6.0 ls1 austin healey dies when you plug in the maf

[TonyArme]

I start off first by saying i'm new to this and still learning. We have a 1955 austin healy that we have a 6.0 ls1 truck engine in with a professional products intake and a 5 pin maf. The computer and harness came from street and perfomance and when i called them they say they accidently wrote the tune for a 3 pin maf. is there a way to tune with the v2 and change it back to a 5 pin calibration or does the os need to be switched. the os in it right now is 09381344. The car runs as long as the maf is unplugged but as soon as you plug it in it dies. I'm trying to get to the point where i can start datalogging but i know something is wrong so i want to fix that first.

[Taz]

The calibration should run either (3 or 5 pin) OEM MAF if properly configured. Many adapter harnesses out there to allow switching between the two types. I have never used a Professional Products MAF - potentially part of the problem. Did it come with calibration data of any sort ?

OS09381344 is a 2000 MY OS - it would not have been my first choice.

Post your tune ... some of us will take a look.


Regards,
Taz

[joecar]

The MAF table can be edited (and will probably need to be given your MAF ducting is non-stock).

[TonyArme]

i'll post up the tune tomorrow morning. Sorry that was written wrong. the maf is from street and performance. the intake manifold is professional products. Is there a better os i should start with?

[TonyArme]

13376

[Taz]

The tune you posted is a slightly modified 2000 Camaro LS1 5.7L 4L60 tune.

Are you using a 4L60 transmission ?

Is your wiring harness pinned for a Camaro or a Truck calibration ?

Are you using the 2000 6.0L truck injectors ?

Are you using the 2000 6.0L truck MAF (5 pin) ?


Regards,
Taz

[TonyArme]

using 4l60 trans

i believe the harness is for a truck. not sure how you tell. it has the correct harness for the maf (5pin) and no oil pressure sensor.

the injectors are corvette ls1

the maf is a 5 pin not sure if its a truck or not.

[Taz]

... i believe the harness is for a truck. not sure how you tell ...

How you tell is to get the PCM pinouts for both a 1999 to 2002 Camaro and a 1999 to 2002 Truck. Then look for any differences in the pinouts. If there are differences locate that component (for purposes of example - the oxygen sensor output) - then use a digital multimeter to confirm the output wire goes to the desired PCM pin.

There may not be any significant differences - don't recall - generally use truck harnesses.

Once you have eliminated any wiring issues (component mis-pinned etc) - then you can move on to troubleshooting the tune itself.

I check every pin and every wire of any harness I didn't build myself.


Regards,
Taz

[TonyArme]

where can i find the pin out diagrams

thank you so much for the help so far.

[TonyArme]

ok found pin out diagrams and checked them and everything seems to be good. red and blue connectors on the ecm and appers to be a truck harness. now i need to trouble shoot the tune. runs great with the maf unhooked but as soon as you plug itin it starts chugging and puffing out black smoke then dies. I've tried to datalog and adjust the hz of the maf but it made no difference. the injector flow rate is correct for the size injectors. everything looks good just goods bad once the maf is plugged back in

[joecar]

What FPR do you have (manifold-referenced or un-referenced)...?

[slows10]

If you have confirmed that the wiring harness and pinouts are good, and know the answer to joecars question above, it is time to post a log.

[TonyArme]

areomotive. unreferenced. set at 58psi

[TonyArme]

13379
13378
here is a datalog at idle and the tune. CL has been shut off in this log

[Taz]

OK .. looks like you got it to idle with the MAF connected. In future logs please add these PIDs:

GM.CYLAIR_DMA
GM.DYNCYLAIR_DMA
GM.DYNAIR


Just to clarify - are you using a returnless style fuel system (no fuel rail mounted fuel pressure regulator) ?


Regards,
Taz

[TonyArme]

ok i'll add those to a log a post another one tomorrow. it is a return setup it has aftermarket rails and a regulator mounted on the firewall

[Taz]

Sorry ... my fuel rail question was a little vague. I take it you have a fuel feed line going to the regulator and a fuel return line from the regulator - do you have a single fuel line (feed) going to the fuel rails - or two lines to the fuel rails (feed & return).

Also, just to confirm - you mentioned using LS1 fuel injectors. These will have a square type connector with a metal retaining clip. Trucks used a Multec connector - small with a plastic retainer.

Trying to get enough accurate information to help figure out what is wrong ...


Regards,
Taz

[TonyArme]

13380
square type ev1 injectors with metal clip. two lines, feed goes in to the rail circles around to the regulator then returns to the tank

[BLK02WS6]

Can you get a hold of another MAF to try on it? I think that is the problem judging from the way the signal is going crazy - in the couple spots where it levels out where it should be, the AFR, and IDC follow suit... then it starts occilating again...

[TonyArme]

thats kinda how it seems and i'm starting to lean towards a mechaincal problem because some times it runs ok and others it horrible and sometimes it wont run at all but if you unplug the maf it idles perfect every time

[TonyArme]

changed the maf with a spare laying around this morning a that was it. runs great now. its actually driveable so i can tweak the maf curve and timing and get this this running right. thank you so much guys for your help. such a simple thing i should of tried a long time ago. BRand new stuff isn't alway good

[BLK02WS6]

Glad you got it straight!