Volkswagen Mark IV Forum banner
1 - 20 of 38 Posts

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #1 ·
Just had the car towed back. Driving to Blackpool on the motorway and
the car totally cuts out! no brakes, no power steering, managed to pull
it in to the hard shoulder and call the AA out.

The car will turn over and fire up but will not idle at all, just dies
immediately.

When the MAF is disconnect, the car will start and idle, but
cuts out as soon as it is re-connected.

Is this a knackered MAF or could it be something else?
 

·
Registered
Joined
·
6,881 Posts
Sounds very much like it if when you take the MAF off it idles, but when you put it back on it doesn.t Have you had any problems leading up to this? Have you tried the obvious and given the MAF a damn good clean?
 

·
Premium Member
Joined
·
25,430 Posts
Never known of MAF to cause a problem like that. Best see what codes are being thrown before going any further.

Usually with the MAF disconnected on an AGU it runs in Limp mode - so this could be indicating a problem elsewhere in the system if normal running doesn't resume when reconecting the MAF.
 

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #4 ·
Nah, no problems leading up to it.

Just taken the MAF off, is/are the prongs in the centred meant to be one piece?

It does run in limp mode kind of, there's alot of whistling while
driving and the car won't go over 30mph, accelerator flat to the floor
 

·
Premium Member
Joined
·
25,430 Posts
Won't go over 30mph? Limp mode should just kill the turbo and limit your power, you should still be able to see well over 30mph.

MAF looks ok but you will need to check for codes to see whats going. Anyone local you know with VAG COM?

Any recent work you've had done on the car?
 

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #7 ·
Yeah, around 30mph, then when you floor it there's just a sound of air
hissing and no acceleration. Nobody local has VAG-COM as far as I know.

Only recent work was the new turbo [:S] Not got a CAI
 

·
Premium Member
Joined
·
25,430 Posts
I smell a boost pipe!

You're gonna have to get your hands dirty here mate [:D] I'm guessing one of your boost pipes has come loose. I'd say check your turbo inlet pipe (the one from the your airbox to turbo) then pop off your drivers side wheel and arch liner and check the rubber hose connecting your pancake pipe to IC.

Also check the pipe connecting the top of the IC to the throttle body.

Same thing happened to me. IC pipe blew off and the car was undriveable. Would cut out the moment you engaged the clutch and made all kinds of hissing noises.

I'll give you a call in a mo as there are other things to check.....
 

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #11 ·
I smell a boost pipe!

You're gonna have to get your hands dirty here mate [:D] I'm
guessing one of your boost pipes has come loose. I'd say
check your turbo inlet pipe (the one from the your airbox to
turbo) then pop off your drivers side wheel and arch liner and
check the rubber hose connecting your pancake pipe to IC.

Also check the pipe connecting the top of the IC to the throttle body.
Both pipes are connected ok.

Sensor thingy in the MAF has snapped so definitely need a new one anyway, car now starts and drives with MAF connected.

Just been round the block, when throttle is down there is a loud
whoosh, like a CAI. Once it hits 25mph, it doesn't go anywhere, it
almost stalls when the accelerator is floored.

Could the turbo have blown?
 

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #12 ·
There's also a sound of loose metal "clanging" whilst driving?!

Is there any way to force the car into limp mode, would this help see if the turbo is at fault?
 

·
Registered
Joined
·
6,881 Posts
David, in all honesty, I wouldnt drive it and get an expert to (or maybe even VW!) to check it out, you could be doing more damage driving it around. Certainly doesnt sound like a maf or air mass meter now!
 

·
Premium Member
Joined
·
6,442 Posts
Discussion Starter · #17 ·
JBS said the same, boost pipe, need to check another pipe on top of the turbo under a heat shield, anyone got any pics of this by chance?
 

·
Premium Member
Joined
·
25,430 Posts
Just to confirm, its the large silver pipe with a metal jacket type heat shield wrapped around it.

The inlet for the DV comes from it (you can just make it out in the pic above, far left, hose that comes from the pipe to the DV). I'd check that connection, and the hose, too.
 
1 - 20 of 38 Posts
Top