Help !!! sputtering, no power, red cats,shaking.!!

Reply Subscribe

Thread Tools

Search this Thread

11-14-13, 01:32 PM

#16

SC400slide

In Recovery Mode

iTrader: (11)

Join Date: Apr 2012

Location: NM

Posts: 3,868

Likes: 9

Received 33 Likes on 27 Posts

Quote:

Originally Posted by Murco

That "running rich" smell could be from clogged cats. That would recycle fuel through the evap system and overwhelm the filter for the system. I've never seen this happen on a Lexus and I'm not intimately familiar with the evap system on an SC but the glowing cats sure lead me in that direction!

The OP said that he was burning a ton more fuel then normal, so I'd suspect Fuel control. In the mere future, the Cats will definitely need replacing, obviously.

Reply Like

11-15-13, 12:11 AM

#17

2jznosht

Lexus Test Driver

Join Date: Aug 2011

Location: NM

Posts: 1,024

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by SC400slide

Yes, but he needs to track down what is causing the "running rich" issue before he replaces the cats. The honeycomb inside will just melt again and clog if he doesn't fix the unburned fuel issue entering the exhaust.

I have a 93 and it was just age that did mine in. The rich smell could just be coming from the cats not functioning

Reply Like

11-15-13, 01:56 PM

#18

1995sc3

Driver School Candidate

Thread Starter

Join Date: Apr 2012

Location: CA

Posts: 18

Likes: 0

Received 0 Likes on 0 Posts

Update he styill cannot find out what the problem is, the muffler shop said my cats were plugged so they deleted all the cats even the one right fter the headers

things are fine-
injectors
timing
distibutor
ignition coil
compression
tps

any ideas i have no car

please help anyone in socal have a ecu that might have one i can borrow if thats the problem ill gladly buy it

Reply Like

11-15-13, 02:51 PM

#19

1995sc3

Driver School Candidate

Thread Starter

Join Date: Apr 2012

Location: CA

Posts: 18

Likes: 0

Received 0 Likes on 0 Posts

Hel,p please i do not have a car they cannot find the problem

Things that were checked
Injectors
timing
dis
ignition coil
compressison
fuel ecu
tps

is there anything else that might be holding it back please help you guys i appreciate it

could it be my general ecu if so could anyone in socal have one laying around i could borrow and pay for if it is my ecu. Ill gladly buy it if my ecu is actually the culprit.

Reply Like

11-15-13, 07:20 PM

#20

SC400slide

In Recovery Mode

iTrader: (11)

Join Date: Apr 2012

Location: NM

Posts: 3,868

Likes: 9

Received 33 Likes on 27 Posts

Could very well be your ECU. Did you ever do the 12v mod on the Fuel control?

Reply Like

11-16-13, 04:22 PM

#21

SCstone

Pole Position

Join Date: Sep 2013

Location: Tx/Co

Posts: 233

Likes: 0

Received 0 Likes on 0 Posts

just throwing em out there but charcoal canister and fuel filter/pump, fuel regulator. iacv. no codes?

on a n/a you need cats for back pressure and such.

Last edited by SCstone; 11-16-13 at 04:26 PM.

Reply Like

11-25-13, 03:02 PM

#22

1995sc3

Driver School Candidate

Thread Starter

Join Date: Apr 2012

Location: CA

Posts: 18

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by SCstone

just throwing em out there but charcoal canister and fuel filter/pump, fuel regulator. iacv. no codes?

on a n/a you need cats for back pressure and such.

fuel pressure is at 40psi and 50psi at full throttle is that ok?

Reply Like

11-25-13, 03:21 PM

#23

1995sc3

Driver School Candidate

Thread Starter

Join Date: Apr 2012

Location: CA

Posts: 18

Likes: 0

Received 0 Likes on 0 Posts

No my mechanic did not want to do that, he checked fuel pressure and he said it was fine because its at 40psi at idle and 50 at wot is that fine?

Reply Like

11-26-13, 07:33 AM

#24

SC400slide

In Recovery Mode

iTrader: (11)

Join Date: Apr 2012

Location: NM

Posts: 3,868

Likes: 9

Received 33 Likes on 27 Posts

Another thing you can do is rip open the main ECU and check closely for leaking capacitors.

For the future, fuel pressure should be between 38 and 44 PSI. At WOT, 50 is fine. (older SC models go a little higher)

Reply Like

11-26-13, 08:55 AM

#25

Murco

Pole Position

iTrader: (1)

Join Date: Nov 2011

Location: MN

Posts: 216

Likes: 0

Received 2 Likes on 2 Posts

You've checked the coils, distirbutors, timing, and the cats are off... How about the ignitor (ignition control module) and plugs? Has your tech done a "smoke" test (pressuring the system with a smoke generator)?

Reply Like

11-26-13, 11:43 AM

#26

CatManD3W

Pole Position

iTrader: (18)

Join Date: May 2013

Location: Pittsburgh, PA

Posts: 2,207

Likes: 3

Received 25 Likes on 17 Posts

Check the Main ECU under the carpet on the passenger side foot well...Most likely your capacitors in the ECU need repaired...Do you know someone close by that you could swap out ECU's with. If not you could try replacing the ECU....Im sure someone on the forums has one for sale