I did some very long runs to try and see if VEMaster can make driveability a little better. But after looking at the logs I see a trend of my heated O2's left bank looking kinda lean. Exhaust/valvetrain any common problems that may cause a false lean? I have DRM long tubes, Corvette 1993, DELTEQ ignition and Earl Pressure header gaskets.
http://www.mediafire.com/?9wwcxxwmzin

 

Can O2 sensors cause this? I went from non heated to heated O2's and a DELTEQ igintion system. Didnt run like this before those items, and Wideband shows 14.2-14.5 at cruise and 13.1-12.7 at WOT. Wideband is in right pipe behind header collector.
I just looked at the plugs, all were a very light tan, with no indication of pre ignition, based on many years of looking at plugs and pretty pics on the net to help.
All the header gaskets are clean, as no evidence of exhaust leaks, no burn marks etc and headers are coated and I see no leaks that are evident.
The left O2 sensor, AC Delcos, was a tad, about a mm loose. I dont know if that is enough to cause a leak, but it was there.

 

I downloaded your files, but they wouldn't open up correctly with my copy of DataMaster. The data was not appearing in the correct locations.... e.g. "cell 159". Like it was indexed incorrectly or meant to be opened with some other version of the software. Can you do an "export as .csv"?

 

I will try to export it to .csv Is that an excel program?
http://www.mediafire.com/?darnencxxja

 

See if this works
http://www.mediafire.com/?35gzczdy222

 

I opened the first one and it opened fine in Excel (.csv is comma separated variable, and can be opened by a number of programs).

Biggest problem I see is that the file is huge... Appears the log (FSStart) is over 50 minutes long, with 26,200 lines of data. Don't need to do that, unless you are simply going to log continuously until some sort of an intermittent problem happens, and you can somehow identify the lines of data where it happened.

Also, the .csv file does not normally include the DTC codes, and the corrupt file that I opened with TTS DataMaster showed several existing codes. Do you see any DTC codes when you open it with your copy?

I'll try and take a look at these. My time is limited and I have a few people who have been waiting for weeks for some feedback, but I'll try and squeeze it in.

 

Left side is running very rich.... long term in Cell 16 (idle) is bottomed out at 108 on both sides, and the short term is down to 77 and still pulling out fuel. Right side isn't much better at idle.

At idle, MAP is ~58. How big is the cam?

If you don't understand why a long term fuel correction of 108 indicates the enigne would be running excessively rich without the corrections, read this:

http://members.aol.com/InjuneerZZ/ScanMast.htm

I'll continue to look at them.

 

I really appreciate you looking at the data. I have shorter ones I can load up. I was doing long files to see trends.
When I scan her their are no codes, and Datamaster doesnt say there are any.
Here are two much shorter files.
http://www.mediafire.com/?d19en9oisyi

 

My cam is 230/236 in/ex 112 LS, 544 in 555 ex in a 396 with 11.1 comp,

 

Probably be a lot better if you listed all the mods in the first post. Makes it a lot easier to evaluate the data.

Never understand whyh EVERYONE doesn't use the "signature" field. Sometimes getting the basic data is like pulling teeth.

 

Mods in signature now.
Some forums have the signature to where you have to select it as it wont default to show it anymore, so I dont update allot of forums I go to. Sorry.

 

Start by tracking down why its got 108 BLM's at idle. Who did the tune? Were they aware of the correct injector size and the actual fuel pressure you are running? Have you verified the size of your injectors? Have you tested your fuel pressure? For some reason its running pig rich at idle, and the PCM is pulling out fuel like crazy. On nthe left side, its reached the limit of how much fuel it can pull out (15%) and its using the short terms to pull out another huge amount.... in effect, looking at 108 BLM's and INT's in the 70's means the PCM is pulling out 50% of the fuel it thought the engine needed.

I assume the 93 Corvette engine is like the F-Body, and runs speed-density? You have to look at the MAP and IAT to make sure its calculating the density right. High MAP results from the cam overlap, so the VE should have been adjusted to compensate.

 

I wont say who did the tune, but in all fairness when it was originally done the IAC was bad and I had about 90% WOT as the throttle body wasn't correct, so this may have had a little bit to do with the idle etc.
My fuel pressure is 43.5 and the injectors are Ford SVO 30#, flowed to within 1%. The constant is for 30#, set at around 31.7 I believe.
I will look at the MAP and IAT to verify it is correct. I may swap out to another set and see what she does. It is Speed Density, and the tuner is well versed in Speed Density.

 

Considering your cam, your idle kpa is fine. Check for leaks around your O2 sensors. If none, then it's very likely the VE tables since you're running SD.

I had to lower the stock tune by a good 20-25 points in the idle/cruising cells for my 236/242/114 cam, to get BLMs back to ~128 (my idle kpa is about 60).

Edit: One more thing... you'll need to tweak your individual cylinder fuel trim tables to fix splits too, especially off-idle. I had to do that with my cam, and now it's running within a few BLM points of each other, both at and off idle.

 

I just put 2 new sensors in, and they came with sensor safe anti seize grease for the threads. The other sensors I had had nothing. Also, the collector is getting a accuseal clamp as it was pulled towards the cat back exhaust when the exhaust bracket on transmission was put in backwards it pulled it about an inch. It is right behind the O2 sensor. I put smoke and even light in there at night and no smoke or light came out or was visible.
Its a Corvette so the exhaust hanger is different than the F body.
I ran three very different tunes, and the left side does this no matter what. I may try a stock tune to really see what she does for the fun of it.
Also, the 93 is Batch fire so I have no capability to select each cylinder to fine tune. I dont even have a left right bank tuning feature. I may email TC and see if this is possible with Speed Density batch fire.
Thanks Steve