Sluggish A4, Turbo Making Weird Noise

painterman · 04-10-2006, 12:32 PM

02' A4 (B6) (bone stock)

Very sluggish, can't get out of it's own way until 3500-4000 rpm. Boost is absent until the higher rpm's are reached.
I can hear a rattling sound in the turbo at idle it seems to go away when rpm's go up.
Took it to repair shop, they said turbo is bad, needs to be replaced. I started an online search/diagnosis of my own and think they may be wrong.

Here's what I think it could be:
1. boost leak - a leaking hose somewhere (tennis ball test?)
2. a bad wastegate actuator - I think this can be replaced, don't know where to buy.
3. a bad DV - how to check?
4. a bad N75 - how to check?

I'm trying to avoid buying a new turbo as money is tight right now, any ideas would be greatly appreciated!

**AllWheelGrip** · 04-10-2006, 10:15 PM

did the shop check all those for u

painterman · 04-10-2006, 11:27 PM

No, they just told me the turbo was shot. I'm having a hard time believing them because the turbo does kick on at higher rpm's. I asked them today about the DV and the wastegate actuator, they said it was OK.
At this point I'm thinking I should get the car back, pull the turbo and check it out myself.

The Air Control Sensor is missing. Could that be causing my probs?

**kazyee** · 04-11-2006, 10:06 AM

thats a possibility, check ur hoses and make sure its getting the proper air it needs, a kink in the hose could cause this too.

fisheggs · 05-09-2006, 09:45 AM

have you had your cat checked?
If this is blocked and detached from its housing, you get power loss , hissing and a rattling noise.

fish

JoKeR23z · 05-11-2006, 11:22 PM

o my god , i have the same problem. My mechanic said it could just be from the car sitting for a few months. I have the same exact problem. Anyone know what I could do?
I am desperate for help cause i just ordered a borla exhaust and evoms Diverter valvle. So hopefully if i put a new DV in it fixes =)

any1 else have any other suggestions or help please respond

fisheggs · 05-15-2006, 07:21 AM

Guys ,
The simplest check with the exhast cold is to tap the catalytic converter with your hand and if it rattles,,, theres your problem!
If not look elsewhere. IMHO turbos don,t rattle when they expire. It is usually quite dramatic!

Fisheggs

JoKeR23z · 05-24-2006, 09:30 PM

Would the catylit converter be causeing all this power loss? If thats wuts wrong?

04-10-2006, 10:15 PM	#2 (permalink)
AllWheelGrip Super Moderator Join Date: Jun 2005 Posts: 1,725 Gallery: (0)	did the shop check all those for u __________________ There are many paths to the top of the mountain but the view will always be the same

04-11-2006, 10:06 AM	#4 (permalink)
kazyee Moderator Join Date: Jan 2006 Posts: 532 Gallery: (0)	thats a possibility, check ur hoses and make sure its getting the proper air it needs, a kink in the hose could cause this too. __________________ when you wake up in the morning, ask yaself, who are you? if you dont know.... how could ya dreams come true?

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04-10-2006, 12:32 PM	#1 (permalink)
painterman Newbie Join Date: Jan 2006 Posts: 5 Gallery: (0)	02' A4 (B6) (bone stock) Very sluggish, can't get out of it's own way until 3500-4000 rpm. Boost is absent until the higher rpm's are reached. I can hear a rattling sound in the turbo at idle it seems to go away when rpm's go up. Took it to repair shop, they said turbo is bad, needs to be replaced. I started an online search/diagnosis of my own and think they may be wrong. Here's what I think it could be: 1. boost leak - a leaking hose somewhere (tennis ball test?) 2. a bad wastegate actuator - I think this can be replaced, don't know where to buy. 3. a bad DV - how to check? 4. a bad N75 - how to check? I'm trying to avoid buying a new turbo as money is tight right now, any ideas would be greatly appreciated!

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04-10-2006, 11:27 PM	#3 (permalink)
painterman Newbie Join Date: Jan 2006 Posts: 5 Gallery: (0)	No, they just told me the turbo was shot. I'm having a hard time believing them because the turbo does kick on at higher rpm's. I asked them today about the DV and the wastegate actuator, they said it was OK. At this point I'm thinking I should get the car back, pull the turbo and check it out myself. The Air Control Sensor is missing. Could that be causing my probs?

05-09-2006, 09:45 AM	#5 (permalink)
fisheggs Newbie Join Date: May 2006 Posts: 7 Gallery: (0)	have you had your cat checked? If this is blocked and detached from its housing, you get power loss , hissing and a rattling noise. fish

05-11-2006, 11:22 PM	#6 (permalink)
JoKeR23z Member Join Date: Jun 2005 Posts: 33 Gallery: (0)	o my god , i have the same problem. My mechanic said it could just be from the car sitting for a few months. I have the same exact problem. Anyone know what I could do? I am desperate for help cause i just ordered a borla exhaust and evoms Diverter valvle. So hopefully if i put a new DV in it fixes =) any1 else have any other suggestions or help please respond

05-15-2006, 07:21 AM	#7 (permalink)
fisheggs Newbie Join Date: May 2006 Posts: 7 Gallery: (0)	Guys , The simplest check with the exhast cold is to tap the catalytic converter with your hand and if it rattles,,, theres your problem! If not look elsewhere. IMHO turbos don,t rattle when they expire. It is usually quite dramatic! Fisheggs

05-24-2006, 09:30 PM	#8 (permalink)
JoKeR23z Member Join Date: Jun 2005 Posts: 33 Gallery: (0)	Would the catylit converter be causeing all this power loss? If thats wuts wrong?

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