Idle Problem, used search, mine is a little different

[Boostin2High]

Ok Im having a little bit of an idle problem. Im goin to try and explain this the best I can, 1
day my car was running perfectly fine, then I changed my oil from Mobil 1 to Royal Purple

and did my spark plugs as well. Well ever since then my idle has been all messed. Basiclly

what it does is every couple of days at randoms time, If Im sitting at a stop light the idle

will jump alittle then almost immediatly drop to about 400-500 rpms and just bogg.

Sometimes it will die sometimes it wont. If I give it a little gas it a kinda seems hesitint to

wanna go back up, the harder I try to rev it the harder it tries to die..Now..it usually only

does it when it a little bit colder outside. I have tried many things to try to fix it, and there

are as follows:

Checked and rechecked spark plug gap. (Tried .28, .29, .30)
Fiddled with BISS screw (wich by the way did the same thing wether all the way open or closed.)
Checked throttle cable bracket.
Pulled and cleaned IAC.
Tried adjusting throttle body.
Checked OHM reading on IAC, all was well.

None of these things seem to work, but here again as I stated, usually does it about 3 days out of the week and roughly 4 stops out of an all day drive.

And yes, I spaced all the lines on perpose to try to make for easier reading.

-Rob

 

[2geclipse565]

What kind of spark plugs did you use?

 

[Boostin2High]

Ngk BPR7es, same ones Ive always used, w/o a problem

 

[BoostFrenzy]

You obviously didn't search hard enough.

Here

I am starting to think it has something to do with the shitty MAS we have. My AFC says my intake hz is about 35-40 when it bogs down. So I think the MAS is reading it wrong and making the car go lean for some reason.

 

[Boostin2High]

well I'll know soon enough, because my maft is on its way.

 

[Locke]

May be a faulty EGR system, as well.

 

[Calan]

Fiddled with BISS screw (wich by the way did the same thing wether all the way open or closed.)

You can't just "fiddle" with the BISS screw. You need to put the ECU into BISS adjustment mode.

Don't have any links handy, but search for BISS adjustment ;-)

 

[GVR4592]

Any time you have an idle issue the first thing you should do is check for boost/vacuum leaks.

Here's the idle speed adjustment procedure:

http://vfaq.com/mods/BISS-2G.html

I wouldn't install the maf-t until you get this problem sorted out, you're just opening another can of worms with that thing.