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Old 02-27-2008, 02:54 PM   #1
HomeRun217
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Default Had a 'Hiccup' - advice?

Was wondering if someone has had this problem before or knows what it could be...

I'm just driving at a fairly normal speed, when all of a sudden, my car "hiccups". The revs drop almost 1,000rpm, and feels like my car has hit a wall. This hiccup is less than a second long, and then the car drives normal as if nothing has happened.

This has happened twice.

My theory is air/water in the fuel lines, because it has been very cold outside and there could be possible condensation in the gas tank.

Any ideas on what could have caused this, and how I could resolve this would be much appreciated!
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Old 02-27-2008, 02:57 PM   #2
Okeyd57
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Could it be your A/C compressor engaging ? If that's not it, I'm not sure what to tell you !
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Old 02-27-2008, 05:14 PM   #3
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nope, not the AC. Even if it were a faulty wire or something with the A/C...it wouldn't have been that sevre.

When this "hiccup" happens, its scary...feels like my car has thrown a road or something...not that i know what that would feel like, but i'm just saying its not the slight loss in power you get from turning the AC on.
Thanks though!
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Old 02-27-2008, 05:28 PM   #4
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Only felt something like once in someone's car with boost creep and that was under load... not driving along.
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Old 02-27-2008, 05:31 PM   #5
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Are you driving under steady boost at the time? Could be, with the cold weather, you run knock just at the edge of operation so it pulls a lot of timing for a little while.

Its not condensation in the gas line.

What mods do you have?
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Old 02-27-2008, 05:32 PM   #6
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My car does this when it's snowing. It feels like fuel cut, but I think it's an airflow problem. I have no idea what causes it.
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Old 02-27-2008, 05:46 PM   #7
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Could be a slight miss by one of the plugs...my car did this before, but threw a misfire code...

Patrick
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Old 02-27-2008, 05:49 PM   #8
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Quote:
Originally Posted by DiscoGsus View Post
Are you driving under steady boost at the time? Could be, with the cold weather, you run knock just at the edge of operation so it pulls a lot of timing for a little while.

Its not condensation in the gas line.

What mods do you have?
Utec - Stage 2 map
TurboXS Stealth back mated to the Prodrive Axle back
SPT Intake (please don't jump to conclusions and blame this as the source )

This happens under load. first time was moderate load, 2nd time i was flooring it in 2nd gear. It is random, so i cannot replicate it whenever i wish, otherwise i'd take a datalog. All my data logs look normal...just running a bit rich.
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Old 02-27-2008, 05:49 PM   #9
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Quote:
Originally Posted by nhmtns View Post
My car does this when it's snowing. It feels like fuel cut, but I think it's an airflow problem. I have no idea what causes it.
Mine acts up to in the snow, im glad to see someone else has the same problem I have been trying to figure out for the past few winters its really strange
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Old 02-27-2008, 05:50 PM   #10
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Quote:
Originally Posted by pweizman View Post
Could be a slight miss by one of the plugs...my car did this before, but threw a misfire code...

Patrick
my CEL has been on for a while, but its the pesky "evaporative emissions control leak (small)" code.

I was thinking it could be a plug misfiring...
Could changing them out for 1 step colder help?
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Old 02-27-2008, 09:46 PM   #11
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Quote:
Originally Posted by NRTmotorsports View Post
Mine acts up to in the snow, im glad to see someone else has the same problem I have been trying to figure out for the past few winters its really strange
Misery loves company.
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Old 02-28-2008, 12:22 PM   #12
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bump!

Does anyone else have a huge problem starting their Suby in cold (below freezing) weather?

It took me about 5 attempts to start my WRX this morning...just keeps cranking and cranking...
would this be a battery or starter issue?
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Old 03-01-2008, 09:21 AM   #13
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Quote:
Originally Posted by HomeRun217 View Post
bump!

Does anyone else have a huge problem starting their Suby in cold (below freezing) weather?

It took me about 5 attempts to start my WRX this morning...just keeps cranking and cranking...
would this be a battery or starter issue?
No...maybe your battery is going south.

Also, I have always heard you don't need to run colder plugs if you are on the stock td04 turbo.

It sounds like you could have a coil / ignition problem since you car has problems starting too.

Patrick
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Old 03-01-2008, 10:08 AM   #14
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My 06 wagon does this occasionally when I am driving slow 30mph or so and its snowing out. Usually I will be holding speed in 3rd gear, but under some load going up hill, and the car just bucks hard once and then is fine. Its probably happened 3 times in the last year. I've been meaning to post on here about it. Its never thrown a CEL.
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Old 03-01-2008, 10:34 AM   #15
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Quote:
Originally Posted by Gatorbait View Post
My 06 wagon does this occasionally when I am driving slow 30mph or so and its snowing out. Usually I will be holding speed in 3rd gear, but under some load going up hill, and the car just bucks hard once and then is fine. Its probably happened 3 times in the last year. I've been meaning to post on here about it. Its never thrown a CEL.
Yup, I have the same problem too. Never threw a code for it tho. It happens when im driving about 40mph, just regular driving. Car would just hiccup for a second and thats it. Im starting to think its my spark plugs, im at 48k and havent replaced them yet.
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Old 03-01-2008, 12:24 PM   #16
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^^ did you guys ever check for the code with a code reader. even though a cel never came on a code may still be stored.
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Old 03-01-2008, 04:29 PM   #17
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it sounds like an air problem to me. That is exactly what would happen if your throttle body suddenly closed or air flow suddenly stopped or decreased significantly. It isn't the cold because everyone is saying it happens when it is snowing, not just when it is cold. My assumption is that since snow is real light that it gets sucked to the cold air easier than rain. This could cause water to be getting in and likely consfusing the ecu at some point and closing the throttle on you or decreasing gas flow significantly. This is just a theory, maybe it is ridiculous but it has to be the snow, not the cold
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Old 03-01-2008, 06:35 PM   #18
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Not jumping to conclusions, but for lack of any other solutions perhaps try replacing the stock intake. You won't really lose any power and it might solve your problem.
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Old 03-02-2008, 09:48 PM   #19
HomeRun217
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Quote:
Originally Posted by whtlegacy View Post
Not jumping to conclusions, but for lack of any other solutions perhaps try replacing the stock intake. You won't really lose any power and it might solve your problem.
Understandable... but it's been happening to others who are using the stock intake.

It didn't happen when it was snowing... I think its the cold.
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Old 01-11-2011, 09:54 AM   #20
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Has anyone isolated this issue??

I have had my subie replicate this exact behavior at random, while under moderate load, and snowing. throws no visible cell..
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Old 01-12-2011, 04:50 PM   #21
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Quote:
Originally Posted by HomeRun217
bump!

Does anyone else have a huge problem starting their Suby in cold (below freezing) weather?

It took me about 5 attempts to start my WRX this morning...just keeps cranking and cranking...
would this be a battery or starter issue?
Nope neither... If it were the battery if you cranked more than 8-10 seconds it would be dead by then from all the amperage draw that the starter is putting on it and if it were a starter issue it probably wouldnt crank at all... You have other issues my friend
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Old 01-12-2011, 04:53 PM   #22
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Quote:
Originally Posted by pweizman

No...maybe your battery is going south.

Also, I have always heard you don't need to run colder plugs if you are on the stock td04 turbo.

It sounds like you could have a coil / ignition problem since you car has problems starting too.

Patrick
And no to the one step colder plugs... I dont think it makes a difference what turbo you are running they are more prone to foul sooner than the stock plugs... And wrong subforum...

Last edited by 2Fast4U1DAY; 01-12-2011 at 09:13 PM.
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Old 01-14-2011, 10:07 AM   #23
sublyme
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Quote:
Originally Posted by sublyme View Post
Has anyone isolated this issue??

I have had my subie replicate this exact behavior at random, while under moderate load, and snowing. throws no visible cell..

*bump for an answer*
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Old 01-16-2011, 09:46 PM   #24
'02 Subaru Rex
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I've had it happen a couple of times this winter as well. I have no idea what the cause of it is but it bugs the **** out of me.

Still looking for an answer.
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Old 01-16-2011, 09:55 PM   #25
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Did you try some dry gas, just in case it was from water in the tank. If you run the tank low condensation can build up.
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