So in the attached image you can see the list of dtcs I have on a 2000 rx 300 AWD
I have tested coils and replaced spark plugs on 2-4-6, all should be in perfect shape.
I have tested unplugging the coils I could easily access with the entire intake assembled, which seemed to not affect the idle, leading me to believe that perhaps those spark plugs in the back are no good.
I am going to head back out now to work on getting to and replacing the 1-3-5 spark plugs, if I can manage.
1. With the intake and throttle body(s?) removed, is it worth any attempt to remove the o2 sensor from above? I tried from below several times, with PB blaster let to sit overnight, to no avail.
2. As I was taking off the intake filter lid, I could swear that one of the two "vacuum" hoses directly behind it, may have been unattached. I followed the one that is attached and it seems to lead to the Fuel Injector rail for 2-4-6. With this logic, would it make sense that the other tube leads to 1-3-5 injectors, and all this could have been from the vacuum leak causing those cylinders to run lean/misfire?
3. Is there anything else I should check while I have the throttle body's off (and cleaned up beautifully) like the MAF, etc? I do have a multimeter, but I have only tried using it a couple of times and am not 100% on which items to check for which values.
4. Is there anyone here with any insight on what values to check on my Code Scanner's "Live Data"? I found a great OBD2 scanner, but I don't know how to use these tools to verify the fix...
My plan now is to replace the 1-3-5 spark plugs, reassemple the intake, verifying all connections are made and see how she runs... but I will work at the o2 sensor or anything else possible, while it's apart.
Thank you if you read this! I am new to the forum, as I just purchased this car for my wife, so thanks in advance, if anyone hears this!
Hello everyone! I’m pretty new here, and before I ask my question, yes I’ve been throughout forums seeking answers and have tried a few things but now I feel as though I need advice.
Recently grabbed a ‘93 LS400 that’s been misfiring. I just had the alternator and belt tensioner replaced but the car did stall out on me due to very rough and low idle. Check engine code comes up for the mass air flow sensor and TPS, both of which were replaced and recently adjusted by my mechanic. I had heard that if the catalytic converters were glowing red that means that they were possibly clogged, possibly oil in the cylinders leaking(?). I’m not sure, I’m fairly new to these vehicles in general.
One thing to keep note of is, the check engine light is illuminated. When I give the car gas it shows major power loss, however halfway thru second gear the car starts to pickup/ maintain speed and the check engine light goes away. Once I come to a stop, or even let off the gas for a bit the CEL comes back. Complete stop brings the rough idle back. I did read that the ignition coils could be to blame as well. I changed the one dead center in the engine, but not the second one by the battery.
My question is should I be weary of the cats? My plan was the yank them and simply straight pipe the car on back. However efficiency is all I want now considering I haven’t had time to even enjoy the car since I purchased it 😟
I'm looking for answers to my mysterious knock sensor code on my 2001 LS430 180k miles. P0325 Knock sensor circuit 1 is the code I am recieving. Trying to do some preventative maintenance I changed the spark plugs with NGK laser iridium. Prior spark plugs I believe were the Densos. I as well changed a leaky PCV hose and went ahead and did the valve. The car ran great for roughly a week or so and then the code came and hasn't left. I seafoamed the car as well after getting the code. If I reset the code the car runs great, but returns shortly. I notice a slight tick and pinging under hard acceleration. Any suggestion would greatly be appreciated! I changed the spark plugs again also hoping maybe one of the NGK's was gapped incorrectly. I've went over the harnesses looking for shorts. It just seems strange I change the spark plugs and a knock sensor decides to give out.