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1999 volkswagon Jetta engine revs up high when I reach about 40 miles per hour

Tiny
PATTY40
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 130,000 MILES
I am driving and when I reach about 40 miles per hour the engine revs up I thought at first it was the Transmission it acts like its going to hang up on me this is an automatic and I took it to a shop replaced a sensor but thats not working.
Wednesday, February 1st, 2012 AT 6:54 PM

23 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Do you mean revs up like it's in neutral? Or like a downshift?
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Wednesday, February 1st, 2012 AT 7:29 PM
Tiny
PATTY40
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  • 39 POSTS
Like in neutral.
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Wednesday, February 1st, 2012 AT 7:36 PM
Tiny
PATTY40
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Whats the dfference I meant to ask if you dont mind.
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Wednesday, February 1st, 2012 AT 7:38 PM
Tiny
FIXITMR
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A downshift makes rpms jump but also slow car down with no feeling of power loss. Did you take it to dealer for diagnosis? Are any engine warning lights on?
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Wednesday, February 1st, 2012 AT 8:39 PM
Tiny
PATTY40
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  • 39 POSTS
Yes its more like the downshift your asking about it does lose power or try and quit. Dealer cant find out what the problem is.
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Wednesday, February 1st, 2012 AT 8:43 PM
Tiny
FIXITMR
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Still not sure what is exact symptom you are trying to describe. Are you saying it fails to shift into highest gear or it just takes longer than it should?
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Wednesday, February 1st, 2012 AT 10:04 PM
Tiny
PATTY40
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It try's to take off with me while I'm driving the Roma go way up.
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+1
Wednesday, February 1st, 2012 AT 10:20 PM
Tiny
FIXITMR
  • MECHANIC
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So rpms rev up with NO increase in speed? Or it downshifts and revs till it cant go any faster? I mean does it reach a high gear and go fine until this just happens fro no reason on your part?
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Wednesday, February 1st, 2012 AT 10:36 PM
Tiny
PATTY40
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  • 39 POSTS
It is running faster than it should do these jettas have an idle control motor?
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Wednesday, February 1st, 2012 AT 11:26 PM
Tiny
PATTY40
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  • 39 POSTS
It start doing the revving up about 40 miles per hour and when you slow Down its still running too fast.
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Wednesday, February 1st, 2012 AT 11:55 PM
Tiny
PATTY40
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It's going into gear don't think it's a Transmission problem.
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Wednesday, February 1st, 2012 AT 11:56 PM
Tiny
FIXITMR
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Did you get charged by dealer for not finding problem? They must be idiots!
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Thursday, February 2nd, 2012 AT 12:09 AM
Tiny
PATTY40
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No they just charged for the crankshaft position sensor that helped to car quitting and now it has this problem.I just wondered if it had to do with another sensor such a Idle control motor but don't know if that's what it's called on the Jetta.
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Thursday, February 2nd, 2012 AT 12:28 AM
Tiny
FIXITMR
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Did this problem start right after the other work was done?
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Thursday, February 2nd, 2012 AT 12:34 AM
Tiny
PATTY40
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Yes it did fix that problem.
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Thursday, February 2nd, 2012 AT 12:45 AM
Tiny
PATTY40
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I was wondering if it could be the Throttle Position sensor what do you think?
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Thursday, February 2nd, 2012 AT 1:12 AM
Tiny
FIXITMR
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You need to in very good detail explain problem again. Start with putting key in ignition and then start car and then.
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Thursday, February 2nd, 2012 AT 1:26 AM
Tiny
PATTY40
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Ok I'll get back to you tomorrow and go from there.
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Thursday, February 2nd, 2012 AT 1:37 AM
Tiny
FIXITMR
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You should have an electronic throttle on that model and possibly the throttle plate is dirty sticking and not relaxing when you let off pedal so when you accelerate it just keeps going after you let back to cruise.
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Thursday, February 2nd, 2012 AT 1:57 AM
Tiny
PATTY40
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Ok thanks I'll try a few things and let you know.
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Thursday, February 2nd, 2012 AT 2:01 AM

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