Completed atx to mtx conversion, but have starting problems please help??

[SHOspeed93]

I just finished the conversion but the car will not start, it has fuel, and spark but it wont crank over, Im lost and I need to drive this thing already...thanks

ATTN::: rktmn (jose) you had sent me the wiring diagram that you made and thats the one that I used, is there anything you might think of that would cause this problem..thanks

 

[qiksho]

Check the simple things...do you have power to the starter?

 

[SHOspeed93]

the starter works, I think that im might not be getting an injector pulse

 

[Devin]

Is the starter turning over?

 

[qiksho]

SHOspeed93:
I just finished the conversion but the car will not start, it has fuel, and spark but it wont crank over, Im lost and I need to drive this thing already...thanks

You say it won't crank over - if thats the case its not an injector. Its in the ignition/starter circuit somewhere. If it cranks but won't start then its a diferent story.

 

[AutoSHO]

Lets use some standard terminology:

Not turning over/ Not Cranking = The engine is not being spun by the starter.

Not starting = Engine is not running under its own power.

Which is it? Sounds like the engine is turning over, but not starting.

Are you using the ATX or MTX computer? If it is the MTX computer, you needed to change the whole engine wiring harness, as everything is on different pins from the MTX computer.

If you kept the ATX harness on, you should be able to plug in the ATX computer and get it to start. I cannot promise it will run well, and you will get lots of codes, but it should start and run.

 

[SHOspeed93]

It cranks but wont start.....sorry about that, it turns out the injectors arent pulsing, there is spark, the fuel pump turns on, but the injectors wont pulse....The engine compartment has everything mtx in it except for the injector harness( but I just changed that to the mtx one), it has the mtx comp in it and all of the wiring...I will try again tommorow after I put the intake back on

 

[RStalveyARFF]

Check the TPS. If it senses full throttle while cranking it will not fire the injectors...

 

[ghostrider]

Also check ALL of your grounds. When a buddy of mine did his atx to mtx swap he couldn't start his either. Two of his grounds weren't that good. The strap on the rear of the intake that attaches to the a bolt. Its the one right underneath the bg wiring loom on the passenger side. That ground wasn't tight. And then his DIS wasn't fully grounded. He only had 2 screws in it. Put in the other two screws, and then tightened down the ground strap on the back of the intake, and it fired right up.

 

[SHOspeed93]

Ohk it turns out that I didnt have the ground on the ecu, so it started for about 5 seconds then shut off...now it dont start again, I dont know if I have that ground strap on the back of the intak hooked up, I didnt see it back there...I dunno where it went. I have injector pulse, fuel pressure, and spark, and it cranks but now it wont start....

 

[shozone]

O.K., now I know this is gonna sound stupid to y'all who do yer own work, but I have to drive this thing on a regular basis and don't have a back up car.... Is there anybody on the east coast who does the ATX to MTX transplant professionally? I'm starting to feel the wear in my ATX, and spending 2K for a new one, plus labor seems crazy if I can make the car into an MTX for close to the same cost. Any ideas????? Thanks