Fixxxer

Happy to hear but it appears to me that your regulator might be getting a bit tired, lacking lubrication and stretched so I would suggest to keep that window clean to make it easy on the regulator to keep working with the least resistance possible. Keep us updated!

Agreed. I'm thinking that the problem has only recently arisen due to the cooler weather; causing things to not want to slip and slide as they should. I'll keep checking it over the next few days. If it comes back, I may open the door up and perform the bicycle brake cable adjuster mod to tighten things up a bit (I already had to do that on the driver's side for the "window-not-dropping-when-the-door-is-opened" issue.) I'll keep you posted!

I've made an interesting finding:  After following the steps you outlined above, Loren, the problem persisted.  The window would go down fine, but pause about half way up and go back down.  So I decided to try opening the passenger door before attempting to use the one-touch operation again, and it worked!  The window went up and down with no issues.  I closed the door and tried to operate the window again...  Still working!

It seems that cycling the window through it's up/down positions with the door open has made it start working - at least temporarily.  I'll keep an eye on it and post here with anything new I that find.

Thanks, Loren.  I'll be running some errands in the next hour, so I'll give it a shot then and report back.

I've searched the forums, and I haven't found a similar issue...

I have a 2004 Targa and the windows have been working great up until the last couple of weeks.  Now when I have the passenger window down and I press the switch for it to go back up, it'll get about half way up, pause, and then put itself back down.  After a couple of tries I can manage to get it to go all the way back up by holding the switch down.  I've tried resetting the limits, but that didn't help.  The driver's side window works great.

Any ideas?

I have a 2004 Targa with the Bose upgrade. When I bought the car, one of the previous owners had replaced the headunit, removed the Bose amp, and had not reconnected the passenger footwell sub.

I'm not a huge music listener in the car, so I'd like to remove the Bose subwoofer to get some more legroom back on the passenger side. However, I can't seem to find a carpeted trim piece to cover the hole that's left by the subwoofer. Does anyone know where I can find that, or have a part number?

Thanks!

HI All- i utilized the krytox on the rails, eliminated all squeeks and rattles. I went deeper thought and removed the back panel (inside) and the 2 panels that contain the gearing for the roof. lubricating them with white lithium grease also sped the roof closure. it seems though that the motors are still working pretty hard against the mechanisms that are pushing forward and pulling rearward the sliding roof. i ran out of time and closed it up, but my gut feel is that the next step will be to remove the cover holding the gears, and i should have visibility to what the gearing is pulling/pushing, and be able to hit that with the krytox or the grease. i am going to take pics and document for all 996 and 997 targa owners to have (not too many of us). should accomplish in the next month or so....stand by! Thanks for the responses

Also- due to all the direction on this site, and Streathers essential companion, i changed the oil and filter, air filter and cabin filter- all without drama or problems...a great weekend.

Did you ever get a chance to document this? I'm having a similar issue, but having some pics of what needs to be greased would help me a lot! :)

Thanks for the replies so far, guys. I was able to pull some data from Torque that shows this happening. I only made it up to 111 mph on this quick run, so the temp only dropped from 179 F to 150 F, but it's still noticeable in the data. Attached you'll find a screenshot of the raw data, a graph, and a ZIP file containing the whole spreadsheet of data. In the graph, the green line is coolant temp; the blue line is GPS speed; and the tall, flat purple line in the center is throttle position.

There are no unusual spikes (+/-) in the coolant temp's data (as seen in the overall zoomed-out view at the bottom of the graph), other than the one discussed here at high speed, so I find it hard to believe that it's a temperature sensor issue. Could it be the water pump, or maybe air in the coolant system?

Thanks again!

-Lee

2013-05-14 2004 911 Targa Torque Log.zip

The other day I got my 2004 996 Targa up to ~120 mph at a track day event. After my first run, I glanced down at the coolant temp gauge, and I noticed that it had dropped to ~140 (it's normally around 185 when warmed up) and was slowly coming back up to normal. On my next run it happened again, but only after I was over ~100 mph. When it happens the needle quickly drops to 140 - within 5 to 10 seconds. On one hand, I'm thinking that the volume of air at that speed is cooling the coolant down very quickly. But that's an awful big drop in temp... I'm also wondering if I have a thermostat that's stuck open. However, the motor doesn't take a long time to warm up in the mornings - maybe 5 minutes at normal city speeds (40 - 60 mph), and it stays constant at 185 in everyday driving conditions. Has anyone else experienced this? Is it normal?

Thanks!

-Lee

Interesting. Thanks for the info!

Still no CELs! I think cleaning the MAF is what did it. The car is still running much better than before, especially when starting from a stop (I have a manual trans., not Tip). I still wonder though, how could a dirty MAF cause a CEL to only occasionally show up? Shouldn't it appear the next time I drive after it was reset? Weird...

Just for giggles, I replaced the stock airbox this week (it had a K&N FIPK installed from the previous owner) and cleaned the MAF. My first impressions are that it's running better/stronger, but it could be my imagination. I'll pulled some OBD2 data on a couple of short trips, and the LTFTs look okay - still no CELs. I'll keep an eye on it and report back if anything strange happens.

Okay, this is still really troubling me. Last week, I disconnected the battery for about 30 minutes, thinking that a reset of the ECU might help it re-learn everything properly. Unfortunately, the very next day it popped another CEL (same as above) on my way home from work as I was pulling up to a stop sign. Something is really screwy here... It shouldn't be an O2 sensor, a vacuum leak, a leaking fuel injector, or a stuck Evap purge valve, because any of those would either be throwing different fault codes and/or only affecting one bank.

That only leaves the MAF or an air leak. I've checked and can't find any air leaks. Plus, if it was an air leak, it wouldn't be happening so randomly and only at idle, would it? When I tested the MAF voltage at KOEO (Key On Engine Off) and at idle, the readings were right where they should be: 0.9V - 1.0V at KOEO, and 1.45V at idle. However, when I revved the engine a bit (around 3,000 RPM), that figure came up to around 1.8V. Is that normal, or should it remain at 1.4V through the RPM band?

If it's not the MAF, what else does that leave? Any help would be greatly appreciated. This is driving me nuts!

Thanks, Karl. That is very interesting. I tested my MAF last night using this method, and it checked out just fine. There's something else going on here... I'll check again for air leaks.

Thanks for the reply! I actually saw that thread in my search - I just wasn't sure if the fuel trim data I captured would help pinpoint the problem.

BTW, I've also looked for air leaks and found none.

EDIT:

The plugs that I installed were OEM and were gapped properly. I was receiving the same CEL before the plug change, so I don't think it's related.

That's interesting that Porsche doesn't use STFTs. I didn't know that!

Hello everyone. I've had these two faults appear three separate times now, all within about 100 miles of each other, and all when the car has been idling for a short period.

P0172: System too Rich (Bank 1)

P0175: System too Rich (Bank 2)

I've searched the forums, and it seems the likely cause is the MAF, but I wanted to post my Torque Pro logs of when the CEL occurred to see if any of you could help me pinpoint the problem. For what it's worth, I just changed my spark plugs last weekend (after having seen the CEL twice) and inspected the ignition coils, but no problems were found and the CEL appeared again this morning. My MAF looks clean to the eye, but I'm hesitant to use electrical contact (no residue) cleaner on it unless it's absolutely necessary.

The first Torque Pro log below is from just before the CEL occurred when I pulled up to a stoplight. The second log is from a few seconds after the CEL occurred as I was pulling away from the stoplight.

Log #1: Pre-CEL

Time: 04-Apr-2012 09:02:15.096
Speed: 0.979mph
Bearing: 341.0
G(calibrated): 0.00141555
Fuel Trim Bank 1 Short Term(%): 0
Fuel Trim Bank 2 Short Term(%): -1.5625
Fuel Trim Bank 1 Long Term(%): 0
Fuel Trim Bank 2 Long Term(%): -0.78125
Engine Coolant Temperature(°F): 184.99999595
Engine Load(%): 2.35294127
Engine RPM(rpm): 691
Mass Air Flow Rate(g/s): 6.25
Throttle Position(Manifold)(%): 2.35294127
Fuel used (trip)(gal): 0
GPS vs OBD Speed difference(mph): 0.35807136
Transmission Temperature(Method 3)(°F): 184.99999595
Acceleration Sensor(Total)(g): -0.01302952
Acceleration Sensor(X axis)(g): 0.00555366
Acceleration Sensor(Y axis)(g): -0.03887559
Acceleration Sensor(Z axis)(g): 0.01943775

Log #2: Post-CEL

Time: 04-Apr-2012 09:03:56.093
Speed: 5.597mph
Bearing: 2.0
G(calibrated): 0.06632715
Fuel Trim Bank 1 Short Term(%): -3.125
Fuel Trim Bank 2 Short Term(%): -7.8125
Fuel Trim Bank 1 Long Term(%): 0
Fuel Trim Bank 2 Long Term(%): -0.78125
Engine Coolant Temperature(°F): 197.59999561
Engine Load(%): 10.1960783
Engine RPM(rpm): 823.5
Mass Air Flow Rate(g/s): 9.75
Throttle Position(Manifold)(%): 14.11764717
Fuel used (trip)(gal): 0
GPS vs OBD Speed difference(mph): 0.62137121
Transmission Temperature(Method 3)(°F): 197.59999561
Acceleration Sensor(Total)(g): 0.03373463
Acceleration Sensor(X axis)(g): 0.17216341
Acceleration Sensor(Y axis)(g): -0.31378168
Acceleration Sensor(Z axis)(g): 0.13189937

Thanks for any help you all can provide!