Car goes limp over 8 psi

M

Maccabee33

Registered User
Joined
Jan 13, 2012
Messages
20
Reaction score
0
Points
1
Location
Basingstoke
Ok so no idea if this is right but my car at the moment only boosts to 5 psi. I'm sure from what I have seen on here thats wrong! I have fitted a MBC and it does as it should and I can get upto 10/15 psi. How ever when I do this as soon as the boost reaches anythink over 8 it goes limp and feels like some giant is pulling the car back.

Anyone got any ideas?? As I said before I have no idea what it is but it's almost like the car is cutting the fuel.

All help will be greatly received.
 
Have you fitted the mbc right? And like said, why have you fitted one?
 
I only put it in to see if it would go over 5 psi as I thought it was odd that it's was only boosting at that.

I have been doing more reading and I'm not sure if it's related to my maf as I have had to disconnect it because its faulty and haven't had a chance to get a new one.

I haven't been able to have it scanned either I should be able to get my mate to do it at some point this week I hope.
 
If you have fitted the MBC without the car being mapped then its hitting limp mode... you cannot just fit an MBC on a std map... it simply doesn't work...

<tuffty/>
 
So prior to fitting the mbc your car was only making 5psi?
 
Maccabee33 said:
I only put it in to see if it would go over 5 psi as I thought it was odd that it's was only boosting at that.

I have been doing more reading and I'm not sure if it's related to my maf as I have had to disconnect it because its faulty and haven't had a chance to get a new one.

I haven't been able to have it scanned either I should be able to get my mate to do it at some point this week I hope.
Click to expand...

Has this car been remapped yet?
 
No no remap it is planned. I wasn't using the MBC to gain more boost in that way just to see if it would go over 5psi and yes dani it was only hitting 5 iv not noticed any loss of power since iv had the car and it's always been the same ever since I put the boost gauge in
 
Well that sounds like the cars running on actuator pressure, so either the n75 valve isnt plugged in or its knackered and you need a new one.
 
audi upgrades
I did think it may be that but then loads of post say they don't fail that often. Iv tried running it unplugged and the same. I have also diverted it and it still only hits 5 I'll get a new one and try that. Is there anypoint getting a aftermarket one ? Iv seen people say not to.
 
First off... what engine code? what car? what year? difficult to begin to suggest anything without knowing...

Reading back through some of your previous posts it seems you have bee hacking into various pipes to fit a boost gauge... did this problem happen before or after fitting the boost gauge?

Have you put the N74 pipework back to how it was? from what I read you didn't connect it right... incorrect pipework on the N75 may well be the problem here if not..

<tuffty/>
 
No car felt the same before adding the boost gauge. All pipe work is completely back as before except for joining piece. With clamps. And boost gauge in. Correct place. Its a V reg I think 99. 1.8 t front wd 150bhp.

Sorry I know you guys must be going bad about how car retarded I am. I work on tech support so I know the feeling and I apologise.
 
seriously dude, you're asking about boost issues, and playing with an MBC, whilst all the time your MAF is unplugged?

Why even bother asking for advice.....

''Guys, I have severe trouble walking, please help''

''hmmmmmmmmmmmmm, I can't think what your problem would be Sir, can you give us more information''

2 hours later......


''oh, by the way, I've got no legs, don't know if this matters''

Fix the known faults before trying to solve the unknown.....
 
Sorry if that sounded arsey. it wasn't intended that way, but you'll never have any joy chasing problems if you have existing known issues in the first place.
 
All good bud... we all started somewhere :D

If its an AGU then chances are the MAF is a little tired... the MAF's on AGU's control just about everything... I would grab a copy of VCDS or find someone that has it and get the car scanned for fault codes...

<tuffty/>
 
Maccabee33 said:
No car felt the same before adding the boost gauge. All pipe work is completely back as before except for joining piece. With clamps. And boost gauge in. Correct place. Its a V reg I think 99. 1.8 t front wd 150bhp.

Sorry I know you guys must be going bad about how car retarded I am. I work on tech support so I know the feeling and I apologise.
Click to expand...

I wouldn't worry too much dude, just stop doing things the **** bodging way and get it mapped properly from here on in. There are people who think they can do all this themselves, and it always ends in disappointment and tears.

Take the MBC back off, get a new MAF and see if it still runs into limp mode. Then go and get it scanned properly, and assuming it runs normal with the MBC off and the fault codes removed go and get it remapped.
 
It was doing it before the maf was unplugged or had a problem. I totally understand I'm annoying myself on how little I know or I can assist
 
Maccabee33 said:
It was doing it before the maf was unplugged or had a problem. I totally understand I'm annoying myself on how little I know or I can assist
Click to expand...

Get a new MAF, if it was doing it before the MAF was unplugged...and the MAF was unplugged because it was faulty...and it's still doing it now without the MAF...you do the math. :icon_thumright:
 
Thanks <tuffty/> I saw a post today about cleaning the maf so was going to do that to see if it sorted it.

It's odd that defore I had a problem with the maf it was still running at 5 psi. I'll have a look tomorrow and see what engine it is.

Thanks for your help


16klappe I'm going to don't worry! Just got the clear the bar tab first so I can pay for it ;)
 
Out of interest, if you haven't got VCDS how do you know the MAF is faulty? Why did you unplug the MAF?
 
Car was cutting out randomly then got really bad and was stopping staring. Had my friend an actual mechanic have a quick look. Unplugged maf problem goes away. It was shutting its self off foursome reason. He said to get a new one just not had the chance and not going to lie wile it was running ok I have left it will get it sorted now I know how much it's controlling.
 
Maccabee33 said:
Car was cutting out randomly then got really bad and was stopping staring. Had my friend an actual mechanic have a quick look. Unplugged maf problem goes away. It was shutting its self off foursome reason. He said to get a new one just not had the chance and not going to lie wile it was running ok I have left it will get it sorted now I know how much it's controlling.
Click to expand...

And have you tried plugging the MAF back in? How do you mean "it was shutting itself off"?
 
Yeah as soon as I do the car won't start or if you have the car running it stalls when plugged back in. Not 100%as I'm sure is obvious haha. It closes the part inside ??? I assumed it was lack of oxygen. Wouldn't be suppressed if I was completely wrong
 
A duff maf can make the car chop out. My last one did it. With the maf disconected you'll be lucky to see 5 psi. Stick a new bosch replacement and your massive 8psi will be restored assuming nothing else is broken
 
Awesome thanks dude! I'll get that ordered up. Then I can start looking for some ware close to get a remap done.

Any one know any in Hampshire/ Berkshire Basingstoke area ideally
 
dude, did you want to try a different maf first and see if it helps things?

I'm in Basingstoke, and have a MAF that's not being used until next weekend if you want to try it..... Could also plug it into Vagcom and see what's coming up.....

Remap places close to you are Storm developments in Aldermaston, or JKM in Pompey
 
Awesome yeah that would be good! We're abouts in Basingstoke are you? Storm the guys that do the superchargers? They are just down the road from work. Perfect :)
 
Maccabee33 said:
Awesome yeah that would be good! We're abouts in Basingstoke are you? Storm the guys that do the superchargers? They are just down the road from work. Perfect :)
Click to expand...

You can usually find him parked up just over the motorway bridge going up to Farley Mount, about 9PM on Tuesday nights. You'll know it's him because he'll have his interior light on whilst he reads the paper.
 
Yeah hooked the maf back up and no engine start. Took it off and had a look.... The sensor had half broken off god knows how but I'm defiantly off to get a new one now!
 
ftr, when i changed my MAF sensor, i stopped going into limp mode.
 
haha, thanks Jardo. charming.

I'm in Hatch Warren mate, a few hundred yards from Sainsburys. What about you?
 
Oh right I think I know. Don't no Basingstoke to well only just moved here. Even though I did used to live in kingsclere I never really explored much. I'm up behind the station A couple of roads down from the vine ?
 
Maccabee33 said:
No car felt the same before adding the boost gauge. All pipe work is completely back as before except for joining piece. With clamps. And boost gauge in. Correct place. Its a V reg I think 99. 1.8 t front wd 150bhp.

Sorry I know you guys must be going bad about how car retarded I am. I work on tech support so I know the feeling and I apologise.
Click to expand...

AGU

dont just up the boost
not advised..
get it remapped properly
it will end in tears else
 
Thanks badger 5. That's what I'm planning on doing. Storm devopments are meters away from my work and have a deal on a stage 1 for £148.
 
Maf swapped much nicer but same problem. Put MBC in place of n75 as test and runs fine at normal boost. So of to get a new n75 now will post progress
 
You must log in or register to reply here.

Similar threads

S
Can’t boost over 10 psi
Replies
1
Views
489
NHN
NHN
A
TURBO CUT OFF - GOES INTO LIMP MODE
Replies
3
Views
2K
Ess_Three
Ess_Three
OPENM2KE
Car over heating
Replies
8
Views
706
superkarl
superkarl
ruffrida
2000 Sport TDI - Limp Mode / Over Boost
Replies
44
Views
8K
pjgorton
P
Steveo_A3_1.8t
car keeps going into limp mode please help.
Replies
13
Views
7K
Steveo_A3_1.8t
Steveo_A3_1.8t
Top
Back