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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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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Pontiac grand prix 2007 car shutting off, with Start disabled throttle control module.

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My 1998 Engine EJ20J hasitates, can ECU be reprogrammed or do i have to change it to higher version?

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.
At least i bougt on E-Bay a new ECU ,an 22611AD311 in stead of the AD310,
The AD311 has an software update and now the engine runs smoother and the hasitation is practically gone.
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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