MancheKid86 Posted December 18, 2014 Posted December 18, 2014 Things I have swapped Cps Fuel pumps+sending units Fuel pump resistor Spark plug wires Coil Ignition control unit Facts Tested good cps installed ,fuel delivery+fuel pressure good 12v to the ICU No power on coil tower output - new coil installed + 2 other know. Good coils Is there a way to test the cps harness to the ecu? Or what else can I try?
big66440 Posted December 18, 2014 Posted December 18, 2014 Are you getting a good spark at the spark plugs? do you have compression? as far as testing the CPS signal to the ECM you will need a wiring diagram and back probe the " return" A/C signal from the CPS to the ECM at the ECM connection. Then you can see if you have a 4.5 to 5 volt reference to the CPS at the CPS connection ( sorry I don't have the wire color/locations for this) IIRC there was a campaign/recall that bypassed the fuel injection harness and connected the CPS directly to the ECM for a cleaner signal, I did this on my Comanche and it was very quick and easy,if you plan on doing this make sure you use a grommet to run the wires through the firewall and a good water proof connection.
MancheKid86 Posted December 20, 2014 Author Posted December 20, 2014 No spark, New icm and coil and wires plugs are good perfect color and no fouling 12v dc to icm Tested cps, .5 acv output and 190 ohms resistance Pulled ecu tested cps input and had .5 acv to ecu What else will create a no spark?
MancheKid86 Posted December 21, 2014 Author Posted December 21, 2014 Adjusted the icm contacts and gained spark, Would fire up on wd40 and continue running afterwards Ecu checked out Vice grips on fuel return line and she fired right up Upgrading to 49 psi FPR as a fix
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