1999 S70 Non-turbo - Cruise Control Fluctuates
1999 S70 Non-turbo - Cruise Control Fluctuates
The cruise will set and hold speed, but it constantly fluctuates up and down. Has a Xemodex throttle body replacement. Could this be a vacuum leak?
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wizechatmgr
- Posts: 1798
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- Year and Model: 1999 V70 XC AWD 2.4T
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How much are we fluctuating? Are there hills/downgrades involved?
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD 2.4 T -- ~231k miles
1998 V70 2.4 NA -- ~184k miles
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD 2.4 T -- ~231k miles
1998 V70 2.4 NA -- ~184k miles
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abscate
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- Year and Model: 99: V70s S70s,05 V70
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Oh, that's not good. Cruise on a ETB car like your 99 is totally electronic, sosomething is wrong with the ETB.
How big speed fluctuations are you Seeing?
How big speed fluctuations are you Seeing?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
Link to Maintenance record thread
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precopster
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The controlling program for cruise is in the cluster on 99s and 2000s.
The cruise speed can't be held on downgrades (will over speed) and steep hills. Engine condition will determine whether it can hold cruise comfortably up a grade but there's a limit to how well it can do this. Is the throttle clean? A dirty throat can affect airflow and performance. How are spark plugs and air cleaner? How is cylinder compression?
The cruise speed can't be held on downgrades (will over speed) and steep hills. Engine condition will determine whether it can hold cruise comfortably up a grade but there's a limit to how well it can do this. Is the throttle clean? A dirty throat can affect airflow and performance. How are spark plugs and air cleaner? How is cylinder compression?
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design
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Darkfleet
- Posts: 29
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I had a similar issue on my 99 v70 - turned out to be a bad wheel speed reluctor ring on the front. My cruise would jerk forward on and off even though speed was still reading properly.
Check your rings and maybe clean up the wheel speed sensors.
Check your rings and maybe clean up the wheel speed sensors.
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