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New Member from Hersham (In Need of Assistance)


sweeney
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A bit about me


 


Owned a 98 Subaru Impreza turbo for the last 14 years and still currently it got in the garage  :D. Just got my hands on a 02 forester sport love that boxer sound they make but got problem with it  :(


 


I got a misfire on cylinder 4 and a shaky engine when it is idle, any help with resolving these issues?


 


Thanks alot  :D


 


Sweeney from Surrey


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Hi mate welcome to S.O.C 

A cylinder misfire can be caused by lack of spark, lack of compression or imbalance in the air/fuel mixture. Lack of spark can be caused by worn or damaged spark plugs or Coil pack, lack of compression by a blown head gasket and imbalance in the air/fuel mixture by a faulty fuel injector, fuel pump or pressure regulator. It can ultimately be a number of things so further diagnosis would be necessary to find the cause, and assess the damage and repair cost. 

I would start with the cheaper options 1st I don't think it would be a head gasket I'm sure you would know yourself if that had gone. So would start with the spark plugs then work back to the coil pack. 

And have you cleared the codes for it to return before you start ripping it to bits :D Yes I speak from  experience on that part ;) 

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If you're not confident to take it on yourself I would give one of the Subaru specialists in surrey a call, Surrey Subaru Specalists or TFS racing If have used both of them myself and would recommend them. Dan at Surrey Subaru specialist is also able to provide a mobile service. Both also come highly recomended by the Surrey Scoobies Club, they do work for an awful lot of members.

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Thanks for your feed back,

Subaru went in to the garage this morning and i forgot to mention that sometimes when the car is at a standstill the engine light flashes. They changed the spark plugs and put a new distributor and leads on as well as did a compression test which was fine. They cleaned the injectors but the engine still rocks and the engine light still flashes sometimes. When it is running however it runs fine and the engine light no longer flashes. 

 

Any more suggestions would be a big help, thanks

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Yeah, defo clean the MAF. Even though it may look clean, it's probably not.its worth doing regardless and will only cost you the price of a can of "isopropyl alcohol".how old is the air filter? Also what rpm does it tick over at at normal running temprature

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Hi and welcome.

With the engine running at idle, unplug the MAF. If the MAF has had it, the engine will run on without issue. If the MAF is a good one, the engine will falter and maybe even stall.

However, if the running issues are fine but the engine rocks from side to side, it's probably got a broken engine mount.

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Hi thanks for help  when its hot it runs at 750rpm steady when it idling,in traffic it goes down to 500 rpm up to little over 1000 rpm.when pulling away it dips a little then its fine on the run,its never stalls but nearly has,when i say the engine shakes it  makes the hole car rocks.

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I think it will be the MAF by the sounds of it. I'd do what Tlag said see change it if it need's doing and see how it goes after that  just remember to reset the ECU if you change it. If you need hand with that we have a guide some where can dig out showing you how to do that with little to no tools needed :D 

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You're more than welcome 

I forgot you was on about a forester. Haha the profile picture I'm blaming that ;) 

I think the MAFS is apart of the airbox or a part of the pipe that comes off it. I don't have a picture of the engine on a 2002 but I do have a workshop manual if that would be of any help :D 

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  • 4 weeks later...

forester went to surrey subaru specialists bad news valve guides worn it seams to be a common problem with naturally aspirated subaru engines not so with the turbo models because cylinder 4 is the last to get oil to it will let you know what happens when its been fixed by sss   best to keep changing the oil unlike the last owner ones a year 10,000 miles  :angry:

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We have a few of you from that way on here and all rate SSS and be nice to have them on the list. They don't need to be active every day or anything but get there own post like what I did for Sheffield Subaru Services and get a catalogue of recommended garages here :) 

Thats my bigger picture anyway :D 

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