Question about 1998 Subaru Forester

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1998 Engine EJ20J hasitates during easy

1998 Engine EJ20J hasitates during easy acceleration,not with full throttle.

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  • arnold_helee Jul 27, 2009

    Thanks for your reaction,the knocksensor i shut out once ,but no result,and the trhottlepositionsensor should give in mijn opinion a faultcode,but there is no faultcode,whe already read out and reset the ecu with the SSM,
    what whe noticed was that de ignitiontiming run from 20 degrees erly to 3 degrees after ignition during acceleration(not full trottle).

    I already replaceced the spark plugs(ngk),spark plug wires(nipparts),the ignition coil(original),the crankshaftsensor,tried 98 ron petrol,new airfilter and fuelfilter but the hasitation stays on.
    I'm have my doubts about the ECU (22611AD310)
    but a new one is very expensive,so i want to try one before buying .

    Do you have some options open for me?

    Already thanks

  • arnold_helee Jul 29, 2009

    Doesnt give an TPS error no faultcode?
    Its difficult to send it up,because ican't use the car then for a while and that is no option for me.
    I need the car a few times a week.

  • arnold_helee Aug 26, 2009

    I solved my hasitating problem,i changed the ECU and mounted an newer type,the 22611AD311 in stead of AD310
    This ECU seems to have a better softwere inside.The engine is running better and it looks that he has lower revs at the same speed(I know it sounds silly,but its trough)
    So this problem is solved!!

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  • 382 Answers

The first 2 things to check are the Knock sensor, If it happens between 2000 and 2500, and the Throttle position sensor. Good luck and have a great day.

Posted on Jul 19, 2009

  • Mike Gagnon
    Mike Gagnon Jul 29, 2009

    Did you test the TPS? I would still suspect that before the ECU. IF you can I would check the TPS with a meter.

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Hello,I had the same problem with my 1998 2.0 Forester,I tried a lot options:
(other spark plugs,new sparkplugcables,other ignition coil,replacing the knocksensor,another camshaft sensor,reset the ECU on a Subaru select monitor,"it doesn work with an universal scantool" using ron98 petrol instead of ron95),but no satisfiing result.
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But you can trie a reset first,you can also do it yourself,
Disconnect the both batteryclams set the ignitionswiths on with the key and push the brake for 5 seconds.Then connect the battery and try.
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