3vze complete exhaust
03-31-2010, 01:26 PM
#301
Registered User
03-31-2010, 01:36 PM
#302
Registered User
If your CEL is on do you fail the emissions test even if it passes the visual test and sniffs clean? Assuming the intermittant CEL won't fubar the test, they do make O2 simulators to generate the resistance required to placate the ECU. I have not tried one of these so don't take my word for it, but they are supposed to cure CEL's. It would be easy to swap that out prior to your emissions test, then reinstall it.
http://www.amazon.com/Magnum-Adjusta.../dp/B001CZOQKM
http://www.amazon.com/Magnum-Adjusta.../dp/B001CZOQKM
03-31-2010, 01:38 PM
#303
Registered User
To the OP if you put in a high flow cat you will still pass smog and also free up a bit of the bottleneck you have in the stock cat. If you do not, just leave it in and enjoy the sound of the truck as is. Getting rid if the cat and straight piping is pointless I would rather lose 2-3hp and have it then have that power and be doing my part to ruin our environment.
91_TOYOTA_4x4 call Toyota and see what a new O2 is going to cost you...bet its a lot more than $150.
03-31-2010, 01:38 PM
#304
Registered User
Thread Starter
If your CEL is on do you fail the emissions test even if it passes the visual test and sniffs clean? Assuming the intermittant CEL won't fubar the test, they do make O2 simulators to generate the resistance required to placate the ECU. I have not tried one of these so don't take my word for it, but they are supposed to cure CEL's. It would be easy to swap that out prior to your emissions test, then reinstall it.
http://www.amazon.com/Magnum-Adjusta.../dp/B001CZOQKM
http://www.amazon.com/Magnum-Adjusta.../dp/B001CZOQKM
04-01-2010, 05:55 AM
#306
Registered User
Somebody correct me if I am wrong, but isn't the ECU looking for some range of resistance from the O2 sensor? i.e. If the resistance is within the desired range, the CEL stays off. If that is correct, couldn't you add a resistor between the O2 sensor and the ECU in some 'discreet' location to keep the CEL off?
EDIT: Jay, ... ahh yes grasshopper, now I more fully understand... thanks for the education.
EDIT: Jay, ... ahh yes grasshopper, now I more fully understand... thanks for the education.
Last edited by Wrenchinjoe; 04-02-2010 at 11:07 AM.
04-01-2010, 09:38 PM
#307
Contributing Member
Join Date: Feb 2007
Location: maple ridge, British Columbia, Canada
Posts: 9,055
Likes: 0
Received 9 Likes
on
5 Posts
The engine uses the input from the o2 sensor to figure out what fuel adjustments it needs to make. If you throw a resister inline to the ecu then it will get false info.
If its bad, replace it?
If its bad, replace it?
04-01-2010, 09:40 PM
#308
Contributing Member
Join Date: Feb 2007
Location: maple ridge, British Columbia, Canada
Posts: 9,055
Likes: 0
Received 9 Likes
on
5 Posts
Mine too is under the drivers seat on the down pipe. The idea that running with out a cat will kill a pre cat O2 sensor is not correct.
You can get magnaflow high flow cats for $90 that will pass smog (we have the same dyno smog test here) and I have passed with no problems.
You can get magnaflow high flow cats for $90 that will pass smog (we have the same dyno smog test here) and I have passed with no problems.
04-02-2010, 07:05 AM
#309
Registered User
Join Date: Dec 2009
Location: Minnesota, USA
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
Mak - What is the numeric code you are getting? If pre-cat 02, have you checked to see if the continuity is good? Maybe there is a poor contact which would make it intermittent. Maybe its just plain dirty due to carbon build up. Opening your engine a bit more with your headers may have sped this process. If you're short on cash, you could try cleaning the O2 sensor with a product called deep creep which is made by sea foam. I've read this has worked on O2 sensors with limited success, however cleaning an O2 sensor in any way shape or form is usually last resort. Replacement is likely the best option.
For the record my 92 has only the pre-cat however with intake, headers, glass-pack/exhaust I am flowing pretty good and have not yet blown any codes related to O2.
Hope this helps,
Ben
For the record my 92 has only the pre-cat however with intake, headers, glass-pack/exhaust I am flowing pretty good and have not yet blown any codes related to O2.
Hope this helps,
Ben
04-02-2010, 08:36 AM
#310
Registered User
Thread Starter
Mak - What is the numeric code you are getting? If pre-cat 02, have you checked to see if the continuity is good? Maybe there is a poor contact which would make it intermittent. Maybe its just plain dirty due to carbon build up. Opening your engine a bit more with your headers may have sped this process. If you're short on cash, you could try cleaning the O2 sensor with a product called deep creep which is made by sea foam. I've read this has worked on O2 sensors with limited success, however cleaning an O2 sensor in any way shape or form is usually last resort. Replacement is likely the best option.
For the record my 92 has only the pre-cat however with intake, headers, glass-pack/exhaust I am flowing pretty good and have not yet blown any codes related to O2.
Hope this helps,
Ben
For the record my 92 has only the pre-cat however with intake, headers, glass-pack/exhaust I am flowing pretty good and have not yet blown any codes related to O2.
Hope this helps,
Ben
04-02-2010, 08:58 AM
#311
Registered User
Join Date: Dec 2009
Location: Minnesota, USA
Posts: 94
Likes: 0
Received 0 Likes
on
0 Posts
No $h!+.. bummer dude. Do you plan on doing the work yourself? If so, take some pics. I think the timing belts are recommended every 60K or so. Mine isn't due but, I plan to change it anyway before winter (October) when I do most of the seals. I'm very confident you can take this on yourself if you did your own headers.
04-17-2010, 03:22 AM
#313
Registered User
Join Date: Oct 2009
Location: Spring , Tx.
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
I've been reading this thread , getting part number's and such , getting ready to put header's on my 94 4runner. Came up with a different part number than what was posted. New number for the header's I found is THY-505 , from www.dougthorleyheaders.com .. so going to look for gasket set right now .
04-17-2010, 09:07 AM
#314
LDL: I can get ya a way better deal than you will get from their website. and yes, thy-505 is the same kit i got. long tube headers. the kit comes with the 3 gaskets you will need. if you want the phone number to save ya at least $100 lemme know!
04-18-2010, 04:30 AM
#315
Registered User
Join Date: Oct 2009
Location: Spring , Tx.
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Calipatent : Sure , everyone is alway's looking to save some cash, just post it up , or email or private message me : txharley10@hotmail.com
04-26-2010, 02:02 PM
#318
Registered User
lol good news 
dude same with mine, we just had a few hot days and my truck ran so good when it was hot, even though my afm in done lol toyotas must love being cooked
dude same with mine, we just had a few hot days and my truck ran so good when it was hot, even though my afm in done lol toyotas must love being cooked
06-15-2010, 02:39 PM
#319
Registered User
Join Date: Jan 2010
Location: Northwest Arkansas
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
looks great, about to do similar
got Downey headers from ebay (original co-owner sells on there) and rebuilt the 3vze, got tons of time in it but little money 
so i'm trying to do it all when stuff is easier to get to. Got the Heads and lower intake on and about to install the headers, then belts, upper intake, new Optima battery, new cables, new stereo, new spkrs, blah blah blah. Thanks for the helpful info and links.
so i'm trying to do it all when stuff is easier to get to. Got the Heads and lower intake on and about to install the headers, then belts, upper intake, new Optima battery, new cables, new stereo, new spkrs, blah blah blah. Thanks for the helpful info and links.
