ajonesy

Car ran fine the same morning. Later it lost power so much had to shift to low and back in drive just to go. Parked wouldn't go past 4,000 rpm. Both cats glowed red while revving. Tried new spark plugs and wires still no change. Sounded better though. My power steering had been leaking. Rebuild kit worked for a week then the leaking and whining sound when I turned came back. Help!!!!

RA40

iTrader: (6)

Welcome to Club Lexus.

For help posts, we need to know year, miles on car and any readable error codes. With an error code we know what to suggest rather than having your wallet open up for a random parts hunt.

ajonesy

1994 LS400. I haven't had it scanned for error codes. Tried but they don't do it anymore if it's below 1996.

ajonesy

222,000 miles

dicer

Rebuild kit for what? The pump or the rack?

Glowing red cats, they are getting too much unburnt fuel. Could be from anything from ignition problem you've addressed part of that already. Could be ecu, cold start valve leaking, injector leaking, high fuel pressure, engine coolant temp sensor, timing is all that comes to mind.

ajonesy

Rebuild kit for the pump. We'll be checking ignition coils soon.

700bones

what does that have to do with your exhaust?

If it were my car, I'd just do a cat delete.

ajonesy

Didn't say it did. Just making sure all the problems I've been having were out there. Did research on loss of power and found to check the coils. It had loss of power before cats glowed red. Cats are being took off right now.

ajonesy

Bad driver side ignition coil

dicer

I think its a huge mistake to remove the cats for many reasons. First: from what I have read while searching is it is a federal epa no no with steep fines to remove emissions stuff from cars that were made with the stuff, it was put there for a reason. I am the last one to agree with any enviro nut case stuff, but I also remember the days of burning eyes sitting in traffic behind an untuned chevy spewing out the smell of raw gasoline and oil fumes. Second: doing this sort of thing is going to catch the wrong attention someday and ruin the car hobby for us all.
Third: The whole of the EFI system is the exhaust system too, there are pre cat and after cat sensors that like to be satisfied to make the engine run right, your ruining the tune of the engine doing it unless you have an after market ecu that is fully programmable. Forth: If in doing this your LS ends up smelling like that old chevy its going to make people make a call to rid all the LS's from the hiways and streets. Fifth: Its like any other mod done on these cars, makes it worth scrap or parts prices.

fixmiester

There's so much wrong with this picture I don't know where to start. Use some logic here: READ THE CODES! If you don't know how, then spend a little time to find out. If both cats are red, and the engine is running fairly smooth (not missing), then your problem is strictly something that affects the timing or the air/fuel ratio: MAF sensor, ECU, crank angle sense, clogged air filter, etc. NOT coils, wires, or plugs.

PureDrifter

iTrader: (10)

1- read the codes the FAQ has links on how to do so.
2- replace the faulty ignition component(s) that's causing the car to misfire and run super duper rich, dumping raw fuel into the cats and killing them.

My bet is on a bad coil/igniter.

700bones

Not everyone lives in the US where that law applies though. Lots of members from Mexico/Latin America, etc.



Sure, to create barriers to entry in the auto manufacturing industry (foreign copmetition was becoming fierce at this time). Lobbiests tend to get laws passed that benefit their patrons.



LOL the sky is falling! Yeah no. Like I said, it's a matter of well settled law. See above.


Only the pre-cat o2 sensors are used to adjust air/fuel ratio on 1st gen ls400. Nobody said anything about removing o2 sensors anyway.
Again, that's WRONG, see above.

You really like repeating wrong stuff over in different ways don't you? Again, air fuel ratio is not affected by cat delete.

[/quote]
LOL! Maybe you are in the wrong place. The whole point of this board is information on aftermarket, modifications, and tuning.

PureDrifter

iTrader: (10)

700bones exit this thread. You are not allowed to make detrimental personal comments towards other members. Your post has been edited, do not alter it.

This is your warning.

ajonesy

Well car ran fine for a week then the same problem!! Worse actually. Now it will barely start most of the time won't start. Fouled spark plugs. Rich in fuel. Backfiring and even backfiring sounds under the hood. Read the codes and got code 28 that's it. O2 sensors.