Golf IV / Jetta IV :: When MAF Is Plugged In, Boost Cuts Out And Goes Into Limp Mode
Sep 25, 2015
I currently own a 2001 Jetta 1.8t. It is currently tuned for 15 psi supposedly. I have never seen that number been hit and the highest it will go(only in 4th and 5th gear) is 13-14psi on a good day. And even when it does get there it does not hold the boost what so ever. It will start losing boost almost as soon as it reaches those numbers. Another thing is my MAF is currently unplugged and is making my car throw a code. When MAF is plugged in it cuts out boost and goes into "limp" mode.
Here are some engine mods that may be apart of this issue:
- Front mount intercooler, full intercooler pipe kit
- Oem diverter valve
- N75 j valve
- ACHTUNING tune on 15 psi not sure which stage
- Forged turbo inlet pipe
- 032 motorsports crankcase breather hose conversion
- Ecs tuning
- 2.0t coilpacks and mounting plate
- AWP head
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My Jetta mkiv transmission went into limp mode recently. Took it into shop. They checked it out and they replaced solenoids as well as the TCU. Car still goes into limp mode. It doesn't happen all the time but enough to piss me off. Any thoughts?? Car only has 140000 miles.
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03 manual goes into limp mode with ac on like turbo has no power and wont go past 65. No engine light comes on though. Does engine light have to come on to go into limp mode??
I don't have Vag Com. But i'm familiar with diesels. Maybe something is losing vacuum when a/c comes on because i know the ducts and all that work off vacuum in most cars. Does the ducts for TDi work off vacuum also??? Maybe not enough vacuum going to VNT activator?? I'm clueless with these cars.
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New to the jetta (used to own Saabs so not new to issues) OK, 2003 jetta 2.0 CEL is on for the CAM Post sensor. Car is in limp mode. has been for a while before I touched the car. I have replaced the Cam post sensor, I replaced the Crank Post sensor, replaced the coil pack, replaced the water pump and the timing belt. I have searched a lot of the other threads before posting this one. Triple checked the timing (3 people did not just me) I replace all the other stuff because I had codes the water pump and the timing belt just because they were due. i had one last code P0343 so when i replaced the WP and the TB i replaced the sensor. Still in limp mode, still have the code i pulled the plug on the Cam post sensor. then i said to my self this car should NOT start. but it did start and i drove it around a little, shut it down and car started up again so I am at a complete loss.
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I have a 02 Jetta TDI, I have had the car
For about 8mo, and have been fighting a random limp mode problem the whole time.
I have gone thru and changed the common issues, N75, MAF, actuator on the turbo, and changed all the vacuum lines, fuel filter..... Etc. I'm to the point I want to light the car on fire, and see if the engine light goes off!!! Is there something that I have overlooked.
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Having trouble with car going into limp mode or just not boosting at all. Tried some basic things to fix it, plugs, coilpacks, tune, none have work.
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2001 Jetta 1.8T wolfsburg
When I start my car the ASR light is already on and I cannot turn it off by hitting the button. It's just permanently on. Then as I start to drive and step on the throttle and get above 3000rpm the ECP light turns on and my car goes into "limp mode". Then in idle the engine stutters and RPMs go up and down, up and down. I'll turn off the car and the ECP light disappears but comes right back on again after getting above 3000rpm.
Thing is, these issues only appeared immediately after the following:
-Disconnected and reconnected CCM (checking for faulty wiring, battery was connected during this)
-Disconnected battery terminals for 3 minutes and reconnected them (no key in ignition)
Did I cause an issue by disconnecting battery?
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I have a 2004 1.8T AWM auto tranny Passat with APR chip. CIA, Bolt down Coil Packs, Bosch F6DTC plugs, OEM cat to straight pipe to magnaflow muffler, N75J, Forge DV (not the 007).
I installed a MBC bypassing the N75 to keep the spike at 16psi and hold (the n75J i spike at 22psi and hold 12~14), When I did that, the car will go in limp mode from 'over boosting'. I have to turn the MBC down to 9 to keep the car limping out. I love the way the MBC have the boost curve (the N75 is too passive for me). would like to fix this issue.
Also, with the N75 and or MBC, while in the APR 93 oct chip mode, I always get surging in 4th and 5th gear. Any time the boost is over 10psi, it is like I have tons of boost, but the engine is not using it. APR said it is the tranny, the tranny shop said it is the engine or computer, the engine shop said it is the tuning.
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Was driving the other day and one of the couplers came loos and I lost boost and went into limp mode. I pulled over, got it reattached, and after that it would only hit 10 lbs. i have a KO4-001 with the GIAC file and it usually hits 20+ and holds 20 lbs. I have a regular code reader and I had a code for the EBC, cleared it, rechecked the hoses, and verified with the flash loader that I was on the correct file, but it is still only hitting 10 lbs. What else I should check.
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There ended up being 6 or 7 codes. Originally the first O2 sensor and wire seemed to go bad, I replaced them and it ran well for a couple days and then started running like ass again...Now there are a few codes, none for the 02 sensor, but for over boost issues...Does this mean my n75J valve is causing the problems? Is it possible that my software is just going bad? ...I bought the car somewhat molested and don't quite know the extent of the parts on it, nor the brands( specifically, the software...).
The current codes being thrown:
P0238 mani pres g31 sig to high
P0234 overboost
P0106mani barometric sensor g31
We replaced the manifold pressure sensor, and am not having the issues but they could and probably will come back after 50 or so miles...Previous code also was P1114 02 sensors and we replaced the front sensor. It may be that the software that is on the car is starting to go..
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I have an automatic (ugh) 2002 Jetta 1.8T that is displaying some fun stuff. My kneejerk reaction is that the ECU is croaking but wanted to run it by some people with more experience/smarts.
Here's the deal. I don't get any codes, ever. Sometimes, when I turn the ignition to on (Before starting) all of my warning lights are dim and will flicker, and the gear indicator at the bottom of the cluster rapidly switches between each gear. If I start the car like this, I can hear the shift lock randomly engaging and disengaging. If I actually try to drive, it'll shift hard into reverse, shift normally into drive, and then drive in limp mode. I only drove this way three times before figuring out the next bit. Each time, either the traction control or air bag warning lights came on and stayed on.
I've noticed that if I turn the ignition to "on" and it's acting up, all I have to do is leave it on for a few seconds, turn the ignition back off, and turn it back on; sometimes it'll take 2-3 tries but it always seems to work. Then the warning lights come on bright and steady, the car starts like normal, and drives great.
So, is it the ECU? Is it demons?
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I have a Mk4 1.8t , I left a light on and near killed the battery one night , was parked on a hill so I let it roll start.( I know this is where I went wrong so lets get past it....) It started in what sounds like some type of limp mode, dim dash lights and about 300-400rpm. cruised at about 10mph for say a 1/4 mile before the engine returned to normal rpm and lights returned to proper brightness.. now the car has a problem I cant seem to put my finger on. When it gets to about 3000rpms it bucks and begins to throw multi misfire codes making it hard to even get to 30mph.
It reminds me of how it felt when all the coils started failing but I know it cant be that because its all new , (plugs ,coils,) I have also replaced a few other easy parts such as the n75 and the diversion valve next to it, as well as the fuel pump and filter. One thing I noticed when I leave my n75 unplugged (wide open) it seems to run better making it easier to drive but if I go anywhere past 1/4 throttle it bucks and struggles. I've used the Autel to scan it for other codes but the only thing I get is random multi mis codes and mis codes for each individual cylinder.
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Preliminary info:
APR 93 tune
Carbonio Intake
Silicone TIP
I picked up my 20th today and drove it 4 hours home. It has 74k on it, original timing belt. The timing belt kit is in the mail on its way here. Its the first thing I'm doing.
As I was driving it home on the autobahn doing about 150k/hr and I gave it half throttle to pass, I felt the turbo spool and I accelerated past the car. However, when I went to make the next pass, it felt like I had no power. I feathered the throttle a bit and it felt like my car was only getting maybe 3 PSI of boost. Very little actually. I do not have a boost gauge so I can't really say it accurately. As I was driving, i shut the ignition off and turned it back on. After that, I was able to get full pressure back.
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I have a 03 GLI 24V VR6 6 speed and im having an issue with the brake light.. ive checked all the fuses and emergency brake sensor and they are all good, the issue is the brake light flashes 3 times then will stay on almost immediately and whenever it does the entire drive of the car changes.. without the light on the car runs fine but when it comes on its like the car goes to a limp mode and is leaning out on fuel.. it wont rev past 4k it falls on its face and basically jerks along until I get where I am going.. I've replaced ABS speed sensors, MAF, and front brakes and axles recently.. before this was an random issue that would come and go but now its almost every time and it makes it undriveable..
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I have a 2002 vw golf and its epc light keeps coming on and every time I reach 4000 rpm it goes into limp mode, what is the problem.
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I have been battling a big boost upon acceleration at stoplights for approximately 6 months. Now twice I have gone into limp mode and the tech reads: PO700 (Transmission) and PO731 (Gear 1). I just turned over 190,000 miles but only purchased it a year ago. What is the problem(s)?
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I have 1 month left on my AAMCO rebuilt transmission. I took it in a few weeks ago when it went into "limp mode" (Stuck in 1st gear). Eventually, they got an error code of P0730, which I believe is electrical-related. All was pretty good but then today, driving @ high speed on the interstate, I could not get into 4th gear...
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Twice now, my 2006 VW Jetta has gone into "limp mode"--RPMs rev like mad but I get very little power, won't go into overdrive. Had to get it home both times by using the Tiptronic. The first time it happened, we were driving through The Poconos on a nice day. Shut the car off & restarted it with no problem. The 2nd time was during an intensely hot day & torrential rainstorm in MD. The car sat for 2 days before going back to normal. Is this normal behavior for a VW? And what makes it go into limp mode? I can understand it happening during the rainstorm but on a nice day of normal driving?
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So I was driving kinda hard yesterday on the highway, and it was about 80 degrees outside. At some point in the drive, I got no boost from the turbo at all (my gauge also was showing no boost). I pulled over, stopped the car, and restarted it, and the car was back to normal. Is this something I should be worried about? I am running 93 program APR Stage 1+ with VWR intake and HPFP.
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So on cold mornings my r has been kicking on the epc light and gone to limp mode. The only codes are for the coolant temp sensor and an intermittent accelerator position sensor. Would the temp sensor really cause this? After awhile I can start it up and it runs fine.
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So the other day as I was trying to accelerate my car had absolutely no power at all. it almost seemed like it went into a limp mode or something of the sort. No matter what gear or how much gas i gave it, it barely chugged along at more than an idle. I pulled over turned it off, then waited a few seconds and turned it back on, same deal. Once more, I turned it off and back on and finally, it seemed to be ok. It flashed a warning light but it cleared after I turned off the car.
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