95 Eclipse GSX troubles

[hendo0601]

Hi there. I am a professional mechanic and have run into a serious roadblock and really could use some help/ideas. My customer owns a 1995 Eclipse GSX with a few simple bolt on mods (cold air intake, boost controller, blowoff valve, exhaust). The car was recently stolen and whoever stole it drove the hell out of it and blew up the engine (timing belt) and ripped out the stereo and a whole lot of other wiring in the dash. I replaced the engine with a brand new crate motor and I reused all of the existing sensors. The engine will now crank but has no spark or injector pulse. I have chased down every possible sensor and have come up with nothing. The cam and crank sensors both show battery voltage on one pin, 5v reference on another, and ground on another. The VSS shows the same. I tested and retested the MPFI Relay and it is energizing. I ran a few tests on the PCM and I am not coming up with anything conclusive. At this point I have narrowed it down to either cam/crank sensors, MPFI Relay, and the PCM. As I said earlier when they ripped the stereo out they also ripped a bunch of other wiring out and I have no clue where it goes or what it was for so this may be a fool's errand. If anyone on here has any ideas it would be greatly appreciated.

 

[bryanwheat]

Make sure that you don't have the ac plug switched with the coil plug. They will plug into each other. Also i would go thru all that wiring before replacing anything.

 

[tony070804]

a bad crank angle sensor will affect it, also try checking the injector resistor pack on the fire wall.

 

[hendo0601]

the coil plug wont reach the AC compressor so that's not it, but just for GP I plugged the AC into the coil and still nothing, so Im sure that isnt it. I am checking the injector resistor pack now, and I am going to replace the crank sensor next. This car has been in my shop for a week and it's killing me.

 

[bryanwheat]

Check for power to the injector plugs. IF they all have power than the resistor pack is fine. Also the injector resistor pack has nothing to do with spark. Have you checked the ecu for codes after cranking it over? If it isn't throwing a code than i wouldn't just start replacing parts. There are ways to test the crank and cam sensors.

 

[hendo0601]

I have checked for codes and none are present. With my scan tool plugged in and reading live data while cranking it shows zero RPM. This is leading me to the crank sensor being faulty.

Also, everywhere I am reading tells me that the PCM supplies 8-9 volts to the cam, crank, and vehicle speed sensors through the PCM. I am getting battery voltage at all three. Is this normal?

okay so after some more testing and diagnostic work, I disconnected the bottom plug of the PCM and the voltage at the cam and crank sensors both dropped to 8.4 volts which tells me that there is a short inside the PCM. A lot of what I am reading on Identifix is telling me that PCM failure is rather common on these vehicles. Have any of you seen this before?