Echo419

iTrader: (1)

makes sense because I changed them last night and this am on the way to work the CEL came back on.

so to recap I've replaced the Fuel pump/filter, O2 sensors and switched back to a stock airbox. I'm going to pull the code again after work to see if it's the same.

if I get the same codes I'm thinking the fuel pressure regulator and bypass relay?

Echo419

iTrader: (1)

Well I replaced the fuel pressure regulator. Still the same problem

Shagnasty

Did you check the Oil control valve? Sometimes the screen can get clogged up.

Echo419

iTrader: (1)

oil control valve? how would that cause cycl #1  to run rich?

also how are the cylinders numbered on this car? I've done a ton of searching with 0 results that are of any use.


edit: I hate this car. it is about impossible to find anything of use online for it.
/rant

BRAD123

Stop throwing money at it and bring it to the dealer...it will probably be cheaper in the long run. Have them diagnose but not fix if you want to save as much as possible.

Echo419

iTrader: (1)

Dropping it off at Nalley Lexus Monday

BRAD123

Good Luck...let us know what they come up with.

Echo419

iTrader: (1)

Well I think I found the problem. so I went to pull the PCM and guess what. There is a unit quoted into the PCM labeled Swift Racing Computer. I suspect this is the source of the problem. I will be calling them in the morning.

Anyone have experience with these?

pbennett

I had a similar sounding problem with my older, 95 Lexus. It was "smothering down" for a lack of a better term...It would run fine, then just slow down to a halt. Let it sit for about 10 minutes, and it would run fine for a while, then do it again.

My mechanic said that it was the power steering fluid. It needed draining instead of just replacing. After he did that, he let it sit and run for a couple of hours. He said it only stopped once and after he cleared a code, it didn't stop again. The car is running again just fine. I'm not mechanically savvy, so I hope this makes sense. The fan was running, but it could be easily stopped with your hand. After he replaced the power steering fluid, the fan kept it's normal speed. The computer would think it was over heating and shut it down. I have no clue why the power steering fluid made a difference. Just telling ya what he said....

Echo419

iTrader: (1)

dealer tested the TPS and it's good. The throttle body is almost new. like 20K or less new.

I was running an aftermarket filter with oil but I changed that out with a stock airbox and newer MAF. that didn't fix it but it hasn't died and left me stranded since. however the CEL was still present and until recently the car would hesitate very bad on a launch with any real amount of power.

what's strange is I let my dad take it to "his guy". he had it for a few days said it was something internal and would need thousands. well after we picked it up the car has been running like a champ since. I mean better than ever before, very strong.
power steering fluid? yeah, I don't think so. I think you just got lucky and the problem went away.

Echo419

iTrader: (1)

here's the intake and ECU that's on the car.
http://www.swiftracing.com/SRT/item.aspx?id=86

also my friend I bought the car from saw it on this forum before he bought it. I need to check that out. I'd like to ask him who wired up this thing. very shotty work.