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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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<blockquote data-quote="deadpool1" data-source="post: 439461" data-attributes="member: 21229"><p>well steady right foot has zero to do with TPS and zero to do with ISA, (if not bad ISA and it is trying to move the throttle as you drive fast, OUCH !)</p><p>it is not tip in hesitation (tps dead) (aka, just off idle hesitation)</p><p>it is not fast right foot, cruising fast, and the you moving right foot for more speed, hesitation. ( TPS does this for seconds only,, fast enrich mode)</p><p></p><p>so is is lean burn cruise failure. only. right foot at 1400 3rd gear. (injection rate is dead wrong) <strong>try unplugging O2 sensor yet and drive.</strong></p><p>so that begs the question , you did not answer my WOT questions, on power to the road, in all gears 1 to 4.</p><p></p><p>my guess now, is simple lean out. (dynamic on the fly driving fast lean out)</p><p>running lean </p><p>I have remote fuel pressure gauges in my shop to find , this. Like i said a weak fuel pump or wires to it rusty , </p><p></p><p>the TBI has test port for pressure, 14-15psi calibrate what if 14psi is 10 moving fast.</p><p>if not 14, moving fast that means the FPR <strong>lost control </strong>due to a weak fuel pump.</p><p>filter is new so not that.</p><p>weak pumps happen many times for sure this old car, is bad wiring to the pump (rusty) harness pins, all. or the ground to the pump bad.</p><p>11vdc minimum to actual pump is my low spec I ALLOW.</p><p></p><p>11vdc is cranking voltage. so I expect at least that.</p><p>most cars are near 14vdc running so pump sees 13vdc then at pump. (cheap wires on cars love to drop 1volt to pump but is ok)</p><p>I have remote reading, DMM to find things that fail like this. (DC power failures)</p><p>a new pump does not cure bad wiring ever.</p><p></p><p>the old PCMs like this were horrible with 02 controls. (had too much .)</p><p>classic failures were back then, were this.</p><p><strong>exhaust leak any where near that 02 sensor, sucks in 20 % oxygen</strong> from earths atmosphere, called air.</p><p></p><p>20% air landed there, causes 02 to real hard lean. to 0vdc output</p><p>and EFI goes hard hard lean.</p><p></p><p>cranked, exh manifold</p><p>missing or bad exh. header donut ring gasket sucking air.</p><p>cracked header pipe cat, there must be no cracks there.</p><p></p><p>also if vacuum gauge bounces at idle. that can be sticking intake valve and misfiring, (I cant hear your engine)_</p><p>and each misfire this gross sends a slug of air to the exhaust.</p><p>or a burned up head valve.</p><p></p><p>folks forget how exhaust works</p><p>here it is. the Exh pressure wave</p><p><span style="color: rgb(184, 49, 47)">see B?</span> that is vacuum in the pipe, real., and if cracked, it does SUCK air. and fails hard.</p><p>[ATTACH=full]121801[/ATTACH]</p><p></p><p>one way to find leaks</p><p>is rubber hose to your ear</p><p>and moved end of hose, over all exhaust parts up to the cat, head to cat, for PUTT PUTT sound in the hose to ear, bingo leaking</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439461, member: 21229"] well steady right foot has zero to do with TPS and zero to do with ISA, (if not bad ISA and it is trying to move the throttle as you drive fast, OUCH !) it is not tip in hesitation (tps dead) (aka, just off idle hesitation) it is not fast right foot, cruising fast, and the you moving right foot for more speed, hesitation. ( TPS does this for seconds only,, fast enrich mode) so is is lean burn cruise failure. only. right foot at 1400 3rd gear. (injection rate is dead wrong) [B]try unplugging O2 sensor yet and drive.[/B] so that begs the question , you did not answer my WOT questions, on power to the road, in all gears 1 to 4. my guess now, is simple lean out. (dynamic on the fly driving fast lean out) running lean I have remote fuel pressure gauges in my shop to find , this. Like i said a weak fuel pump or wires to it rusty , the TBI has test port for pressure, 14-15psi calibrate what if 14psi is 10 moving fast. if not 14, moving fast that means the FPR [B]lost control [/B]due to a weak fuel pump. filter is new so not that. weak pumps happen many times for sure this old car, is bad wiring to the pump (rusty) harness pins, all. or the ground to the pump bad. 11vdc minimum to actual pump is my low spec I ALLOW. 11vdc is cranking voltage. so I expect at least that. most cars are near 14vdc running so pump sees 13vdc then at pump. (cheap wires on cars love to drop 1volt to pump but is ok) I have remote reading, DMM to find things that fail like this. (DC power failures) a new pump does not cure bad wiring ever. the old PCMs like this were horrible with 02 controls. (had too much .) classic failures were back then, were this. [B]exhaust leak any where near that 02 sensor, sucks in 20 % oxygen[/B] from earths atmosphere, called air. 20% air landed there, causes 02 to real hard lean. to 0vdc output and EFI goes hard hard lean. cranked, exh manifold missing or bad exh. header donut ring gasket sucking air. cracked header pipe cat, there must be no cracks there. also if vacuum gauge bounces at idle. that can be sticking intake valve and misfiring, (I cant hear your engine)_ and each misfire this gross sends a slug of air to the exhaust. or a burned up head valve. folks forget how exhaust works here it is. the Exh pressure wave [COLOR=rgb(184, 49, 47)]see B?[/COLOR] that is vacuum in the pipe, real., and if cracked, it does SUCK air. and fails hard. [ATTACH type="full"]121801[/ATTACH] one way to find leaks is rubber hose to your ear and moved end of hose, over all exhaust parts up to the cat, head to cat, for PUTT PUTT sound in the hose to ear, bingo leaking [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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