04-03-2007, 11:39 AM
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#1
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Registered User
Join Date: Apr 2007
Location: Eastbourne
Posts: 6
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Gutless above 4500rpm
Hi, my friend just bought a 1999 2.5 Boxster and I`m just wondering if it has a problem.
When you accelerate it does not want to pull above 4500rpm. The acceleration completely dies and the revs just creep up. Its pretty good low down and up to this point but drops off when it hits 4500. Does anyone kn ow what could be causing this? Or is it just normal?
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04-03-2007, 11:46 AM
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#2
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Guest
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Quote:
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Originally Posted by BBoxster
Hi, my friend just bought a 1999 2.5 Boxster and I`m just wondering if it has a problem.
When you accelerate it does not want to pull above 4500rpm. The acceleration completely dies and the revs just creep up. Its pretty good low down and up to this point but drops off when it hits 4500. Does anyone kn ow what could be causing this? Or is it just normal?
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something must be wrong,the cars only good above 4500rpm 
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04-03-2007, 11:58 AM
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#3
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Registered User
Join Date: Feb 2007
Location: Austin, TX
Posts: 65
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Yeah I agree with blkboxster, my car does its best after 4000.
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04-03-2007, 12:02 PM
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#4
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Registered User
Join Date: Mar 2006
Location: Minneapolis
Posts: 446
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Definately a problem! I'm not very technical so I can't help to 'diagnose' the problem, but you should be able to crank the RPM easily to redline in first and second gear. It shouldn't slow down at 4500RPM.
I'm sure some of the more technical forum members will be able to offer some insite regarding the cause.
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04-03-2007, 12:16 PM
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#5
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Registered User
Join Date: Apr 2007
Location: Eastbourne
Posts: 6
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Could it be the air flow sensor I had a similar problem on a VW and this was the problem. But I just read about the problem with the block on the 1999 I hope its not this??? 
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04-03-2007, 12:18 PM
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#6
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Guest
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Quote:
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Originally Posted by BBoxster
Could it be the air flow sensor I had a similar problem on a VW and this was the problem. But I just read about the problem with the block on the 1999 I hope its not this??? |
if its not your car who cares
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04-03-2007, 12:25 PM
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#7
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Registered User
Join Date: Apr 2007
Location: Eastbourne
Posts: 6
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Because I`m interested (Its how you learn stuff) and trying to find out for her whats up with it, ok with you?
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04-03-2007, 12:30 PM
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#8
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Registered User
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,243
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This symptom could be a lot of things. Bad MAF. A fuel line inside the tank could have come loose. Or, it could be something bad inside the engine because 4200 is right where the variocam kicks in...
Tell her to get it into a reputable repair shop asap.
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04-03-2007, 12:35 PM
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#9
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Registered User
Join Date: Jul 2006
Location: Where the Sewer Meets the Sea, CA. USA
Posts: 2,695
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Try unplugging the MAF then see if it still has issues with power past 4k rpm. If symptoms disappear, the MAF is the culprit.
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04-03-2007, 12:36 PM
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#10
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Guest
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Quote:
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Originally Posted by BBoxster
Because I`m interested (Its how you learn stuff) and trying to find out for her whats up with it, ok with you?
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um no its not, jk
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04-03-2007, 12:40 PM
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#11
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Hi,
Possible MAF issue, or maybe OČ Sensor. Another culprit could be the Fuel Filter. Depending upon mileage, he's likely due. It may flow enough to satisfy demand under 4500, but not capable of supplying the added fuel required above this mark...
Happy Motoring!... Jim'99
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04-03-2007, 12:58 PM
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#12
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Registered User
Join Date: Jul 2006
Location: Where the Sewer Meets the Sea, CA. USA
Posts: 2,695
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Quote:
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Originally Posted by blkboxster
um no its not, jk |
I know why you pick on me.... LOL jk
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04-03-2007, 01:04 PM
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#13
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Registered User
Join Date: Sep 2006
Location: San Carlos, CA
Posts: 166
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My '99 had the same problem. I thought it might be the rev limiter kicking in early. I cleaned the MAF and it got better, I replaced the MAF and the problem disappeared completely. Life between 4200 and redline on the 2.5 is heaven! 
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BoxsterBob - CA
2014 Boxster S
Previous - 1999 Boxster / 1972 914
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04-03-2007, 01:10 PM
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#14
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Registered User
Join Date: Sep 2005
Location: Sacramento
Posts: 3,417
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Quote:
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Originally Posted by BBoxster
When you accelerate it does not want to pull above 4500rpm. The acceleration completely dies and the revs just creep up.
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When you say the "revs just creep up" do you mean that the RPMs continue to rise sharply and at the same time the car's acceleration slows down almost like your putting your foot on the clutch? Could it be a slipping clutch?
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Last edited by blinkwatt; 04-03-2007 at 01:14 PM.
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04-03-2007, 01:32 PM
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#15
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Registered User
Join Date: Apr 2007
Location: Eastbourne
Posts: 6
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Cheers guys this is helpful.
Quote:
When you say the "revs just creep up" do you mean that the RPMs continue to rise sharply and at the same time the car's acceleration slows down almost like your putting your foot on the clutch? Could it be a slipping clutch?
It`s definatley not the clutch. the revs and the speed are both increasing just very slowley. To put it in perspective the road I can hit 130mph in my 323 bmw the boxster only just hit 100mph.
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04-03-2007, 01:44 PM
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#16
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Registered User
Join Date: Mar 2006
Location: Minneapolis
Posts: 446
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I really think you need a more detailed description of the problem for anyone to accurately take a guess on the potential problem.
Is the 'slow creeping' at 4500 RPM happening in low gears too (ie 1st). Or is this just happening when you are in 5th trying to go over 100mph. Which, by the way you shouldn't be doing anyhow unless you are on a track.
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04-03-2007, 01:51 PM
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#17
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Registered User
Join Date: Apr 2007
Location: Eastbourne
Posts: 6
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It was a private road not the highway!! I said it happens in every gear not just 5th.
To confirm:-
In every gear the acceleration dies off at around 4500rpm. There are no strange noises or anything else untoward that happens just the fact the car will not pull past those revs. If I change to the next gear the car accelerates well again until it hits that same 4500rpm.
Thats it I`ve described it as best as I can.
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04-03-2007, 01:55 PM
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#18
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Guest
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Quote:
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Originally Posted by BBoxster
It was a private road not the highway!! I said it happens in every gear not just 5th.
To confirm:-
In every gear the acceleration dies off at around 4500rpm. There are no strange noises or anything else untoward that happens just the fact the car will not pull past those revs. If I change to the next gear the car accelerates well again until it hits that same 4500rpm.
Thats it I`ve described it as best as I can.
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ive got the best idea take it to a Porsche service center and then you will know whats wrong with the car
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