Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Jeep Wrangler YJ
YJ General Discussion
5 volts TPS
Reply to thread
Message
<blockquote data-quote="deadpool1" data-source="post: 441218" data-attributes="member: 21229"><p><strong>oh , its only misfiring. (a whole new ball of wax as we say) so THE TPS does not cause misfire at WOT, does it misfire WOT or WOT up a hill?</strong></p><p><strong>misfire is hear and felt even see the shifter lever bounce, as engine shakes hard and 1 cylinder dropping out is 3 remaining and violent.</strong></p><p>key on 3 times see the DTC 12 ?error, my wild guess gen (bearings shot) dead and battery low error DTC.12</p><p>all EFI pages on all cars made after all tests pass and still fails, it says replace the ECU and really this is wrong. vast things can cause misfire.</p><p>ECU is dead last</p><p>even 1 weak injector can fail and misfire or injector leaks.</p><p>one spark plug bad</p><p>one cylinder has weak compression (a test) or spark plugs bad , spark wires, or spark tips (out) are carbon fouled, or antifreeze drips or oil soak or fouled in any why. learn to read spark tips ( a 100 year old engine skill that is still done)</p><p></p><p>lean fuel mix and it misfires, low fuel pressure and it misfires.</p><p>or too rich fuel mix (unplug the o2 sensor and drive ) runs better now? too rich has many causes even a bad MAP sensor.</p><p></p><p>the fuel pressure is not monitored by the ECU ever , 1996 does a bit (with trim errors etc) new cars PCM does fuel pressure not yours.</p><p>Fuel pressure<strong><em> is 31 psi at idle, and 41 (or near) at WOT</em></strong> if the FPR is bad the EFI can not regulate fuel injection correctly at all. ever.</p><p>using the Fuel pressure hand PSI gauge at the fuel rail test port is the Answer.</p><p>never seen one 30 year old FPR good. not me. they fail even 15 years old.</p><p><strong>if this car was a 1996</strong></p><p><strong>you'd scan it and see a ton of errors</strong></p><p><strong>P0300 or 301,2,3,4 300 = random misfire all 4. </strong></p><p><strong>and P017x errors way to lean or rich trim.</strong></p><p><strong>and more, </strong></p><p><strong></strong></p><p><strong>the key question (no pun) here when is does the engine misfire. (driving modes are complex, )</strong></p><p><strong>when matters HUGE></strong></p><p><strong>all the time.? no matter what.</strong></p><p><strong>at idle? only?</strong></p><p><strong>or only at tip in throttle right foot moves and hesitates only for a 1seconds or so. (TPS causes or low fuel pressure)</strong></p><p><strong>or misfires too WOT.</strong></p><p>when tells me what going on./</p><p>if the first right foot , for long time the engine lacks power even WOT, can misfire (violently) or just bogs, like dragging 1000 lb brick bind the car (lean out)</p><p></p><p>the only hard part on these old cars is not 1996 and newer</p><p>the ECU is very crude then. (lacking a real scan tool that I have) for 1995 I can even do PID scans on mine</p><p>but nobody has my tool.</p><p>that means use meters an hand gauges to find the cause.</p><p>one way to misfire is the 02 goes bad and sticks at 0volts the PCM goes max rich and misfires.</p><p>un plug the 02 sensor at the conn. and see if the now 0.45v default make fueling go better.</p><p> </p><p>next time CEL sticks on do the 3 key on trick see the DTCs errors, there can be lots..</p><p></p><p>the TPS only does enrich mode. ( the ECU sees your right foot press down hard and fast)</p><p>the ECU goes to enrich mode , called Tipin- if not it bogs for a few seconds and catches up as the slow map sensor reports the new vacuum.</p><p>the TPS HAS NO BEARING on fuel mix, at WOT< floor the pedal after the tip in delay ends., and the MAP controls fuel mix not the TPS</p><p>let be be clear your towing tailer full of bricks up a hill. you must floor it(throttle) in 3rd of 4th gear. the TPS does not control fuel now</p><p>the MAP does that and if fuel pressure or the map fails it lacks any serious power,HP, but does not misfire. it bogs. only</p><p>this assumes engine is hot 180f, not 150 or missing thermostat.</p><p></p><p>this assumes spark is not failing,.</p><p>and dead cyclinders 150psi is normal . 9.1:1 compression ratio at sea level not in Denver.(less)</p><p>clogged injectors</p><p>leaking injectors.</p><p>On any car this old I never assume the engine is good , nor injectors not bad. or fouled spark plugs</p><p></p><p>Can I assume spark parts are good.</p><p>cap, rotor, HV wire set (I use mag wires from NGK or Bosch), and the plugs are gaped to hood spec and not fouled.?</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441218, member: 21229"] [B]oh , its only misfiring. (a whole new ball of wax as we say) so THE TPS does not cause misfire at WOT, does it misfire WOT or WOT up a hill? misfire is hear and felt even see the shifter lever bounce, as engine shakes hard and 1 cylinder dropping out is 3 remaining and violent.[/B] key on 3 times see the DTC 12 ?error, my wild guess gen (bearings shot) dead and battery low error DTC.12 all EFI pages on all cars made after all tests pass and still fails, it says replace the ECU and really this is wrong. vast things can cause misfire. ECU is dead last even 1 weak injector can fail and misfire or injector leaks. one spark plug bad one cylinder has weak compression (a test) or spark plugs bad , spark wires, or spark tips (out) are carbon fouled, or antifreeze drips or oil soak or fouled in any why. learn to read spark tips ( a 100 year old engine skill that is still done) lean fuel mix and it misfires, low fuel pressure and it misfires. or too rich fuel mix (unplug the o2 sensor and drive ) runs better now? too rich has many causes even a bad MAP sensor. the fuel pressure is not monitored by the ECU ever , 1996 does a bit (with trim errors etc) new cars PCM does fuel pressure not yours. Fuel pressure[B][I] is 31 psi at idle, and 41 (or near) at WOT[/I][/B] if the FPR is bad the EFI can not regulate fuel injection correctly at all. ever. using the Fuel pressure hand PSI gauge at the fuel rail test port is the Answer. never seen one 30 year old FPR good. not me. they fail even 15 years old. [B]if this car was a 1996 you'd scan it and see a ton of errors P0300 or 301,2,3,4 300 = random misfire all 4. and P017x errors way to lean or rich trim. and more, the key question (no pun) here when is does the engine misfire. (driving modes are complex, ) when matters HUGE> all the time.? no matter what. at idle? only? or only at tip in throttle right foot moves and hesitates only for a 1seconds or so. (TPS causes or low fuel pressure) or misfires too WOT.[/B] when tells me what going on./ if the first right foot , for long time the engine lacks power even WOT, can misfire (violently) or just bogs, like dragging 1000 lb brick bind the car (lean out) the only hard part on these old cars is not 1996 and newer the ECU is very crude then. (lacking a real scan tool that I have) for 1995 I can even do PID scans on mine but nobody has my tool. that means use meters an hand gauges to find the cause. one way to misfire is the 02 goes bad and sticks at 0volts the PCM goes max rich and misfires. un plug the 02 sensor at the conn. and see if the now 0.45v default make fueling go better. next time CEL sticks on do the 3 key on trick see the DTCs errors, there can be lots.. the TPS only does enrich mode. ( the ECU sees your right foot press down hard and fast) the ECU goes to enrich mode , called Tipin- if not it bogs for a few seconds and catches up as the slow map sensor reports the new vacuum. the TPS HAS NO BEARING on fuel mix, at WOT< floor the pedal after the tip in delay ends., and the MAP controls fuel mix not the TPS let be be clear your towing tailer full of bricks up a hill. you must floor it(throttle) in 3rd of 4th gear. the TPS does not control fuel now the MAP does that and if fuel pressure or the map fails it lacks any serious power,HP, but does not misfire. it bogs. only this assumes engine is hot 180f, not 150 or missing thermostat. this assumes spark is not failing,. and dead cyclinders 150psi is normal . 9.1:1 compression ratio at sea level not in Denver.(less) clogged injectors leaking injectors. On any car this old I never assume the engine is good , nor injectors not bad. or fouled spark plugs Can I assume spark parts are good. cap, rotor, HV wire set (I use mag wires from NGK or Bosch), and the plugs are gaped to hood spec and not fouled.? [/QUOTE]
Verification
Post reply
Forums
Jeep Wrangler YJ
YJ General Discussion
5 volts TPS
Top
Bottom