YJ spitting and sputtering randomly...HELP! - Page 2 - JeepForum.com
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post #16 of 21 Old 06-28-2018, 12:37 PM
bharris68
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Good deal!


remember - it's not the engine IS running too cool, it's the sensor sending a signal that the engine "APPEARS" to be too cool - big difference. Sensors are the menu, not the meal

I've not had issues with my temp sensors before so others may have a better idea exactly which ones are going to be sending that temp data to the computer. You may also be able to intercept the signal via the diagnostic ports next to the battery.

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post #17 of 21 Old 06-28-2018, 03:04 PM
Mr.B
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Quote:
Originally Posted by nolanhickson View Post
Success!!! Got the check engine light replaced (thanks to that useless seatbelt indicator light giving up its bulb) and got some codes.
It threw these codes at me:

21: oxygen sensor/circuit

24: throttle position sensor/circuit

17: engine running too cool



The 21 and 24 codes are child's play, I've replaced those parts before. Will replace them again, with hopefully some higher quality components.
But the 17 code....not sure on that one. The Jeep runs at around 200 or so degrees, why is that too cool?



I have a '95 FSM, powertrain manual, and parts catalog. Send me a PM with the ones you want, and I'll PM the links to you. They will really help you figure it out.

.
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post #18 of 21 Old 06-28-2018, 03:22 PM
Waternut
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Quote:
Originally Posted by nolanhickson View Post
Success!!! Got the check engine light replaced (thanks to that useless seatbelt indicator light giving up its bulb) and got some codes.
It threw these codes at me:

21: oxygen sensor/circuit

24: throttle position sensor/circuit

17: engine running too cool



The 21 and 24 codes are child's play, I've replaced those parts before. Will replace them again, with hopefully some higher quality components.
But the 17 code....not sure on that one. The Jeep runs at around 200 or so degrees, why is that too cool?
The temp sensor at the front of the engine is one that feeds the PCM. The one at the back of the engine feeds the temp gauge. That fix is even cheaper and easier than the other two.


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post #19 of 21 Old 06-28-2018, 05:53 PM
shaggyjim
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If you have a multimeter you should do some testing of your sensors before you replace them. One other thing to think about is going back to sensors from a Jeep dealer. They are better quality then the parts store parts.

Jim...

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post #20 of 21 Old 07-01-2018, 02:23 PM Thread Starter
nolanhickson
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I replaced the O2 sensor and the TPS, both of which seemed to help the Jeep run better overall. But, the issue persists (although not as bad!)

I guess the next step is to pull spark plugs, to see if I've got a bad injector?
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post #21 of 21 Old 07-02-2018, 09:56 PM
Mechman71
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When you pull your plugs, check also to see if one of the electrodes is cleaner than the others, and possibly lightly tinted green like your coolant. Given the progressive nature of this problem, my suspicion would be a head gasket failure that is going from minor to... well, not so minor.

'89 YJ "Night Eagle" 4.2 5spd, Spinnaker blue/grey, hard top and doors, mostly stock and RUST FREE!!
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