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About threepwood

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  • Lexus Model
    1992 LS400
  • Lexus Year
  • Location
    Florida (FL)
  1. threepwood

    92 LS400 with karman Vortex MAF

    Thanks for your response. After looking at the design I decided not to take the chance and just returned the CRC for a refund, pointing out the note on the can about Lexus,
  2. I bought a can of CRC mass air flow sensor cleaner, did not read the fine print. After getting it home read the fine print which says do not use on Karman Vortex MAF's used in Lexus. As far as I can tell, that is exactly the type in my LS400. I searched internet and seems like it will not harm the sensor but won't do much for it as this type of MAF uses a photodiode and not heating wire? Anybody have experience with this stuff? Thanks.
  3. No codes, just continuous flashing. Just to see what would happen, I pulled the MAF sensor connector with engine runniing. Engine died and now I get codes 12,24 and 31. Cleared codes by pulling fuse and went for a drive in diagnostic mode. Still a lot of hesitation but no stalling. Came back home to check codes, still no codes, just continuous flashing.
  4. Will do, but will there be a code even without a check engine light? No check engine light. Just asking, I don't know. But it has gotten much worse. Can not drive car. Sits there and cycles between near zero rpm and 400 rpm continuously at idle.
  5. It all started after making a sharp rapid left hand turn to beat a short left hand green arrow. Suddenly idle dropped to near zero and pushing pedal to the floor could not keep it running. Acted like it had water in gas tank, that's the only way I can describe it. Could restart car and would run for another 30 feet and then it acts like it's running water instead of gas thru the engine (no power, extremely slow engine rpm increases with gas pedal floored then suddenly it would catch and take off like a rocket). Note, tank was down to 1/4 tank of gas. I nursed it home, put 4 cans of dry gas and 1 can of gumout in it and left it over night. Was able start it next morning and stumbled to nearest gas station to fill it up. Took it home and it started to run properly. Now, every morning when I start the car for the first 3-4 miles it stumbles and acts like something other than gas is running thru it. Fearing it was another ignition coil failing intermittently I put a power timely light on both coils and drove the car around. Both coils are functioning properly during these surge incidents. And this is Florida, so cold starts are not all that cold, as it was 88F here today. What I'm looking for is known issues that might be causing this surging. Bad Egr valve, mass air flows sensor failing, maybe a screen inside gas tank plugged, etc.). Thanks for any suggestions you can make.
  6. threepwood

    92 LS400 flashing AC button light

    Ok, thanks for trying.
  7. threepwood

    92 LS400 flashing AC button light

    33 keeps coming back. I have cycled the vents many times and all seem to be working fine but it still keeps coming back. Is there any way to bypass this error so I can put the relay back in? Would like to have the compressor lock up protection and this error seems to be silly as the vents all seem to be working properly and maintains 74 in auto just fine.
  8. threepwood

    92 LS400 flashing AC button light

    Ok, put relay back in, back to flashing light and code 33. Jumper will stay for awhile I guess.
  9. threepwood

    92 LS400 flashing AC button light

    Many thanks. Unexpected code, 33, air mix damper position sensor ?? Doesn't sound like something I could have knocked loose replacing compressor. And even stranger, after hitting the off button the light has stopped flashing? Repeatedly started car and light no longer flashes? Will try putting relay back in later today to see what happens. Thanks again.
  10. First, the simple question. Is there a way to read the error code that is causing my AC button light to flash and disengaging the clutch? More detail. Engine backfired when do a seafoam "suck it in and let it sit" restart, causing compressor locked up solid. Next time I'll remember to turn AC off. I replaced the compressor. New compressor will only run for 2 seconds before light starts flashing and clutch disengages. I pulled clutch relay and jumpered to engage clutch. AC is working perfectly, even in auto mode, but light still flashes with jumper installed. Pressures at 2000 rpm are "by the book" around 25 and 210. So I think it's fully charged and cools just fine, but I would consider fixing something if I could figure out what is causing this. 157k on odometer.
  11. threepwood

    Intermittent 0 - 3000 rpm action'

    Thanks, that essentially what i did by wedging the the relay in the deenergized position. I forced the no resistor side to be in service all the time. I put an ohmmeter across the resistor and it was within spec.
  12. threepwood

    Intermittent 0 - 3000 rpm action'

    I have ordered one from Rock auto ($15) - hope it fits. Fortunately I don't need to run the car, in fact it doesn't have plates anymore. It started acting up on the way home from the honda dealer, who wouldn't give me anything for it in a trade. I took the plates off it and put them on my new honda accord v6. But I did not want to sell it to anybody knowing it could do this to them randomly at any time. Dealer said even though it only has 150k miles it's only worth $500 in trade and it would cost him $400 to send it to auction so he wouldn't even take it. very disappointing.
  13. threepwood

    Intermittent 0 - 3000 rpm action'

    Well, I pulled the fuel pump relay, took it apart, looked at contacts and they were well worn, even felt sticky. I cleaned them up with some very fine sand paper, put it back in and now the car is doing the surging ALL the time. This relay is rather expensive, like $80. So I take the cover off again and I wedge the contact to the energized position. Car stats and seems to run just fine. check voltage on contacts to ground with ignition on, 12 volts. Ignition off 0 volts. check voltage on relay coil. ignition off, 0 volts. ignition on 0 volts. If I understand the book correctly, deenergized is directly to fuel pump and energized is thru the resistor to the fuel pump. This would indicate to me the resistor and pump are fine and the contacts deenergize are shot. Do you guys agree? So are they any dire consequences to leaving the wedge in until i get a new relay. My mechanic friend says I will kill the battery, but I do not read any voltage on the contacts until I start the car. Ok - more - I just went out and wedged the contacts in the deenergized position to see what happens. Car starts and rev's just fine. So if you had to wedge it until you get a new relay, which way would be better?
  14. Hi, I have a 1992 LS400. Driving on superhighway this past weekend at 65mph the car started bucking and surging. So bad I had to get off the highway and take local streets home. On the way home I would shift it into neutral and rpm would drop to near zero then i would pump the gas and rpm would jump up to 3000 rpm. Then I would let off to get the rpm down to 1500 and put it back in gear. it would run fine for a few hundred feet then the surging would start again. I might have said it was acting more like bad gas (water) than anything else but I'm pretty sure it wasn't. Unscrewed gas cap and tank was pressurized. Started trip again and it kept doing the same thing. Let it sit overnight, thinking I maybe lost another ignition coil (even though I replaced both the last time 1 failed).. But that time the exhaust turned cherry red from the unburnt fuel. This time it did not. Next morning I started it up, ran it for 2 hours and it ran perfectly with no issues??? I checked coils anyway and they are good. Talked to a mechanic friend and he thinks it's a bad fuel pump relay. Is this a possibility? Any other thoughts? Many thanks for the help in advance.
  15. Many thanks for your kind thoughts. Unfortunately she passed away at 4:07 am. Thankfully I was there for her, but the pain is no less. I would like to pass on her final words of wisdom to you all "you never know when the last time you did something will be the last time you ever do it." So please, for us, hug your spouse or significant other today and tell them how much you love them, as you never know when it will be the last time.