Question about 1990 Porsche 928
When I initially got my 928 GT, I got it at a great price, assessed value from an appraiser was nearly double what I paid for it!
now, there are the obvious electrical gremlins, but the body is in great shape, and for the most part it runs exceptionally well.
Now, here are my two problems, for the most part, the engine has run great, but sometimes runs a little rough, and after running it through a high pressure wash, it stalled out, couldn't figure out why at first, ultimately determined water got in through the intake, popped off the air filter, which I discovered had a sizeable crack in the seal (had already made plans to get it up to a Porsche mechanic in Calgary to fix the few things wrong with it), found that debris had gotten through the crack, and was sitting on the screen, I removed the debris (and later put silicon sealant on the crack to reduce the problem until I can find an air filter for the car), assuming smaller debris had gotten through the screen....started the car with the air filter off....after a few tries it quickly roared to life...problem solved, however with the debris, I suspect the engine has gotten some **** in it, as it hasn't been running perfectly....will an engine shampoo solve the problem? or am I looking at some costly repairs?
Now, the other thing (and I suspect it's connected to the diff. issue), when I got the car, PSD light was on, meaning the PSD had been disengaged due to some problem.....that was one of the things I'd planned on getting fixed in Calgary....now, one thing I absolutely LOVE about my 928, is that while it might not corner quite as well as some other cars I've owned or driven, it's an AMAZING drift car....NEVER experienced a car that was so easy or precise to control while sliding sideways at high speeds.....anyway, one day when I took a female friend of mine for a drive, I drifted a few corners, and found that around the 4000-5000 rpm mark there was significantly less power than normal, and a great deal of vibration in the shifter accompanied by a bone chilling rattle that sounded like gears grinding behind me....also, tires weren't spinning like usual, not entirely clear on the drivetrain setup of the car, but from what I understand of it, this is a good sign the differential is going.....is this the case? will the Diff (which I understand is amazingly durable in this car) need to be replaced? or will a simple rebuild do?
plz....I need to know what kind of expenses I'm looking at here...so I can budget....(I do have approximately $4000 to put into the car, but there are other things I'd like to get done as well.)
I just bought a 1990 928s4 and it also has the PSD light on, meaning the PSD had been disengaged due to some problem....
I was wondering what jhudes on Oct 15, 2008, found out about the problem, and what work was done to fix it, and the ultimate cost
Posted on May 06, 2010
Let me give you my heart felt feelings of sadness for you. I love the 928's. They are positively one fo the best touring / GT cars ever produced. But they have a huge failing, the electrical system. I worked for Porsche for 15 years and I have seen some wild S**T in those electrical systems. Why Porsche decided to put the fuse / relay panel right below a huge hole in the cowl that will, someday leak, is beyond me. The 928 is the most expensive Porsche to own now. You know just try to find parts and when you do they are gold. As a mechanic I had to finally sell my 928 GT S4 because I could not keep it. But I can keep my Lotus Esprit S4 and Hummer H1 because the 2 of them did not cost as much to keep.
Doing a 'top end' cleaning, if this is shampooing will always be a good thing. Also if there was a crack in the intake after the MAF sensor (thing with screen) the previous owner whould have to have the diaphram adjusted (little hole in the middle of the octipuss) to compensate. This takes a special, very long allen on a swivel end to adjust. Again this has to be done be a qualified mechanic.
Unfortunately without having my hands on the car I really have to say get it to a qualified person and leave it there. A true "friend of Porsche" will work with you and try to keep costs down by working on it in down time. There are a lot of prople that dont know the 928 find an old time Porsche guy that just loves the cars. Good luck.
Posted on Nov 01, 2008
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Posted on Jan 02, 2017
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