firehawkclone

I just did a 98ls swap in my 95, with the only real hp upgrades being headers and ls6 intake. I do have all the normal reliability mods(oilpump, valvetrane, and all of the smog is turned off. Oh and im pretty sure it has an aftermarket MAF becuase the GM mark has been melted off.

The motor idles good, has 58/60psi all the way to WOT, and has only 1 code(452 EVAP low voltage)

Heres my dyno sheet


Any help would be great guys, I leave for my national race in 3days!

Thanks

SSP Racing

iTrader: (24)

Clearly some type of fueling issue if that AFR reading is correct, have a log or anything? I guess first things would be...

Has fuel pressure been verified? What pump do you have? What injectors? Are they sized properly in PCM? How is the car tuned (what mode is it in?)

Any chance of a really bad vacuum leak?

Frost

iTrader: (45)

It seems pretty silly to try and race it before it's ready...

You need to get it tuned. Your AFR is dead lean; it's not even like there is a mystery as to why it made what it did. That is why. You can try another MAF too, but it definitely needs to be addressed one way or another.

firehawkclone

No i don't have a log, and no access to a wideband. But i am working on it!

Fuel psi was taken right off the fuel rail, and it has the stock pump and injectors. A well known tuner did the tune, so im hoping it is correct.

I checked for a vac leak yesterday, but i will do everything again today. The only thing that im concernd about is the EVAP soleniod is still hooked up to the intake, but no elec connection to it. Im running a Techrod harness.

I borrowed EFIlive from a friend, so i'll get that going today along with a half dozen other little things. I'm off to triple check everything.......

It's has to be right before i go and waste all the time and money and the safety of my follow racers.

2Tightwads

If that AFR that was captured in your dyno run is correct your going to be buying a motor soon...its literally FUBAR'ED! Get a copy of the tune/log up here asap! AND please don't go to any track at this power level. Likely to be Ford Mustang dessert!

stevied916

iTrader: (30)

log the injector duty cycle. something isn't working correctly with it going that lean. How old is that fuel pump? Don't run that motor like that...I'm surprised it lasted as is

firehawkclone

Well i changed out the ALT, the old one was bad. The 98 needs a 500ohm resistor to work right, or it burns its self out. I also installed new 02's just because, and than rechecked for a VAC leak. I can't find anything to make it run this bad, or any sign of it running bad!

I have EFIlive going, but i can't make it work. So I had a friend come over who knows a little more than me, and we read the PCM. Well from what little he knows, it doesn't look like a whole lot of changes were made at all. But we can't get it to log the PCM!

I have a local tuner thats going to meet me tomorrow.....

Eddie 70

iTrader: (3)

Are you still running the LT fuel pump?

stevied916

iTrader: (30)

what pump are you running and what problems are you having with it connecting to the pcm?

firehawkclone

Its the LS pump from the doner car. Could it be kicking out the psi, but not the volume?

Can an aftermarket MAF do this?

I don't have clue what im doing, is the problem. Its asking me for a VIN, but i don't have a vin. I thought i read on EFI's site that it reads the PCM and not really the VIN.

Thanks guys

John

bmax

iTrader: (1)

Look here for info on vin input


http://forum.efilive.com/showthread....&highlight=vin

Brad

Eagle Performance

Are ALL the injectors working? Recently worked on an LT1 with similar issues, found out two of the injectors weren't working, (wiring harness). Quick way to check, with the engine running, touch each injector, you should be able to 'feel' it working/clicking.