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Old 08-04-2010, 10:32 PM   #1
Ti Pit
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2005 Baja Turbo

Default Idle Drop Problem 2005 Baja Turbo 5speed

Alright so I just fixed my check engine issue I was having earlier with the missfires, I replaced a coil pack and that problem is now resolved. Now I have a new problem that came up.

My car drives fine, accelerates normally and does not have any issues under load. When I come to a stop at a light, as soon as I release the gas pedal and hit the clutch my idle drops dangerously low and it takes a generous amount of time for it to go back up to it's normal idle speed. It doesn't always drop at the same level, sometimes its fine, sometimes it drops to maybe 500 and other times to the first line with is probably around 300rpm. Occasionally it will stall however it is rare and it always starts up after stalling.

I searched the Legacy/WRX/Forester forums and it pointed me towards the MAF or the IACV. After doing more research I found out that we do not have an IACV so it leaves only the MAF sensor.

I've checked and changed my air filter.
I've cleaned my MAF with MAF cleaner.
I've tried unhooking the MAF with the car running and the car stalled.

Does anyone know any other tests that I can do before purchasing a $270 Maf sensor or of any other part that could cause an idle problem? Iím taking the car on a 2000 mile road trip in a week and Iíd really like to have this issue resolved by then.

Thanks for your help, I really love my Baja and it's been really good to me so far, I gotta fix her up and make sure she runs like a champ again.
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Old 08-04-2010, 11:06 PM   #2
ascott13
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check for a vacuum leak somewhere after the maf, but before the intake manifold. The MAF measures the amount of air entering the engine, which means if there is a leak after it, the ecu is calculating for less air than it is actually getting. (this is why it stalled since it's main sensor kind of disappeared when you disconnected it...) if the leak is after the turbo you will get a lean condition at idle and low load, which could affect the idle, but when you are making boost the leak becomes a small boost leak and makes the turbo work harder, and you will run a bit richer, but not drastically so.

i would check all the stupid little hoses that connect to the intake tract...
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Old 08-22-2010, 06:20 PM   #3
Ti Pit
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A little update on this situation.

After about 3000miles of happy problem free driving the problem came back.

It seems to happen only when it is humid outside .. so when it rains or when I park in some underground parking garages.

The car has a hard time to stay running when I let go of the clutch, the idle is low or bad and the car does feel rough however when I'm driving it's fine. Missfire check engine is back on Cyl #2 and occasionally #4. Plugs are good, coil packs are brand spanking new. Is there anything else before the coil packs that activate the spark from the coil pack that might be going bad? Something is dying on me, I hope it's something easy to change out. The fact that it's not a constant problem is being a real pain in the ass.

EDIT: I forgot to mention that I could not find any vacume leaks or hear any either.
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Old 08-22-2010, 10:34 PM   #4
Baja_Gernaut
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Hey depending on your miles, have a compression check. My car had similar problem and it was valve. After my valve job, I installed a grimmspeed air oil separator and it supposed to help vent and avoid pre-detonation in the engine, the number one killer of subaru engines. I'll post pics one of these days.
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Old 08-23-2010, 09:57 AM   #5
Ti Pit
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I just turned 110,000mi. I'm really keeping that compression check for last as I'm really hoping that's not my problem. I've had the engine out and replaced in my WRX and that was a headach and I've had my engine out for headgaskets in my pain in the ass Outback... let's say it's the last thing I want to do on my Baja

I never got a flashing missifre though so I'm thinking it's a good sign.. the WRX would missfire so bad that the light would flash under boost. The baja seems to be different. I'm hoping for a fuel problem OR maybe a wire connection before the coil packs. Since cylinder 2-4 are the only ones affected I'm really wondering if theres something else controlling those 2 cylinders only that could be going wrong.

I was also thinking maybe the ECU could be having issues?

I need to find more tools for the fuel pressure and reading the ecu as my OBD2 reader only reads codes
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Old 08-23-2010, 11:17 AM   #6
moonzie
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If you ever disconnect your battery for an extended period of time it's going to reset your ECU.

When your ECU is reset it has to re-'learn' where it's most comfortable idle is. This usually takes a few stop and go trips through town. After about half a dozen trips it should know where the idle is.

Hope this helps!
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Old 08-23-2010, 11:37 AM   #7
BajaSTI04
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Also hit the brakes a few times to get all the charge out of the system.
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Old 08-23-2010, 01:39 PM   #8
Ti Pit
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I did this when I changed the coil packs about 3 weeks ago.

The first 200miles I had a lot of problems with the idle then it re-learned itself and was problem free for 3000mi. Now it started again so I'm not sure if doing it a second time would fix the actual problem or just push it back some more.
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Old 08-23-2010, 02:01 PM   #9
mtcs
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Alex Bastien de Prud'homme...
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Old 08-23-2010, 07:55 PM   #10
Baja_Gernaut
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Quote:
Originally Posted by Ti Pit View Post
I just turned 110,000mi. I'm really keeping that compression check for last as I'm really hoping that's not my problem. I've had the engine out and replaced in my WRX and that was a headach and I've had my engine out for headgaskets in my pain in the ass Outback... let's say it's the last thing I want to do on my Baja

I never got a flashing missifre though so I'm thinking it's a good sign.. the WRX would missfire so bad that the light would flash under boost. The baja seems to be different. I'm hoping for a fuel problem OR maybe a wire connection before the coil packs. Since cylinder 2-4 are the only ones affected I'm really wondering if theres something else controlling those 2 cylinders only that could be going wrong.

I was also thinking maybe the ECU could be having issues?

I need to find more tools for the fuel pressure and reading the ecu as my OBD2 reader only reads codes
If you take it to autozone they'll check it for free. But as you may know, the dealer has the right computer to give the right diagnosis. If it is really the hell out of you, pay for the diagnosis and fix it yourself and save sum baja bucks.
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Old 08-23-2010, 07:56 PM   #11
Baja_Gernaut
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Quote:
Originally Posted by mtcs View Post
Alex Bastien de Prud'homme...

REALLY?
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Old 08-28-2010, 11:19 PM   #12
MunkySpunk
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I had the same problem. Seafoam it, burn the crud out, change the oil - in that order.
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Old 08-29-2010, 03:29 AM   #13
steven765
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Quote:
Originally Posted by Baja_Gernaut View Post
If it is really the hell out of you, .
Grammatically that is the worst sentence I've ever seen written.

The only problem is the Subaru dealerships are staffed predominately by untrained monkeys. Not actual engineers who work on performance engines. They barely understand the functions of the Subaru Select Monitor. Anytime I've gone in with a problem I can't figure out, they can't either.
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Old 08-29-2010, 12:28 PM   #14
YBajaSteve
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Quote:
Originally Posted by steven765 View Post
Grammatically that is the worst sentence I've ever seen written.

The only problem is the Subaru dealerships are staffed predominately by untrained monkeys. Not actual engineers who work on performance engines. They barely understand the functions of the Subaru Select Monitor. Anytime I've gone in with a problem I can't figure out, they can't either.


"if it really is bugging the hell out of you" i bet.
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Old 08-29-2010, 05:15 PM   #15
bulwnkl
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Quote:
Originally Posted by YBajaSteve View Post
"if it really is bugging the hell out of you" i bet.
I'm sure that's it.

If one is to pick on grammar or spelling or similar issues, one should not then use "predominately" in the same post. The word is "predominantly."

Leaving that one one side, though, I have had the same experience at dealers as steven765 has. If I can't figure it out, neither can they.
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Old 08-29-2010, 11:18 PM   #16
Baja_Gernaut
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Quote:
Originally Posted by steven765 View Post
Grammatically that is the worst sentence I've ever seen written.

The only problem is the Subaru dealerships are staffed predominately by untrained monkeys. Not actual engineers who work on performance engines. They barely understand the functions of the Subaru Select Monitor. Anytime I've gone in with a problem I can't figure out, they can't either.
Are you serious? Isn't this a forum for car thought and ideas? If you want to go that route about grammatical mistakes, then you should take your "predominately" intelligence to another forum. I was only trying to give my 2 cents and here you go with your intellectual capacity. If you are really that bored, read a book where you will not find problems no. Gotz it.
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Old 08-31-2010, 12:07 PM   #17
Ti Pit
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Thanks for all the help guys, I broke down and brought it to a shop to have looked at. It took 8 hours of diagnostic to find the problem; this is costing me a lot more then I can afford just to find the damn problem

They checked the plugs, tested each coil pack, did a compression test, leak down test, smoked the engine to check for vacume leaks, checked for signs of a bad head gasket, ran numerous scans on the engine and then finally on their last attempt yesterday they decided to change the injectors around and boom the problem followed the injectors.

This morning they ran tests on the injectors and there is at least 1 seriously faulty injector, possibly a second but they didn’t get around to checking all of them yet. I ordered 4 rebuilt injectors and we are waiting for them to arrive.

What an expensive problem this was, I’m very disappointed that I didn’t find it myself. I know someone talked about injectors but the task was too big to do on my own in a parking lot.

Thanks for the help and support!

I just got the results from the shop by email.

Here is what my good injectors look like



and here is the miss in my bad injector


Last edited by Ti Pit; 08-31-2010 at 12:15 PM.
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Old 09-02-2010, 11:04 PM   #18
Baja_Gernaut
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Hey let us know when you install the injectors because I have never read about idle drops and bad injectors. This is interesting because my car runs rough once and awhile but then it can be that damn lag.
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Old 09-03-2010, 01:28 AM   #19
Ti Pit
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sure thing! The injectors haven't arrived yet, we are hoping to get them in some point next week as soon as we get them. I will update as soon as it's done.
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Old 09-24-2010, 12:04 PM   #20
Ti Pit
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a quick update on the situation.

It's been a week since the injectors were "rebuilt".

The Baja's been running great! No more check engine, no more ruff idle, the idle is normal and no longer drops or stalls. Sometimes I wonder if the car is even running when I'm stopped at a light, it's that smooth now I love it!

Thank God!
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Old 09-24-2010, 01:55 PM   #21
mtcs
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Glad to hear it...
Thank Selwyn House
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Old 09-24-2010, 02:52 PM   #22
honda killer
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Glad to hear the problem is finally resolved!
Did you use http://www.witchhunter.com/subarumod1.php4 ?

If not this is a good FYI to everyone, $50 per injector!

EDIT:
http://www.witchhunter.com/injectorserv1.php4
Prices start at $19 (basic service), $50 covers the service and high flow mod

Last edited by honda killer; 09-24-2010 at 03:13 PM.
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