have Gonzo Tune and know I should have a faster response but I have been in higher built mk4's and they don't do this.
I have done the following to try and fix problem and some cause it was just time to replace:
New MAF
New N75
Fixed Leaks
New Plugs
New coil packs
New Fuel Filter
I do have a boost gauge and when cruising my vac is steady. The sudden surge of boost goes to almost 20 psi. I have thought of replacing my wastegate actuator since I have heard that can be a problem?
My boost gauge is bouncing around during the flutter at peak psi? I have a apr stg 2 evoms intake and full tbe exhaust 42dd...
Here is a exact video of the flutter i am talking about [URL] ....
My 1.8 is having a stutter/hesitation in first gear when I first start driving. No cel besides a misfire in cylinder 1 that I got yesterday afternoon. The hesitation began well before that though. Researched the topic but could not find similar issues.
View 4 RepliesIs there a correlation between a Prius sitting in the hot sun and the computer malfunctioning? When I came out from a movie yesterday, the temps read 106 degrees outside the car. The emergency brake light was on, though the brake was off. I pumped the brake on/off a couple of times, but the light stayed on. As I pulled out, the brake seemed to engage, then disengage causing the engine to stutter and surge. The service tech today tells me the computer is not communicating and at 50,000 miles. Is it worth the money to get the new computer? Will the car be safe afterwards?
View 2 RepliesSituation 01 Jetta AEG 2.0L codes catalyst below threshold and random misfires.
•found exhaust clogged due up catalyst. It was actually making contact with the rear O2
-replaced cat as an assembly and reset codes with Ross-tech
• start up, idles perfect no hesitation smooth. Road tested it and upon entering freeway ramp at it started stuttering/misfiring
• CEL flashed for cylinder 3 & 4. Inspected wires found #3 lost continuity, installed new wires.
•road tested and same result but only 4 came back. Swap plug with #2 and retested.
• #3 and 4 misfire came back again
- shooting in the dark to identify which way to go with it I tested:
•compression was solid 140
•fuel pressure 35 psi at idle and 45 when snapping the throttle.
-Suspicious spec is 55-72psi
•squeezed the return line to inspect if the Fuel pressure regulator valve possibly leaking excess.
Psi never went higher than 45 at idle and throttle snap to wot
•graphed the tps signal smooth with out drops or glitches up to values of 84 according to toss tech scan tool
•looking at measiring blocks one item that was odd is engine load at idle 99.5%
-swapped parts with known good parts with a good running 2002 Jetta aeg motor.
•MAF -no change
•ignition control module/ coil pack no change
-today ill be checking fuel pressure at the fuel pump and inspect if the fuel filter possibly clogged.
Bought a MkIV for the fiancee 2 weeks ago (04.5 GLI 1.8T Automatic).. Great driving car, needs some minor love (really dirty, burnt out lights, etc)
After the first week, the coolant light came on
Had some G12 handy, topped it off (like 8-10 oz)
All good
2 days later, it came on again, added about the same amount
4 days later, it came on again, added the same amount
1 day later, it came on again, added the same amount
I am adding 50/50 mix, but haven't seen a puddle anywhere, Nothing looks wet, but then again its hard to see around the plastic cover ...
I noticed last week when I leave the house in the morning my car was leaving oil striped down my road. Jacked car up Saturday AFTER RUNNING TO STORE found a little oil on bottom of my car but not nowhere near what I was thinking there would be. Cleaned motor fired up found no leaks at all . However this morning after car had sat 20hrs or so I looked under car before I cranked her up clean.
Got it cranked her up and oil was streaming from the oil cooler. Not on the block side but towards the front of car side of cooler. It did this for a few seconds then stopped. I am gonna order new front and rear orings for oil cooler. I am just stumped why it only happens at a cold start and for a few seconds not consistently.
I installed a brand new "A line" 007 last night. Now I have ridiculous boost surge (15psi then to 5psi, then holds 11 hard) I did a N75 race valve last year (ECS), so I have my doubts that it is the N75. So what gives? The car wasnt that bad with a blown stock DV compared to this. I have minor mods: CAI, exhaust, Forge TIP, APR stage 1.
View 24 RepliesMy 2004 1.8T GTI is having a weird issue. It's had 3 coolant leaks in the past 3 months. Every time I get one leak fixed it goes leak free for a couple weeks, but then a new leak pops up in a new place.
First leak was a cracked coolant bottle. Second was a flange near the bottle on passenger side. The newest leak is on the driver side. Car hasn't ever overheated.
So I have an oil leak I can't figure out. 2001 jetta vr6 5spd. The bottom of the car is covered with oil. It appears to be leaking above the transmission. It will consistently drip at idle. Oil sits on top of transmission and then Leaks down over the starter. It doesn't have any coolant leaks. Is there anything anything in that area that could leak oil that bad?
View 11 RepliesThe past few days ive been having some boost problems. Boost will surge to 15psi then drop to 0psi and continues on acceleration. Coming from work today I was unable to get past 5psi accelerating
Then on WOT the boost would spike to 23psi then down to zero. Checked all hoses i could see and reach to make sure they were connected.
Mods:
Forge 007 DV
ECS Race N75 Valve
Turboback Exhaust
Chipped
Short Ram Intake
I've got a slight surge that's very noticeable cold and not so much after warmed, I can hear the turbo surging and feel a slight power increase on and off, checked with forscan the normal values, alls inline, I did not ck fuel pressure yet but will, I noticed vgt, boost fluctuates when this happens, icp ipr readings inline, this is a 04 with throttle plate inside the air elbow area, can this cause a surge and how to test this, I am not familiar with this setup as my 05 does not have it.
View 6 Repliesmy 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.
View 4 RepliesSo 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.
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
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.
View 2 RepliesI 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.
View 5 RepliesI 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] ...
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.
View 5 RepliesI 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.