scw11

looking for a good mechanic in NJ Livingston area to fix my P0300 and P0307 probelm. i check the coil, connection and sparkplug and still couldn't figure out the problem. i sent my car to 2 different local garage and they could not figure out either. i won't send to the dealer unless i have no choices.

Thanks.

The best is J&B Automotive 301 EDinburg road,Mercerville ,NJ 609-890-1441 Jim Lodato, tell him Ernie Liu send you, They are very good , Honest and Mechanically the the best I know.

thanks Ernie, don't need the service now, will try it next time.

Thanks.

plz forgive me, i post this in the LS400 forum too.

need a good mechnaic in NJ northern area to fix my 98 LS400 misfire problem - p0300, p0307.

i checked the sparkplug, coil and connections, but couldn't find out the problem. sent the car to 2 local garages, they couldn't figure out either. i don't want to send to the dealer unless i have no choices.

Thanks.

01 RX300

98 LS400

93 SC400

looking for a good mechanic in NJ Livingston area to fix my P0300 and P0307 probelm. i check the coil, connection and sparkplug and still couldn't figure out the problem. i sent my car to 2 different local garage and they could not figure out either. i won't send to the dealer unless i have no choices.

Thanks.

drill down to Body- Exterior

Lift Support

looks like they don't have it for 98.

thanks.

changed mine couple days ago through autozoe #c95029( $19.99 each ).

RCRFAN got it only ( $15 ), i guess the autozoe in IL is cheaper than NJ ( $19.99 ).

Thanks.

drill down to Body- Exterior

Lift Support

looks like they don't have it for 98.

thanks.

I have no code but the right bank rear most plug does collect some oil in the plugs area of the valve cover. I wonder if that is cylinder 7?

check the circuit to the coil and plug, they looks good to me. not sure it is the fuel injector problem or not since i don't know how to check it. probabbly need to bring the car to the dealer or other tech people.

anyways, thanks for all your valuable information.

Rgds,

scw11

AC Delco is also a source. Part # 510965

Rockauto.com is listing for about $25.

plz provide the name of parts in rockauto.com, i couldn't find it.

thanks,

scw11

Yep, check engine and VSC both came on at the same time. However I didn't have the high rpm and idling issue. I seriously thought about replacing the Throttle Position Sesnor first since it was only $35. Figuring with nearly 75k miles, it wouldn't hurt. But after tons of reading and RX's advice, I went with the O2 sensor. I believe they call it Bank 1 Sensor 1, which basically is the pre-cat sensor under the truck. There's 2 pre-cats...1 under the truck and 1 infront of the radiator. Ofcourse it's the one under the truck that needs replacment. LOL Actually it wasn't bad at all. My only concern was stripping the threads as I read a few people had that problem, but there really isn't much you can do to avoid that. I simply rode the truck up on ramps, blocked the tires and put jack stands under it for security. Took all of about 2 minutes. Crawled under there and sprayed the sensor with some lubricant in hopes of it penetrating into the threads, but I seriously doubt it did anything then went up top and removed the EFI fuse to reset the codes. Came back 20 minutes later with a breaker bar and the sensor socket and crawled back under the truck. First reach up there with both hands, squeeze the release lever on the connector with your left and pull the other side to free the connector. Then pop that socket/breaker bar on, say a quick prayer and push toward the front of the vehicle to unscrew the sensor. Mine was pretty tight, but once it budged it just unthreaded very easily. Too easily I thought. But after inspecting everything there was no thread damage. So I put the copper anti-seize on the new sensor, threaded it in, tightened it up and plugged it in. Reinstalled the fuse, closed everything up and started the truck up. 250 miles later, no lights and everything seems normal. :) It sounds a lot worse than it really was. Infact, it was one of those jobs that after you do it, you're like "That was it???"

One quick note is that the exhaust should be at ambient temp, so make sure it's only running for a few seconds to get it up on the ramps if you go that route.

I bought the sensor and the socket here. Sensor Part Number is Denso 234-9009. Don't waste your money on anything else, many issues with the cheaper sensors. And after you add it to your cart, you'll see an option for the socket. I called to verify the size, and apparently 99% of the sensors are 22mm, so that socket is the correct one. I bought the kit since I like to have as many options as possible for unknown projects, but you won't need anything more than the socket for this job. Oh yeah, mine is a 2002, so if yours is a different year, you might want to verify that part#, but I'm sure it's the same since the motor is the same.

Good luck, and let me know how it turns out for you.

Topshelf,

just want to thanks you for the detail info of this problem, i just follow your instruction to change my bank 1 sensor 1 ($170 from oxygensensors.com ) today, and VSC and CEL is off now. i love this forum because people always willing to provide the help when there is a problem.

scw11

Well if it's a 98 the engine has coil on sparkplug ignition, so that narrows it down a bit. The misfire is the sparkplug itself, the number 7 coil, the primary trigger circuit to the coil, or the fuel injector or its wiring to number 7. The trick is to determine which one without throwing parts at it. Pull the spark plug first. It might be as simple as water in the plug well, or the corrosion caused by it.

SRK,

thanks a lot, will take a look this weekend.

my 98 ls400 ( 50K miles ) VSC and CEL light is on since couple days ago, the autozone told me it is p0300 and p0307 -- random misfire, misfire on cylinder 7.

anyone have this problem before? any suggestions where i should start?

replace sparkplugs/wires, distributor cap,

clean throttle body...

thanks,

scw11

the port?

It is located under the dash on the drivers side.

thanks.

my wife 01 rx300( 71K miles ) VSC and CEL light came on couple days ago, after research ( here, autozone( free code reading ) and Lexus dealer ) that point out it is bank 1 sensor 1 problem, the parts is on the way and plan to replace it asap. the car still running fine without any high rpm, not easy to shift......

unfortunately, my 98 ls400( 50K miles ) have the same lights( VSC off and CEL ) came on yesterday, still try to figure out what causes the problem. the car has a little vibration when 60 mph that never happen before.

Please help....

1. need to konw the location of 98 ls400 for OBD II code scanner?

2. also, try to search "vsc cel " in ls400 forum, but not data found.

thanks in advance.

scw11