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Jeep Wrangler YJ
YJ General Discussion
Cold start problem on 92 2.5
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<blockquote data-quote="deadpool1" data-source="post: 440365" data-attributes="member: 21229"><p>so no spark tune at 60kmiles? (all words posted is car parked outside , first start cold?)</p><p>32F it starts up slow.</p><p>so is the starer spinning too slow, is the battery voltage below 11vdc cranking cold? hummmmm</p><p>yes the block heater warms up all that, including the 4 injectors and fuel through them and cold fuel does not like to burn. (for sure if tank is full of summer fuel.) (fill up the tank with winter fuel. top off?)<< the makers of fuel adjust it for cold)</p><p>The pressure is good so it is not fuel pressure</p><p>the block heater also makes cylinder compression higher, and less friction with cranking, too. ( and sure the starter spins faster for sure old tied batteries)</p><p>for sure.</p><p>check compression?</p><p>the IAC likes to gunk up and stick so if stuck closed how can the engine start with no AIR inducted, so clean that first.</p><p>To make sure the IAC is not bad learn to crank with 5% throttle foot. just tiny bit. and if it starts fast , it needed AIR,.</p><p>Load test the battery yet>? if it is old and weak then it cranks slower cold , as the all do old.</p><ul> <li data-xf-list-type="ul">good spark</li> <li data-xf-list-type="ul">good battery (check voltage cranking) if fails cold try jumper cables see if this simple tests proves the case, simple no?</li> <li data-xf-list-type="ul">good compression. (tested WOT) x4</li> <li data-xf-list-type="ul">good fuel , not summer grade. (some additives can help) try Techron injectors cleaner in tank. ( i never do snake oil but this is good)</li> <li data-xf-list-type="ul">try 5w-30 oil?</li> <li data-xf-list-type="ul">IAC on the TB, must work for sure cranking and idling. (needs air or fails)</li> <li data-xf-list-type="ul">key on fuel pressure at spec, (and is)</li> <li data-xf-list-type="ul">the ECT must read 300 ohms hot, does it? and cold it reads at 32f (0C) - 5800 ohms( sensor unplugged)! if reads wrong injection rates WRONG.</li> <li data-xf-list-type="ul">the IAT reads same as ECT first start if intake man. at 30F overnight they equalize. see?</li> </ul><p></p><p>ect chart I made the hard way from data from SMP sensor maker USA.</p><p></p><p>oops wrong chart</p><p></p><p>[ATTACH=full]122205[/ATTACH]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 440365, member: 21229"] so no spark tune at 60kmiles? (all words posted is car parked outside , first start cold?) 32F it starts up slow. so is the starer spinning too slow, is the battery voltage below 11vdc cranking cold? hummmmm yes the block heater warms up all that, including the 4 injectors and fuel through them and cold fuel does not like to burn. (for sure if tank is full of summer fuel.) (fill up the tank with winter fuel. top off?)<< the makers of fuel adjust it for cold) The pressure is good so it is not fuel pressure the block heater also makes cylinder compression higher, and less friction with cranking, too. ( and sure the starter spins faster for sure old tied batteries) for sure. check compression? the IAC likes to gunk up and stick so if stuck closed how can the engine start with no AIR inducted, so clean that first. To make sure the IAC is not bad learn to crank with 5% throttle foot. just tiny bit. and if it starts fast , it needed AIR,. Load test the battery yet>? if it is old and weak then it cranks slower cold , as the all do old. [LIST] [*]good spark [*]good battery (check voltage cranking) if fails cold try jumper cables see if this simple tests proves the case, simple no? [*]good compression. (tested WOT) x4 [*]good fuel , not summer grade. (some additives can help) try Techron injectors cleaner in tank. ( i never do snake oil but this is good) [*]try 5w-30 oil? [*]IAC on the TB, must work for sure cranking and idling. (needs air or fails) [*]key on fuel pressure at spec, (and is) [*]the ECT must read 300 ohms hot, does it? and cold it reads at 32f (0C) - 5800 ohms( sensor unplugged)! if reads wrong injection rates WRONG. [*]the IAT reads same as ECT first start if intake man. at 30F overnight they equalize. see? [/LIST] ect chart I made the hard way from data from SMP sensor maker USA. oops wrong chart [ATTACH=full]122205[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Cold start problem on 92 2.5
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