93XJ turning, not firing.
#1
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Join Date: Dec 2011
Location: Georgetown Texas
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Year: 1993
Model: Cherokee
Engine: 6 Cyl. 4.0L
93XJ turning, not firing.
93 Cherokee Sport--in line 6, 4.0L--automatic
Recent Engine swap. Nearly, everything is new in the engine chassis, just running into some annoying electrical issues.
The Jeep has started, and ran for a couple of minutes. Shut off, tried again, turns but won't fire. It did have a couple of "rough" starts after that great first start, only with foot flooring the pedal, and now it has drained the battery twice (cranking amps and all that).
What I have done.
Ohms on the CPS is good or a little high, forgive me I had it set so it read 31.2 ohms, but on a different scale it reads 312.
Have read that IAC valve can get stuck, messing up the air fuel mixture. It also has ohms reading, but was dirtier than hell, and am not sure exactly what it does in the throttle body (it was a hot mess, the O ring was also jammed on the lip, so that could of been an issue.
TPS has an ohms reading
Fuel pump does prime. And I have a new filter.
Any other reasons for why it would not get spark?
Thank you Jeep brothers for taking time to read this.
J out of Texas.
Recent Engine swap. Nearly, everything is new in the engine chassis, just running into some annoying electrical issues.
The Jeep has started, and ran for a couple of minutes. Shut off, tried again, turns but won't fire. It did have a couple of "rough" starts after that great first start, only with foot flooring the pedal, and now it has drained the battery twice (cranking amps and all that).
What I have done.
Ohms on the CPS is good or a little high, forgive me I had it set so it read 31.2 ohms, but on a different scale it reads 312.
Have read that IAC valve can get stuck, messing up the air fuel mixture. It also has ohms reading, but was dirtier than hell, and am not sure exactly what it does in the throttle body (it was a hot mess, the O ring was also jammed on the lip, so that could of been an issue.
TPS has an ohms reading
Fuel pump does prime. And I have a new filter.
Any other reasons for why it would not get spark?
Thank you Jeep brothers for taking time to read this.
J out of Texas.
#2
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Join Date: Dec 2008
Location: eaton ohio
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Year: 93
Model: Cherokee
Engine: 4.0
Cap rotor coil wires plugs firing order are all the injectors firing? Sounds more like a fuel issue to me. Could be bad gas. There are a bunch of things it could be
#4
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Location: Georgetown Texas
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Year: 1993
Model: Cherokee
Engine: 6 Cyl. 4.0L
AIC Valve was and is jammed. Ordered new AIC valve sensor, MAP, TPS, and CPS just to make sure. Will drain gas tank and put in new gas to ensure that gas is not an issue (because prior to this it has run, seems like a bad timing issue from the swap to start with these extra nuances)
Read my TSM of the electrical systems and will conduct a very thorough testing of all parts of the starting system.
Although I hope that is cured by the new AIC valve.
Read my TSM of the electrical systems and will conduct a very thorough testing of all parts of the starting system.
Although I hope that is cured by the new AIC valve.
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