Join Date: Apr 2005
Location: Marietta, GA, USA
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No Motronic codes on 164 base with A/T
In the process of troubleshooting a "surging" problem, I set out to check the codes on my 1991 164 b automatic. I tried about 10 times but pressing the button on the steering column produces nothing. Fred D's instructions say I should see a "slow flash"...but I get zilch.
The test button shows that the CEL is operational -- that far-left light illuminates just fine. Plus I saw it the other day when the problem manifested itself.
Thinking there might be a problem with the 20-year-old pushbutton, I unpluged it and attempted to summon the codes by shorting the two available wires for 2.5 to 5 seconds. Again, negative function -- no slow blink or 4-4-4-4.
Also, any suggestions on the base problem would also be welcome. It's weird: occasionally the engine will race without application of the accelerator. It does this at random...except...I noted that if I press down on the intake plenum, I can re-create the problem. Literally: if I lean again the "Alfa Romeo" wording on the plenum, the engine revs to 1500 or so.
After poking and prodding all wires (spark-type included) and hoses in the vicinity, I'm thinking air leak. But prior to dissembling the whole air intake system, I'd really like to know if any codes have been thrown. (There must have been since the CEL came on.)
I must also note that the this problem has been intermittent. It did not pop up or interfere last Friday when the car passed emissions testing with its usual flying colors.
Any thoughts on the base problem or missing codes are welcome.
- Eric H., Marietta, GA, USA
Currently running: 2014 Ford Focus ST - 1994 164 LS
Past Alfas: two 105's, two 116's, two 162's, and three 164's.