my evo is running bad *** h ell. it threw some weird *** codes. engine overboost condition, intake air temp. circuit high input, 02 sensor circuit high volts(bank1 sensor2), catalyst efficiency below threshold(bank1), and map/baro circuit low input. can someone help me on this?.... i got an intake filter, megan racing downpipe, high flow cat, megan racing cat back, boost 18 with mbc, and walboro fuel pump. someone please help me.. my car runs like **** now... cant even pull an integra ls. it chokes when i slam my acc.
any help will be great... thanks

 

If you have that many problems you're going to have to take it to a professional. One or two codes you could fix yourself, but 6-7 would be a little rough.

 

i'm not sure about the codes but did you get the intake and fuel pump tuned?

 

I run a similar setup. The O2 codes are because that Megan Racing is a test pipe and not a cat. You will need anti-foulers to get rid of the O2 code. As far as overboosting reset your ECU by pulling the battery for a few minutes and make sure you have NO intake leaks and make sure the 18psi your running is actually 18psi. Typically you only get an overboost condition when you are doing just that...running too much boost. The overboost CEL will cause other sensor to mess up. Make sure the MAF is tight and that everything is solid. Your setup should not give you problems unless something has changed.

 

thanks for the replys i will try that... any more suggestions will helpful

 

What are you doing for engine management? In general you shouldn't do that much stuff and not tune for it. If you are untuned thats probably a big part of the problem.

 

Have you run octane booster or race gas? Your O2 sensors might be fouled as well.

 

I disagree, I am untuned and have 0 problems. I have more mods than he does. I am sure my car can do better, although tuning is my next purchase.

 

Why spend all that money on parts and not take advantage of their full potential by getting tuned? That makes no sense.

Now I agree that's probably not be the cause of his problem but, it wouldn't hurt to get the A/F's and everything else where they should be.

 

Hmm.. Weird.. Did you disconnect anything that your aware of?

What modifications do you have on the car?

If all this happened at once, and you installed an S-AFC, Emanage, then its how its wired..
If you bought the car used, take a look at the wiring harness to the ECU, its possible its coming loose or had some splices for aftermarket components that were removed, that weren't properly reconnected.


But all of those codes at the same time can be a disconnected wiring harness or problem with the ECU..

The Intake Temp sensor is on the MAF, the Baro (Map sensor) is on the Intake manifold, nowhere near eachother, O2 sensor is under the car.. Sounds like a few things may have gotten knocked out or disconnected or maybe the wiring got damaged.. The O2 sensor is likely due to the Test pipe though so check the connection, but don't work about the Catalyst efficiency code for the moment.

If the MAF is misbehaving or damaged, it will run like crap, stumble and run really rich (if it runs right at all)

 

I think it would help if you listed the code #s and the exact list of mods you have on your car, be detailed and specific. As far as the O2 sensor codes are concerned, I agree with the rest that is probably because of your test pipe. I wouldn't worry to much about it but the rest of your issues seem to point to your intake and MBC.

 

sorry to hear

 

the codes are P0420, P0138, P0234, P0113, P0107, P0234.

 

i have the hallman pro boost manual boost control set at 18 psi, with the blowoffvalve line and wastegate. I also have a cone shaped air filter, walboro fuel pump, iridium spark plugs, and megan racing turbo back exhaust with high flow cat. thats about it. until i get my flash done.

 

the codes are P0420, P0138, P0234, P0113, P0107.
DTC P0113: Intake Air Temperature Circuit High Input
DTC P0107: Barometric Pressure Circuit Low Input
DTC P0234: Turbocharger Wastegate System Malfunction
DTC P0420: Catalyst Efficiency Below Threshold

what the **** does this mean?