Ok I'm Lost

[TLKSCHP]

I have a scan file of a someone here with a 402 that was mail ordered tuned by Ed wright. I have EFI and LS1 edit but still don't have a clue. All I use it for is speedo adjustments and little things . His car is running like crap will someone look at it and see how bad it looks. He is planning on running at the track Sunday and my gut says he shouldn't. What he has is a 2000 F body 402, Fast 90, 90 setup 238/242 608/612 114 I think. I also have his tune downloaded. Not looking for a tune but maybe help understanding what I'm looking at. Let me know and I will email the info unless someone can point me to a free host site

Thanks

[MN C5]

Attach the scan file and you'll get more responses

[joecar]

someone can point me to a free host site
Do SHIFT-PrintScreen while the log chart is on your screen,
paste into IrfanView (get freeware from www.irfanview.com (http://www.irfanview.com)) and save as a .png file (compression 4 is quite good);

then goto http://imageshack.us and upload the .png file, and copy the last link displayed on the page;

then in this thread, use the yellow/grey mountian picture button and paste in the link and post the reply.

[TLKSCHP]

I guess I don't understand what screen you want. :nixweiss: this one
http://f5.putfile.com/5/12517190194.png

[Bruce Melton]

I think I agree you should not run it. Seems you have a lot of work ahead and poor prospects without a better understanding a wideband.

[ringram]

Its adding a decent bit of fuel from trims.

I think you need to start with the basics. Might be best to get some help to get in a stable baseline. If you want to go further get yourself a WB and start reading. There are lots of tutorials about.

Basically once you have your idle stable. You need to disable the maf and go into open loop (many never re-enable the maf). Once in open loop with modifiers like dfco and COT disabled you can start to "see" whats wrong and fix it.

If you have it hooked up and logging you have already come a good way. Id do lots of reading and you will get there in the end. It doesnt look too bad, there is no KR which is good.

Does it run ok in midrange and wot? If its just idle thats crusty, then it might not be all that bad.

Injector duty cycle looks very low, is the injector flow matched to the injectors?

[TLKSCHP]

I have a wideband I could use but he doesn't have a spare bung and doesn't want to add one. He brought it over originally just so I could check and see if it was locked and it wasn't. After hearing the car I said it didn't sound right and asked to scan it. WOT it's in knock the whole time. To be honest I think I could spank it with my stock LS1 if it wasn't broke LOL. Flexplate exploded at 6200 RPM but thats another story. But my car broke just as I was starting to learn this stuff. Just got the wideband on and was ready to try the auto tune when it broke. I told him I would post and see if it looked real bad. when looking at the fuel trims should they stay steady and around what percent is ideal?

[TLKSCHP]

Here it is at the WOT
http://f5.putfile.com/5/12519292069.png

[joecar]

Fuel trims should stay steady on 0%.

Looks like at WOT it's too lean; when it goes WOT the trims go to zero because they were positive (adding fuel) before WOT.

Does he have different injectors...?

Needs tuning: IFR, VE, PE and possibly MAF tables (or toss the MAF).

[TLKSCHP]

he is running 42lbs injectors. I called him today to talk about it and he doesn't seem concerned. At least I can learn from it :D

[caver]

Looks like a engine on its way to the scrapheap unless he fixes it. I reckon a good start is to add about 20% to the VE table and about 10% to the maf. It will more than likely be very rich but it wont break.

[ringram]

Yeah o2mv is too low at WOT, normally around 850mv for a std WOT run. This looks like 0mv!
Looks almost like no tune at all. You need to set your engine capacity too. Default is for 350cid, check B0104.
Tell him not to drive it till its tuned. As mentioned it will be the death of it. Especially if he is going WOT on it now. Part throttle looked ok because O2 is adding fuel. Stay out of WOT whatever happens till its tuned properly.
Tell Ed whats happening, he did me a tune a few years back for my camaro and sent me another chip to tweak things.
Im sure he will set you right.

[TLKSCHP]

Thanks for the responses, This is really helping me learn. He doesn't seem to think their is a big problem and plans on racing anyway. :nixweiss: I checked B0104 and it's correct at 823cc. I have another guy with a 408 in my garage thats getting ready for a tune, not sure who he is using, I think soundenginier on LS1 tech is doing it. Hopefully I will have mine going again soon and will be trying to sneek a cam and heads past the wife.

[mattsls1]

Well he took it to the track today and went 11.8 at 113 with a 1.68 60 foot.

They think he broke his clutch but who knows. He is pretty stubborn when we tell him he needs someone to tune his car.

[TLKSCHP]

Well for those that would like to know. It sounds like he should have waited for the tune. All he knows at this point is the engine is broke, metal in the pan and sounds real bad when he cranks it over. He insists it wasn't from the tune. But he seemed happy he made an 11 sec. pass, I would be :bawl:

[joecar]

Detonation/pre-ignition/knock/ping kills engines fast. :bawl:

Any chance of taking pics of the damage, we like to "back-seat" analyze.;)

[mattsls1]

I doubt he will post pics. He doesn't do the online thing really. But he was pretty sure it was a bearing. There was bronze on the oil plug......

[Bruce Melton]

What a surprise. What an Idiot.

[Doc]

And on the next edition of "When bad tunes Kill"....

[TAQuickness]

well at least he realized he would need bigger injectors...

[ringram]

Nice, detonation will pound the bearings. Basically forcing the piston back down the bore before it gets to TDC.

Hammering the bearings to pieces.

Another happy ending.

[S10Wildside]

Fuel trims should stay steady on 0%.

Looks like at WOT it's too lean; when it goes WOT the trims go to zero because they were positive (adding fuel) before WOT.


Can you please expand on this?