akauf Posted February 26, 2012 Report Share Posted February 26, 2012 So since last weekend the starion has been cutting out briefly for some reason. I have a wide band and as the car dies for a moment the gauge displays dashes aka completely lean, no fuel at all. fuel is cutting out for less than a second in most cases and I haven't identified any patterns of it having to do with the car being warmed up or not, rpms, vac, boost or throttle position. However, I'm going to contradict myself a bit here, it doesn't do it at idle and at times under full boost it wont have this issue. Could be a fluke but it definitely doesn't do it at idle. as quickly as it cuts in and out I'm fairly certain its the injectors shutting on and off for some reason. If it were the fuel pump or a clog limiting pressure at times I feel it would be running leaner or going lean more gradually where it is more like a switch. Also when it cuts out for longer periods of time my tach is not dropping quickly or jumping around so I believe the signal is fine and it is not related to the pick up in the dist. Could be wrong though Any thoughts or similar experiences? Link to comment Share on other sites More sharing options...
akauf Posted February 28, 2012 Author Report Share Posted February 28, 2012 off, on off, off on. this is driving me crazy!!!! the car tends to take a long time to shut off injectors on deceleration if they shut off at all.... Link to comment Share on other sites More sharing options...
akauf Posted February 28, 2012 Author Report Share Posted February 28, 2012 checking the resistor pack in the morning. Link to comment Share on other sites More sharing options...
StarquestRescue Posted February 28, 2012 Report Share Posted February 28, 2012 Try disconnecting the isc motor plug and see it acts any different. Link to comment Share on other sites More sharing options...
akauf Posted February 28, 2012 Author Report Share Posted February 28, 2012 the wires to the isc were pulled out of the harness.two were still connected but exposed, another was ripped out and shorting. Link to comment Share on other sites More sharing options...
StarquestRescue Posted February 29, 2012 Report Share Posted February 29, 2012 (edited) Watch the video on post 8. If the ics idle switch is stuck in the closed throttle position, or the wire is shorted to ground the ecu will cut the fuel off under some conditions. The idle switch wire is in the rear plug that goes to the isc motor. http://www.starquest...1 Edit, crap, bad video link. Edited February 29, 2012 by StarquestRescue Link to comment Share on other sites More sharing options...
Indiana Posted February 29, 2012 Report Share Posted February 29, 2012 What year is your car? If boost is too high that's normal for for 83-86 fuel systems. It could also be signs of a dirty ECI fuse link. Vibrations are causing intermittent connection and no power to the ECU will cause a pump shut down. Link to comment Share on other sites More sharing options...
akauf Posted February 29, 2012 Author Report Share Posted February 29, 2012 not sure which wire is disconnected but it was either the idle switch wire broken and shorting against the exposed isc motor wire or vise versa. I'll have to re-wire it here soon. between this and my temp sensor wire breaking off in a similiar fashion my cold start is pretty crappy. Still didnt expect tose wires to just pop out like that. I tested the ics and inspected that wiring within the year and it didnt look that fragile then. Link to comment Share on other sites More sharing options...
Indiana Posted February 29, 2012 Report Share Posted February 29, 2012 After the hardened insulation cracks, vibrations from the engine running causes the wires to break the strands pretty quick. Link to comment Share on other sites More sharing options...
Recommended Posts