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Old 03-20-2011, 04:24 PM   #1
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Default Bad CPS???

What are the symptons of a bad cps...my xj starts when it wants to stalls for what seems like no reason and stalls sometimes at idlle
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Old 03-20-2011, 04:35 PM   #2
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cps is a def. possibility. any other symptoms? does it do it when driving? could be your o2 sensors. get it on a computer and see if there are any codes in there that have stored but not tripped the CEL. has it had a tune up lately; plugs, wires, cap, rotor, etc?
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Old 03-20-2011, 04:38 PM   #3
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Many times when a crank position sensor starts going bad it will make your rig crank, and crank, and crank but no start. Crwal under there and see if the two bolts have loosened up. If those are tight, you can loosen them and re-seat your cps and see if that helps, they tend to wear slightly and at times it can be enough where you have to "adjust" them.

You can perform a conntinuity (I know, very bad spelling) test with a meter. It should show an open circuit. If its closed then its bad.

With stalling issues check out you IAC (idle air control) they can go bad and cause stalling issues, also they get very dirty after awhile (carbon and gunk). Take it out and clean it and place it back in, reset the comp and see if that helps. I forget right now (im at work and away from my FSM) what meter test you do on it, but try cleaning the IAC.
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Old 03-20-2011, 07:52 PM   #4
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I have new plugs wires iac tps map sensor new injectors still wants to stall
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Old 03-20-2011, 08:07 PM   #5
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do a fuel pressure test to see where you stand, but its sounding like it may be fuel related (fuel pump). Did you make sure your timeing was on the money? I know simple questions but its the small things we tend to miss.
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