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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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<blockquote data-quote="deadpool1" data-source="post: 439562" data-attributes="member: 21229"><p><strong><em>90 yJ /m/t 2.5L</em></strong></p><p>now I see the throttle pedal <strong><em>was steady</em></strong> ! at 1400 up and engine power (hp) surges or cuts out or something, (high or low/)(CUTS LOW)</p><p>TPS can't do that (its new) THAT IS if not indexed wrong to its tabs. or the wires damaged (wires /pins damaged x3)</p><p>The TPS voltage must be steady at cruise, about 2vdc. not 0v ,not 5v, but at the voltage normal say for 2000 rpm. 2v and steady as you cruise.</p><p></p><p>what<strong> amp</strong> meter, ? none there stock.!~</p><p>I guess you meant dash center section, Voltmeter (IGN wire feed that is) drops?</p><p>Tachometer drops, from what to what RPM 800 is normal hot, ISA holds that RPM hot normal.</p><p>hear engine RPM drop too?, or only gauge seen to drop?></p><p>that's a tough one ,Grimiln's are. </p><p> </p><p>alternator is in spec, range and can change , as it wants, if it thinks battery needs more charge. so VM can move at anytime.</p><p>14.2 to 14.7 v is fully in range there, </p><p>the other new clue is.(best of all)</p><p></p><p>the <strong>stumble</strong> is actually like <strong>misfire</strong>, like a switch was thrown? Right foot is steady.that</p><p>surging (up/down) is ISA going nuts, at cruise it must be OFF LINE. </p><p></p><p>some call this <strong>bucking,</strong> like if spark dies hard at cruise, or surging. but if it cuts 100% dead, is spark loss., that is very violent and is not fuel loss but spark cut out. ( i find it using a timing light, and work from there) hard part, is driving hood removed to do that wild act. (duct tap trick)</p><p></p><p>caused by EFI spark devices all,. (for sure bad CKP/CMP) wiring to all all that.</p><p>newer jeeps:</p><p>1996 would set p0300 or some P03xx errors or a bunch. and for sure pending codes OBD1 has none.</p><p>all jeeps.</p><p>swap the horn relay to ASD relay spot yet.?</p><p></p><p>bad ground or any major wire for spark. failing,</p><p>power feeds, would not drop spark if voltage is 13vdc or higher, 10v on the bus yes fail , the PCM can drop out. Gen never goes below 13vdc, running</p><p>at battery or at dash VM, or on IGN On RUN power feeds. (out of IGN switch.)</p><p>RPM drop is fully normal for spark loss. 100% normal. (but the EFI system is failing)</p><p></p><p>I'd make sure DC power is good first using a real DMM meter set to volts mode.</p><p>and</p><p>the make sure CKP is ok and CMP too inside the dizzy.</p><p></p><p>it will not self heal, only get worse until dead. (my guess, soon spark dies and now easy to fix)_</p><p></p><p>Gross misfire is the only evidence we have now, steady foot told too, cruising.</p><p>OBD1 loves to hide misfire causes. it see it then if goes good, it does not set code. (or resets it too fast for humans to see it)</p><p>no DTC codes #11 ign failure, or 42 set. or 47 or 43 code.</p><p>no cruise controller options ,right? installed and failing hard. if yes unplug it. all off it and its own throttle cable too.</p><p>keyon CEL lamp glows and never comes on idling or driving ,correct?</p><p>I'd be all over finding spark drop out, prove it happens and then find cause.</p><p>OOPS renix PCM has no ASD relay.</p><p></p><p>yes ignition switches do fail, it's one of many things to kill park</p><p>if the RUN switch(on) drops below 10vdc, spark ends the 1sec later fuel.</p><p></p><p>a real voltmeter catches this, if has min/max features.(DMM )</p><p></p><p>the service manual cover IGN swaps, it shows the easy way. do not guess.</p><p></p><p>8D-55 , fsm</p><p>easy is can be this. no pulling steering wheel then, ,</p><p></p><p>[ATTACH=full]121838[/ATTACH]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439562, member: 21229"] [B][I]90 yJ /m/t 2.5L[/I][/B] now I see the throttle pedal [B][I]was steady[/I][/B] ! at 1400 up and engine power (hp) surges or cuts out or something, (high or low/)(CUTS LOW) TPS can't do that (its new) THAT IS if not indexed wrong to its tabs. or the wires damaged (wires /pins damaged x3) The TPS voltage must be steady at cruise, about 2vdc. not 0v ,not 5v, but at the voltage normal say for 2000 rpm. 2v and steady as you cruise. what[B] amp[/B] meter, ? none there stock.!~ I guess you meant dash center section, Voltmeter (IGN wire feed that is) drops? Tachometer drops, from what to what RPM 800 is normal hot, ISA holds that RPM hot normal. hear engine RPM drop too?, or only gauge seen to drop?> that's a tough one ,Grimiln's are. alternator is in spec, range and can change , as it wants, if it thinks battery needs more charge. so VM can move at anytime. 14.2 to 14.7 v is fully in range there, the other new clue is.(best of all) the [B]stumble[/B] is actually like [B]misfire[/B], like a switch was thrown? Right foot is steady.that surging (up/down) is ISA going nuts, at cruise it must be OFF LINE. some call this [B]bucking,[/B] like if spark dies hard at cruise, or surging. but if it cuts 100% dead, is spark loss., that is very violent and is not fuel loss but spark cut out. ( i find it using a timing light, and work from there) hard part, is driving hood removed to do that wild act. (duct tap trick) caused by EFI spark devices all,. (for sure bad CKP/CMP) wiring to all all that. newer jeeps: 1996 would set p0300 or some P03xx errors or a bunch. and for sure pending codes OBD1 has none. all jeeps. swap the horn relay to ASD relay spot yet.? bad ground or any major wire for spark. failing, power feeds, would not drop spark if voltage is 13vdc or higher, 10v on the bus yes fail , the PCM can drop out. Gen never goes below 13vdc, running at battery or at dash VM, or on IGN On RUN power feeds. (out of IGN switch.) RPM drop is fully normal for spark loss. 100% normal. (but the EFI system is failing) I'd make sure DC power is good first using a real DMM meter set to volts mode. and the make sure CKP is ok and CMP too inside the dizzy. it will not self heal, only get worse until dead. (my guess, soon spark dies and now easy to fix)_ Gross misfire is the only evidence we have now, steady foot told too, cruising. OBD1 loves to hide misfire causes. it see it then if goes good, it does not set code. (or resets it too fast for humans to see it) no DTC codes #11 ign failure, or 42 set. or 47 or 43 code. no cruise controller options ,right? installed and failing hard. if yes unplug it. all off it and its own throttle cable too. keyon CEL lamp glows and never comes on idling or driving ,correct? I'd be all over finding spark drop out, prove it happens and then find cause. OOPS renix PCM has no ASD relay. yes ignition switches do fail, it's one of many things to kill park if the RUN switch(on) drops below 10vdc, spark ends the 1sec later fuel. a real voltmeter catches this, if has min/max features.(DMM ) the service manual cover IGN swaps, it shows the easy way. do not guess. 8D-55 , fsm easy is can be this. no pulling steering wheel then, , [ATTACH type="full" alt="easy.JPG"]121838[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
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TPS setting
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