Questions about 93 22re

[Jamerson84]

I just have a few questions about a couple things that have been bothering me. I have a 93 pickup 22re that used to be my Grand fathers so the truck only has 58k miles. It's had a lot of 4 mile round trips and never got out of 3rd gear alot so I've already had to change the timing chain (the guides were gone). Anyway when I restart it after it's warmed up sometimes the engine clunks and idles low until I rev it a little then it go's back to normal. I'm worried that this could damege the new timing chain. Should this engine be reving up slightly and then idling back down when restarted like other efi engines? I've seen problems like this on this board before and people have suggested that it could be dirty injectors but i just thought I would ask anyways.
Also I'm running a purelater pureone and I was just wondering how it stacked up to the OEM filter becouse if need be I'll make the switch.

Thanks in advance.

[Sidney]

The oxygen sensor is replaced for free in the USA only when the vehicle reaches it's first 80 000 miles regardless of the age & number of owners as stated in the factory owner's manual in the maintenance section,some Toyota dealerships are reluctant to replace it for free if that happens contact the Toyota regional head office for your region where they will give your local dealership 48 hours to comply.
On average the oxygen sensors should be replaced every 6 years or 100 000 miles or so which ever comes first as stated in the owner's manual,warranty booklet and factory service manual.

Symptoms of a bad o2 sensor are poor gas mileage,hesistation in acceleration,worse emmissions,and in severe cases after the stat opens the engine can no longer maintain stable 750 rpm (with manual 5 spd tranny) idle and the engine begins to stall.
The 02 sensor is designed to function once the vehicle has warmed up which is about after 10 minutes where the thermostat begins to open at 190 or 195 degrees Ferenheit depending on thermostat then the vehicles ECU system enters what they call a "closed loop system" then the exhaust manifold's temperature reaches 400 degree Ferenheit (I think)that's where the sensor starts to do it's job which is usually when the thermostat first opens up then the oxygen sensor senses the ratio of air to fuel and sends a signal back to the ECU then ECU compensates by increasing or decrease the open time for the fuel injectors to pump fuel.So usually the problem of stalling shows up after about 10 minutes of driving or so.many folks think that the o2 sensor is bad but an exhaust leak can cause excess oxygen to enter the exhaust system thereby fooling the sensor into thinking there is too much oxygen,there are other problems that could cause it to give false reading such as a vaccuum leak.

If you discover that the o2 sensor is bad and it is not under warranty then from my/others experience/research purchase an o2 sensor in the following order:

1)Toyota (NipponDenso now called Denso)
2)Denso aftermarket (Same as original but sold aftermarket)
3)NTK (oxygen sensor division of NGK)

Available at:

http://www.1sttoyotaparts.com/partscat.html (10% shipping by Fed Ex or free shipping with $100 & over speak to Roger at 1-888-271-3948
http://www.Toyotaparts4U.com
http://www.toyotaofplano.com
http://www.densoaftermarket.com
http://www.ngksparkplugs.com

Sidney® ™
Repairs tv's,vcr's,home/car audio out of my home
E-mail:sidneybek@yahoo.com
Dartmouth,Nova Scotia
Canada
1985 Toyota 4-Runner,solid front straight axle,factory cruise control,sunroof,22R-E,W56,RN60LV-MSEK,rusted rear step/towing chrome bumper with 244 000 KM

[Jamerson84]

Thanks for the info I was never quite sure what the o2 sensor did. Is there anyway to check one? This also could be a problem with another truck that I work on.

[Sidney]

The target air fuel ratio of 14.7 to 1 (stoichiometric) is achieved by adjusting injection duration. Injection duration is the sum of the preprogrammed basic injection time plus corrections. If no correction is needed the voltage signal from the O2 sensor should be 2.5 volts. The voltage across the sensor varies with the oxygen content of the exhaust. Voltage higher than 2.5 volts (up to 5 volts) indicates that the ECU is decreasing fuel (shortening the injection duration) to correct for a rich condition and voltage less than 2.5 volts indicates the ECU is increasing fuel (increasing injection duration) to correct for a lean condition. Things that can cause a rich condition are ignition misfire, high fuel pressure, etc. Things that can cause a lean condition are worn TPS shaft, vacuum leaks, low fuel pressure, etc. The ability of the system to adjust itself based on sensor feedback is called a closed loop system. The closed loop mode only operates when the engine is at operating temperature and the IDL contacts are off (throttle open).

To test the system you need a voltmeter and 5-kohm resistor and make some spade type jumpers. Short out T and E1 and read the codes first. Fix any problem indicated by the codes then clear the codes by removing the EFI fuse for a minute. Warm up the engine and connect a voltmeter to Vf and E1. Run the engine at 2,500 RPM for at least 2 minutes. Perform all the tests with the engine running at 2,500 RPM. Short out terminals T and E1. Count the number of voltage pulses in 10 seconds.

Six or more pulses: System tests normal. Now unshort the T and E1 terminals and measure the voltage. A reading around 2.5 volts means everything is normal. A reading high or low means something might be wrong other than the EFI system that is effecting the A/F ratio.
Less than 6 pulses: Unshort the T and E1 terminals and measure voltage. If you get any voltage replace the O2 sensor. Pull off the PCV hose and measure voltage. If still you get 0 volts replace the O2 sensor. If you get more than 0 volts you have something causing an over rich condition. O2 sensor is working normal.

No pulses: Unshort the T and E1 terminals and measure voltage. If you get 0 volts then pull off the PCV hose and measure voltage. If you still get 0 volts replace the O2 sensor. If you get more than 0 volts you have something causing an over rich condition. O2 sensor is working normal. After unshorting the T and E1 terminals you get more than 0 volts disconnect the water temperature sensor and connect a 5-kohm resistor across the connector. Measure voltage. If you get 0 volts replace the O2 sensor. If you get 5 volts or close something in the engine is causing an over lean condition. O2 sensor is working normal.

Any Public Library in your area would have the Factory service manual,Haynes,Chiltons,Mitchells,Clymers,Bentley and Toyota repair books.

There is also free AutoZone service manuals at:

http://www1.autozone.com/servlet/UiB...pair_guide.jsp

For scanned pages of factory service manuals for other engines:

http://www.brian894x4.com/Scannedmanual.html
http://home.swiftdsl.com.au/~scorp/surf/1KZ-TE.pdf
http://www.showmesome.info/hilux/info/manuals/1KZ-TE
http://surf.mactherapy.com/1KZ-TE.pdf
http://surf.mactherapy.com/parts/
http://www.spyderchat.com/1zzfe.pdf
http://files.matrixvibe.net/docs/1zzfe.pdf
http://landcruiser.free.fr/mans/
http://surf.mactherapy.com
http://www.turbosupras.com/pages/technical/tsrm.htm
http://www.lieblweb.com/tacoma/Mecha...rams/index.htm
http://perso.wanadoo.fr/adherence.4x...techniques.htm
http://perso.wanadoo.fr/adherence.4x4/index.htm
http://www.asatraction4x4.cl/html/
http://www.toyotasurf.asn.au/techsite/downloads.htm
http://www.grubinski.com/grubinski/a...oyota.manuals/
http://www.carsoft.ru/files/4runner95di.exe
http://www.hotrodder.com/kwkride/tech.html
http://www.autoshop101.com/autoshop15.html
http://www.mtv411.com/sitemap.htm

1993 Toyota Pickup Service Manual:
http://personal.utulsa.edu/~nathan-buchanan/93fsm/

2003 (2001-2004) Toyota Tacoma Factory Service Manual:

http://fsm.afraid.org/
http://www.junglecode.com/toyota/tacoma/2003_fsm/
http://65.200.1.6/FSM/

FSM (factory service manual)can be acquired in several ways:

Toyota Material Distribution Center
750 West Victoria St
Rancho Dominguez/Compton,CA 90220-5538
USA
Ph:1-800-622-2033 (outside CA)(M-F: 7-5 PST)
Ph:1-800-443-7656 (inside CA)
Ph:1-310-818-4630 (in or outside CA)
Speak to Beverly or Deloris
http://techinfo.toyota.com/public/main/mdc.html
http://www.4crawler.com/4x4/FSM.shtml

1)buy a used one off e-bay
2)some Toyota dealerships may give you one or sell it for $10-20 (used) as most Toyota dealerships don't repair many old Toyotas and no longer need the service manual
3)some public libraries sell their old books as they are not in demand any longer
4)some free buy & sell classified papers,websites and bulletin boards may have some used ones for sale
5)some junk yards may have one laying around
6)some Toyota specialty garages may have one laying around and no longer use it as the vehicle may be too old and those mechanics probably have so much experience that they could publish their own factory service manual with corrections and "real world repair tips"
7)if someone has the FSM maybe they could scan all of the pages and post it on a site for all of us to download or view.

Sidney® ™
Repairs tv's,vcr's,home/car audio out of my home
E-mail:sidneybek@yahoo.com
Dartmouth,Nova Scotia
Canada
1985 Toyota 4-Runner,solid front straight axle,factory cruise control,sunroof,22R-E,W56,RN60LV-MSEK,rusted rear step/towing chrome bumper with 244 000 KM

[qsd-dan]

Usually idle issues are either due to a TPS (throttle position sensor) out of spec and/or a dirty throttle body. To check and adjust the tps, go here

http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml


As for cleaning the throttle body, I'm not sure how much experience you have on these motors, so I'll try to keep it simple. If I offend you due to my simple explanations, I appoligize in advance.

There is a large intake hose going from the air filter housing to a chunk of metal called a throttle body. You only need to remove the end going to the throttle body itself. once you have removed the intake hose, poke your finger around the left side of the throttle body and you should feel a few (2 or 3) small orfices around there. These lead to the air valve which allows extra air to enter the throttle body to slightly increase the idle when the motor is cold. It also controls the amount of air for the idle itself as well. These orfices get clogged over time from accumulated dirt that happened to pass the air filter as well as blow-by vapors from the crankcase.

Get a can of throttle body cleaner from the auto parts store that is oxygen sensor and catalytic converter safe. Remove the hose leading from the thottle body to the air valve. You don't want the cleaner getting in there and shorting out the air valve.

Give all of those orfices a good shot of cleaner and make sure they are free and clear. While you're at it, get a clean rag, liberaly shoot cleaner on it, open the throttle all the way and clean on and around the butterfly valve. You should get a bunch of black crap on the rag. Keep at it until it's clean. Hook everything back up in reverse and you're done.

After the cleaning, your idle may go much higher than before because you have now opened or unplugged the orffices. This is normal. Just adjust the idle back down.

[Jamerson84]

Cool thanks. I'm gonna try some of these tests. I've worked on the engines before and do have a Haynes manual but has far as the EFI systems go I don't have more than a general idea of how it works.
Thanks again.

[95G ATL]

Originally Posted by Sidney

The oxygen sensor is replaced for free in the USA only when the vehicle reaches it's first 80 000 miles regardless of the age & number of owners as stated in the factory owner's manual in the maintenance section,some Toyota dealerships are reluctant to replace it for free if that happens contact the Toyota regional head office for your region where they will give your local dealership 48 hours to comply.

************************************************** *************
*** not to hi-jack this thread, but you have sparked my interest with the 80k miles and O2 sensor. My 1995 Tacoma just hit 80,000 miles this week and BOOM, the Check Engine Light came on. I can almost bet the farm that it is an 80k maintenance thing---believe I read this somewhere.

Anyhow, is this 80k Free O2 sensor thing valid for 1995 tacoma V6's???? where do I find info on it?

Thanks in advance...
-Brian

[95G ATL]

Originally Posted by 95G ATL

************************************************** *************
*** not to hi-jack this thread, but you have sparked my interest with the 80k miles and O2 sensor. My 1995 Tacoma just hit 80,000 miles this week and BOOM, the Check Engine Light came on. I can almost bet the farm that it is an 80k maintenance thing---believe I read this somewhere.

Anyhow, is this 80k Free O2 sensor thing valid for 1995 tacoma V6's???? where do I find info on it?

Thanks in advance...
-Brian

bump....anyone know of the 80k FREE o2 sensor replacement that he spoke about? I have searched and I cannot find.