Has anyone had experience with the Autothority DME affecting their Idle? I found this excerpt:

"This is a temperature sensor. The information from this sensor travels directly to your DME unit. Based on received information, DME desides to inrich or lean out the mixture. IMPORTANT NOTE: many DME chips are programmed to interfere between the reading of this sensor, and your DME unit, by telling the DME unit "the sensor reports "Cold Engine" condition" even though the engine is hot. In turn, the DME unit creates a "rich" condition, allowing a little faster operation by fooling your plugs, oxygen sensor, and exhaust valves. Stay away from these chips! When buying an unknown manufacturrer's chip, always ask for details of it's operation."

My car was actually running LEAN. When I took it for a CO adjustment, the car would start idling fine...then it would drop to a lean condition as soon as the idle began to lope. Disconnecting the O2 sensor kept the idle at the right CO level, but the car still seemed to lope...

**Also** the car seems to idle very well when it is cold, but becomes unstable as it warms up.

 

bump...anyone make sense of this? Its part of an add from 9thstreetauto on ebay.

 

I had a problem with the idle on mine but itturned out to be a faulty TPS. (I have autothority chips.)

 

Ok, I'll order one. If I remember correctly, the car idled about the same when I had the old chip (even worse since the AFM needed re-tracking).

 

Alot of the 'listers really think the Guru set up is better. My chips came with the car when I purchased it. (They were just sitting in a box in the glove compartment.) I am happy with mine, but I have not been in a car with the Guru setup.

 

My chip came with the car upon purchase as well. With the receipt. It was apparently serviced at Autothority early on in its life, and this idle issue has come up before. Apparently it has yet to be solved! With the TPS, I forget..do they come callibrated to factory spec or is there adjustments that need to be made? Reason I ask, is one of the shops I've been to messed with my existing TPS and AFM settings. Still...horrible idle.

 

Although maybe I am being ****. As I have never seen another 944S to compare the idle, but compared to the '86 944...it is horrible. I have been told by a shop that all 944S's are this way (I believe it was their excuse for not sorting out the problem).

I'll replace the TPS ASAP. It seems to be the most popular solutions to idle problems I've seen others have.

 

All S's don't idle poorly.

Mine idles steady at 1000rpm.
Hot or cold.

 

Isn't the stock idle supposed to be at 850-950rpm?

Mine idles around 800-900.

 

My idle did the same thing: good when cold and erratic when hot. The final straw was when I let off the gas and the idle wouldn't drop below 2k RPM. I could pat the gas sometimes it would come back down, other times I could tap the TPS and it would come back down. (It was adj correctly with the click at "off idle.") Plus it had some hesitation (lack of smoothness) when slowly pressing down the gas pedal. (Freeway on ramps.)

I replaced the TPS and it has even solved a problem with the eng loping with the a/c on.

 

That describes my situation exactly, except for the idle getting stuck. Mine clicks and everything, I'll order the TPS and give you all an update. How difficult did you find the replacement? I haven't checked to see how it mounts...

 

I'm not sure what the idle on the S should be. I don't think that it can be ajusted.

I know the idle on my 84 is 900. And the S runs higher. I don't know if the extra 8 valves makes a difference?

I was also thinking about replacing my TPS but it looks like a real pain to remove on the S.

 

It took about 15-20 minutes. My set up is different than yours. I had to remove the air cleaner, the blow off valve line to get to the bottom screw. I'm sure it could've been done easier but the bottom screw was stuck.

 

OK, I think my entire intake has to be pretty much removed. Not too bad. Anybody done this on their S?

 

I don't know if I fall into this category or not. Autothority did my DME-car has a nice cam-my lope at idle (850-900), but the idle is consistant. It has a large WebCams cam-so I expect the lope. Car does smell very rich, but the plugs do not foul...

I've been trying to solve a high idle ever since my shop "adjusted it" on their own-they raised it until it idled smooth (1000). I have not set the CO2, but just adjusted the idle, and made sure the TPS closed. It idles fine 99% of the time, but every once in a while it will "stick" high, or surge a little. I wonder if that is because of the DME-I'll keep checking this post...