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95 4 runner with pulsing idle
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kcoughlan
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Mar 5, 2017, 3:29 PM
Post #1 of 16
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95 4 runner with pulsing idle
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I've got a 95 toyota 4runner V6 3.0l with over 300,000 mi. and I began having issues with it dying while driving at any speed, just cut out and pressing the accel. had no impact whatsoever but I could put it in neutral and restart while coasting.The idle during this time was level at 1400 rpm or so. I replaced the fuel filter, removed the air intake manifold and removed the pcv valve and it shook freely, I cleared MUCH gunk out of the air intake body(aluminun cast body on top of engine block) and the wands inside, finding one of them VERY clogged.I found the air filter to be very clogged with dirt and leaves so I replaced and also sprayed the MAS with appropriate cleaner. I removed and replaced the throttle position sensor as well and adjusted. I also found a broken wire to my oil pressure sender and ended up connecting the wire directly to the sender( gauge on dash now works again). The vehicle seems to run strong now but as soon as I put it in neutral the rpm's fluctuate from 1500 to 1750 every 2 seconds. It will start to do this as soon as I start the car and it warms up and when take the oil cap off, the engine returns to a steady 1500 rpm., replace the cap and it immediately begins the pulsing again. Vehicle drives fine otherwise with no fluctuations in rpm when in any gear .Can the pcv valve be bad even if it rattles around freely? (I did not replace this) Could the MAS cause this ? I'm running out of ideas, Thanks !
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 6, 2017, 1:28 AM
Post #2 of 16
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Re: 95 4 runner with pulsing idle
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300K! How long do you think this can last overall before it does something with apparent neglect long enough to clog things up as you mentioned?
Just PCV: It is usually good if it rattles but if there's no vacuum to it the fumes it was intended to consume are just wrecking this engine. See if that is intact and draws vacuum at least.
IDK think about this vehicle and how much you want to do to it or spend but do chase down vacuum leaks including PCV then maybe time for a compression check so you don't end up throwing too much good money into this,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 6, 2017, 7:18 AM
Post #3 of 16
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Re: 95 4 runner with pulsing idle
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Jumper te1 to e1 in the diagnostic connector, turn the ignition on, and count the flashes of the check engine light. Write down the codes numbers.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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kcoughlan
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Mar 6, 2017, 8:20 AM
Post #4 of 16
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Re: 95 4 runner with pulsing idle
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after plugging into te1 and e1 I got a 243141 code
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kcoughlan
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Mar 6, 2017, 8:58 AM
Post #5 of 16
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Re: 95 4 runner with pulsing idle
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I think I got 3 codes 24, 31, 41 with a 2.5 sec delay between them
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Discretesignals
Ultimate Carjunky
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Mar 6, 2017, 10:39 AM
Post #6 of 16
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Re: 95 4 runner with pulsing idle
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It's possible for those codes to set if you had unplugged the connectors from any of those devices with the ignition on or engine running. If that is the case, you may need to clear those codes and then see if any reappear.
CODE NUMBER 24
- System: Intake Air Temperature. Sensor Signal
- Malfunction Indicator Lamp: Normal Mode ON, Test Mode ON
- Diagnosis: Open or short in intake air temperature. sensor circuit for 0.5 seconds. or more.
- Trouble Area: Open or short in intake air temperature. circuit, Intake air temperature. sensor, ECM
CODE NUMBER 31
- System: Volume Air Flow Meter Signal
- Malfunction Indicator Lamp: Normal Mode ON, Test Mode ON
- Diagnosis: At idling, open or short detected continuously for 0.5 seconds. or more in volume air flow meter circuit: Open - VC and Short - VC - E2.
- Trouble Area: Open or short in volume air flow meter circuit, Volume air flow meter, ECM
CODE NUMBER 41
- System: Throttle Position Sensor
- Malfunction Indicator Lamp: Normal Mode California only ON, Test Mode ON
- Diagnosis: Open or short detected in throttle position sensor signal (VTA) for 0.5 seconds. or more. IDL contact is ON and VTA output exceeds 1.45 V.
- Trouble Area: Open or short in throttle position sensor circuit, Throttle position sensor, ECM
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
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Mar 6, 2017, 11:31 AM
Post #7 of 16
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Re: 95 4 runner with pulsing idle
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That sure sounds like somebody unplugged the MAF with the key on.
Codes for both the IAT and MAF usually happen when MAF is unplugged.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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kcoughlan
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Mar 6, 2017, 1:06 PM
Post #8 of 16
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Re: 95 4 runner with pulsing idle
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I cleared the EFI by pulling it out for several minutes and reinstalled, took it for a spin but eventually it began to pulse again and the idle rpm's are at 1700.The codes still read the same.I adjusted the tps while running to see if that changed anything but it just made the rpm's go up. Is there a better way to clear the EFI? Could the MAS be bad and cause all those codes to reappear?
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kcoughlan
User
Mar 6, 2017, 1:43 PM
Post #9 of 16
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Re: 95 4 runner with pulsing idle
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can I reset the codes by pulling the EFI fuse ?
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Discretesignals
Ultimate Carjunky
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Mar 6, 2017, 1:47 PM
Post #10 of 16
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Re: 95 4 runner with pulsing idle
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Disconnect the battery for 30 seconds.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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kcoughlan
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Mar 6, 2017, 5:10 PM
Post #11 of 16
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Re: 95 4 runner with pulsing idle
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Finally some success, I finally got 2 of the codes to clear but am still dealing with a tps code alert despite replacing the tps. The idle no longer pulses although it runs too high, at 2700 rpm and the check engine light is now on...otherwise the vehicle drives fine .......could I have a faulty tps ?
(This post was edited by kcoughlan on Mar 6, 2017, 5:18 PM)
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Hammer Time
Ultimate Carjunky
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Mar 6, 2017, 5:59 PM
Post #12 of 16
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Re: 95 4 runner with pulsing idle
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Just because you have a TPS code does not mean the TPS is the cause.
It can be the wiring, the plugs, the computer or a mechanical issue. You need to manually test the circuit to isolate the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Mar 6, 2017, 6:01 PM)
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kcoughlan
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Mar 6, 2017, 6:31 PM
Post #13 of 16
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Re: 95 4 runner with pulsing idle
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Thank you for the responses, I guess it's time to go to a shop and use the tools I don't have ....Thanks Again everyone!
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kcoughlan
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Mar 7, 2017, 3:04 PM
Post #14 of 16
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Re: 95 4 runner with pulsing idle
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update on issue... continued to have check engine light on and high rpm in idle this morning so I decided to reinstall the original TPS and give it a try and BINGO! I have clear codes and the vehicle runs better than ever.I adjusted my throttle down a little bit and it idles at 1250 rpm. I'm guessing this "new" TPS I got was bogus.I hope they take it back, it was $100. Thanks for all the imput and suggestions, they really helped me piece this problem together and have a positive result. I'd hate to think what that would have cost me to have done ...always satisfying when you can take an old reliable vehicle and keep her goin for just the cost of parts! Thanks again all!
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Hammer Time
Ultimate Carjunky
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Mar 7, 2017, 3:21 PM
Post #15 of 16
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Re: 95 4 runner with pulsing idle
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If it's idling @ 1250, you still have a problem somewhere.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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kcoughlan
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Mar 29, 2017, 1:30 PM
Post #16 of 16
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Re: 95 4 runner with pulsing idle
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Still messing with this damn thing.....I've replaced the MAF, air filter, fuel filter, cleaned out lots of gunk from the air/fuel mixer on top and the cold start valve as well as the vacuum hoses going into the same.Cleaned the Throttle body as well as i could without removing and have tested and adjusted the TPS as well. Vehicle has no problem starting but will only go 5 mi. before the stalling starts . ..the longer I wait the longer I will be able to drive it until the next stall. Always starts right up but feels like it's starved for gas as I accelerate although the last time I got it going it got me back home and is still running here in the drive at a 900 rpm idle. Could a bad fuel pump do this? Seems to idle just fine but driving it creates the problem. How bout the air intake sensor? could that create these conditions? I live 20 miles from the nearest decent mechanic so I'm trying to figure this out without having to tow it to him....and I've mostly enjoyed tearing this thing apart.....really could use some success......
(This post was edited by kcoughlan on Mar 29, 2017, 2:28 PM)
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