Holographic77

2000 S4,73k miles, plugs were just replaced. As far as I know...the EGT sensor, coil packs, o2's and MAF are all original. I've always had a persistant stumbling idle (lightly). On a few occasions (3 time over the past year) the idle has gone extremely "lumpy" and started acting very eratic, almost to the point of stalling. This scenario happend last night. Today the idle is fine.

MAF?

Thanks.

VR6guy

Any 2000 with 73,000 miles has to have a jacked-up MAF at least.

Nick Gustas

The buildup makes air metering very inconsistent when the throttle is nearly closed.

<img src="http://tychl.txf.com/dirtytb.jpg">
<img src="http://tychl.txf.com/cleanertb-stillbit-o-carbon.jpg">

Holographic77

Throttle Body has been cleaned recently. So perhaps I should pick up a new Bosch MAF?

Holographic77

Just called IMPEX and can get BOSCH for 120$ new. I hear it's prone to failure though??

S4gasm (LoTR)

My MAF was replaced on my 2k for similiar reasons, so its quite possible.

Nick Gustas

Even if it doesn't stumble, it could still be bad Given your mileage, if it's the original maf, it's time for a new one.

Bosch is your only option for a MAF unless you convert to a M box ecu and rewire for Hitachi.

Holographic77

What is/was the downside to the BOSCH? Prone to failure?

PSYC0TIC ONE (USMC)

was constantly receiving EGT Bank 2 sensor bad fault, ordered one from ECS, should be here soon, hopefully today, so I can change it on saturday along with my oil change

StoneMan

Yep. Pretty much. It's a better meter, overall, but less reliable