|
|
|
|
Thread Tools | Display Modes |
04-19-2023, 03:08 AM | #1 |
Scooby Newbie
Member#: 533954
Join Date: Apr 2023
|
JDM EJ20Y Help
I have a 2007 JDM Subaru Legacy GT Spec.B 6MT with the twin scroll ej20y, and I have been having an issue with the car bucking/jerking violently under acceleration. It is worse when it is cold, but improves once warm. It occurs under both part and full throttle randomly. Sometimes it happens at 3k, other times at 5k, sometimes not at all. Once it starts bucking, it wont stop until you get off the gas. The car will also start bucking if you shift/start off rough, and wont stop until you get off the gas. The car is also making less boost than normal, capping at 10psi, however I cannot find any boost leaks. I have already replaced the spark plugs, but that did not improve anything. I am at a lost on what to do.
* Registered users of the site do not see these ads.
|
04-19-2023, 07:54 AM | #2 |
Scooby Newbie
Member#: 531671
Join Date: Oct 2022
Location: Ontario
Vehicle:2010 WRX Hatchback White |
When the bucking doesn't happen, are you still making less boost than usual? If so, then my guess would be that there is a boost leak somewhere, or something is wrong with the turbo or some other part of the forced induction system. Having a shop (or yourself) conduct a smoke test is a good way to check for leaks if you haven't done so already.
When you replaced the spark plugs, did you check the coil packs? Apparently they start to separate when they get older, or can sometimes just go bad overtime, both of which can lead to misfires, which could also be what you are experiencing. Last thing I can think of is to go over your electrical system. Make sure battery cables are securely connected to terminals, that any other wires are still in decent shape and not corroded, and that all grounds in general are good as well. Mostly just spitballing based on what I've read on here and elsewhere from when I was researching how to deal with a somewhat similar issue with my ej20x (which for the time being has appeared to resolve itself), so hopefully someone else more experienced can chime in. Regardless, hope you're able to get to the bottom of it! |
04-19-2023, 07:54 AM | #3 |
Scooby Newbie
Member#: 531671
Join Date: Oct 2022
Location: Ontario
Vehicle:2010 WRX Hatchback White |
When the bucking doesn't happen, are you still making less boost than usual? If so, then my guess would be that there is a boost leak somewhere, or something is wrong with the turbo or some other part of the forced induction system. Having a shop (or yourself) conduct a smoke test is a good way to check for leaks if you haven't done so already.
When you replaced the spark plugs, did you check the coil packs? Apparently they start to separate when they get older, or can sometimes just go bad overtime, both of which can lead to misfires, which could also be what you are experiencing. Last thing I can think of is to go over your electrical system. Make sure battery cables are securely connected to terminals, that any other wires are still in decent shape and not corroded, and that all grounds in general are good as well. Mostly just spitballing based on what I've read on here and elsewhere from when I was researching how to deal with a somewhat similar issue with my ej20x (which for the time being has appeared to resolve itself), so hopefully someone else more experienced can chime in. Regardless, hope you're able to get to the bottom of it! |
Thread Tools | |
Display Modes | |
|
|