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Old 02-21-2005, 10:02 AM   #1
mpaone
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and 71' VW Gulf Beetle

Question Does the charcoal canister need replacement?

Recently I installed a rear lightweight bumper beam. After installation, the car was a little hesitant to boost fully and it seemed like even though I was seeing about 17psi (Cobb stg 2), the car was not going anywhere after about 5500 rpm.

The only thing I touched was the carbon/ charcoal canister under the pass rear of the car. I did not disconnect anything but I did need to twist it around a lot to get to the beam bolts.

My question is: does this part need to be replaced at all and could it cause drivability issues if there is something wrong with it? FYI, the WRX engine has only about 12k miles but the RS chassis has over 120k.

BTW, since then I've restet the ECU and it's much better but still lacking from it's original power levels.

TIA,
-Mike.
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Old 02-21-2005, 03:50 PM   #2
armand1
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Quote:
Originally Posted by mpaone
... does this part need to be replaced at all and could it cause drivability issues if there is something wrong with it?...
I'm not an expert on this, but it's certainly plausible that after 120k miles of wear & tear, plus your manhandling, the charcoal canister and/or the hoses attached to it might need replacing. The canister is used to "soak up" gasoline vapor rather than releasing those vapors to the outside air (this happens when refueling, and also when the temp goes up, letting the fuel tank internal pressure stay constant).
The ECU is programmed to "empty out" the canister by sucking outside air through the canister, carrying out the stored vapor and transferring it to the intake manifold. If the canister/tubing is disconnected/leaking, you could be getting too much air in through this route; if the canister/tubing is blocked, you could be getting less air than the ECU thinks.
I would think that you could test this by disconnecting the hose going to the canister at the purge control solenoid valve (this is up front) and trying to drive the car with the input to the valve blocked, then trying to drive the car with the input to the valve open to air. If one of those conditions keeps your problem the same, then that should be the type of problem you have.

Last edited by armand1; 02-21-2005 at 03:56 PM.
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Old 02-21-2005, 04:32 PM   #3
mpaone
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Question

Quote:
Originally Posted by armand1
I would think that you could test this by disconnecting the hose going to the canister at the purge control solenoid valve (this is up front) and trying to drive the car with the input to the valve blocked, then trying to drive the car with the input to the valve open to air. If one of those conditions keeps your problem the same, then that should be the type of problem you have.
thanks. Where is the purge control solenoid? Is it attached to the intake tube that runs under the pass side intake manifold runners?

-Mike.
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Old 02-21-2005, 10:52 PM   #4
benjis jun
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pcv? 02 wrx here-its under the throttle bodie.
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Old 02-22-2005, 07:55 AM   #5
mpaone
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Originally Posted by benjis jun
pcv? 02 wrx here-its under the throttle bodie.
DUH! I'm an idiot... seeing it spelled out like that confused my old brain.

-Mike.
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Old 02-23-2005, 05:29 AM   #6
armand1
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Quote:
Originally Posted by benjis jun
pcv? 02 wrx here-its under the throttle bodie.
No, the PCV valve is the Positive Crankcase Ventilation valve, a small plastic inline part; the Purge Control Solenoid Valve is a larger electrical-solenoid-driven valve.
Unfortunately, I've got a 2.5NA, but I'll see if I can find a diagram that shows where the "PCSV" is on the 2l turbo; IIRC, it's somewhere near the middle of the intake manifold, with a short tube going to the manifold, and a long one running back to the canister.
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Old 02-23-2005, 12:51 PM   #7
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Quote:
Originally Posted by armand1
... I'll see if I can find a diagram that shows where the "PCSV" is on the 2l turbo; ...
FWIW, the purge control solenoid valve is "installed at the underside of intake manifold" according to the Mechanism & Function service manual (don't have a 2.0l turbo engine volume). From a diagram (schematic, so it may not be quite right), it looks like its shorter hose connects to the intake manifold just downstream of the TPS and idle air control solenoid valve.

Also, just thinking back to your original post, I wonder if it could have been a problem with the gas tank somehow. For example, your work on the rear end dislodging sediment in the tank and partially blocking fuel flow. Just a WAG.

Last edited by armand1; 02-23-2005 at 12:56 PM.
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Old 02-23-2005, 02:04 PM   #8
mpaone
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Quote:
Originally Posted by armand1
FWIW, the purge control solenoid valve is "installed at the underside of intake manifold" according to the Mechanism & Function service manual (don't have a 2.0l turbo engine volume). From a diagram (schematic, so it may not be quite right), it looks like its shorter hose connects to the intake manifold just downstream of the TPS and idle air control solenoid valve.

Also, just thinking back to your original post, I wonder if it could have been a problem with the gas tank somehow. For example, your work on the rear end dislodging sediment in the tank and partially blocking fuel flow. Just a WAG.
I'm pretty sure I know where this hose is now.

And you may be right about the tank as well... I had the rear of the car up on ramps for a while and all of that moving around may have cause some issues. The tank does have lots of fill ups under it's belt.

-Mike.
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Old 03-02-2005, 08:37 PM   #9
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is there not also a mechanical purge valve that actuates under boost
thats the round plastic jobby infront of the intake manifold... that mechanism may vary between years and i'm confused however...
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Old 02-22-2005, 08:18 AM   #10
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...you may have pulled a hose loose.....poke around a bit and see if something isn't secured properly.....also....did you do ANYTHING else just prior to having the boost issue.
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Old 02-23-2005, 09:47 AM   #11
mpaone
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Quote:
Originally Posted by Uncle Scotty
...you may have pulled a hose loose.....poke around a bit and see if something isn't secured properly.....also....did you do ANYTHING else just prior to having the boost issue.
Nothing at all. It's odd that it is almost gone now though. Maybe all of that moving of the canister caused the ECU to see something different after I started the car back up.

I might look into having the canister replaced if it's not too expensive. I'll also plug in my OBD2 scanner and see if there are any codes.

-Mike.
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Old 02-23-2005, 11:32 AM   #12
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...I guess it is possible that some liquid that may hve been in it may have moved around inside causing some problems that have cured themselves since.....
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