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Slight hesitation and lumpiness about 2000 rpm

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AndrewMcDowell
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AndrewMcDowell PCGB Member
2019/03/26 16:50:40 (permalink)

Slight hesitation and lumpiness about 2000 rpm

So my S2 has been running without fault but lately seems to have developed a slight hesitation and lumpiness at about 2000rpm. If your decelerating it feels a bit jerky at about 2000rpm. If you put your foot down, once it has sorted its self out it pulls strongly. 
 
I changed the plugs, leads, distributor, rotor arm and condenser just over a year ago.
 
So at the moment i'm thinking a vacuum leak. Does anybody have any other ideas? 
 
Thanks, Andrew.
 

If anyone is interested... twitter: JAZ5788_Boxster
1990 944 S2 3.0 & 2004 Boxster 2.7 Mods: RSS Under drive pulley, Dan...ed s/s sports silencer, K&N air filter, M030 Sports Suspension, 997 Gear selector, and a load of other OEM styling upgrades.(262 > max. 255)

6 Replies Related Threads

    bmnelsc
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    bmnelsc Guest of the Club
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/03/29 04:18:40 (permalink)
    Any updates Andrew? 
     

    Bruce Nelson
    91 S2 Guards Red, Blk Script, sunroof delete, no air bags, no cruise
    AndrewMcDowell
    PCGB Member
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    AndrewMcDowell PCGB Member
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/03/29 09:24:24 (permalink)
    Hi Bruce, maybe. Last night I took off the accelerator cable and gave it a good dose with GT85, along with all the pivot points from the pedal to the throttle body. This morning's commute did seem a fair bit smoother. I've a longer run to do this afternoon so i'll know more then. If is was that, then another lesson in not overlooking the easy solution... 

    If anyone is interested... twitter: JAZ5788_Boxster
    1990 944 S2 3.0 & 2004 Boxster 2.7 Mods: RSS Under drive pulley, Dan...ed s/s sports silencer, K&N air filter, M030 Sports Suspension, 997 Gear selector, and a load of other OEM styling upgrades.(262 > max. 255)
    bmnelsc
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    bmnelsc Guest of the Club
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/03/31 19:08:58 (permalink)
    That is encouraging.  Hope that is problem solved. 
    I recently had my alternator replaced only to find that the battery cables had to be replaced also.  Little charge going to none when hot.  The cables didn't look that bad and didn't show serious voltage drop but once cables changed - all systems go.  The odd thing was using a multi-meter on the cable didn't show much drop - apparently getting pretty good connection on the outside of the cable but clearly badly corroded inside - couldn't transmit the load.  Another example of component OK but support system weak..
    post edited by bmnelsc - 2019/03/31 19:10:25

    Bruce Nelson
    91 S2 Guards Red, Blk Script, sunroof delete, no air bags, no cruise
    AndrewMcDowell
    PCGB Member
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    AndrewMcDowell PCGB Member
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/04/01 15:02:09 (permalink)
    Yup, which cables? Just the short pair in the boot? The car does feel better, I'm just running some injector cleaner through it too. So fingers crossed. 

    If anyone is interested... twitter: JAZ5788_Boxster
    1990 944 S2 3.0 & 2004 Boxster 2.7 Mods: RSS Under drive pulley, Dan...ed s/s sports silencer, K&N air filter, M030 Sports Suspension, 997 Gear selector, and a load of other OEM styling upgrades.(262 > max. 255)
    bmnelsc
    Guest of the Club
    • Total Posts : 751
    • Joined: 2010/07/22 19:51:43
    • Status: offline
    bmnelsc Guest of the Club
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/04/14 20:41:16 (permalink)
    Sorry for the late reply Andrew.  I'm in Canada so my car is left hand drive with battery under the bonnet right in front of where you sit :-)... Porsche sells the battery cables as a unit that includes both positive and negative cables as well as the small cables that run to the starter and alternator all sealed into a big grommet where the cables pass through the bulkhead into the engine compartment.  Longest cable is under 4 feet.

    Bruce Nelson
    91 S2 Guards Red, Blk Script, sunroof delete, no air bags, no cruise
    Sy924
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    Sy924 Guest of the Club
    Re: Slight hesitation and lumpiness about 2000 rpm 2019/04/17 14:17:09 (permalink)
    Might be well off track but there are reports of some S2s being a bit sensitive to dirty injectors. Might be worth running some injector cleaner through if the cable tweaking doesn't work.
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