sligh93

I've located my last three emissions reports. Take a gander.

03/2003:

HCppm IDLE limit: 220
HCppm IDLE test: 447 FAIL

HCppm @2500rpm limit: 220
HCppm @2500rpm test: 151

CO% IDLE limit: 1.2%
CO% IDLE test: .93%

CO% @2500rpm limit: 1.2%
CO% @2500rpm test: 1.15%

This is the first emissions test after i bought the car. The ultimate solution involved a new 4.0bar FPR and a new Stromung center section (cat included). Here is the result. Note, the limits changed during that time:


04/2003:

HCppm IDLE limit: 120
HCppm IDLE test: 48

HCppm @2500rpm limit: 120
HCppm @2500rpm test: 68

CO% IDLE limit: 1.0%
CO% IDLE test: .04%

CO% @2500rpm limit: 1.0%
CO% @2500rpm test: .14%

Passed with FLYING colors. Obviously, looking back on these results, the new cat was taking up the slack of an underlying problem. Here are my current results:


HCppm IDLE limit: 120
HCppm IDLE test: 322 FAIL

HCppm @2500rpm limit: 120
HCppm @2500rpm test: 309 FAIL

CO% IDLE limit: 1.0%
CO% IDLE test: .77%

CO% @2500rpm limit: 1.0%
CO% @2500rpm test: .74%

HC is high again like back in 03/2003 and the CO percentage is creeping back up to where it was in 03/2003.

With the high HC AND relatively high CO%, I can't figure out any other reason besides an overly rich mixture. If I assume that Bob Pastore's software isnt purposely running the engine rich at idle (no reason to), the only thing that i can imagine that would cause a rich mixture would be:

A leaky fuel injector

A airleak after the MAF?

What else?

In addition, code 2231 is present indicating one of these as the possible cause: Idle Speed Control, Idle speed adaptation limit exceeded, Sticky ISV, air leak

Is it time to pressure test the intake?


Thanks again for any advice in advance

Sandy

4Driver4

Tough one. Check the MAF to turbo hose. Beyond that, I'm stumped.

sligh93

Oh well. one response. I guess i'll have to noodle this one myself