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07-20-2020, 04:42 PM | #1 |
Scooby Newbie
Member#: 105340
Join Date: Jan 2006
Chapter/Region:
BAIC
Vehicle:2006 WRX |
Shuddering at low speed after new engine install
I just installed a new short block in my wife’s 2010 Impreza outback sport due to a spun rod bearing. With the new engine, the car now shudders at low speeds when turning, especially when turning in and out of the driveway. The car rumbles pretty bad. It’s not the power steering pump. I also don’t think it is a transmission problem because it was not happening with the old engine. This was my 4th time pulling and installing an ej25, but I’m thinking I messed up on something.
Thinking back on the install, I’m wondering if I jacked up the transmission too much and somehow messed up the axles. The other thing I recall was that the torque converter was not aligned with the access hole on the engine block when I was bolting up the flex plate. I had to rotate the torque converter counter clockwise about 4 inches to the access hole. Is it possible I messed up the torque converter by rotating it? Would either of these things cause the drivetrain to shudder? I haven’t had a chance yet, but I am going to check for play in the front axles, and drain/fill the front diff and transmission fluid as an added measure. I appreciate any thoughts and help!
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Last edited by Faruchos; 07-20-2020 at 06:06 PM. |
07-23-2020, 05:50 PM | #2 |
Scooby Newbie
Member#: 348982
Join Date: Mar 2013
Chapter/Region:
NESIC
Location: Shoreham, VT
Vehicle:2002 TS Multi |
I normally when installing the motor the torque converter and flex plate should line up. Now with the car in park or N does the engine shutter when you step on the gas? or is it fine. This would help us further get to your issues as it could be engine related or trans related.
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08-06-2020, 11:36 PM | #3 |
Scooby Newbie
Member#: 105340
Join Date: Jan 2006
Chapter/Region:
BAIC
Vehicle:2006 WRX |
I changed the front and rear diff fluid and also did a drain/fill on the transmission fluid and the problem is still there. I also checked for play in the front axles and there wasn’t any.
The shuddering only happens when turning in drive and also reverse. It is very bad when going 1-5mph and gets less noticeable with increasing speeds when turning. There isn’t any shuddering while driving straight at any speed. The transmission shifts fine and doesn’t have any issues. As a test, I was turning slow to cause the shuddering. While turning, I shifted into neutral and the shuddering stopped. Any thoughts? |
08-08-2020, 07:43 AM | #4 | |
Scooby Newbie
Member#: 348982
Join Date: Mar 2013
Chapter/Region:
NESIC
Location: Shoreham, VT
Vehicle:2002 TS Multi |
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12-27-2020, 04:36 AM | #5 |
Scooby Newbie
Member#: 521239
Join Date: Dec 2020
Location: Washington
Vehicle:1999 Forester white |
You said you installed a new short block, does that mean you did the heads and timing yourself? Any CEL's?
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