#4 injector not firing HELP!
Thread Starter
Joined: Sep 2002
Posts: 33
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From: mesa, az, usa
#4 injector not firing HELP!
I just rewired the front of the car and now i think my number 4 cylinder isnt working. after like 40 seconds of operating the number 4 header pipe was cold and 3,2,and 1 were warm. spark plug was dry and didnt smell like fuel.
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Joined: Dec 2001
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Re: #4 injector not firing HELP! (ALLmotorCRX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALLmotorCRX »</TD></TR><TR><TD CLASS="quote">I just rewired the front of the car and now i think my number 4 cylinder isnt working. </TD></TR></TABLE>
Re-check your work. You missed one or more connections.
With ignition on, engine not runnung, you should measure 12 volts at both pins of the injector. If not, check back towards the injector resistors. If you only get 12 volts at one pin, the injector coil is open.
If things check out this far, briefly ground the injector pin that's on the ECU side. The injector should click. (The injectors receive a constant 12 volts and the ECU completes the circuit to ground to trigger the injectors.)
Re-check your work. You missed one or more connections.
With ignition on, engine not runnung, you should measure 12 volts at both pins of the injector. If not, check back towards the injector resistors. If you only get 12 volts at one pin, the injector coil is open.
If things check out this far, briefly ground the injector pin that's on the ECU side. The injector should click. (The injectors receive a constant 12 volts and the ECU completes the circuit to ground to trigger the injectors.)
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