be_is300

I went to the dyno/tuner shop and after dynoing the car at 135 rwhp and 136 rwtq, with HP header/ypipe and rest was stock, I was obviously very dissapointed. That was about a month and a half ago or so. The tuner told me that I should take it to lexus and have them check it out. So, I took off the aftermarket header/ypipe and put everything stock back on and took it to lexus. They had the manifold replaced and the bank 1 oxigen sensor 1 replaced as well. (He said that the sensor was running a bit slow and there was a leak in the stock manifold or something like that). It made the car sound stock again, which was a good thing. I may be missing a gasket between the ypipe and bpipe but everything else should be fine.

I went to the drag strip yesterday (Friday, April 2/04) and my time was dissapointing as well. I got 17.135 or something like that as my best run. I did 4 runs and all were pretty much in that 17.1-17.3 range (according to other ISs its suppose to be mid-high 15s). My car feels like it is barely accelerating especially around 4,000 rpm. If I lock it in M mode and put it in 2nd (driving on the street) and use about 33% of the throttle it accelerates fine untill 4,000rpm and than it feels like the car doesnt want to go as fast and kinda pulls back a bit and that continues till around 5,000 or so and than picks up a bit better afterwards.

The 0-60mph is around 9.8+ seconds (timed it with my own timer, but it cant be that far off)
Another thing, when I rev (WOT) the car in "N" or in "P" it would pause at 4,000rpm and than shoot up quick to the redline.

My tuner told me that I should get the car figured out and fixed before I put on the S/C because it may make everythint even worse. He also suggested to replace the Fuel Filer, but when I asked toyota about the fuel filter they said that this car only has one and its in the gas tank and that it doesnt need to be replaced..???

I also cleaned the MAF sensor, and the air filter is in good condition, and I am running stock 17" rims.

Any suggestions ???

PS: I feel very discouraged and pissed off about the car right now, almost to the point that I want to sell the F***ing thing and buy another IS. (I cant really afford to do that though)


Mike

mikeyis300

I would do a tune up. Did you change yoru plugs? Where there any exhaust leaks?

be_is300

They found a leak in the manifold and they replaced it with a new one. So, now it sounds pretty much stock. It may have a slight leak in the header/ypipe joint and/or ypipe/bpipe joint. Because the stock gaskets may have been destroyed (rust).

rominl

iTrader: (4)

umm..... i have no idea what could be wrong but something is definitely not right man. the time and the power nubers are all very off and no way the IS3 is slow as that. how many miles you got?

be_is300

about 45k miles. Ive spoke to one guy and he told me it must be something either with fuel or ignition. Told me to clean my injectors maybe change spark plugs.

grego2

Sounds like a good start. When you said you cleaned the MAF, what exactly did you do?

TCM080903

any updates on your car? i'm curious to know what the prob was...i can't even imagine our car only dyno'ing 135rwhp, esp with headers/y-pipe...