04 Jetta Wagon 2.0 BEV
 

Cruise control won't maintain constant speed above 60 mph - it surges.
New fuel filter; fuel pressure is 65 psi (4.5 bar) at 4K rpm; new plugs.
I'm thinking coil pack? throttle body? Any help appreciated. TIA.

Steve

04 Jetta Wagon 2.0 BEV
 

On 8/15/2011 10:57 AM, Steve wrote:
> Cruise control won't maintain constant speed above 60 mph - it surges.
> New fuel filter; fuel pressure is 65 psi (4.5 bar) at 4K rpm; new plugs.
> I'm thinking coil pack? throttle body? Any help appreciated. TIA.
>
> Steve

OK, first I know nothing about this cruise control specifically. But I'd
suspect something other than engine components if the symptoms are only
present when the cruise control is used.

--
I'm never going to grow up.

04 Jetta Wagon 2.0 BEV
 

On 8/15/2011 1:09 PM, PeterD wrote:
> On 8/15/2011 10:57 AM, Steve wrote:
>> Cruise control won't maintain constant speed above 60 mph - it surges.
>> New fuel filter; fuel pressure is 65 psi (4.5 bar) at 4K rpm; new plugs.
>> I'm thinking coil pack? throttle body? Any help appreciated. TIA.
>>
>> Steve
>
> OK, first I know nothing about this cruise control specifically. But I'd
> suspect something other than engine components if the symptoms are only
> present when the cruise control is used.
>

Ok, I did leave out some additional information. When not using cruise
control the speedometer needle starts to bounce around 70 mph. I can
maintain a constant speed per my GPS but the needle bounces. The RPM's
do remain constant however when this happens.???

Thanks
Steve

04 Jetta Wagon 2.0 BEV
 

Ah, never leave out information! <bseg>

Digital speedometer, so check the speed sender (likely either at a wheel
or the transaxle) and wiring. Reseat your connectors as they may be the
problem. Often this is caused by some iron filings on the sensor (which
has a magnet init) which reduce its sensitivity. In fact, my money is on
the sensor either being dirty or failing causing a weak signal.

This problem must be fixed before even thinking about checking other
components--the cruise control is simply getting bad speed data which
causes your surging.

On 8/15/2011 9:52 PM, Steve wrote:
> On 8/15/2011 1:09 PM, PeterD wrote:
>> On 8/15/2011 10:57 AM, Steve wrote:
>>> Cruise control won't maintain constant speed above 60 mph - it surges.
>>> New fuel filter; fuel pressure is 65 psi (4.5 bar) at 4K rpm; new plugs.
>>> I'm thinking coil pack? throttle body? Any help appreciated. TIA.
>>>
>>> Steve
>>
>> OK, first I know nothing about this cruise control specifically. But I'd
>> suspect something other than engine components if the symptoms are only
>> present when the cruise control is used.
>>
>
> Ok, I did leave out some additional information. When not using cruise
> control the speedometer needle starts to bounce around 70 mph. I can
> maintain a constant speed per my GPS but the needle bounces. The RPM's
> do remain constant however when this happens.???
>
> Thanks
> Steve


--
I'm never going to grow up.

04 Jetta Wagon 2.0 BEV
 

Speedo is analog.

On 8/16/2011 8:05 AM, PeterD wrote:
> Ah, never leave out information! <bseg>
>
> Digital speedometer, so check the speed sender (likely either at a wheel
> or the transaxle) and wiring. Reseat your connectors as they may be the
> problem. Often this is caused by some iron filings on the sensor (which
> has a magnet init) which reduce its sensitivity. In fact, my money is on
> the sensor either being dirty or failing causing a weak signal.
>
> This problem must be fixed before even thinking about checking other
> components--the cruise control is simply getting bad speed data which
> causes your surging.
>
> On 8/15/2011 9:52 PM, Steve wrote:
>> On 8/15/2011 1:09 PM, PeterD wrote:
>>> On 8/15/2011 10:57 AM, Steve wrote:
>>>> Cruise control won't maintain constant speed above 60 mph - it surges.
>>>> New fuel filter; fuel pressure is 65 psi (4.5 bar) at 4K rpm; new
>>>> plugs.
>>>> I'm thinking coil pack? throttle body? Any help appreciated. TIA.
>>>>
>>>> Steve
>>>
>>> OK, first I know nothing about this cruise control specifically. But I'd
>>> suspect something other than engine components if the symptoms are only
>>> present when the cruise control is used.
>>>
>>
>> Ok, I did leave out some additional information. When not using cruise
>> control the speedometer needle starts to bounce around 70 mph. I can
>> maintain a constant speed per my GPS but the needle bounces. The RPM's
>> do remain constant however when this happens.???
>>
>> Thanks
>> Steve
>
>

04 Jetta Wagon 2.0 BEV
 

On 8/16/2011 10:20 AM, Steve wrote:
> Speedo is analog.
>

There's a difference between analog and mechanical. I don't think there
is a speedometer cable in an 04... But I could be wrong, so I'll check
to be sure, just as soon as the Internet comes back up...

--
I'm never going to grow up.

04 Jetta Wagon 2.0 BEV
 

On 8/16/2011 11:59 AM, PeterD wrote:
> On 8/16/2011 10:20 AM, Steve wrote:
>> Speedo is analog.
>>
>
> There's a difference between analog and mechanical. I don't think there
> is a speedometer cable in an 04... But I could be wrong, so I'll check
> to be sure, just as soon as the Internet comes back up...
>

OK, did some checking and everything I find says it is electronic
(digital) with an analog readout. Check the sensor, and try cleaning it
first.

--
I'm never going to grow up.

04 Jetta Wagon 2.0 BEV
 

On 8/16/2011 12:32 PM, PeterD wrote:
> On 8/16/2011 11:59 AM, PeterD wrote:
>> On 8/16/2011 10:20 AM, Steve wrote:
>>> Speedo is analog.
>>>
>>
>> There's a difference between analog and mechanical. I don't think there
>> is a speedometer cable in an 04... But I could be wrong, so I'll check
>> to be sure, just as soon as the Internet comes back up...
>>
>
> OK, did some checking and everything I find says it is electronic
> (digital) with an analog readout. Check the sensor, and try cleaning it
> first.
>


Worth trying. Thanks.

04 Jetta Wagon 2.0 BEV
 

There is a plastic speedo drive gear in the transmission. They like to break
causing the flaky needle on the cluster.

"Steve" > wrote in message
...
> On 8/16/2011 12:32 PM, PeterD wrote:
>> On 8/16/2011 11:59 AM, PeterD wrote:
>>> On 8/16/2011 10:20 AM, Steve wrote:
>>>> Speedo is analog.
>>>>
>>>
>>> There's a difference between analog and mechanical. I don't think there
>>> is a speedometer cable in an 04... But I could be wrong, so I'll check
>>> to be sure, just as soon as the Internet comes back up...
>>>
>>
>> OK, did some checking and everything I find says it is electronic
>> (digital) with an analog readout. Check the sensor, and try cleaning it
>> first.
>>
>
>
> Worth trying. Thanks.

04 Jetta Wagon 2.0 BEV
 

LM wrote:
> There is a plastic speedo drive gear in the transmission. They like to break
> causing the flaky needle on the cluster.
....

Makes a noise you can hear (with the radio off) does it?