plzzzzzzzzz helppppppppp 02 ser need help fast

[specina21]

ok so my car was working fine untill we ported the headers and the throttle body we where done took out for a test drive it did awesome but then i raned out of gas we towed the car back put gas but now it doesnt work it doesnt want to go over 3000 rpms and the engine is stuttering can anyone help me plz i was thinking it was the fuel filter or the mass air sensor can any one help oh and it wasnt getting any presure from the fuel pump

[Dank02seR]

man it sounds like your MAF but i dont think running out of gas would cause that to go out but i know our 02's are known for having bad MAF's

is your service engine light on? my was throwing a code saying my MAF was bad after i drove in the rain with my CAI on instead of paying hundreds i took it off and cleaned it with MAF Cleaner i think made by CNC or something like that then i did the reset below hope this helps bud.

SES/Check Engine Light

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CHECK ENGINE LIGHT RESET/DIAGNOSTIC PROCEDURE

In car ECM Diagnostics/ECM Reset procedure:

1) Sit in the driver's seat. 2) Turn the ignition key to the ON position and wait three seconds. (Do not start the car.) 3) Fully depress and release the accelerator pedal five times in less than five seconds. 4) Wait exactly seven seconds. Fully depress the accelerator pedal for ten seconds until the MIL light flashes. 5) Release the accelerator pedal and start counting flashes to obtain the four-digit trouble code.

Long flashes (0.6 seconds) indicate the first digit of the code; count the blinks one through nine and write down the first digit. (Ten blinks indicates a zero.) The next three digits follow in turn in the same fashion except with faster blinks (0.3 second) and a 1.0-second pause between digits.

The ECM code repeats itself until you turn the ignition key to the OFF position, at which point the ECM resets itself to standard get-in-and-drive-the-car mode. You can look up the trouble codes in the ESM/FSM; there's a bunch of them. In the ESM, refer to page EC-639. Additionally, if you get four blinks of ten (0000), the ECM is indicating no malfunction.

Clearing

You can clear the code (and the annoying MIL) by holding down the accelerator pedal for more than 10 seconds while in Diagnostic Test Mode II. When you release the pedal, the ECM erases the trouble code(s).

[nametakennow]

No pressure from the fuel pump is probably because you ran it dry. Fuel-injected cars do NOT like to run out of gas. You may have damaged anything from the pump itself to the injectors.

It sounds like it went into safe mode. Read the OBDII codes, if there are any, and post them up.

[specina21]

ok so i changed my maf and car is working did a diagnostic test gave me code 0031??? but now everytime im at a light my rpms go up then down then up then down how can i fix that ????

[nametakennow]

Try resetting the idle. Instructions are in the Common Fixes thread linked in the Table of Contents in my signature.

Could be that your TPS is bad.

[specina21]

ok i tried reseting the idle but nothing everytime i am stoped my rpms go to 2000rpms and then back down to 1 and then back to 2 and it does that everytime i stop

[nametakennow]

Re-reading your first post, what did you mean by porting the throttle body? If the throttle plate doesn't cover the entrance like it used to, your car may be struggling to figure out what to do at closed throttle.

It's either that, the TPS, or you killed some part(s) of the fuel system by running out of gas.

[specina21]

no the throttle is still the same whats a tps ?

[nametakennow]

Then what DID you do? Your first post says you ported the throttle body and the header.

TPS = throttle position sensor, they tend to go bad easily on SE-Rs.

[specina21]

hte inside of the throttle was made bigger for more air but it still fits perfect theres no openings they told me i need a tune on my car but dont know who can tune it for me

[nametakennow]

A piggyback engine management system (such as an SAFCII) should be able to correct for it.

You'll need to install it, plug a wideband O2 sensor in, and set the fuel correction from there.

[specina21]

thanks i fixed the rpm issue but they say if i tune it will give me more power bec of the mods i have done to the car

[specina21]

i really wanna buy the safcII but do i have to buy a wideband 02 sensor?? and i was reading the instructions and it seems pretty complicated do u have one or know who has one that might be able to help me if i get it

[nametakennow]

It's not complicated. I used to have one when my car was turbo'd. I found a local guy who had a wideband to help me tune it. Tuning itself is very easy, so if you can find someone with a wideband or have the money to get one yourself, it's a good idea and fairly easy way to get a few more horsepower if you have significant mods. There is no way to tune without a wideband. The whole point is that you're optimizing the A/F ratio, so if you don't measure it (via a wideband), there's no way to tell if you're adjustments are doing anything.

If the only thing you've done is a little porting, I doubt you'll get much out of an SAFCII (or any other) tune. If you have some other mods (intake, cams, full exhaust, really the cams are the important part) then it will be worth more.

However, in your case it may be easier to get an ECU reflash done. Run a search, the details have been discussed and I don't remember them off the top of my head.

[specina21]

thanks i guess i should do more mods first all i have is the catback, header,intake ,and the port ill research how to reflash the ecu