Found a $300 92' 740 w/ 280k miles. About three weeks ago I drove it home and then it sit, last night I went out to start it and it'll just crank over. I checked the fuel relay behind the ashtray along with some other fuses (fuel pump relay clicks as it should w/ key turned to Pos II), sounds like the in-tank pump is working (can smell gas after cranking), also noticed the RPM guage wasnt working, I cant recall if the tach was working or not when I bought it. Could the CPS have failed? I'm almost positive it could be the crankshaft position sensor giving me issues, but I also read about the radio suppression relay having problems. I located the RSR near my coolant reservoir and the 4 pins look real corroded, I also read about swapping the fan relay in place of the RSR which I might try tonight. Any ideas would be real helpful! Thanks.

Corroded RSR

 

Switch the RSR, change the Crank sensor, you are on the right track...

 

 

Will do, I'll update once its replaced

 

 

Get a good OEM CPS, it's a critical part.

 

It was the CPS, runs good now.

Needs better wheels and some low

 

What else would cause the tachometer to quit moving? I've replaced the crank position sensor twice, and let it sit for 6 days now. Will not start now. Rsr is also newer.

 

lack of power at pin 15 on the coil (I think its a blue wire?)? disconnected red/white wires at pin 1 on the coil?

 

are you talking about the wires that plug into the ignition amplifier next to the coil?

 

Pump is getting no power when cranking