08-19-2019, 11:35 PM
|
#1
|
Junior Member
|
|
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
|
Junior Member
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
Exhaust or catalyst issue?
Hello all
So I took the new 1997 T4R out for a drive yesterday and going up hill with high throttle it seemed really under powered and then I noticed a strong smell almost like someone lit off fireworks under the car kind of a sulphur smell - pulled over and smell went away at idle
Looking under the truck, I see no clear disconnections in the exhaust system but interestingly, there is no flow coming out of the exhaust pipe can put your hand over it and feel nothing but can smell an exhaust smell in cab and at front of truck, no clear exhaust leak noises
No MIL on, no DTCs on scan tool but catalyst (and evap) drive cycles incomplete (O2 sensor and O2 sensor heater completed) - not sure what it takes to complete a catalyst or evap drive cycle
Running graph on O2 sensors (below) bank 1 sensor 1 seems to be cycling OK, bank 1 sensor 2, however, seems low voltage and is also cycling not pegged out at a specific voltage but not sure what could cause that
Wondering if the catalytic converter may be bad or if there is a blockage in the exhaust system somewhere....
Any thoughts?
Thanks as always for your help
|
|
Reply With Quote
|
08-19-2019, 11:36 PM
|
#2
|
Junior Member
|
|
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
|
Junior Member
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
Sorry - the graph was captured with engine warm and running at about 2,500 RPM
|
|
Reply With Quote
|
08-20-2019, 07:36 AM
|
#3
|
Elite Member
|
|
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
|
|
Elite Member
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
|
Is your tail pipe broken off at the rear of the muffler?
Sent from my iPhone using Tapatalk
|
|
Reply With Quote
|
08-20-2019, 08:51 AM
|
#4
|
|
Member
|
|
Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
|
|
Member
Join Date: May 2015
Location: Massachusetts
Posts: 648
Real Name: Keith
|
just maybe
__________________
*1999 3.4L, 4wd/5spd, swapped motor and trans, heavy use DD, seasonal rust proofing using WD-40 only
*2000 3.4L, 4wd/5spd, parts rig, picking the carcass
|
|
Reply With Quote
|
08-20-2019, 09:42 AM
|
#5
|
|
Senior Member
|
|
Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,339
Real Name: Mike
|
|
Senior Member
Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,339
Real Name: Mike
|
Sounds like your CAT is plugged up.
__________________
1997 SR5 4x4 Auto, 99' tall coils up front, OME 906's, Truetrac LSD, Airaid MIT
1999 SR5 4x4 Auto for parts
2011 Camry SE V6
2011 Highlander Limited
|
|
Reply With Quote
|
08-26-2019, 12:44 AM
|
#6
|
Junior Member
|
|
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
|
Junior Member
Join Date: Aug 2019
Location: Flagstaff
Posts: 12
|
So I think it is both. Finally crawled my fat self under the truck and yes, the exhaust is broken off at the muffler but with that smell on acceleration and the poor power + the O2 sensor waveforms I am thinking my cat is bad as well. I plan on just replacing the whole exhaust as its rusted out in a couple spots anyways. Glad I don't live in CA or NY
|
|
Reply With Quote
|
08-26-2019, 11:00 AM
|
#7
|
|
Elite Member
|
|
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,498
|
|
Elite Member
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,498
|
Quote:
Originally Posted by npschuma
So I think it is both. Finally crawled my fat self under the truck and yes, the exhaust is broken off at the muffler but with that smell on acceleration and the poor power + the O2 sensor waveforms I am thinking my cat is bad as well. I plan on just replacing the whole exhaust as its rusted out in a couple spots anyways. Glad I don't live in CA or NY
|
On a '97, exhaust is the same for all 50 states. The only advantage is you don't need CARB approved parts, but NY does not require those or anybody else.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
|
|
Reply With Quote
|
08-26-2019, 06:01 PM
|
#8
|
Elite Member
|
|
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
|
|
Elite Member
Join Date: Aug 2013
Location: Stouchsburg PA
Posts: 5,319
|
I would just replace the muffler and tail pipe and O2 sensors. If that doesn’t solve your problem then replace the CAT. Aftermarket CATs do not last like an OEM one.
When you remove the muffler from the CAT and look in the back of it. As long as the honeycomb isn’t cracked or melted I’d leave it installed.
Exhaust leaks near O2 sensors will mess with the operation of the engine due to reversion.
The rear O2 sensor waveform should never look like the front waveform. It (rear sensor) needs to be lower amplitude and out of phase with the front sensor or it will trigger a P0420 code.
Sent from my iPhone using Tapatalk
|
|
Reply With Quote
|
08-26-2019, 09:37 PM
|
#9
|
|
Elite Member
|
|
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
|
Elite Member
Join Date: Oct 2014
Location: Citrus Heights, California
Age: 36
Posts: 7,337
Real Name: Jerod
|
I've spent a bit of time tracking the rear O2. Sometimes the signal will go flat, and sometimes it gives a waveform. Normally under acceleration or deceleration it will go flat and under cruise it will oscillate, but not in the same 0.0V - 0.9V range like the front.
|
|
Reply With Quote
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|