MarkD

Agree, check the bottom conn. on the boost hoses and look for defects in them.
Are they the updated, orange topped hoses?

Really doesn't sound like the MAF, especially the manner in which it failed.
You never know though! And if you can get your hands on one to swap/test, can't hurt.

Receiver

I had this problem as a warning that my DME relay was about to go. Replaced it and no more problems. Old one was a 944 part number.

ScottMellor

Good point. That's why we "Old Hands" cary a spare DME relay at all times.
I also agree that these cars are not particularly spendy in general.
I too just go over to Ferrarichat and peruse for 1/2 hour to get them out of my system.

993MAN

Works for me as well

Wilder

Heavy smoking, especially if it's the thick, white-cloud kind after the car has been running and not the light, blue, startup kind can be something as simple as an oil overfill, loose filler cap or wrong oil filters to more serious problems like turbo sump pump or blown turbos.

Has the car been serviced recently? If so, it might be one of the lesser evils. If not, it could be the turbo sump pump or a number of other issues related to the turbos. Driving your car with potentially oil flooding your turbos will kill your turbo seals and eventually could kill your turbos. You may want to stop driving the car until you understand the problem better or better yet, put the car on a flat bed and take it to a p-car specialist instead of assuming its something simple like DME failure.

I've seen blown turbos on a 25k mi car. The owner had a bad habit of not properly warming up the car or cooling down the turbos and I suspect at least the former is what led to turbo failure in his case. These cars are built like a tank and can take a lot of abuse but they need proper care. Not suggesting you're not but who knows about the habits of the previous owner?

Fingers crossed for you. Good luck.

Teza

Replacing the DME relay sounds good. I have located the DME relay in the fuse box and will try to source a new one...Porsche dealer or....?

I do not have a 993TT workshop manual.......yet. But will plan on getting one in the future.

For the moment, checking the left side intercooler hose , it has an orange top but not the left interccooler hose. Both intercooler hose ends are on tight as I just redid those when checking/removing the MAF.To check the lower intercooler hose connections I need to......start by removing the plastic bottom engine cover and maybe it will be obvious. But if not obvious, I would be grateful for some direction/location.

Greg H.

Ah shoot. I already sent you off the MAF. I could have tossed an extra DME in the box too.

Greg H.

Bradford

With the rear wheel, fender liner and the muffler removed, this is what it will look like. You can see the hose clamp holding the hose on the top of the turbo. It is not uncommon for these to come loose, ask me how I know

rinlv1

This sounds like what i was going through. When the bottom of the IC hose came off, i couldn't drive home. It would die after eratic idle, i could hold the rpm up but as soon as i let off engine dies. The bottom of the hose gets shredded due to heat and oil residue on the rubber. The condition of the hose might not be readily visible. I got a re-enforced set from www.fvd.de

Good luck.... btw your turbo wouldn't be that clean as in the picture and it's impossible to get the breeze clamps on there(like the picture) unless you have everything off.

Teza

If posting a problem, it is good taste to follow up if a solution is found. The right side boost hose on the turbo had slipped off.

Spent several hours learning about how to remove all the stuff to get to it. The Gemballa muffler bracket was my undoing. I could not get the upper 5mm allen bolt lose to pull off the bracket. I need a much, much longer 5mm allen tool to get to it from the top side engine compartment. So I had to get the boost hose back on and the clamp on with it in place.

It appears that the boost hose may come off again as the flared end of the hose was gone and so the hose was about a 1/4" shorter. Yes, it already is the orange reinforced boost hose.

I checked the fvd.de site and maybe I should lick up a set of boost hoses when I am in Frankfurt next week. But maybe there is a closer better price location here in the USA?

Again, thanks for all your replies to my problem. And thanks to my 993TT for giving me the opportunity to learn about diagnosing problems, removing the DME, MAF, air cleaner, muffler, jacking the car up and actually learning where the lug nut lock wrench socket is for my BBS LM mag wheels.

Teza

I again see why I could not remove the muffler braket allowing better access to the lower left boost hose at the turbo. The post outlining turbo removal has diagrams indicating TWO socket head allen bolts on either side of the boost hose that need to be removed. I thought it was just one. And another TWO socket head allen bolts that are accessd horizontally in the legs of the muffler bracket. I did not remove those as I could remove the engine top side ones with current tools available.

Wilder

Glad to hear it was something simple.

rinlv1

fvd has an outlet and ships out of Florida.

DivineE

I'd almost bet my life on it being a boost leak like a split hose. The black smoke, stall when revved from idle, zero boost on guage all fit.

MAF failure doesn't do all those things, only rough idle. Also if you disconnect the MAF so it stops metering air and runs on a set map / lambda sensor readings it would be an improvement over using totally wrong readings from the maf which will be drawing in way more air than is reaching the engine (hense rich running) ECU assumes all that air makes it to cylinders.. even if its bleeding out of a hole.

Quadcammer

Didn't read the thread huh?