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Jeep Wrangler YJ
YJ General Discussion
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<blockquote data-quote="deadpool1" data-source="post: 439556" data-attributes="member: 21229"><p><strong>please show real numbers</strong>, RPM and real volts. it matters huge.</p><p></p><p>ok , what matters here is , did engine really slow down, or just the tacho did?,I guess both. felt ,seen and heard.</p><p>and what were the 2 RPM's that dipped, from what to what.?</p><p>and what was your right foot doing at the dip? steady?</p><p>The VM (it's not an ammeter at all)it is volts on dash can dip for only these reasons.below.</p><p>alternator is bad. (or 1 battery cell shorts then un-shorts, yes they can . (the REG in the ALT does not want to blow up bad batteries,)_</p><p>engine rpm when below 500rpm and alternator went off line? it sure will. (exact RPM is at the makers data sheet of said alt )</p><p>bad wiring,.(the exact RPp DROP is not known. but is hear 500e engine or 1500rpm on gen pully/</p><p></p><p>can I assume the<strong> hesitation never happens at just a steady cruise speed</strong> , right foot not moving just steady, <strong><em> love to know that fact.</em></strong></p><p><strong><em>can I assume RPM never drops below 800 RPM</em></strong></p><p>the VM in the dash sure can drop to 14v , not lower at any time,. as the ALT REG dictates unless RPM fails)_</p><p>keep in mind the ALT pulley spins way faster than the crank 4:1 speed ratio, possible. ours is 2.8!</p><p> so the ALT works at any normal ENGINE RPM, in fact.</p><p>this car is 7 div by 2.5 = 2.8:1 ratio crank to gen ratio.</p><p></p><p>here is a GM alternator graphic (data sheet)_</p><p></p><p>shows what the ALT does, RPM is only the ALT pulley RPM not the engine</p><p>so</p><p>I can <strong>not</strong> see your TACH so can not know if this rule below is occuring , low hot engine RPM is 800, never less. so that matters first.</p><p>800 x2.8 ratio is 2240 rpm gen. I do not have jeep data sheets on gens, for sure replaced later as all have been..</p><p>as you can see 1000 - 2000 rpm is the BAD zone of unknown, 500 engine RPM is stuck open <strong>EGR</strong>> and is bad.(rpm and it)</p><p></p><p>[ATTACH=full]121836[/ATTACH]</p><p>I can not not drive your car and see , hear and feel any of this.</p><p>can't see MPH/ RPM,VOlts or right foot actions/. ( please tell exact RPMs first) real; data wins in diagnosis.</p><p>nor if hesitation can be demonstrated parked , in neutral.????? with wild throttle actions.?</p><p>not saying I know what is wrong</p><p>and we all know one wire somewhere is loose. (the endless story)</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439556, member: 21229"] [B]please show real numbers[/B], RPM and real volts. it matters huge. ok , what matters here is , did engine really slow down, or just the tacho did?,I guess both. felt ,seen and heard. and what were the 2 RPM's that dipped, from what to what.? and what was your right foot doing at the dip? steady? The VM (it's not an ammeter at all)it is volts on dash can dip for only these reasons.below. alternator is bad. (or 1 battery cell shorts then un-shorts, yes they can . (the REG in the ALT does not want to blow up bad batteries,)_ engine rpm when below 500rpm and alternator went off line? it sure will. (exact RPM is at the makers data sheet of said alt ) bad wiring,.(the exact RPp DROP is not known. but is hear 500e engine or 1500rpm on gen pully/ can I assume the[B] hesitation never happens at just a steady cruise speed[/B] , right foot not moving just steady, [B][I] love to know that fact. can I assume RPM never drops below 800 RPM[/I][/B] the VM in the dash sure can drop to 14v , not lower at any time,. as the ALT REG dictates unless RPM fails)_ keep in mind the ALT pulley spins way faster than the crank 4:1 speed ratio, possible. ours is 2.8! so the ALT works at any normal ENGINE RPM, in fact. this car is 7 div by 2.5 = 2.8:1 ratio crank to gen ratio. here is a GM alternator graphic (data sheet)_ shows what the ALT does, RPM is only the ALT pulley RPM not the engine so I can [B]not[/B] see your TACH so can not know if this rule below is occuring , low hot engine RPM is 800, never less. so that matters first. 800 x2.8 ratio is 2240 rpm gen. I do not have jeep data sheets on gens, for sure replaced later as all have been.. as you can see 1000 - 2000 rpm is the BAD zone of unknown, 500 engine RPM is stuck open [B]EGR[/B]> and is bad.(rpm and it) [ATTACH type="full"]121836[/ATTACH] I can not not drive your car and see , hear and feel any of this. can't see MPH/ RPM,VOlts or right foot actions/. ( please tell exact RPMs first) real; data wins in diagnosis. nor if hesitation can be demonstrated parked , in neutral.????? with wild throttle actions.? not saying I know what is wrong and we all know one wire somewhere is loose. (the endless story) [/QUOTE]
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Jeep Wrangler YJ
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