Car hesitating when on Boost...

[steve0]

As title says really!!

It did it the first time the other day and I shat myself. Hasnt done it since, but then this afternoon started doing it pretty often. Kinda begins to boost and then just holds back. Its not all the time tho, just every now and again.

What could be causing this?? Need it sorting asap, cos I gotta drive like 200 miles next week.

Any info or advice greatly appreciated.

Cheers

 

[GaryM]

Have you changed the service station where you refuel or started to use a different grade?

 

[davidol]

maf? vagcom the car to check for faults, if none then do some datalogging to be sure

 

[t111bul]

Hi, sounds like you're coil packs maybe shagged fella . If you're car is under 5 years old and has done less than 100k miles SEAT will replace them under warranty .

 

[kieran_cupra]

is it loosing boost???

My car has started doing this today but on the boost gauge i nticed that at one point it wouldnt boost over 5 psi!!, On amother run it was back up to 17psi but dropped to 14 then boosted back up before i changed gear???

Any sugestions ?? N75???

Kieran

 

[steve0]

Not really changed petrol that I can think of.

davidol - Maf was replaced about 6k miles ago.

t111bul - Bastid, the car's done lass than 100k but its 5 years and 3 months old!! How much are they to buy?? Anyone got any idea?

Whats the best way to check if it is these thats gone??

 

[rogers]

my maf was replaced about 3k ago and its been reked for about 1k already so it doesnt matter they are rubbish!

 

[cu51pra]

Not really changed petrol that I can think of.

davidol - Maf was replaced about 6k miles ago.

t111bul - Bastid, the car's done lass than 100k but its 5 years and 3 months old!! How much are they to buy?? Anyone got any idea?

Whats the best way to check if it is these thats gone??

it wont be coilpacks your car isnt miss firing just holding back mine does it somtimes

 

[steve0]

is it loosing boost???

My car has started doing this today but on the boost gauge i nticed that at one point it wouldnt boost over 5 psi!!, On amother run it was back up to 17psi but dropped to 14 then boosted back up before i changed gear???

Any sugestions ?? N75???

Kieran

Sounding totally naive here, but what exactly is the N75 please????

 

[JKing]

sounds like it's dropping into limp mode. Best thing is to get it on VAGCOM as there's a few things it could be. Mine was doing similar things and turned out to be the MAF. I also bypassed the N249 and replaced the temp sensor at the same time though so they could also have been affecting it.

 

[steve0]

sounds like it's dropping into limp mode. Best thing is to get it on VAGCOM as there's a few things it could be. Mine was doing similar things and turned out to be the MAF. I also bypassed the N249 and replaced the temp sensor at the same time though so they could also have been affecting it.

Whats the best way to get it on VAGCOM, as im about 70 miles from the nearest Seat garage, and dont know anyone in my area with it. Wud just an ordinary Diagnostics machine from most garage's not bring up the fault??

Also, the ECU light had alreay been on for about a week or so before this happened. It's been on the scanner and it brought up the fault codes for Lambda Sensor before the Cat and the Oil Temperature Sensor. Could it be any of these casing the hesitations??

 

[JKing]

lambda sensor controls the air/fuel ratio so yes if that was flagged as a fault it could cause the hesitation.

You sure it was oil temp sensor and not water temp.

I'm sure someone on here would be pretty close to you and would be able to get it on VAGCOM. Seat charge a fortune for it

 

[steve0]

lambda sensor controls the air/fuel ratio so yes if that was flagged as a fault it could cause the hesitation.

You sure it was oil temp sensor and not water temp.

I'm sure someone on here would be pretty close to you and would be able to get it on VAGCOM. Seat charge a fortune for it

That would be good if it was the lambda sensor, as I have a new one arriving from Seat today!

Pretty sure, although not 100%. What would it mean if it was the Water Temp Sensor??

Yeah, i no. Im based in Barrow-in-Furness in Cumbria which is pretty much out on a limb. There anyone on here with VAGCOM in my area???

 

[steve0]

That would be good if it was the lambda sensor, as I have a new one arriving from Seat today!

Pretty sure, although not 100%. What would it mean if it was the Water Temp Sensor??

Yeah, i no. Im based in Barrow-in-Furness in Cumbria which is pretty much out on a limb. There anyone on here with VAGCOM in my area???

Anyone atall?? VAGCOM?

 

[jetsetjimbo]

Steve - are still experiencing this slight hesitation? Found a resolution?

 

[PhilW]

Lol @ all these possible reasons to what causes the holding back yet you havent said what mods (if any) you have or any info about the car.

Have you got vag com?

It aint coil packs, and its not limp mode otherwise you would still be in it. My guess its a ****ed DV or N75 tho. But get it checked on vag com otherwise we;re just pissin in the wind.

 

[flooky]

yeah ive got the same problem, holds back on boost and few miles later it will boost fine... think my nextdoor neighbours has VAGCOM but not sure if he still has it.. if not is there anyone near gloucester that could have a look at mine please?

 

[Quikie]

where can u purchase one of these VAGCOM Diag machines or devices at? are they easy to operate?
mine car now has the same problem, it starts stuttering and boostin then stutter again but if i lift my foot off and give it gradually it will go better but still slight hesitations, really fecking me off!

I dont know what an n75 does looks like or where it is, along with the MAF thingy

 

[steve0]

It turned out in the end to be my spark plugs causing this. It was missing on 3 and 4, due to old plugs!!