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Intermittent revs when cruising

PB987
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PB987 Member

PB987

Posted
Posted

When driving and cruising ... revs go up only very slightly but this happens every second or so continuous ...

 

Anyone got any ideas ...

 

Thanks Mike ...

PB987 Member

PB987

Posted
  • Author
Posted (edited)

Hi ...

Boxster 987-1

2005

tiptronic

Also last week new oil and filter ...

Mike...

Edited by PB987
PB987 Member

PB987

Posted
  • Author
Posted

Listen don't know who you are with the last help ... but if you going to give help on this website and to gain respect ... you will not get it in that way ... so on this occasion ... your advice is not helpful ...

  • Moderators
JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Listen don't know who you are with the last help ... but if you going to give help on this website and to gain respect ... you will not get it in that way ... so on this occasion ... your advice is not helpful ...

 

Slow down a bit.  While seeming odd at first blush, the questions asked are valid as either one of the suggested things to check could cause the circumstances you are encountering due to low level vacuum leaks, which are known to cause surging problems; particularly as you have just had an oil change .

 

I would also agree with Loren, get the car scanned with a Porsche specific diagnostic tool (PIWIS or Durametric) for both active and pending codes.  I would also look closely at both the fuel trim values and readings from the MAF at the same time.

PB987 Member

PB987

Posted
  • Author
Posted

apologies my friend ... have been around cars all my life ... it just seemed a bit odd ... but hey ... before oil change it was still doing the same fault ... the fault is just like overdrive on a car but every second ... once again sorry for my haste ...

  • Moderators
JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

apologies my friend ... have been around cars all my life ... it just seemed a bit odd ... but hey ... before oil change it was still doing the same fault ... the fault is just like overdrive on a car but every second ... once again sorry for my haste ...

 

Not a problem.  Sometimes the oddest sound suggestions are based in hard earned experience.

 

Get the car scanned, we need a bit more information before we can offer more sound suggestions.

Hilux2400 Member

Hilux2400

Posted
Posted

Listen don't know who you are with the last help ... but if you going to give help on this website and to gain respect ... you will not get it in that way ... so on this occasion ... your advice is not helpful ...

It's OK don't be concerned no offence taken, but as JFP said sometimes really simple things can cause problems.  I didn't know the car had the fault before the oil change as you didn't say, hence my assumption that the two were linked. Some people have never put oil in a car.  

PB987 Member

PB987

Posted
  • Author
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Ok ... What I have done is plugged into the OBD11 port nothing comes up all clear ... Admittedly My reader is not a Porsche reader ... I have spoken to a local Porsche specialist (http://porsche-repair-service.co.uk) she tells me it could be a sensor on the gearbox ... Possibly...

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Ok ... What I have done is plugged into the OBD11 port nothing comes up all clear ... Admittedly My reader is not a Porsche reader ... I have spoken to a local Porsche specialist (http://porsche-repair-service.co.uk) she tells me it could be a sensor on the gearbox ... Possibly...

 

Not to take anything away from your OBD II scan tool, but there are systems on these cars that a "global" OBD II scanner simply cannot access or read.  If your lady Porsche specialist has the diagnostic tool, I would let her have a look at it and the sensor she is questioning.

 

Without reliable diagnostics data, we are simply guessing and throwing out ideas.

PB987 Member

PB987

Posted
  • Author
Posted

Ok was trying to bypass the specialist but it seems that some things we can't do ourselves as I am a hands on car guy ...

For instance if a diagnostic tool that could find the problem cost say £200 I would rather buy one myself and fix the problem. But these readers cost thousands ...

Well looks like I am going to see her with the car ... Will keep all informed as to the outcome so we know the fault for future Porsche Boxster owners ...

Once again sorry for the mix up ... Mike ...

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

Ok was trying to bypass the specialist but it seems that some things we can't do ourselves as I am a hands on car guy ...

For instance if a diagnostic tool that could find the problem cost say £200 I would rather buy one myself and fix the problem. But these readers cost thousands ...

Well looks like I am going to see her with the car ... Will keep all informed as to the outcome so we know the fault for future Porsche Boxster owners ...

Once again sorry for the mix up ... Mike ...

 

http://durametric.com/

 

About 287 USD.

It will do most common DIY tasks and some professional tasks.

You can read what it does (for your model car) and it's limitations on their website.

  • 3 years later...
African Grey Member

African Grey

Posted
Posted

Your problem is:

4-5 gear driving at 40-50mph rpm moves +/-200 the LED's don't change.

Your problem can be one of the following:

1. Vacuum tube from the throttle body.

2. Faulty torque convertor

3. Faulty valves box.

 

Start with #1, then 2 then 3.

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