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Old 04-17-2021, 05:08 PM   #1
huskygsd
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Member#: 329324
Join Date: Aug 2012
Default Strong deceleration/engine brake when letting off gas

I have an 06 WRX stock that had a bit of work done on it recently:
-changed air filter
-cleaned MAF
-installed Mishimoto IC hoses
-cleaned throttle body
-replaced PCV valve
-replaced/flushed slave/master cylinder and line
-two new tires that were ~13,000 miles difference from the old placed on FRONT axle (non-dealer shop said this is best)

I know that in 1st and 2nd the throttle is extremely sensitive and there is going to be bucking, but recently even in 5th on the highway, if I let off the accelerator, there will be a 1 second delay and then the car pulls back and starts decreasing like 10mph in 5 seconds on a flat surface.

It's slight but my dog especially notices it and hates riding in the car now. I checked everywhere for leaks - didn't do a leak test - but am starting to think it has something to do with the tires and their circumference? Dealer is a bit stumped...
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Old 04-17-2021, 05:54 PM   #2
Diavolo_
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off throttle if your speed decreases 10mph in 5 seconds that doesnt sound unusual.
what do you mean "there is going to be bucking"? under what conditions?
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Old 04-17-2021, 10:48 PM   #3
huskygsd
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Quote:
Originally Posted by Diavolo_ View Post
off throttle if your speed decreases 10mph in 5 seconds that doesnt sound unusual.
what do you mean "there is going to be bucking"? under what conditions?
It just doesn't coast anymore. Going down a decline on the highway, the speed stays the same or decreases.

By bucking, I mean the usual engine brake when coming to a stop in the lower gears.
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Old 04-18-2021, 02:58 PM   #4
AliBenn
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Join Date: Nov 1999
Chapter/Region: TXIC
Location: Houston TX
Vehicle:
1998 /2005 STunIcorn
Acadia Green USDM 22b

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Stuck brake caliper?
Never heard of 2 sides failing at same time thou
Parking brake stuck on?
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Old 04-18-2021, 11:47 PM   #5
huskygsd
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I wish it were that easy. It coasts just fine when I take it out of gear into neutral.
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Old 04-19-2021, 08:05 AM   #6
akritzer
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2013 WRX Hatch

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Depending on the tire and how you drive 13k miles can be a fair bit of wear. I'd be trying to get all four done at the same time always. Quick Google search says you want them within 2/32 of each other.

I don't know if it's going to help your issue, but you likely are making the center diff work harder than it needs to if your tire heights aren't matched.
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Old 04-19-2021, 08:44 AM   #7
Jefe159
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Chapter/Region: MWSOC
Location: The Nasty Nati
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11 STI
sparkly fun gray

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I tend to agree that what you are describing is normal engine braking. The only thing that seems kind of odd is the 1-second delay you're talking about.

Like someone else said, even in 5th, 10mph deceleration in 5 seconds seems normal. What makes you think that just because you're in a high gear that means the car won't engine brake? Yes, low gears are jerky-er when going on/off the throttle, but when in a high gear the drivetrain is still being retarded by the engine when at 0% throttle, even if it is less noticeable. Of course the car will coast in neutral because there is nothing holding it back from doing so.

Perhaps a video of it happening would clear things up?

Just my $.02
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