Mui

Hey everybody,

Got myself a 92' 928 gts last year and its beautiful but there are some problems. I've replaced the timing belts etc when the car was first bought and sent to the workshop.

1.Both windows are stuck in up position and when pressing the up or down button causes the volt meter to go down.

2.On braking the volt meter jumps erratically.

3.The lower center vent doesn't blow air.

4.A/C isn't cold.

5.Starting the engine takes a bit of time maybe a second or two.

It looks like its mostly electrical. Could it be an alternator problem? I plan to send it to the mechanic sometime later in the week but is there something I should know beforehand? Just like everybody from brunei got it at an auction with low mileage. Still loving it though.

SteveG

Welcome.

"Search is your friend" Start by reading the new visitor thread. In that thread, one of the suggestions is to give as much information as you can. For example, no. 4, I will assume (dangerous) everything else is operating OK and guess it is your heater valve. But that is only one of several parts of a fairly complicated system and with the information provided, it is impossible to tell. No. 5 is probably normal, the computer needs 2 complete revolutions before it gives signal to fire.

3. go to : http://www.dwaynesgarage.norcal928.org/ He has a write-up on the Heating/air system with pictures.

joejoe

My '86.5 had similar sypmptoms described in 3 and 4. On mine the vacuum pot for defrost had split years ago and to stop vacuum leak I capped off line. The defrost defaults to open and center vent never had good output. Also I noticed the a/c was not working as it should (cool, but not cold) Finally got around to replacing all split vacuum pots and output is very cold and stronger from both center vents and side vents. I believe (just guessing here) that when defrost vent defaulted it screws up the air flow causing a 'dead static' area in box not allowing air to flow by evaporator.

Another possibility is the fresh air pot have torn and it has defaulted to open. If so then you cannot get max cooling as outside air is always entering system. To check vacuum on all pots (I think wil be same on gts) remove driver side center consul cover and near front you will see the vacuum lines connecting to sylinoid actuators. Remove each (one at a time) and check to see if they hold vacuum with a mighty vac.

Replacement is another story as some disassemby of dash is needed. I do not know what needs be done with air bags systoms but others here may. Hope this helps.

SteveG

Air bags????

Rob Edwards

IIRC Brunei is a RHD country, and even the GTS's there still had the older, non-airbag dash. Even if it is an airbag dash-ed car, that shouldn't affect getting at the recirc/fresh air pod.

Hilton

Welcome to Rennlist - you've come to the right place to get help and advise, so thats an excellent start to your ownership Firstly - you're not alone. There are at least 3 other members of Rennlist who're in Brunei. Check out post 8 in this other thread:

https://rennlist.com/forums/928-foru...ed-928-s4.html

(the original poster of that thread is also in Brunei - but less experienced with 928's than the other two). They'll be able to at least suggest reliable workshops and advise you on where/how to get parts shipped from so you're not paying insane money for them.

Second.. on your points above:

1. Sounds like the motors are jammed - could be as simple as seized bearings.

2. and 5. - you need to start by cleaning the ground points on your car.. Your car has the same ground points as the '87 S4, and cleaning all the electrical ground points will often fix many gremlins on these electrically-complex cars. This thread has excellent pictures and walk-through of the basic electrical clean-up jobs: https://rennlist.com/forums/928-foru...f-grounds.html

3. and 4. - the lack of air from the lower part of your center vent means the comb flap isn't working - this is usually the first vacuum actuator to fail in the A/C system, and once there's a vacuum leak, then other functions like the hot-water valve control don't work properly either. You can buy just the comb-flap diaphragm on its own through Roger of 928srus.com, but first you should talk to other local owners and plan what other parts you need to order at the same time, such as fuel lines (phone or email 928srus.com - they don't really have an e-commerce website). There are a few write-ups for testing the vacuum system, but by far the most comprehensive is this one by Dwayne: https://rennlist.com/forums/928-foru...re-w-pics.html

5. Could be the ground points, could be the starter motor, or it could be engine-related. You'll need a more experienced 928 owner to help diagnose - but if you clean all the ground points first and check the battery charge that'll be an excellent starting point.

6. Drain the oil and switch to a decent 20W50 with zddp in it - talk to the local owners to find out which good oils are available locally. Do NOT let your workshop put 0W40 or 5W40 in it (they'll say "its Porsche Approved" - but per your owners manual, for your climate, you need 20W50. What's good for a modern Porsche isn't the same as your car's needs).

7. Enjoy your car

Hilton

Yep, Brunei is RHD, and yes, RHD didn't get airbags until 93 model year, so a RHD 92 GTS has no airbags.

Vilhuer

Airbag, not bags. Only drivers side has it on RHD in '93-95 MY. Factory never bothered to make RHD bag dash.

Mui

Thanks everybody. I sent it to the mechanic and he fixed the windows and the engine idle. Turns out the the window motor seized up and as for the engine he adjusted the engine idler regulator. The erratic volt meter was solved by servicing the alternator. I'll clean the ground points during the weekend. I plan to maintain the car myself to the extent of my abilities.

Koenig-Specials 928

Wow!. Sounds like you're ready to get your hands dirty like the rest of us. Very rewarding when when you go for a spirited drive afterwards. Welcome aboard!

Dave928S

Welcome ... time for some pics of your car .. we'd all love to see it.

Cheburator

Correct as always - RHD 5 spd GTS here (MY93) and no passenger airbag in sight...

FredR

You should get in touch with "Z". Alas we have not seen or heard from him for quite some time. Maybe the car you have is the one he purchased? That was an immaculate 92 prior owned by the Sultan. He found a goodish mechanic.

If the car is a purple colour then it may be one I saw at house in Bandar Seri Baghwan on the way through to the airport after a visit to BSP about 5 years ago.

There's plenty you should know about 928's not least of which is their ability to empty your wallet. Stonking car when it is well sorted but these things like to run- not sit in garages.

Good luck- plenty of help on this list should you need it.

Regards

Mui

I did but he hasn't replied. Anyway I'll get the pictures soon but I need some help with air conditioning. I sent the car to the air con shop for a recharge recommended by the mechanic at RNF and the car is installed with a parallel condenser. He said he couldn't do it unless it was the original, his reasoning was that the condenser installed wouldn't cool the refrigerant fast enough and that the pressure was wrong causing the compressor to work too hard. He checked for pressure on a valve under the jump start terminal. I've read on another thread that parallels shouldn't be a problem. Is he right?

Hilton

Did you actually send him a Private Message, or just leave that note on his profile page? I'm not sure the profile page messages result in a notification. His profile says he's been here in the last week.

PM to him might work better:
https://rennlist.com/forums/private....=newpm&u=67528