Momentary rpm surge from idle

[Brian Sims]

----- Original Message ----- 
From: "Brian Sims" <sims at miliserv.net>
To: "Kent McLean" <kentmclean at mindspring.com>
Sent: Monday, November 28, 2005 5:18 PM
Subject: Re: Momentary rpm surge from idle


>  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?
> ----- Original Message ----- 
> From: "Kent McLean" <kentmclean at mindspring.com>
> To: "Brian Sims" <sims at miliserv.net>
> Cc: <quattro at audifans.com>
> Sent: Monday, November 28, 2005 5:54 AM
> Subject: Re: Momentary rpm surge from idle
>
>
>> Brian Sims wrote:
>> > I have been unable to find a cause for an intermittent rpm surge
>> > in my 1990 type 44 with an NF motor. I hope someone else has
>> > experienced this and found remedy. It only occurs at idle, in or
>> > out of gear and is only momentary. There are no codes and all the
>> > usual diagnostics passed.
>>
>> It sounds like an O2 sensor, but that should throw a code.
>> When was it last changed?
>>
>> --
>> Kent McLean
>> '94 100 S Avant, "Moody"
>> '89 200 TQ, "Bad Puppy" up in smoke
>>
>>
>>
>