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vmaren

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  • Lexus Model
    1999 es 300

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  1. Thanks Mike and Steve for all your help. The problem is finally fixed. I rechecked the plug tubes for any signs of water/condensation which turned out to be negative. I cleaned the MAF again with brake cleaner and replaced both the O2 sensor behind the catalytic converter as well as the A/F sensor at the bank against the firewall, then reset the EFI by pulling the fuse and after about 10 on off cycles no Trac off/CEL light and the car is running great. I also did as Mike had suggested and checked the PCV and it was nice and snug. One thing I can say is that after changing both sensors I did not reset the EFI and the car was running like crap and both the Trac off light and the CEL lights were illuminated, but after I reset the EFI it ran great. Anthor thing I noticed is that every time I flawed it on the road a bunch of smoke was blowing out the exhaust. I guess a lot of carbon was building up in the cats and exhaust, and after about 30 minutes the exhaust was burning clean with no signs of smoke or discharge. My total cost was about 3 hours labor and $127 for the cat back sensor (OE) and $227 for the A/F sensor (OE). I guess that if the car has California emmisions which mine has, then the Exhaust manifold sensors are called air/fuel and if it is not then it would just be a o2 sensor. They look exactly alike so take note. Another helpful hint is that in order to replace the cat back O2 sensor you need to remove the drivers side seat and pull back the carpet to get at the plug it is about halfway between the center console and the drivers side door located on the floor, or you may go half assed and buy a generic O2 sensor and splice the wires? Also when I checked the plugs at Cylinder#1&5 they were black and full of carbon, I guess you can call that a rich fuel mixture. I also checked all the intake hoses before the trottle body for any leaks and a firm connection. I hope somebody may benifit from this post. Once again thanks to Mike and Steve. Vince
  2. Went to Autozone to have the codes read? Now I got p0125,p0171,p0136??????? What the hell is going on? Vince
  3. I can not post the picture of the printouts from Lexus here on the forum. If someone can email me at vmaren@aol.com. I will e-mail you the printouts. I guess that you would not post your e-mail? I promise I will only e-mail you the printouts. Thanks ........Vince
  4. Vince, in the shop manual for the 1MZFE (at least in my 2002 but its probably the same of rthe 1999) the trouble areas are listed in an order for each code. Under code P0171 it lists in this order: Air intake (hose loose) Fuel line pressure Injector blackage open or short in A/F sensor circuit A/F sensor malfunction Intake flow meter Rather than test the two items before the AF sensors and then test the AF sensor and then test the MAF sensor as the inspection procedure illustrates, it sounds like the dealer wanted to just "test by replacement" and hope it goes away. I'm guessing on this next one but I think the MAF sensor replacement is overall less expensive so they go with the mose profitable.?. steviej ← Sorry, I have spoke to soon. The problem has come back. Both the CEL and the Track off light have illuminated and the engine has begun to run a little rough. I have also noticed that the catalyic converter is getting real hot, reason being that it is pinging when I shut down the car. I have the print outs from the diaganostic machine from lexus, but cannot make out what it really means? It has percentages next to each cylinder 1-6 with the error codes. But Inskip Lexus insisted that it was the O2 sensor? Question#1 Can all the experts here on the forum reevaluate this problem? Thanks Much Vince
  5. Thanks Steve, but since I've never been to RI he's probably safe I'll never collect. The funny thing about autoshops, inde or dealer, is that for every 8-10 guys there are usually 2 or 3 aces, 2 or 3 good ones and 3 or 4 young bucks who try hard. Chances are where ever he took it the Aces and journeymen were just busy with tough cars and the simple SES light went to a newB. Fuel trim readings take experience at looking at the scanner because there are no specs. I explained in the IS forum not long ago how MAF's work and why they can cause a hesitation(and got crushed for a 2 page post). When they get dirty, they think less air is going into an engine than realy is. The ECU fires injectors acordingly. But since more air is ACTUALLY going into the engine this is not enough fuel (so say the O2 sensors). The ECU says ok, we are lean for this air flow reading, so I will add more fuel , and more and...soon it takes 20% more fuel than it should (acording to the MAF) and 20% is the threshold for setting P0171 lean code. They should be cleaned at every tuneup. Vince said..."It ran fine for about two weeks or 1/2 tank of gas before the CEL and Track off light had illuminated?" Welcome to 2 trip detection logic. If you get a cylinder missfire that misses over 50% of the time it sets in one trip with a "flashing CEL", below 50% it takes 2 trips and since it may not always check for missfire it may take more than 2 key cycles to set the code. Start-drive-shutdown does not always equal a drive cycle. Water will seep into the plug bores when you washed it and then beome a vapor due to eng heat and not missfire on the way home. It needs to fully cool and condense in the bore at least one cycle before it dribbles down close enough to the plug base to provide a gound path. In theory it would take at least 4 long drives after washing to get the light. Glad it was a simple fix for you...you will enjoy your Lex for years to come. Now I think I'll get started on the Meyers without you.....Regards, Mike ← I just want to thank you all for your help and if it cost just a drink, so be it. Sure beats $800 Inskip Lexus rip off. First off I checked all the plugs and every one was bone dry with no water or condensation. Second, I cleaned the MAF with brake cleaner and reset the CEL and Track off light by taking out the EFI fuse for a minute or two. Bamm it is running like a charm. I only drove it for about 20 miles or so, but it runs flawless, with no misfire detected at all. Runs nice and smooth. If this was the cure, then how the hell can Inskip want to charge $800??? I think that it was the MAF in the end. I hope that this post can possible help some others on the forum. I will report back if there are any problems in the future. Once again Thanks to all............... Vince
  6. Okay, Thanks for your response. I will start with cleaning the MAF and then dry out the wires. You hit the nail right on the head about cleaning the motor, but it was I who did. I took it over to my local self wash and pressure cleaned the engine after I bought it. It ran fine for about two weeks or 1/2 tank of gas before the CEL and Track off light had illuminated? I also at the same time started with 87 octane and had only burned half of the tank since then. We have had a lot of snow in my area, so I have been using my other car. The Manual states that 87 octane is okay, but premium is perferred. Question#1 Does anyone think that octane can be playing a factor in my situation? Thanks Vince I will also post all my results.......
  7. Just got back from lexus with a estimate for $800. Just purchased a 99 ES 300 with 32k and after two weeks the CEL and THe TRack off light went on. The car also feels like it is misfiring. Went to Lexus for Diagnostic and 97 dollars later it is $800 to fix. The error codes that came up are as follows P0171,P0300,P0301,P0303,P0305. They told me that Bank 1 Sensor 1 was slow and that Bank 2 Sensor 2 was not working? What I don't know is what I should do next. The Sensor after the CAT is $144 and the one on the manifold is $112 both OE. Question #1 Why did the error codes for the Senors come up? Question #2 If the sensor is acting slow does that mean that it needs to be replaced or is it acting slow based on Bank2 sensor 1 not working? Question # 3 Can anyone with expertise in this topic give me direction on how to handle this problem?
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