Momentary rpm surge from idle

[Kent McLean]

Brian Sims wrote:
> Thanks for the reply Kent. The 02 sensor is new and is functioning well. 
> I have experienced the rpm fluctuations a poor 02 sensor causes on other 
> cars. It was more of a gradual surge with a rhythm, like a wave if you 
> know what I mean. This is abrupt, like a jab and bumps the rpm from the 
> base, around 750 to about 1100, randomly and only momentary with no 
> sequence to the event. It can happen once in a minute or even three 
> times, then disappear for five minutes or more. Weird huh?

I'd run a can (or two) of Techron through the gas tank, which
will help clean injectors and other FI pieces.  Then I'd try
to pull the DTC diagnostic codes.  That surge, in my mind, is
controlled by one of the sensors, which may be on its way out,
and which probably has thrown a DTC diagnostic code.

--
Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke