Slight Loss of Power from 2000rpm
#1
Slight Loss of Power from 2000rpm
Hi all, I'm new to the forum and Scoobies, just picked up a 98 Turbo (totally standard) and have a problem with a slight loss of power from around 2000rpm. The check engine light came on and was showing knock sensor fault. Had the knock sensor replaced, no more check engine light and it pulls better but the problem is still there. I've cleaned the injectors, replaced the plugs, again i noticed a slight improvement but the problem is still there.
It starts and idles fine but when it gets to 2k feels like you are just feathering the brake pedal every two seconds. it's only a small fluctuation but really annoying and is most noticable when on the motorway, feels like you're constantly lifting off and on the throttle. I'm wondering if it could be a dirty sensor or a dying fuel pump? Any suggests would be greatly appreciated!
It starts and idles fine but when it gets to 2k feels like you are just feathering the brake pedal every two seconds. it's only a small fluctuation but really annoying and is most noticable when on the motorway, feels like you're constantly lifting off and on the throttle. I'm wondering if it could be a dirty sensor or a dying fuel pump? Any suggests would be greatly appreciated!
#3
I don't know, the garage replaced the knock sensor and when i got it back the check engine light no longer came on (it was intermittent before i had the sensor replaced). Is it worth doing an ECU reset? I assumed the garage would reset it.....
#7
I'll try an ECU reset when i get home from work tonight.
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#9
Wow, I reset the ECU last night and it's worked! Apart from getting some strange looks by driving a mile down the road then getting out and messing with the ignition so that it looked like i was stealing it, all went to plan. It ran flawlessly to work this morning. I noticed a slight blip in revs at 2000 going up a steep hill but how the car drives has been completely transformed. Thanks for everyone's help, I really appreciate it.
Last edited by Khimaros; 03 January 2011 at 08:27 AM.
#10
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Give it a little time you can still have an issue there, the ecu now has to re learn, if the problem has gone then sorted but if its still faulty then it will come out again
Tony
Tony
#11
Right, understood. I'll keep my fingers crossed in that case. I really hope it's fixed though because it was phenomenal this morning
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Hmmmm they dont like 95 ron, it normally blows holes in the pistons and causes engine failure as they are mapped for 97+ ron, maybe one of the causes to your problems, this car NEEDS a minimum of 97 ron or the above can happen.
Tony
Tony
#15
Wow, I did not know that. Glad i found out sooner rather than later...
Just taken the car out for a good long drive on my lunch, as with everything i've done, problem is better but not gone. It will hold at 70mph without pulling back, it's only noticable when going up hill now.
I'll fill up with 97RON tonight and see if that makes a difference. Thanks.
Just taken the car out for a good long drive on my lunch, as with everything i've done, problem is better but not gone. It will hold at 70mph without pulling back, it's only noticable when going up hill now.
I'll fill up with 97RON tonight and see if that makes a difference. Thanks.
#17
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Wow, I did not know that. Glad i found out sooner rather than later...
Just taken the car out for a good long drive on my lunch, as with everything i've done, problem is better but not gone. It will hold at 70mph without pulling back, it's only noticable when going up hill now.
I'll fill up with 97RON tonight and see if that makes a difference. Thanks.
Just taken the car out for a good long drive on my lunch, as with everything i've done, problem is better but not gone. It will hold at 70mph without pulling back, it's only noticable when going up hill now.
I'll fill up with 97RON tonight and see if that makes a difference. Thanks.
Fill up with the highest octane available to you and even add an octane booster if necessary.
I take it when you did the reset, you got the 'all clear' code??
#18
I did indeed get the all clear code after the reset. It's a big improvement.
I've been reading up about octane ratings and the more i read, the more it makes sense that cheaper, low octane fuel could be causing my problem. I'd not really considered it before, i must admit.
I've been reading up about octane ratings and the more i read, the more it makes sense that cheaper, low octane fuel could be causing my problem. I'd not really considered it before, i must admit.
#20
Thanks again for all the help and advice.
#22
Yes. wife filled it with supermarket 95 and it exhibited the exact symptoms you described. On another occasion I was left with no opton but to fill with BP Ultimate. CEL illuminated for a few secs and the same symptoms arose and continued until I topped up with Tesco 99.
#23
Just a quick update guys, a couple of weeks ago i replaced the MAF sensor and have been running it on V-Power. I did an ECU reset when replacing the MAF. Still have the same problem. Think i'm going to have to check all my hoses for leaks as i'm running out of ideas.... :'(
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