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Old 11-22-2012, 10:57 PM   #1
RhastaWRX
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Default 2004 WRX first mod question

Whats up guys. I am very new to mods and turbos in general and just had a few questions. I recently got a awesome 2004 WRX 2.0 from a dealership. It has a pristine body and relatively few mods which was a huge draw! I assumed the previous owner babied the thing or was my dads age The only mod that was on it was a SPC intake and a exhaust. In my uneducated state I thought this was a "no big deal" but in the past 10 months of ownership I have just seen some absurd engine behavior.

* Random cylinder misfires (cylinder 3,4) Typically happen either in very cold weather or in the first summer humid rain.
*A IACV that keeps getting very dirty over 2 or so months..
*Front o2 sensor died
*dirty MAF sesnor

Last weekend I started it up again on a cold morning and I was left stranded in my driveway with a flashing CEL...

From my research, the LAST thing he should have done is installed a SPC intake especially as a first mod! Correct me if im wrong.

The power of this thing is just not what I would think it should be so is it safe to say I should put the stock air filter back in or just get it tuned?

Any help would be appreciated
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Old 11-22-2012, 11:19 PM   #2
i_c_the_light
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Quote:
Originally Posted by RhastaWRX
Whats up guys. I am very new to mods and turbos in general and just had a few questions. I recently got a awesome 2004 WRX 2.0 from a dealership. It has a pristine body and relatively few mods which was a huge draw! I assumed the previous owner babied the thing or was my dads age The only mod that was on it was a SPC intake and a exhaust. In my uneducated state I thought this was a "no big deal" but in the past 10 months of ownership I have just seen some absurd engine behavior.

* Random cylinder misfires (cylinder 3,4) Typically happen either in very cold weather or in the first summer humid rain.
*A IACV that keeps getting very dirty over 2 or so months..
*Front o2 sensor died
*dirty MAF sesnor

Last weekend I started it up again on a cold morning and I was left stranded in my driveway with a flashing CEL...

From my research, the LAST thing he should have done is installed a SPC intake especially as a first mod! Correct me if im wrong.

The power of this thing is just not what I would think it should be so is it safe to say I should put the stock air filter back in or just get it tuned?

Any help would be appreciated
If you're new to turbocharged cars then how can you assume the power isn't what it should be?
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Old 11-22-2012, 11:35 PM   #3
RhastaWRX
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Well it just seems to not be as responsive when I lay on the gas as I would think it should be. Almost as if its bogged down until I get up to 3k rpm (I mean its a WRX, i should'nt have people in acuras beating me at the line...). The only other turbo's ive driven were the 2.5 and there is a obvious difference there.
I just want to ensure I am not causing the engine any damage by having a CAI installed without a tune. Or any other mechanical factor that I am missing.

Last edited by RhastaWRX; 11-23-2012 at 12:53 PM.
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Old 11-22-2012, 11:36 PM   #4
RhastaWRX
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"shouldnt"
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Old 11-22-2012, 11:51 PM   #5
turbolvrwrx
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A flashing CEL indicates a misfire and you should avoid driving the car if possible until the problem is fixed. You mentioned that you have had misfire issues before... did you do anything to address the problem? Have you performed a compression test?
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Old 11-22-2012, 11:59 PM   #6
saar
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Quote:
Originally Posted by RhastaWRX View Post
Well it just seems to not be as responsive when I lay on the gas as I would think it should be. Almost as if its bogged down until I get up to 3k rpm (I mean its a WRX, i should have people in acuras beating me at the line...). The only other turbo's ive driven were the 2.5 and there is a obvious difference there.
I just want to ensure I am not causing the engine any damage by having a CAI installed without a tune. Or any other mechanical factor that I am missing.
Sounds like a normal turbocharged car.
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Old 11-23-2012, 12:16 AM   #7
RhastaWRX
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Yes when this first happened 2 months after I bought it I ended up replacing all the spark plugs and one coil pack and the issue resolved. 3 months later I had a similar issue that left me stranded on my way to work on a rainy spring morning however there was no misfire code thrown, I simply could not pull out of the parking lot. That time I cleaned out the MAF and IAC valve 8 hrs later and I was able to drive it as normal.

2 months ago I got a code about the front o2 sensor so I replaced the upstream o2 sensor and the code went away.

Last week is when I got the cylinder 3 misfire that left the car un-driveable again.

So I am just wondering if all my issues could be related to this SPC intake that came with the car and if so what I can do to save myself from being stranded so often
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Old 11-23-2012, 12:24 AM   #8
RhastaWRX
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I didnt have time this week to dig into my car so I took it to a shop and this time they replaced the #3 spark plug, threw in a working coil pack to replace the faulty one (stock oem) and the car is back to working as normal. No compression tests have been done
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Old 11-23-2012, 12:59 AM   #9
drewvdw
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MPS powered.

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SPC or SPT? The SPT one should be fine as it is a dealer installed option. You may want to make sure that all the connections are sealed and such, that could lead to dirty MAF, dirty IAC valve, and cause it to run lean.

This really belongs in the newbie section...
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Old 11-23-2012, 04:18 AM   #10
schaffer
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Quote:
Originally Posted by saar View Post
Sounds like a normal turbocharged car.
Especially since the 2.0 wrx's start to spool around 3000
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Old 11-23-2012, 08:49 AM   #11
nmlittlebigman
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You may have an aftermarket flywheel or other mods unseen. It's possible that the previous owner was running another tune on that car with an AP and flashed it back to stock when he sold it. Here's a thread on possible causes of misfires:
http://forums.nasioc.com/forums/show...hlight=misfire
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Old 11-23-2012, 08:59 AM   #12
sackytar
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Before you even think about getting tuned I would make sure your car is healthy.

First deal with the CEL. It's your front O2 is done your gas mileage is going to be bad.

Check the coil packs and spark plugs or really change them just because.

I have a front o2 sensor if you need one.
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Old 11-23-2012, 09:00 AM   #13
sackytar
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Wait so the shop you took it to only change one Spark Plug?
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Old 11-23-2012, 09:36 AM   #14
561wrx
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So it was a rainy day when the misfire happened right? So moister got past the seals around the coil pack and caused a misfire. I have seen that happen before. The coil pack would look good, but in actuality the plastic rubber is not sitting right and moister was getting past the coil. If I was u I would replace then all and make sure the wiring is in good condition, and I'm guessing they swapped coil packs around. An find out what temp range is those spark plugs, because that make difference. An what gas r using?
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Old 11-23-2012, 10:50 AM   #15
SubieLuvin
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Wrx's... Especially the 2.0 make very very little power under 3k, that part is normal. If I were you I'd just do a little tune up and get it all out of the way. Do the plugs and packs all at once, clean the maf with appropriate cleaner, check all the seals on the intake and couplers to make sure there are no leaks, check for vacuum leaks and replace any ****ty lookin lines, and definitely take care of the 02 sensor. Oem plugs are the way to go for where you are at right now as well.
Spend some time reading unabombers manifesto. Also look around in the newbie stickies. There is a tonnnn of good info on this site.

post pics of your bay if you have the time and we will be able to tell a little if someone poked around in the bay a bit more than advertised.
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Old 11-23-2012, 11:20 AM   #16
RhastaWRX
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Platinum Silver

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Quote:
Originally Posted by drewvdw View Post
SPC or SPT? The SPT one should be fine as it is a dealer installed option.
Thanks for all the info guys I really appreciate it. I have been reading these threads like crazy over the past week.

Sorry, it is a SPT CAI but I dont know if it was the dealer installed option. I will post pics today of my bay so you can see exactly what I mean. Also, here is the work that I have done on it over the past year but continue to have issues with misfires and such just to be clear:

-Replaced all spark plugs with oem (but not coils) Done 20k miles back or so
-Timing belt done at 104k
-Front o2 sensor replaced
-Cylinder 3 coil pack failed and it also ruined the plug. Shop replaced both the plug and the coil pack. Check engine light is gone and has not come back

I have a feeling I should just replace all my other coil packs and the plugs as well since I will be working in the area.
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Old 11-23-2012, 11:44 AM   #17
SubieLuvin
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If its an spt it should be a short ram intake don't think spt ever made a CAI? Could be wrong though
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