Golf IV / Jetta IV :: Losing Power And Boost At 4k RPMs After Tuning
I have a 2002 gti with an apt software tune. Whenever I'm on the interstate in 5th gear for a while. And I'll start to speed up. Once 4k kicks in. My boost no longer works when it normally pushes like 22psi. Then after slowing down. No matter what gear I'm in. It limits back to 10psi of boost and once I hit 4k. It goes super slow and boost won't work. I'm not sure what else I should get to restore my car to perform fully.
I'm currently on the factory ko3 turbo and the previous owner had nitrous hookups and lines to the motor.
I'm already 3k into fixing it. Needed new shift cables and a fresh transmission
I'm hoping to push about 250hp maybe 300hp
The boost problem is fixed once I turn the car off and back on. I just want it to work again without having to spend an arm and leg on parts and labor. My mechanic works at Volkswagen dealership. But isn't allowed to work on my car due to dealership policies about working on vehicles older than 10 years old. The guy who tuned my car professionally at an apr shop told me that I should get a smoke test done (idk where or how to do that) for my vacuum lines and that I have a cylinder 4 misfire. It may be a bad coil or spark plug. But I'd like to get some performance out of my car and I don't know what else or where to start.
Golf IV / Jetta IV :: Losing Power And Boost At 4k RPMs After Tune
I have a 2002 gti with an apt software tune...
Whenever I'm on the interstate in 5th gear for a while. And I'll start to speed up. Once 4k kicks in. My boost no longer works when it normally pushes like 22psi
Then after slowing down. No matter what gear I'm in. It limits back to 10psi of boost and once I hit 4k. It goes super slowe and boost won't work
The guy told me that I should get a smoke test done (idk where or how to do that)for my vacuum lines and that I have a cylinder 4 misfire. It may be a bad coil or spark plug. But I'd like to get some performance out of my car and I don't know what else or where to start. I am new to this.
Golf IV / Jetta IV :: Losing Boost / Power At High RPMs In High Gear
2003 jetta gls 1.8t 5spd - gts stage 1 tune(gonzo stage 2)
tt 2-1/2" downpipe with high flow cat
turbo smart splitter valve(set to divert only)
turbo inlet pipe
homemade intake with k&n filter
stock n75 valve (f)
So in first through 3rd gear my car gets 20psi of boost then at 3,500 ish rpm smoothly starts to lower down to 15psi. but in forth and 5th gear the boost drops faster, enough so the diverter valve actually opens. then the boost will bounce up and down, around 15psi. the car still accelerates but with obvious power loss.
Is my diverter valve not "firm" enough? it is adjustable, so I've tightened it as much as it can. it doesn't seem to change anything. it came with spring spacers to make it tighter, but I haven't tried that yet.
Is it something with the tune? not enough fuel, need bigger injectors? The problem is only at about 100mph, so its not a big deal. I would like to get it straightened out if possible.
Golf IV / Jetta IV :: Transmission Clunking - Losing Power During Takeoff
I have a 99 Jetta MK4 2.0L. I purchased it last month and have been having issues since.
First it was the coilpack that made my engine bog.. (at the time, my transmission was also clunking into gear, getting stuck in gears etc.) changed coilpack and it went away.
Then I had issues where the car would turn, but not start. Changed the Crankshaft Position sensor.
All was good again, then my transmission started to do the clunking (but no getting stuck in gear) and then i started losing power during takeoff.
Then it got really bad, I got home and tried to start it up again, i can floor it on the gas and the car will studder and bog out for a good 3 seconds, and then slowly accelerate into gear.
Some points i was in neutral trying to rev and it was bogging then also.
Btw, coilpacks were changed, all o2 sensors were changed, and the spark plugs have been done recently. Pulled codes,
- P0422 Main catalyst efficiency below threshold
- P0103 Mass or volume air flow circuit high input
- P1127 Long term fuel trim be system too rich
- P0715 Turbine/input shift speed sensor circuit
Also tested driving again, bogged out initially then started to move. Checked if i could get past 40km/hr and i hit 60km/h. After driving a little bit it seemed to be a little bit more responsive, but still boggy.
Golf IV / Jetta IV :: 2005 GTI Losing Power To Fuel Pump
I have a 2005 Volkswagen GTI with 80k miles. Just yesterday I went to school and the car drove fine. But when I came back and tried to start my car, it stalled out after a few seconds. Now I thought this was a bad fuel pump until I checked it and found that the fuel pump wasn't receiving any power. I checked the fuse and it was intact. So then I went to check the relay and found that if I unplug the relay and plug it back in, the fuel pump momentarily receives power for about 2 seconds then nothing. Any clue what the interference could be?
View 1 RepliesGolf/GTI VI :: Losing A Little Boost At Higher RPMs
I have been looking around for some boost information. I have come across a few threads that have boost graphs, but the images are no longer available. I have tried to get a hold of some of the posters, but no luck.
I only recently hooked up a boost gauge and have been monitoring my boost more. I had a slight feeling before I hooked it up that I was losing a little boost at higher rpms. Between 4500-5000 my boost drops from 18 to 15 and then from 5000-6000 it drops to about 10. I know it's sometimes normal for boost to drop at top end, but I'm not quite certain it's supposed to be that much.
I installed the Spulen Boost Pipe Kit hoping it may make some type of difference, but it's the same. What it might be? I have checked all my pipes as best as possible, but couldn't find anything.
Elantra XD (2001-06) :: Losing Power After Logging 250 Mi / RPMs Also Become Erratic
I'm currently moving cross-country from LA to St. Louis. Had routine maintenance done b4 I left. I've only made it to New Mexico so far b/c my car is losing power after logging 250 mi. RPM's also become erratic. Doesn't completely stall, but won't let me go more than 45mi/h. After a rest break, the problem doesn't re-create.
At my first mechanic stop, the computer checked-out as ok. That mechanic changed the spark plugs and also told me the 2004 has no fuel filter (fuel filter being my suspicion of what was wrong).
Today it lost power again. Jim Bob at a rural garage said maybe the alternator or fuel pump. I have an appt. at Pep Boys tomorrow, as the dealers don't have any avail appts. until Fri.
The contents of my apt. are in the trunk and backseat. Is it worth it to remove them (to get to the fuel pump) at the cost of another hotel day, or should I limp home at 250 mi. a stretch?
Golf IV / Jetta IV :: 1.8t Rattles And Struggles To Accelerate - Brief Power Loss At Low RPMs
The past couple days when driving to school in the morning i've been noticing that my car starts to rattle and struggles to accelerate once I pull out of my driveway. Once i get to the next stop sign to take off the car runs fine like nothing ever happened. My check engine light doesn't come on though. I usually let the car sit for about 30 seconds to a minute before i start to move the car. Mods I have are Unitronic stage 2, Forge 007p DV with yellow spring, and 3" downpipe.
View 1 RepliesJeep - Compass :: 2010 - Losing Power / Hard Acceleration And RPMs Go Up
Our ABS light, anti-skid light, and engine light are on. The light came on when 3 year old son hit it. It just never went off. Dealership hooked it up to diagnostics and said we needed to spend almost 500 on a new ABS system. ALSO, at the same time, the car now sounds like its working very hard to accelerate. The rpm's go up, but there is no additional power. Is this connected to the ABS problem, or is this a transmission problem? Took it to a mechanic and he didn't check the transmission. After talking to him, he said it could be the transmission.
View 19 RepliesGolf IV / Jetta IV :: Chokes The Power Past 3500 RPMs And Continue Running Rough
I own a 2001 Jetta GLX 12v VR6, lately the car has not been running well. It chokes the power past 3500 rpm's and will continue running poorly and sound sort of like a Subaru boxer engine. Sometimes it corrects itself and runs okay but goes back and forth.
I ran the codes on VAG COM:
6 faults found:
17551 - Load calculation cross check
P1143 - 35 - 10 upper limit exceeded - intermittent
16712 - Knock Sensor 1 (g61)
P0328 - 35 - 10 Signal too high - intermittent
[Code] .....
I ran VAG COM a couple of days before these codes came up and I had a different code dealing with air/fuel mixture, something about fuel running to rich. I'm stumped.
Golf IV / Jetta IV :: AC Quit Working / Coolness Losing
Out of the blue, months ago, the A/C quit working. I rarely used it prior so I can't say for sure if it was losing "coolness." It may have been. And other than hearing a slight hum or whine after turning the compressor off, which it has done since almost new everything was fine. Although it did, recently, before the A/C died, begin to overheat while waiting in traffic. Never did it again.
I have not done a bunch of troubleshooting other than adding some refrigerant and monitoring the fans and A/C clutch to see if they cycled, which they did not (assuming I was reading the fan process accurately). The gauge did read low, I filled it to the green zone, the compressor clutch engaged, level dropped, I added, it cycled, then dropped, all the while still blowing hot air. I quit doing that but it remained on the low side of green.
The car has 180k miles and runs great. I'm getting ready to sell her after 11 years but really need the A/C working to get anything out of it in the South.
Golf/GTI VI :: Car Randomly Losing Power / Throttle
Over the past month I've had an issue with my car randomly losing power/losing throttle. When this happens the car acts as if its lost power, and I have no throttle at all. That said everything electronic on the car is still on in terms of radio, heat, seat warmers, low beams; but on the dash the battery indicator is illuminated. The way I've found to "fix"this is either to brake and pull over and put the car in park and restart it, or while moving shift into neutral and push the key forward to "start" the car again. I've also had this happen back to back, meaning that I restart the car and when I go to accelerate the throttle cuts out and the car acts in the same fashion where it dies and I have to restart it again. The times this has happened there hasn't been any sort of common factor attributed to it and honestly I'm at a loss for what could be causing the issue. The car does have an APR stage 2 tune but other than that nothing electronic really done to it.
View 2 RepliesGolf IV / Jetta IV :: RPMs Jumping And Car Is Stalling
I have a 2001 vw jetta 2.0l manual. When the car is running the rpms jump up and Down from about 300 rpm to 900 rpm and I guess that's why the car will stall out every time I press the clutch to stop. Also the car won't run with the MAF plugged in. If the MAF is plugged in it will drive but will not idle the car will just stall.
View 16 RepliesGolf IV / Jetta IV :: Rough Idle Between 600 - 800 RPMs
My golf 2.0 vw isn't doing so good right now. It has 227000 miles on it. It has been driving great, and then last week it started to idle rough. It idles between 600-800 rpms. it fluctuates between 600-800 rpms. It had the check engine light on before this happened i was told by my brother that it was an 02 sensor. I had it checked for what is causing the engine light to come on today at o Rileys, and it came up with 11 codes. Some of the codes where 02 sensors, it was running to rich, needed a new computer, evaps system, fuel pump, fuses, coil pack, spark plugs, It shakes when you sit in it when it is idling like not a bad shake but a small one you cal feel, l'm including a video of it running.
View 6 RepliesIntrigue :: 1998 - Losing RPMs While Driving
I have done a extensive tune up on my intrigue, I have been having a problem last six months or so with it losing rpms while driving, idles fine and only loses rpms while foot is barely on peddle, If I give it more gas jumps up to normal, what may be causing this?
View 1 RepliesGolf IV / Jetta IV :: EPC Light Has Come On - Car Will Idle At 1200 RPMs Up From 800
Recently I believe i got a tank of bad gas. Was having problems starting. Finished it off filled up used injector cleaner and dry gas to clean it out a bit more. Now as I was driving the car would basically stall out but kick back in as I was driving and the EPC light would come on. I've been reading up and most answers are a bad coil pack. I pulled them all out and checked them they all look pretty good. No codes are popping up for it a coil pack. Unless I need a specific VW model computer to check. I'm gonna check the volts on the coil packs today to see as well.
The EPC light does go off after the car sits a while. It comes back after a few miles driving. After the EPC light comes on my car will idle at 1200 RPMs up from 800 when its normal.
Golf IV / Jetta IV :: Rough Idle - Smoothes Out Only At About 600 RPMs
The problems seems to be getting progressively worse, it has a rough idle and when it smooths out is only at about 600 rpms and still sounds strange. Also, I am running extremely rich, blows flames quite often and in OCMD I went 100 miles on a half tank. Car is stage 1 unitonic with sai and evap deleted. I changed the maf and that didn't change anything. I was searching for vacuum leaks yesterday and noticed that one of the vacuum caps I have on the bottom of the intake manifold was dried out so I took it off so i could put my finger over it and see if it ran better, when the cap was off it ran great but when I put my finger over it it would go back to an awful idle Now when I come to a stop it will sometimes drop the rpm so low that it shuts off, when I am driving you can't tell a difference.
View 1 RepliesGolf IV / Jetta IV :: Slight Vibration At Idle And Low RPMs
1.8T Car only has 73k on it.? When I am sitting at a stop I can hear a vibration sound coming from the engine bay. It goes away as soon as RPMs hit about 2000. My best guess is old, worn out engine mounts.
View 6 RepliesGolf IV / Jetta IV :: Engine Whine At Above 4000 RPMs
I've had a weird problem pop up within the past few weeks. My engine seems to have a noticeable whine above 4000 RPMs. It sounds almost like a supercharger whine, but my engine is completely stock. Possible problems I found online include exhaust leak, vacuum leak or tensioner issue for the belts.
Another issue I have had is that whenever shifting into second gear, I have some difficulty getting it into second gear. It makes a scraping sound as though the clutch is not disengaged all the way. On occasion, I have also had the shifter kind of pop second gear out when continuing onto third or even feel like it is rejecting second gear sometimes. A friend of mine told me that the scraping sound is normal and, "that's just how manuals are." Doesn't seem normal to me especially since it is every time I shift to second gear.