New Subaru Fan Posted January 8, 2010 Share Posted January 8, 2010 Hi Guys, When I try to push the gas pedal to the maximum while accelerating the car starts to jerk. In the beginning we thought it could be because of the older turbo design but the guy I met a couple of days ago told me his Legacy GT (same as mine) accelerated smoothly and he even didn't know what I was talking about.So far I didn't have much time to investigate this problem. I'm sort of collecting info on this. I've just added some injector cleaner in assumption that this problem originates from the fuel lines.I really want to address this issue as I don't want to ruin the engine after we replaced HGs etc. Has anybody ever had this sort of problems or has anyone an idea? Cheers Link to comment Share on other sites More sharing options...
Baddog Posted January 9, 2010 Share Posted January 9, 2010 How about the plugs/wires? Link to comment Share on other sites More sharing options...
ehsnils Posted January 9, 2010 Share Posted January 9, 2010 Check the fuel pressure too - your fuel pump may start to get old and not being able to keep up. And a new fuel filter may help too! Link to comment Share on other sites More sharing options...
New Subaru Fan Posted January 10, 2010 Author Share Posted January 10, 2010 How about the plugs/wires? Don't know when they were changed last time. The previous owner doesn't know either. Is there any way to check it? Or maybe just replace? Cheers Link to comment Share on other sites More sharing options...
New Subaru Fan Posted January 10, 2010 Author Share Posted January 10, 2010 Check the fuel pressure too - your fuel pump may start to get old and not being able to keep up. And a new fuel filter may help too! Thanks, I'll do. I've just realized that the car jerks more if cold. What could this be an indication for? Link to comment Share on other sites More sharing options...
ehsnils Posted January 10, 2010 Share Posted January 10, 2010 More fuel is usually needed during cold weather, so that can also indicate that the fuel pump is weakening. So checking the fuel pressure both when idle and under full load will get a good indication. Also - check out vacuum hoses. There may be a manifold pressure sensor connected via a vacuum hose and if the hose leaks the sensor will get wrong reading and you will get the wrong mixture. A general check/replacement of rubber hoses may be good. As for plugs/wires - just replace the plugs with new ones, that's no big deal. Clean the wires and ignition coils. Don't use a lubricating agent like WD40, rather pure ethanol or similar that isn't too aggressive and evaporates. The cables and coils shall be clean and dry. The lubrication that exists in WD40 will attract dirt big time. Of course - you can also replace the wires, they aren't that expensive. Old rubber wires may be cracked. The spark plugs/wires can of course also cause the car to jerk if they are bad. Link to comment Share on other sites More sharing options...
New Subaru Fan Posted January 10, 2010 Author Share Posted January 10, 2010 More fuel is usually needed during cold weather, so that can also indicate that the fuel pump is weakening. So checking the fuel pressure both when idle and under full load will get a good indication. Also - check out vacuum hoses. There may be a manifold pressure sensor connected via a vacuum hose and if the hose leaks the sensor will get wrong reading and you will get the wrong mixture. A general check/replacement of rubber hoses may be good. As for plugs/wires - just replace the plugs with new ones, that's no big deal. Clean the wires and ignition coils. Don't use a lubricating agent like WD40, rather pure ethanol or similar that isn't too aggressive and evaporates. The cables and coils shall be clean and dry. The lubrication that exists in WD40 will attract dirt big time. Of course - you can also replace the wires, they aren't that expensive. Old rubber wires may be cracked. The spark plugs/wires can of course also cause the car to jerk if they are bad. Thanks, man! Link to comment Share on other sites More sharing options...
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