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Old 10-19-2013, 11:53 AM   #26
04STIGUYdylan
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Default Misfire underload

Hey guys im a noob to the forums and looking for some advice where to start lookin for my problem. 2004 sti. Runs great at idle and if you ease into the gas pedal theres no misfire. If you step on it hard seem like around 11psi it starts to shudder sounds like its backfiring. ive ran injectir cleaner threw it and am goin to look at the plugs today. I unplugged the maf and started the car it did run smooth so would a cleaning of the maf help. Ive done no recent mods jist a timing belt 10000 km ago. Thanks Dylan
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Old 10-19-2013, 03:55 PM   #27
SlimJim8804
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Could be ignition related. Check your spark plugs and more specifically gap them correctly.
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Old 10-19-2013, 04:14 PM   #28
04STIGUYdylan
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Okay im going to try that tonight. Do you know what gap the plugs should be at? I also have a new fuel filter on the way.
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Old 10-22-2013, 12:14 PM   #29
White-o
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I should have my car back tomorrow. First off, no one mentioned that a compression test alone is $500 dollars .___.
But guess what. I still haven't had one done.
The mechanic said my k&n panel filters oil was covering the maf. He cleaned it and it got better, unplugged it and it stopped misfiring altogether.
They ordered a new maf and they're gonna put a normal filter in.
I was mad, this was one of the super easy possible solutions, but I never actually checked to see for myself!

We will see if this solution is for good or not.
Anyway thanks, and I'll see y'all next time lol
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Old 10-22-2013, 12:40 PM   #30
Blackfin
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Quote:
Originally Posted by White-o View Post
I should have my car back tomorrow. First off, no one mentioned that a compression test alone is $500 dollars .___.
Say what?

Most shops are charging ~$100/hr: You're telling me your shop takes 5 hours to do a compression test?

Find another shop. Or better yet, do it yourself:

$30 for a tester. You likely already have a socket wrench and a plug socket and if not you can find a set for cheap. Then it's just a matter of pulling the plugs, screwing in the tester to each cylinder, opening the throttle and cranking it for a few full cycles.

Learn to do this stuff yourself and save a bundle over time.

Quote:
But guess what. I still haven't had one done.
The mechanic said my k&n panel filters oil was covering the maf. He cleaned it and it got better, unplugged it and it stopped misfiring altogether.
Use a dry filter or stop putting so much oil on the K&N. A MAF fouled with this stuff lies to the PCM about how much air is actually entering the engine which can lead to leaning out and detonation.
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Old 10-22-2013, 12:48 PM   #31
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Quote:
Originally Posted by White-o View Post
First off, no one mentioned that a compression test alone is $500 dollars .___.
Well then stop paying a highschool dropout $100/hr to screw a spark plug adapter into a hole and turn a key. Learn how to do it yourself instead and you'll spend less money and acquire tools out the wazoo.
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Old 10-22-2013, 03:10 PM   #32
ride5000
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$500?

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Old 10-22-2013, 03:46 PM   #33
Mr Wrex
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Quote:
Originally Posted by White-o View Post
...a compression test alone is $500 dollars .___.


Next time, give me the $500. I'll give you a compression test, take you out for a nice seafood dinner, and if you're lucky... I just might call you again someday.
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Old 10-22-2013, 04:00 PM   #34
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Quote:
Originally Posted by Blackfin View Post

Say what?

Most shops are charging ~$100/hr: You're telling me your shop takes 5 hours to do a compression test?

Find another shop. Or better yet, do it yourself:

$30 for a tester. You likely already have a socket wrench and a plug socket and if not you can find a set for cheap. Then it's just a matter of pulling the plugs, screwing in the tester to each cylinder, opening the throttle and cranking it for a few full cycles.

Learn to do this stuff yourself and save a bundle over time.

Use a dry filter or stop putting so much oil on the K&N. A MAF fouled with this stuff lies to the PCM about how much air is actually entering the engine which can lead to leaning out and detonation.
Yeah I thought that was an outrageous price. And yeah, I'm trying to learn as I go but at the same time I can't afford to try to fix something and break the car worse. So baby steps.

And yeah, the filter was on there when I got the car. I thought the k&ns were dry but I was wrong. Anyway thanks
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Old 10-24-2013, 01:25 AM   #35
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So they called me and said that after replacing the maf they noticed that the misfire wasn't actually completely gone. They said that they suspect that the air fuel sensor needs to be replaced. They said there's one in the front and one in the back, they'd be replacing the one in the front.
I haven't really ever heard of an air fuel sensor.
Does this sound feasible?

They told me that in my case, it's hard to pin the problem down since there are so many things that can cause this, which I have heard from many others on here.

I'm pretty certain I'm getting ripped off because the car is at the dealership, but I need the car soon and I can't find anyone else I would trust to work on it.

If anyone knows a good subaru mechanic in the Jacksonville area, that'd be super helpful for future notice.
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Old 10-24-2013, 02:27 AM   #36
Trae32566
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Quote:
Originally Posted by White-o View Post
I should have my car back tomorrow. First off, no one mentioned that a compression test alone is $500 dollars .___.
Damn, I hope they at least take you out to dinner and offer a happy ending.

Also, can you try another dealership?
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Old 10-24-2013, 06:21 PM   #37
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Originally Posted by Trae32566 View Post

Damn, I hope they at least take you out to dinner and offer a happy ending.

Also, can you try another dealership?
Well there's one in Jacksonville but they were dicks to me on the phone lol.


Anyway they gave me a compression test for free since what they did wasn't working.
Guess what?! You all were correct.
30% leakage on cylinder 4.

They could repair it but there were so many ifs and maybes that I decided to just get a whole new engine.

Hopefully the replacement engine isn't misfiring >___>

And also hopefully I won't be back here looking for answers for a long time. Thanks to all that tried to help me along the way.
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Old 10-24-2013, 08:05 PM   #38
the suicidal eggroll
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Quote:
Originally Posted by White-o View Post
Anyway they gave me a compression test for free since what they did wasn't working.
Guess what?! You all were correct.
30% leakage on cylinder 4.
30% leakage? That's not a compression test, that's a leakdown test. In that case, the $500 is a bit more reasonable
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Old 10-24-2013, 10:23 PM   #39
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this thread feels just like falling down the stairs...in a high rise.
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Old 10-24-2013, 10:30 PM   #40
kabz
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We should send him some KY.

Aww, sorry to hear about the bad ringland. That really sucks.
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Old 10-25-2013, 02:42 AM   #41
White-o
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Quote:
Originally Posted by the suicidal eggroll View Post
30% leakage? That's not a compression test, that's a leakdown test. In that case, the $500 is a bit more reasonable

Oh right, my bad.
The guy dumped so much info on me, I got a bit confused lol.
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Old 10-26-2013, 09:37 PM   #42
White-o
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Quote:
Originally Posted by White-o View Post

Oh right, my bad.
The guy dumped so much info on me, I got a bit confused lol.
By the way, what exactly is a leak down test? I know what it determines, but not how its actually done
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Old 10-26-2013, 10:29 PM   #43
the suicidal eggroll
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Bring the piston to TDC, pressurize through the spark plug hole, and measure how much of the pressurized air escapes (and where it escapes).

http://en.wikipedia.org/wiki/Leak-down_tester

The "where" is one of the critical parts of the test, since it tells you where the failure is. 30% leak is bad, but knowing if that 30% leak is going into the header, or the intake manifold, or the crankcase, tells you exactly where the problem in that cylinder is.
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Old 11-07-2013, 05:42 PM   #44
White-o
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So I vow that I will never take my car the dealership again.
They have had my car for 3 weeks to install a new shortblock.
They told me on the phone that it would cost 4k before they started.
No other prices were mentioned.
Today I get a call and the guy says everything is done and the total is $7,996.

Is this what everyone else expects from the dealership, or is mine just absolutely f*cking insane?

Theres no way I'm paying this. Even if I wanted to, I can't afford it. That's over half what I paid for the car.
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Old 11-07-2013, 05:53 PM   #45
Razgeiz
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Quote:
Originally Posted by White-o View Post
So I vow that I will never take my car the dealership again.
They have had my car for 3 weeks to install a new shortblock.
They told me on the phone that it would cost 4k before they started.
No other prices were mentioned.
Today I get a call and the guy says everything is done and the total is $7,996.

Is this what everyone else expects from the dealership, or is mine just absolutely f*cking insane?

Theres no way I'm paying this. Even if I wanted to, I can't afford it. That's over half what I paid for the car.
At that price man you could of went to RSD and got a factory subi block and had a shop bolt on all your other usable stuff. To the tune of about 4.5k depending on labor...
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Old 11-07-2013, 06:16 PM   #46
atomicfire
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Quote:
Originally Posted by White-o View Post
So I vow that I will never take my car the dealership again.
They have had my car for 3 weeks to install a new shortblock.
They told me on the phone that it would cost 4k before they started.
No other prices were mentioned.
Today I get a call and the guy says everything is done and the total is $7,996.

Is this what everyone else expects from the dealership, or is mine just absolutely f*cking insane?

Theres no way I'm paying this. Even if I wanted to, I can't afford it. That's over half what I paid for the car.
Wow you are terrible at this. Sell the car, go get a Honda Fit or a Toyota Yaris or something with a warranty.
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Old 11-07-2013, 06:43 PM   #47
White-o
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Originally Posted by atomicfire View Post
Wow you are terrible at this. Sell the car, go get a Honda Fit or a Toyota Yaris or something with a warranty.
Thanks for your highly irrelevant opinion.
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Old 11-07-2013, 06:46 PM   #48
White-o
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Quote:
Originally Posted by Razgeiz View Post
At that price man you could of went to RSD and got a factory subi block and had a shop bolt on all your other usable stuff. To the tune of about 4.5k depending on labor...
I know man, its insane that they think they can get away with this.
I went off on them and they said that didn't have to be the final price and one of their guys will call me back.
Ugh.
Damn right its not the final price .___.
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Old 11-08-2013, 08:07 AM   #49
ride5000
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wait.

did you or didn't you authorize the work?
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Old 11-08-2013, 05:46 PM   #50
Razgeiz
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Unfortunately I think he said go for it on the work without understanding or being told the price could go up depending on what they found
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