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Jeep Wrangler YJ
YJ General Discussion
Cold start problem on 92 2.5
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<blockquote data-quote="JohnOllen" data-source="post: 440331" data-attributes="member: 21339"><p>I‘ved searched on this “common problem” but haven’t found anything yet to lead me to the solution. Most solutions seem to point to a tired ECM. My YJ runs great, starts great when’s its warm outside, but once the temps start to drop to near freezing it takes its time, several cranks before it fires to life. Once it starts it runs great, and starts great again.The weird thing is if I plug the block heater when it sits out in the cold, it‘ll fire right up, even on the coldest morning. The only thing i would think the block heater should help is with keeping the oil warm and thinner, so the starter has less problem turning it over. It does turn over a bit slower in the cold but the battery is fine. Could it be the starter is just too old and tired to turn it over fast enough to fire in the cold? Seems to turn over well enough to me but like I said it is definitely a bit slower in the cold. </p><p>Other info:</p><p>- CEL lights up when key is turned to on, then turns off when engine starts. </p><p>- fuel pumps comes on with key going to on,</p><p>- fuel pressure in rail checked and found to be 29psi 24hours after it was shut down. </p><p>- Battery fully charged</p><p>- spark plugs cleaned</p><p>- intake air temperature sensor cleaned and verified working</p></blockquote><p></p>
[QUOTE="JohnOllen, post: 440331, member: 21339"] I‘ved searched on this “common problem” but haven’t found anything yet to lead me to the solution. Most solutions seem to point to a tired ECM. My YJ runs great, starts great when’s its warm outside, but once the temps start to drop to near freezing it takes its time, several cranks before it fires to life. Once it starts it runs great, and starts great again.The weird thing is if I plug the block heater when it sits out in the cold, it‘ll fire right up, even on the coldest morning. The only thing i would think the block heater should help is with keeping the oil warm and thinner, so the starter has less problem turning it over. It does turn over a bit slower in the cold but the battery is fine. Could it be the starter is just too old and tired to turn it over fast enough to fire in the cold? Seems to turn over well enough to me but like I said it is definitely a bit slower in the cold. Other info: - CEL lights up when key is turned to on, then turns off when engine starts. - fuel pumps comes on with key going to on, - fuel pressure in rail checked and found to be 29psi 24hours after it was shut down. - Battery fully charged - spark plugs cleaned - intake air temperature sensor cleaned and verified working [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Cold start problem on 92 2.5
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