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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.
-Adam-
2k Silver Frost #939 - 36K Miles
H&R + Koni + Mirko + Elky Mesh + Hella Optilux + K&N + LoTek + Mille Miglia EVO 17" + ADC T-28 Turbo + Magnaflow 3" S.S. + exhaust leaks + CEL light + more to come...
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Hard-core CEG'er
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Originally posted by SHOgoFast:
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.
thats normal. Looks at everyones dyno graphs from SZ. Phil eases into the gas and then goes to WOT. Before WOT its around 14-15:1.
Jim Hahn
1996 T-Red Contour SE Reborn 4/6/04
3.0L swap and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 4,700 rpm
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Hard-core CEG'er
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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
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My crankcase venting system is routed as follows: both vents are linked to a T that feeds into an oil catch can, and the output of the catch can is then introduced into the intake after the maf and before the turbo.
I will hunt for a vacuume leak too.
If in fact it is all pcm related, is that something i can expect to be sorted out by a quality tuner?
Also, noticed another drivability quirk today on the way home from work. At steady state operation, the car will surge very slightly and if i glance at the AFR gauge, the AFR will have jumped to mid 15s or higher only to settle back again to oscillate around 14.5-15.1 approx 5 seconds later.
-Adam-
2k Silver Frost #939 - 36K Miles
H&R + Koni + Mirko + Elky Mesh + Hella Optilux + K&N + LoTek + Mille Miglia EVO 17" + ADC T-28 Turbo + Magnaflow 3" S.S. + exhaust leaks + CEL light + more to come...
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The drivability issue you just described sounds like plug gap issues ... are you 100% sure your plugs are all gapped the same? Wife's explorer had a definite missfire occuring at steady state cruise ... turn out that 2 spark plugs where .003" out of spec 
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I guess it is possible my new plugs are off, but man I was careful to get everything equal. I plan to replace wires in the near future and I will x2 check the gaps at that time.
-Adam-
2k Silver Frost #939 - 36K Miles
H&R + Koni + Mirko + Elky Mesh + Hella Optilux + K&N + LoTek + Mille Miglia EVO 17" + ADC T-28 Turbo + Magnaflow 3" S.S. + exhaust leaks + CEL light + more to come...
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I have no life
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I have no life
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You used a feeler gauge and not one of those .99 disc gappers right?
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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even the 99c plug gapper works fine if you get them all even and are carefull. Most plugs will fire within a fairly large range of stock, but it is more an issue if they aren't consistently gapped, esp. on a wastespark system. But I disagree that it is plug gap.  If he was having a misfire due to plugs then his AF gauge would spike Rich,not lean as there would be unburnt fuel in the exhaust from that event. Instead he is experiencing a lean misfire from it going lean, and the subsequent surge. This has to be outside the ignition system. Possible causes are: - dip in the MAF voltage showing less air coming in and therefore fuel is reduced even though there is no real change in airflow; could be a faulty MAF (I had one do this to me  ) - same thing as above, pcm sees less air than is really present but instead it is introduced by a momentary vacuum leak. Such leaks can be caused by a cracked hose/line/gasket that vibration or temp changes could open up temporarily and allow unmetered air to enter. - faulty O2 sensor showing a sudden rich condition that the pcm corrects by leaning out fuel - intermittent connection on a single fuel injector/plug/wire The next step in this thing is to compare the upstream O2 sensors from both banks while cruising and see if the lean indication is present on both or just on one bank. This could narrow that particular problem down greatly and get you on track to finding the original problem.
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
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Originally posted by SHOgoFast:
I guess it is possible my new plugs are off, but man I was careful to get everything equal. I plan to replace wires in the near future and I will x2 check the gaps at that time.
Any new updates?
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
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No major developments. This thing is really becomeing frustrating. I recently moved back into an appartment...this is what is keeping me from making much headway. The check engine lights I get now are slow responce from the O2s, I am wondering if I have damaged them with the variety of rich lean conditions they have seen since the turbo went on. A vaccume leak is possible I guess but I am unable to detect it if it does exist.
I have been sending data logs to Keith at ADC for his help but the responces have been slow and no progress has been made. He is mostly concerned with the low fuel pressure. Last log I sent him had command voltage at the pump and some other fuel delivery related info.
I know I do have an exhaust leak at the rear header that needs to be addressed, but I would be shocked if that alone is the cause of all these issues, missing, low fuel pressure, surging at steady state operation.
I do have data logs I took with my xcal2 if anyone wants to see them.
On a side note, she did get her first full clay bar detail session last saturday...looks hot!!!
-Adam-
2k Silver Frost #939 - 36K Miles
H&R + Koni + Mirko + Elky Mesh + Hella Optilux + K&N + LoTek + Mille Miglia EVO 17" + ADC T-28 Turbo + Magnaflow 3" S.S. + exhaust leaks + CEL light + more to come...
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