TheOtherEric

I started this thread in the 993TT forum. I'd really appreciate any help.

Bruce SEA 993

Here is what I posted over there...

What octane fuel are you running? Been discussed a lot about 92 vs 93 or 94 etc, etc.

I wounder if you are seeing the actual results of the ECU retarding the ignition vs our usual argument about "I can feel it" or I can't feel it at all and therefore it must be OK"

Robin 993DX

I have the scangauge II tool installed in my car that's hooked up to the OBD2 connector at all times, one of the item it monitors is the ignition timing so you can see what's going on in real time.

g_murray

I periodically run my Matco Scan Tool (OBD ii) whilst I'm driving to keep an eye on what's going on 'under the hood'. I don't have to keep on watching it (which would be dangerous!) but am able to set it so that it performs a 'save' whilst I'm driving (under various conditions). The stored results can prove to be very interesting 'reading'.

If you really want to know what's going on -- get yourself a scan gauge - in that way such 'prominent' items such as short and long-term fuel-trims, ignition advance, O2 sensor voltage values, etc. etc. can be inspected at will.

Gerry

TheOtherEric

I was able to determine that my ignition timing is *definitely* being retarded by the ECU, by like 5 to 8 degrees (which is a huge deal). So now the question is why. I only know of two reasons -- faulty Hall sensor or knock.

CornerCarver

Are scanners like these available for 95 OBDI ?