tonyc

Just got the car back from the annual oil change. Oil filter, fuel filter have been replace as well as an air con hose. Air con seems to work better now but car seems to have lost a bit of it's grunt. Doesn't feel as tight.

Any suggestions?

Just want to be armed with questions for my mechanic.

Thanks
Tony
90 C2 36000 miles

AK

Have you checked that the oil was not over filled?

914und993

Its possible that your mechanic disconnected the battery while doing his work. If so, it might take the DME a little while to relearn optimal fuel/ignition parameters - though I suspect it doesn't take very long.

Anyone have any information on this?

Chip

Ade - C4 91

It's difficult to make comments about power loss or a perceived feeling of powerloss, because it's a very subjective issue.

I notice that when my mechanics have reset the DME, the power is more linear initially (also smoother) which feels less powerful (less torque). But over a period of time this seems to change (perhaps the effect of the DME adapting to sensor inputs) and the engine starts to go back to its old self again.

Perhaps give it a few runs to see how things go.

Good luck
Ade

tonyc

Thanks for your suggestions guys.

Ade I agree it is a subjective issue and perhaps need to drive a bit more to see if it sorts itself out or whether it is my imagination. This was on the drive back from the mechanics so was on the look out.

Haven't driven it since and will do again this weekend.

Tony

Bins

That could be why my 993 felt so much smoother after the wiring harness recall. The battery could have been disconnected. So when I got the car back the DME hadnt fully adapted?

Ade - C4 91

hi bins,

I would say that if you had a wiring harness replaced in your 993 then the battery will certainly have been disconnected and the DME reset. I expect that your mechanics will have fully adapted the settings before giving the car back to you and that's why it was so smooth.

It's only when you disconnect the battery yourself that you will need to go through a 10-15 minute drive for adapting the setting, but in my experience this is never as satisfactory as a Hammer adaption for some reason. Perhaps someone else has an idea why this?

Ade.

joey bagadonuts

Tony,

Not sure if you're aware of this but the quick way to determine if you have too much oil is to check the oil level gauge. It sits in the same housing as the fuel level marker. If that needle moves when you first start up and pull out, then you have too much oil. It shouldn't really register until the car has been warmed up.

Also, if it goes all the way to the top of the scale, and you're temp gauge has yet to crest the 9:00 mark, then you have too much oil. To me, those are the most important indicators in the car and the ones I watch closely after getting my hawg out of the shop.

I'm sure you're familiar with the various gauges but it's something easily overlooked ... so I thought I'd chime in. No flame intended.

BTW, How many quarts did your shop charge you for? Anything over 10 (9.5 liters) is a sure sign that they've overdone it.

Finally, did you go to a heavier weight grade of oil? Switching from 0/30 to 15/50 may feel different especially if temps in your neck of the woods are still wintry.
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