Trying to start my Mopar. Almost there need some help.

[jleilich]

Hello everyone.

I'm almost there with this thing. First ill tell you what i'm doing.
It's a 440CI, in a cuda. I'm using MS3x on a 3.57 pre-assembled board. I didn't touch the board at all its exactly how I bought it. The engine itself is a fairly stout motor. Edelbrock, heads, 520 hyd cam, KB pistons at around 10:1 compression, so pump gas.

I've got a COP set up with the LS2 D585 coils with the heat sinks. Cam sensor is the jeep 4.0L with an adapter. 36-1 crank wheel. Ford Ev14 injectors, edlebrock proflo xt manifold and an LS style TB with a GM TB Sensor and IAC. O2 is 14point7 brand drivers with the bosch 4.9 sensors

So here's whats going on. I put the ignition together first a few months ago and ran it on the carb just to make sure my ign was good before I messed with fuel. I've since completed the build and am now trying to start the car with no luck. I have good fuel pressure, my coils are working, I know this because i've tested them, and if I spray starting fluid in the manifold the car will start and burn the fluid and then die. I can run test mode on my injectors and hear them click. I have even ran the fuel pump, cycled the injectors to put fuel in the chambers and attempted to start the car with no luck.

attached is my MSQ file and a log of my trying to start it. Any help would be greatly appreciated. also know that my skill level here with this is low. Doing what I can but you may need to explain things like i'm a 5 yr old.

[grom_e30]

something is up with your map sensor its reading about 13kpa all the time so thats wrong and needs sorting but it wont stop it firing up. you prob need more cranking fuel p/w to get the car to catch at 60f my car wants (300%) nearly 3x the cranking pw than you are using.

[jsmcortina]

MAP sensor installed upside down? The printing and non-rounded side of the sensor needs to be facing you.

James

[whittlebeast]

Make sure your injectors are really spraying fuel. I had a set that 3 of the 4 went bad on the shelf. I found it with the injector test mode. Be careful, you can really spray a lot of fuel with the too many cycles. Taking them to an injector cleaning place may be safer.

Andy

[jleilich]

On the map sensor,

could be, ill check the wiring. Its a 1 bar GM style sensor.

I ordered another set of injector just to see if thats the problem. Its not getting fuel for some reason

[jleilich]

Thought I'd include a pic just so you all can see what i'm up too.

[whittlebeast]

Very cool.

Here is a real Hemi Cuda I did years ago.

http://www.nbs-stl.com/v8efi/Hemi022.jpg

[jleilich]

That's a crazy looking set up. I like it

[jleilich]

MAP sensor installed upside down? The printing and non-rounded side of the sensor needs to be facing you.

James

This could be possible. But even if the map wasnt installed at all I should at least get an attempt to fire right? some sort of sputter or spat.??

do you have a diagram of the GM 1 bar wiring?

[jleilich]

So I've made a bit of progress. Ive sorted out the MAP sensor and now I figured out that if I run test mode on the injectors and spray some fuel in 4 or 5 cylinders it will try and start. Still wont attempt to start with out artificially injecting fuel but I know my injectors are physically good, just need to find out why they dont spray when cranking.

here is an updated log and msg

[grom_e30]

did you up the cranking p/w % my car needs a lot more that 100% at 60f it wants about 300%

edit: map sensor still looks suspect.

[jleilich]

did you up the cranking p/w % my car needs a lot more that 100% at 60f it wants about 300%

edit: map sensor still looks suspect.

Ill turn it up, what do you mean about the MAP sensor?

[slow_hemi6]

Map sensor is reporting full scale for sections during crank (full scale 0v is 10kpa with your calibration). I have a 10.8:1 SBM with 70 degrees o/lap, not a chance it could pull 10kpa at crank rpm and have enough air to start.

[jleilich]

Map sensor is reporting full scale for sections during crank (full scale 0v is 10kpa with your calibration). I have a 10.8:1 SBM with 70 degrees o/lap, not a chance it could pull 10kpa at crank rpm and have enough air to start.

any idea what would be causing this? So here is what I did. I went from "voltage" to "Frequency" in tunerstudio on the general settings for MAP. Once I did that the gauge started working. It was stuck at 13kpa before and not moving.

[grom_e30]

is it a gm 1 bar sensor? how is it wired to the ecu?

[slow_hemi6]

The only frequency MAP I know of is Ford. I can't think of any GM 1 bar that is frequency.

[jleilich]

This is the one i'm using. Duralast SU1078

http://www.amazon.com/Wells-SU1078-Mani ... B0026N54XM

[grom_e30]

http://www.wellsve.com/custom_searches/ ... tno=SU1078 is yours wired like this?

[jleilich]

http://www.wellsve.com/custom_searches/ ... tno=SU1078 is yours wired like this?

Yes, I checked it a few times. Its grounded to the MS

[grom_e30]

and you are powering it off the tps vref? what voltage do you measure on the signal pin? what pin is connected to the signal?