Originally posted by SHOgoFast:
Update: spent a bunch of money on vacation so still have not replaced the wires... but that is planned for the very near future.

The fuel pressure is still at 30 psi. I am running a tune from Keith at ADC that added 25% more fuel and that improved the AFR quite a bit, nice and rich now (11-12 under accel). I feel a lot better with the conservative AFR until refined tuning is done.

Here is the most interesting part. It has been hot as all hell lately and I have been using the AC quite a bit. When the AC is on the car runs much more smoothly, doesnt stall when coming to a stop and misses less frequently when idleing. Can a slight increase in load from the ac really have that big of an impact?

Lastly, while cruising with very slight throttle, just enough to maintain a constant speed or accel very slowly, the AFR goes to 15+, should I be concerned? If I give it any more pedal it goes down into the 12-13.5 range and if I give it more it goes into the 11s.





Yes, if you have a vacuum leak, or conversely you have too much fuel in at idle, then when you kick up the load a bit it has more opportunity to make corrections.

Better make sure you aren't leaking air past the throttlebody area somehow, that your crankcase venting system is hooked up correctly. I think you are chasing a problem that is definitely related somehow to the computer NOT knowing accurately how much air/fuel is going into the engine. Make sure you check your O2 sensors for proper switching too, and use them to diagnose if you are getting the correct A/F at idle and cruise. With everything else looking good and normal then it may be that your MAF function in the pcm is not matching the actual MAF

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black