99 boxster Need help ASAP!

[JAAY]

skip it all and yank the motor! 3.4 time Just kidding. i'm sure you will figure it all out soon. It seems that you are narrowing it down. If you changed all that already I am not really sure what to check next. Good luck.

[dirkdiggler]

I had Miss-fire codes and just replacing my spark plugs solved that issue.....cheap and worth a try.

[Topless]

You still have not diagnosed your car. You could easily spend another $3k-$4K on parts and not fix the problem. Get all the error codes, year-mileage-model, part #s for all recent repairs and list any other recent mods/repairs. K&N oiled air filter? With this info we can help you.

[Porsche_Baller]

So, I stopped by advanced auto and got the car on the code reader here's what i got... P0300, P0302, P0130, P1115, P1119, P1319, P1313, P1314, and P1315.
I know alot right? I got him to clear the codes for me. Yet to say as soon as I left target it started to throw codes again.
As far as replacement parts. I replaced them all myself so don't actually have receipts but i can give you a general timeline.
May 2010- MAF sensor, 6 coil packs, 2 O2 sensors, oil change, and 6 spark plugs.
September 2010- Air filter (OEM non-oil), and fuel filter.
Ive been experiencing this problem for a wile. These are the things Ive tried to fix it but nothing has worked.
March 2011- 2 O2 sensors (after cats) and another oil change.
All the other modifications have been cosmetic. LED tail lights, HID headlight kit (non-litronic), LED undercover dash lights (for running 911 calls).
Its a 1999 986 boxster, 130,145 miles.
Pretty much everything I have replaced on the car has been BOSCH (MAF, O2 sensors, coil packs, fuel filter, and air filter.
As far as oil I use Mobil1 high mileage 10w-40.

HOPE THIS INFO HELPS!

[mikefocke]

These 2 are misfires

P0300, P0302,

Another O2 sensor related code but an interesting comment beyond the suggested causes is contaminated air flow. What is the condition of the AUS? Have you looked at the throttle body for evidence that it is highly oil contaminated? Also could be:
– Oxygen sensor
– Wiring harness
– ECM

P0130

The following codes are the 2 O2 sensors nearest the engine reporting below the expected threshold

P1115,

P1119,

The following codes are misfires

P1319, P1313, P1314, and P1315.

So lets pull the plugs and see if they are contaminated. Don't just change them as we have to get to the source. Look at the condition of the air intake. A DIY guide to cleaning the throttle body is at pedrosgarage.com

And buy yourself a code reader. Actron or Durametric depending on your aptitude and budget.

[RandallNeighbour]

Originally Posted by mikefocke

What is the condition of the AUS?

I think Mike meant AOS or Air-Oil Separator. Just wanted to make sure you're not confused, Porsche_Baller.

One more thought—you know, at this rate a trip to the dealer or a well-respected indy Pcar mechanic's shop might be a cheaper solution than trying to troubleshoot and fix this problem yourself.

[Topless]

P1115 ,p1119- O2 sensor heating below threshold.
Bad O2 sensors, wrong sensors for your car model, mis-wired sensors, damaged wire harness. You currently have no working O2 sensors so no monitoring of your mixture. This can damage your cats and potentially your engine over time. Probably the cause for misfire also as the DME is blindly attempting to control mixture.

Also there are several different MAF sensors so you would be wise to confirm the part # for the one you installed and make sure it is the right one for your car year/model.

Time to knuckle down and retrace all recent repairs to see where things went sideways. Good luck!