01 is300 misfire, throttle bogging, and random shutdowns
10-22-18, 12:19 AM
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01 is300 misfire, throttle bogging, and random shutdowns
Hello everyone, thank you for taking the time to read my first post.
I recently bought an 01 is300 that would not start. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned)
I have searched around all the lexus forums for the last week with no help on my current problem. at the moment she starts up just fine and idles like a champ, maybe a sputter pr two, however nothing too bad. The problem comes when i try to rev her out, she bogs down from idle until 3500 then jumps up like crazy. I get a misfire code at random times for random cylinders and the traction light blinks. if i attempt to drive her, she is rough in the lower rpm and either jumps like crazy up high or just bogs and when i let off dies while in motion. on my scanner, open loop fuel has a question mark next to it, so does the tp %, and bank 2 sensor 1 O2 sensor.
I was told either a bad throttle body level sensor because of the bogging or a bad fuel pump.
I'm tired and given up hope on fixing her without ripping out my hair. so anywhere to send me looking is much appreciated.
I recently bought an 01 is300 that would not start. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned)
I have searched around all the lexus forums for the last week with no help on my current problem. at the moment she starts up just fine and idles like a champ, maybe a sputter pr two, however nothing too bad. The problem comes when i try to rev her out, she bogs down from idle until 3500 then jumps up like crazy. I get a misfire code at random times for random cylinders and the traction light blinks. if i attempt to drive her, she is rough in the lower rpm and either jumps like crazy up high or just bogs and when i let off dies while in motion. on my scanner, open loop fuel has a question mark next to it, so does the tp %, and bank 2 sensor 1 O2 sensor.
I was told either a bad throttle body level sensor because of the bogging or a bad fuel pump.
I'm tired and given up hope on fixing her without ripping out my hair. so anywhere to send me looking is much appreciated.
11-07-18, 02:56 PM
#2
Hello everyone, thank you for taking the time to read my first post.
I recently bought an 01 is300 that would not start. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned)
I have searched around all the lexus forums for the last week with no help on my current problem. at the moment she starts up just fine and idles like a champ, maybe a sputter pr two, however nothing too bad. The problem comes when i try to rev her out, she bogs down from idle until 3500 then jumps up like crazy. I get a misfire code at random times for random cylinders and the traction light blinks. if i attempt to drive her, she is rough in the lower rpm and either jumps like crazy up high or just bogs and when i let off dies while in motion. on my scanner, open loop fuel has a question mark next to it, so does the tp %, and bank 2 sensor 1 O2 sensor.
I was told either a bad throttle body level sensor because of the bogging or a bad fuel pump.
I'm tired and given up hope on fixing her without ripping out my hair. so anywhere to send me looking is much appreciated.
I recently bought an 01 is300 that would not start. I have so far changed the timing belt and tensioner, plugs and wires, ocv, cleaned the screen, fixed cracked lines, new vacuum hoses, fuel strainer, fuel filter, tried 4 different maf's, and cleaned the injectors (removed and cleaned)
I have searched around all the lexus forums for the last week with no help on my current problem. at the moment she starts up just fine and idles like a champ, maybe a sputter pr two, however nothing too bad. The problem comes when i try to rev her out, she bogs down from idle until 3500 then jumps up like crazy. I get a misfire code at random times for random cylinders and the traction light blinks. if i attempt to drive her, she is rough in the lower rpm and either jumps like crazy up high or just bogs and when i let off dies while in motion. on my scanner, open loop fuel has a question mark next to it, so does the tp %, and bank 2 sensor 1 O2 sensor.
I was told either a bad throttle body level sensor because of the bogging or a bad fuel pump.
I'm tired and given up hope on fixing her without ripping out my hair. so anywhere to send me looking is much appreciated.
how does it sound when MAF is disconnected?
I would check the TPS though too, and potential throttle body cleaning. if coolant is up to proper level and throttle body is clean you might wanna start off with idle relearn as well.
11-20-18, 06:17 PM
#3
Pole Position
The o2 sensors not reading properly will cause all kinds of fun problems for these cars and put them into limp mode. Same with the throttle sensor. I'd correct all the codes on your car first and then see how it goes. O2 sensor codes can be exhaust leaks too, rather than bad o2 sensors..... so make sure you check for that before spending money and time on replacing sensors that may be working properly.
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