No start, tach won't move

[slammed83mazda]

Is my PCM gone? Don't know if any of you have kep up with my most recent problem. But I got it posted in this section as well.

[erics diesel]

I would try a new cps first

[ZMANN]

Me also

I thought that was "SOP" on a 7.3 LOL

[Marcos N. Martinez]

have the same problem on my 96 7.3 it cranks but does not start. change the cps and nothing

[madpogue]

To the OP and the hijacker - are you getting a WTS light?

[slammed83mazda]

IM getting a wait to start light, replaced CPS going to try it in the morning.

[slammed83mazda]

Finally got enough juice to try to crank the truck. Hooked up mu cheap super chips scanner and got p0344 and p1661. I did just replace the CPS but whose to say the new one isnt bad and my old ones good.

What would trip a 1661 code? The truck has been having a rough idle on a cold start, and I mean rough before it died it would sound like a miss then slowly die on its own. It would take about 20 cranks to get it running again. IF I plugged the truck in over night, I get none of these problems.

Now the trucks sitting dead in my driveway, yet I have it up for sale with people wanting to buy it lol.

[BigFuel]

Output Circuit Check is low. Hopefully it's the weak batteries. With the key in the "run" position pull the connector off the MAP sensor. Using a DVOM see if one of the female pins is suppling 5v reference.

-Yes? Reconnect and move to the EBPS and do the same thing.

-No? Check all under hood fuses and test again. Still no? Possible popped PCM.

[slammed83mazda]

Update on truck, still won't start.

No smoke out exhaust
Tach bounces when cranking
Wait to start light comes on like normal.
Cranks great with good voltage.

Got a buddy with a spare IDM and PCM, but I am leaning towards the IDM since my rpm and everything else is working.

[slammed83mazda]

update, swapped a good idm/pcm into the truck still no start.