welp...i don't think it's bad gas. Can anyone help me figger this out?
04-23-2002, 03:42 PM
#1
AudiWorld Super User
Thread Starter
welp...i don't think it's bad gas. Can anyone help me figger this out?
Just took the car out to get some lunch (I hate working late).
car was losing power big time. No CEL's...probably no DTC's like last time (although I'll check).
It was more a power loss than anything else now. It was losing and gaining bpower back and forth a whole bunch for the first minute of my travels. Then when I would go near WOT, the boost would cap around 10-12psi (bouncing like a rev-limiter) and the car would feel like it's in a gear lower than it should be.
Crap.
I'm thinking a possible boost leak. I need to datalog the O2 sensor to see ifi'm runnign lean/rich or not.
Anyone have ANY ideas what could cause this?
car was losing power big time. No CEL's...probably no DTC's like last time (although I'll check).
It was more a power loss than anything else now. It was losing and gaining bpower back and forth a whole bunch for the first minute of my travels. Then when I would go near WOT, the boost would cap around 10-12psi (bouncing like a rev-limiter) and the car would feel like it's in a gear lower than it should be.
Crap.
I'm thinking a possible boost leak. I need to datalog the O2 sensor to see ifi'm runnign lean/rich or not.
Anyone have ANY ideas what could cause this?
04-23-2002, 03:56 PM
#7
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Hmm...
I've had this happen before, and it turned out to be a boost leak in one of the vacuum lines. No DTC's, etc., but very low boost.
My money's on that.
There are a lot of ways to check for a leak. I was lucky enough to spot mine with a visual inspection. One idea I have heard is to cap one end each of 2 pieces of PVC pipe, tap an air fitting or two in them, and fit them to the intake hose at each end of the system (turbo compressor outlet, and intake manifold). Use that to pressurize the system. If you tap the second air fitting, you can add a pressure gauge. It is important not to exeed 30 PSI (no sense creating any new leaks where none existed before).
Another method was to get some carb cleaner or something that won't harm the rubber but is still somewhat volatile (conflict in terms, I know), let the engine idle, and start spraying all along the hoses until the RPM jumps.
Paul
My money's on that.
There are a lot of ways to check for a leak. I was lucky enough to spot mine with a visual inspection. One idea I have heard is to cap one end each of 2 pieces of PVC pipe, tap an air fitting or two in them, and fit them to the intake hose at each end of the system (turbo compressor outlet, and intake manifold). Use that to pressurize the system. If you tap the second air fitting, you can add a pressure gauge. It is important not to exeed 30 PSI (no sense creating any new leaks where none existed before).
Another method was to get some carb cleaner or something that won't harm the rubber but is still somewhat volatile (conflict in terms, I know), let the engine idle, and start spraying all along the hoses until the RPM jumps.
Paul
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04-23-2002, 04:00 PM
#9
AudiWorld Super User
Thread Starter
I'm thinking it may be that...so here is what I'm going to do.
I'm going to map the A/F on a friend's VAG. If i'm running lean, then i'll know that it could be the FPR line (where I tapped my boost gauge....yeah yeah....I know).
but here's the other thing...when I had my timing belt done, they replaced all my Vac hoses. And they even replaced the hose that my Boost gauge was in, and re-tapped it.
but here's the other thing...when I had my timing belt done, they replaced all my Vac hoses. And they even replaced the hose that my Boost gauge was in, and re-tapped it.