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Old 05-13-2019, 11:00 PM   #1
etsola
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Member#: 484839
Join Date: Apr 2018
Default No power after head gasket change Legacy 2007

Hi there, if I hit the throttle just a bit like 1/8 th of the way, it seems to accelerate fine ... If I push it, it kind of bogs out ... as if it wasn't taking its gas ...

Was having misfiring issues prior to HG change, though they were full of coolant when I changed them and there was a coolant smell (on top of the leaks from underneath).

I don't have a check engine light, I did at some point because the misfiring did come back and I had the cyl #4 and cyl #3 misfire code.

Now no codes. I swapped the coil pack to test, but is the same.
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Old 05-15-2019, 08:49 AM   #2
Charlie-III
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Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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How old is the gas?
Have you rechecked the timing?
How many miles since the HG's were done?

Some codes take a few cycles to trip, also check for pending codes.
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Old 05-15-2019, 09:48 AM   #3
etsola
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I put 20$ yesterday, same

No I did not

Maybe 100km tops

Thanks
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Old 05-16-2019, 06:14 AM   #4
CaptainSlowbaru
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Member#: 445600
Join Date: Apr 2016
Chapter/Region: Tri-State
Location: Rafferty Subaru, PA
Vehicle:
2002 Outback Sport
Green

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Cylinders 3 and 4 are on opposite banks; some things that could cause that is a bad coil, a clogged exhaust...

Do you have access to a scan tool with live data? Id be curious what the fuel trims are... a bad vacuum leak, an EGR valve stuck open, or bad injectors could also cause a problem like yours.
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Old 05-16-2019, 08:41 AM   #5
etsola
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Join Date: Apr 2018
Default

I'm leaning to a clogged catalytic converter...
Is there a way to test for this? Or I just have to remove it and inspect it?

I do not have access to a scan tool.

The airbag light does come on sometimes... Then for another ride, it'll be off...
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Old 05-17-2019, 12:32 AM   #6
CosmoTheCat
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Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

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Airbag light is most likely caused by the overhead display. I've seen it a bunch.

Test for cat converter being clogged up? Let it cool and give it a whack with your hand, rubber mallet, something soft-ish. Can you hear anything bouncing around? If you have one, you can use a back pressure gauge. If not, take the bolts in front of it loose and shim it out so there's a decent gap, take it for a quick spin. It'll be loud, but it should breathe better. If it does, the cat is likely done for.
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Old 06-10-2019, 10:05 PM   #7
etsola
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Quote:
Originally Posted by CosmoTheCat View Post
Airbag light is most likely caused by the overhead display. I've seen it a bunch.

Test for cat converter being clogged up? Let it cool and give it a whack with your hand, rubber mallet, something soft-ish. Can you hear anything bouncing around? If you have one, you can use a back pressure gauge. If not, take the bolts in front of it loose and shim it out so there's a decent gap, take it for a quick spin. It'll be loud, but it should breathe better. If it does, the cat is likely done for.
Hey guys, thanks for the info... After all... It was a clogged cat on the mid pipe section!

I loosen the bolts out of the exhaust manifold to the mid pipe and went for a loud run... Was running fine!

In the end, a rodent made a nest in my mid pipe while the engine was out for the head gasket job!!!

I snake a coat hanger and kleenex like fluffs came out... God damn! I could've tried to change this and that for a while!!!

Thanks for the helpful advices!

Cheers
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Old 06-12-2019, 09:21 PM   #8
CosmoTheCat
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Is bigger than yours.

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Glad it's fixed!
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