06 LGT P0302 low/high idle rpm. Chugging up hills.

Hello forum!

My legacy Gt has been acting up lately.

I noticed in the mornings my idle rpm is around 1.5+K

When the engine is warm it drops below 500 rpm and sounds like ti wants to stall.

Yesterday the check engine flashed while going up a hill so immediately stopped at an Autozone to get the code read. (p0302)

 

This morning I replaced the sparks plugs with SILFR6A and no luck. There was no oil around them either.

 

My question is what should I go through next?

Only "mod" I have is a K&N drop in filter and snorkel delete.

Was thinking to clean the MAF how should I go about doing that I know they are sensitive?

 

My battery is also OEM and might need to be replaced should that be causes any issues?

 

Also when I press the gas @ idle it seems to hesitate before getting power.

 

Thanks for reading and hopefully I can figure this out!

[here's some pics of the idle rpms]

http://i39.tinypic.com/2hp3vqr.jpg

http://i44.tinypic.com/30ddqon.jpg

Front O2 sensor for you too.

Ok thanks JMP I'll check that out.

 

Just a little update on my situation.

 

I cleaned the MAF sensor, it was pretty black on one side.

I also popped the tmic off and took a look down the throttle body hose and it was caked with sludge.

Don't know what that substance is but I cleaned it out.

 

Hooked the battery back up let it idle for 5 minutes and drove it down the street.

So far it hasn't dipped below 500 rpm and sits at around 800-900 and no check engine. Is this a normal idle?

 

While I had the tmic off i noticed a 1/2 gaping hole in the turbo inlet hose where it actually meets the turbo. Seems like it melted around where the clamp was and created a hole.

Would this be affecting my misfires and crappy idle?

Also what turbo inlet hose would you recommend getting? Try to find a OEM or buy an Avo or Perrin?

 

Thanks for reading!

Aftermarket turbo inlet hose will be a much more durable piece but they are a pain to put in. I have Perrin and have had good success with it. That hole can DEFINITELY cause you some driveability issues as it's a post MAF leak so the ECM is not reading anything near what it should be reading.

 

800-900 rpm is perfect idle speed and if it's smooth, then you should be good.

Cool thanks! The Perrin inlet is being shipped. I did get the CEL back. Let's hope the inlet solves issues. Will update once installed.

Alright so I have an update.

I finally got the Perrin Inlet installed (what a nightmare that is).

The car idles a lot better now and has more power.

The problem still persists when I go up hills though. Check Engine flashes for like 3 seconds and goes away.

 

What should be the next step? The front o2 sensor? Where is that located? And if you could recommend one that is compatible (there's so many I don't know which one)

P0302 - Cylinder 2 misfire detected.

 

IMO burnt exhaust valve in #2 cylinder.

 

Have a compression test done, and a leak down test if needed.

Hey guys just an update.

After replacing the coil packs, injectors, o2 sensor and plugs still having the issue on cylinder 2.

I just did a compression test tonight and results are 1- 130/ 2-130 /3-135 /4-132. This seems OK to me, is it?

Some other things to note it has the perrin inlet and a k&n should it be tuned? i really want to bring it to a tuner so i can see whats going on.

Another suggestions? I'm learning a lot about this car so keep em coming haha. thanks

Anyone?

Run a data log and do a leak test. You may have a vacuum leak or a bad sensor, but without doing a log it's hard to decide if you have a sensor that's not working correctly. MAF, MAP, O2, Throttle Position...

Did another compression test. 95 on cylinder 2.

Engine is apart. Valve seat issue. Getting new heads, valves, pistons, and timing belt.

I had about the same problem at 91,000 miles. I had the same 302 code. Burnt valve.