horrible idle and stall out at idle

[tmadmsp]

Whenever I start up my car i pretty much have to rev it up and let the Bov blow before I can start driving it otherwise it will puke out on me. Have replace Wga with atp unit. In the process of swapping vaccum lines. Had a CEL but it went out after getting gas but still starts up like ass. Im thinking 1st O2 sensor or MAF. Any suggestions?

 

[orng1]

Do you have a boost/vac gauge, curious to know what the vacuum is. These cars always have vacuum leak issues.

 

[tmadmsp]

I have both, at initial start-up the car usually revs up to 1500 rpms like normal and hold -99 vac on the greddy and -20to -22 on the boost gauge. Once the RPM's start to drop to normal idle the vac goes to around -80 to -90 on the greddy and begins to die. The car also tries to keep me out of boost, can hear it spooling up but has major hesitation and starts to buck.

 

[tmadmsp]

Had the CEL read and it threw codes of p0131-"heated O2 sensor circuit low" input, probable cause lean a/f ratio, open or short circuit or faulty O2 sensor. Code P0103 Faulty MAF sensor. P0140-"o2 sensor no activity detected" and finally P0171- A/F ratio bank 1 probably causes: low fuel pressure, large vacuum leak, faulty MAF. This is all info from Autozone, i picked up some MAF sensor cleaner and am going to try that before replacing it. any other suggestions?

 

[FamiliaSpeed03]

This is the same problem I'm getting same thing your getting

 

[mazdaspeedp]

have you checked your hot and cold side pipes? they may be cracked

 

[tmadmsp]

I have hard pipes on mine and all the connections are tight just got done rechecking them while i was swapping vaccum hoses. i cleaned my MAF and that seems to have helped he start-up idle issue but still throwing a CEL, think its just time to suck it up and spend the cash for a new MAF since it has never been changed in the 60k miles ive put on it. Primary O2 sensor was changed shortly after i bought it.

 

[orng1]

Are we starting to go through MAFs now? This seems odd that they lasted so long and now all of a sudden a bunch are going bad around the same time.

 

[Pez]

In the process of swapping vaccum lines.

Are you sure all of your vac lines are still on and none of them came off, or got bumped off. That could also cause ruff idle.

 

[tmadmsp]

yeah i checked all the vaccum lines again today while i was replacing wire loom with some sweet blue colored stuff, cheap mod keeps me from getting bored. everything was still on and tight as far as intercooler pipes and intake go. the start-up idle has been a lot better, but still throwing a CEL

 

[tmadmsp]

yeah i checked all the vaccum lines again today while i was replacing wire loom with some sweet blue colored stuff, cheap mod keeps me from getting bored. everything was still on and tight as far as intercooler pipes and intake go. the start-up idle has been a lot better. any chance some of these CEL's could be related to the fact that the car doesnt have a cat? or should i give tuning and attempt once i replace the wideband that craped out on me?

 

[orng1]

What are you using to tell the ECU that the cat is fine? Non fouler, voltage clamp, anything?

 

[tmadmsp]

I am guessing nothing, i bought the car used a few years ago and the cat was already gone. did find a business card for MIL eliminators but not sure if it was ever installed by the previous owner

 

[Pez]

Well look down at the o2 sensor and youll be able to tell if the non fouler has been installed. If not throw one in there and thatll help out a lot

 

[orng1]

Make sure you add a non fouler to the O2 sensor under the car and not the one that's on the manifold.

 

[Pez]

Ya i forgot to mention that! Tks for the back up. Im running non fouler with corksport power series non cat and have zero issues. No cel or ruff idle. Ive had some idle issues but thats not due to exh. I just need the ss afc!

 

[tmadmsp]

there doesnt appear to be anything different about the 2nd O2 sensor. where can i find a non-fouler?

 

[tmadmsp]

nevermind i found a good thread on how to do it