88' Ranger cranks but wont start??

[n_grimm]

Here is a link to the the ecm diagnostics procedure. If the CEL doesn't work You can use a volt meter to read the codes but unless you have an analog unit, it may be hard to read. Using a test light to read them may put too much load on the ecm. Code readers with leds may not cost too much. The tech library also lists the codes. If it doesn't give any codes, maybe that would confirm the ecm as being the problem. It still may be worth reseating the connections on the ecm since you will need to remove it anyway if it is determined to be bad. I have fixed a lot of problems on cars (and computers as a electronics tech for 20 years) by cleaning connections, so that is always a good first step.

http://therangerstation.com/tech_library/OBD_I.html

 

[atvkid4eva]

ok well i think i narrowed it down to one thing..i used a node light to check for power to the injectors..when in the accessory position and when cranking over the light did not light up while being plugged into the injector connector..so i am NOT getting power to my injectors which is why it wont start...what would cause there to be no power to the injectors? a bad ground or a bad computer?

 

[kimcrwbr1]

The computer controls the ground to the injectors If you have power to the injectors with the key on run likely a bad ground to the computer or the computer itself. If you don`t get power to the injectors with the key on run then you need to trace the circuit for the injectors to the eec relay back to the battery. And the eec relay thru the ignition to the battery, a good schematic will help in tracing the circuits.

 

[atvkid4eva]

what about the crankshaft position sensor would it cause these symptoms?

 

[atvkid4eva]

well guys i got ir running! it turns out that the o2 sensor wire melted in the headers and one of the computer grounds runs into that plug therefore resulting in a lack of ground at the computer..i ran my own ground and everything works perfect now and it starts right up.my CEL even illuminates again! thanks everyone!