I need some help reading my datalog.

[justbob]

Since I openly admit to being computer stupid, but trying really hard to catch up to technology, I figured I'd ask for some assisstance. First off my car has been acting up for quite some time, but only at WOT or close to it.

1. It has a constant stumble at WOT(feels like an old plugged carb).

2. Engine dies at WOT, after three or so seconds, not every time, but quite often.

3. At cold idle it sounds like it has some nice cams.

4. Starts usually only if I give it a pinch of gas when allready warm.

5. I seem to get twice the condinsate smoke out the drivers side exhaust.

6. Everytime I try to WOT during datalog, livelink loses signal immediately. Possibly my OS not able to keep up?

I also noticed that bank 1 rear o2 sensor is not reading any voltage at all. I have continuesly cleaned the IAC and the MAF. I have cleaned the contacts on the chip. I have also changed the plugs and the FRPS to get no difference. I am probably dealing with more than one issue here, but I am not throwing any codes. The car has passed emissions with flying colors also.

She runs like a top during normal driving. HELP! PALEASE!

Here is two different datalogs. Tell me if you need a different reading

The WOT is at the very end of both charts(EDIT: charts too long, what you see is where the livelink lost signal), right where I started to climb in RPM's. It loses signal before the tires even break free. Both runs were at around 40 mph.

Run 1 with FPDC/MAF AD counts/ Bank 1 front o2/Bank 1 rear/Bank 2 front/ bank 2 rear

Time (sec)FUEL_PMP_DCMAF_AD_COUNTSO 2_B1_FRONT_VO2_B1_REAR_VO2_B2_ FRONT_VO2_B2_REAR_V
5.814173/0.388001/783/0.926758/0/.924805 /0.893555



Run 2 air charge/coolant temp/FPDC/MAF AD counts.

Time (sec)AIR_CHG_CURRCOOLANT_TEMPF UEL_PMP_DCMAF_AD_COUNTS

32.63134/0.001205/194 /0.376312/724

[SpartaPerformance]

You have no voltage reading on that O2 at all and you're not getting any codes??

[justbob]

nope, nada. Having a chip wouldn't cause the light to not come on would it?

[justbob]

Also I noticed that my AFR guage won't hold steady. It reads anywhere from 10.1 - 13.0 at any given time at any speed under load with Zero detonation. I downloaded an older version (4.3) of livelink, hopefully it won't lose connection everytime I snap the throttle like version 6.1. 4.3 didn't have any warnings about PC speed like 6.1 did. I'll try it again tomorrow. Start with FPDC, pressure at rail and pump, voltage, MAF, and go from there???

[Blown3.8]

The rear o2s maybe turned off in the tune. Not sure if the stock trilogy tune does that tho, I would guess no.

Can you post a line graph for your datalogs? Like this.

[justbob]

I tried that first Chris, but couldn't figure out how, it just kept saving it to excel, in chart form. I tried it this morning with the 4.3 version. This time the livelink just locked up solid again and didn't even tell me lost connection. I tried to datalog with just the Xcal3 and it was successful, now I just need to figure out how to retrieve it and post it. I can say the MAF shot up to just over 1000 counts which means pegged right? And the FPDC also shot up to .49 quick.

Pretending that I do infact have a bad MAF, that would cause the fuel pump to run harder, engine run rich, and die out at times, correct? A rear o2 wouldn't send the MAF into a frenzy, and cause all these symptoms would it? Plus no light, and passed emissions?? I'm really glad Trilogy is way freakin safe, the timing must be turned wayyy down.

The other rear o2 sensor is reading really low volts like it should, so no, it looks as if they are turned on.

[Blown3.8]

Can you post the whole exel spread sheet?

Or look at the spreadsheet and see where the numbers go whacky?

I myself could never get the xcal2 to talk to the computer so i could look at it on the computer screen while it was logging, so I don't think I'll be much help trying to figure out how to post the line graph.

the rear o2s just tell the computer the cats are working, and if it isn't reading right it should kick a code.

Have you checked the spark plugs right after it died out to see if they are black? I would check that, if you can.

Also check the FRPS. Take the vacuum line off and see if it is wet in the line. or after you take the line off turn the key on and see if it squirts fuel.

[blackhueys]

kinda reminds me of when I had a plugged up cat converter. Replaced them all with new ones ran like new. just my 2 cents.

[justbob]

Chris: When I tried to post the excel spreadsheet it would only post sideways creating a mile wide post. The longer I hold the throttle the higher the numbers consistently went. The AFR was the one that was screwy throught the whole RPM.

The plugs were in great shape, but replaced anyway. The FRPS line had a slight smell of fuel so I justified replacing that as well. The only thing that I could have possibly messed up is when I hooked up the IAT 2 in preparation to getting my dyno tune, but never was able to get the tune, due to getting unemployed. There was never a difference in performance after I did that, this came on awile after that.

Blackhueys: I had also thought of that, especially considering the difference in smoke from side to side. Musclemerc was VERY generous and sent me some great condition down pipes that he had laying around. I was just trying to make sure there is not something else to blame. I've just never been the type to replace parts without clear evidence of failure, but i'm going crazy here and i'm about to do whatever it takes.

[LANDY]

take a pic of it on the computer, thats what i did.

[Zack]

Just come over one day Bob and we will fix your turd.

[guspech750]

Just come over one day Bob and we will fix your turd.
Zack said "Turd".LOL