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hesitation under 3000rpm
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Old 19 Feb 2006, 10:55 PM   #1 (permalink)
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Unhappy hesitation under 3000rpm

hi my99 is hesitating under 3000 just had new maf the ecu has been reset in the last 200 mile but still no fault codes all clear . could it be the oxygen sensor ?????? any help please cheers
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Old 20 Feb 2006, 08:34 AM   #2 (permalink)
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this normally does boil down to maf / lambda sensor as both needed to keep the car running smooth. other threads (search) suggest the cold weather will bring out the worst in a sensor.

Also may be worth cleaning Boost control solenoid...

Hope more will throw some comments in for you .

All the best
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Old 20 Feb 2006, 04:19 PM   #3 (permalink)
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cheers gareth i would like to get the scooby running right as have not owned it long thanks for your help
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Old 27 Apr 2006, 12:12 PM   #4 (permalink)
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my '99 classic turbo has the same symptoms and it has had a new maf and lambda sensor fitted... the fault codes have been cleared and haven't recurred... on the first start of the day, it is just ever so slightly hesitant up to 3000rpm but once past it its fine and there are no further problems for the rest of the day... apart from that the car is running 100%... how do i go about cleaning the boost solenoid without damaging it?... i know its working fine as i connected the diagnostic plugs under the dash and its clicking away fine...
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Old 27 Apr 2006, 12:41 PM   #5 (permalink)
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you will get the hesitation, its called turbo lag, it wont spool up till after 3k. just the normal lag on the car, difference between driving a norm asp car and turbo car is you need to keeps revs higher on turbo.
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Old 27 Apr 2006, 08:05 PM   #6 (permalink)
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i know about the turbo lag, i didn't describe the hesitation properly... it only happens on the first cold start of the day whereby as the revs are building towards 3000, the car seems just ever so slightly jerky as the boost is starting to build(very, very slight but noticable)... i never rev the car past about 3500rpm when cold... after the initial slight jerkiness, it never recurs again... the best way to describe it is as if the solenoid is filled with crap that clears once the boost builds until the engine is left overnight again... hence the request for advice about how to clean the pipe leading to and the boost solenoid itself...
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Old 02 May 2006, 07:43 AM   #7 (permalink)
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thanks for you help all fixed now new oxygen sensor the little 1.2 mm restricter was missing in the turbo pipe work and new spark plugs just incase one scooby flying again cheers all
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Old 18 May 2006, 04:51 PM   #8 (permalink)
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Just out of interest, how much was the work? I have same problem on my MY00 that I got a couple of weeks ago I don't really wanna fork out a load of cash, but if I have to I'd like to have an idea how much I'm up for
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Old 20 May 2006, 05:29 PM   #9 (permalink)
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most of the parts was sensors and i done the work my self
1 maf about 80 pound from subaru dealer
2 oxygen sensor 40 ish pound online will send you link if you need address
3 1.2mm part thats sit in boost pipe work. 3 pound subaru dealer
4 knock sensor from grade a subaru breakers about 30 pound
5 the rest is just service parts you could get in most places hope this helps
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Old 20 May 2006, 08:33 PM   #10 (permalink)
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Thanks, have to investing a Scooby workshop manual now

Can you put up the addy for the oxygen sensor please?

Ian
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Old 21 May 2006, 08:45 AM   #11 (permalink)
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hi m8 this is where my one came from no trouble yet and cheap with fast post hope this helps scott http://www.gendan.co.uk/oxygen_lambd...rs_Subaru.html
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