94 22RE, Diag. Code 25, Hesitation, Depth of Computer Diagnostic Through Connector - Toyota Nation Forum : Toyota Car and Truck Forums


» Auto Insurance
» Featured Product
Advertisement
» Wheel & Tire Center

Go Back   Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Truck, SUV and Van Forums > Hilux (Pickup) Forum > 89-95 Toyota Pickup/Hilux

89-95 Toyota Pickup/Hilux Discussion forum for the 89-95 Toyota Pickup/Hilux owners. NEW!

ToyotaNation.com is the premier Toyota Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-31-2007, 06:31 PM   #1 (permalink)
New TN User
 
Join Date: Mar 2006
Location: South Easton, MA
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View Sour Kraut's Photo Gallery
94 22RE, Diag. Code 25, Hesitation, Depth of Computer Diagnostic Through Connector

94 22RE, Diag. Code 25, Hesitation, Depth of Computer Diagnostic Through Connector

I have a 94 2WD with a 22RE, 5 speed, and 218,000 miles on it. I am having drivability issues as well as a persistent check engine light that shows a code 25, air fuel ratio lean.

I was having severe hesitation problems at low RPMs after running until warm then shutting off the engine for even a few minutes and starting it again. It felt like it wasn't running on all cylinders and would sometimes stall. The lower the temperature the worse it got.

I took it to a Computer Diagnostic shop that supposedly could plug into the trucks diagnostic connector and evaluate it deeper than just the generalized code 25.
They concluded that the EGR valve was bad, that the throttle body needed cleaning, that there was a slight leak in the number four cylinder intake manifold (they said the manifold might be cracked, “this engine has had problems with that”), and that the fuel filter might need replacing even tough it wasn’t showing a problem it is the original. Estimated parts and labor $685 less the replacement of the intake manifold with the pretend crack.

The intake manifold is probably a product of my foray into the world of high finance two years ago when I had the distinct honor of being allowed to contribute to the building of an additional wing of a local Toyota dealership when my timing chain had to be replaced ... $2000. Six months later I was back to get the exhaust manifold bolts re-tightened. (When doing expensive, shoddy work, why discriminate against the intake manifold?)

I took the Diagnostic shops advice and replaced the EGR valve & gasket with a new one from AutoZone, $140. The old EGR valve seemed to leak a little when I blew into it.
I sprayed the hell out of the throttle body with some cleaner, didn’t use the toothbrush however. I found that the intake manifold bolts were a little loose & I tightened a couple of them. I’ll do the rest later with a torque wrench. Possibly this is the source of the “crack”.

At first this really seemed to do the trick. The hesitation was completely gone, my check engine light stayed out and my gas mileage improved three or four mpg.
After about 4 days the check engine light came back on. The hesitation is much better but the weather is warmer now, and the gas mileage is now only about 2 mpg better.

Recently when I flipped the cap on the trucks diagnostic connector I found that the grease over the connection points was not disturbed. I don’t think the last place I went to plugged any thing into it.

Are advanced diagnostics available for this truck plugging an analyzer into the Diagnostic Connector? Can they get more information at that connector than just an error code?

What kind of info is available through the diagnostic plug in?

Could the oxygen sensor be causing this code? How can I check it without replacing it?
Sour Kraut is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-01-2007, 07:36 AM   #2 (permalink)
One with the force
 
Join Date: Oct 2005
Location: Massachusetts
Posts: 1,472
Thanks: 0
Thanked 2 Times in 2 Posts
iTrader Score: 1 reviews
View maxpower_hd's Photo Gallery
This link is from the free online manials at the top of this section for future reference. It is actually for a 93 but it is the same thing.

http://personal.utulsa.edu/~nathan-buchanan/93fsm

Go to the MFI System section. There is a section there that explains how to test the O2 sensor. It is a simple ohm meter test.

I do not believe there are any "advanced diagnostic tests" for these vehicles. That would be more like the OBDII systems. These just give the codes that you compare to a list in the service manua', as far as I know.
__________________
"The normal make a living. The deranged make history." -Christopher Titus
maxpower_hd is offline   Reply With Quote
Old 06-01-2007, 08:43 AM   #3 (permalink)
Languishing in Virginia
 
TNRabbit's Avatar
 
Join Date: Apr 2006
Location: TN Native in Virginia
Posts: 2,026
Gameroom cash: $305760
Thanks: 6
Thanked 62 Times in 61 Posts
iTrader Score: 0 reviews
View TNRabbit's Photo Gallery
Your problem sounds like it might be a vacuum leak or a leak in the intake tube between the VAFM & throttle body.
__________________
TNRabbit
STOCK '94 DLX XtraCab 4x4, 5 spd, 3VZE, 270,000 mi.


TNRabbit is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Truck, SUV and Van Forums > Hilux (Pickup) Forum > 89-95 Toyota Pickup/Hilux

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
94 4cyl code 25 and 26 running rough all the time toddf 3rd & 4th Generation (1992–1996 & 1997–2001) 11 04-26-2007 07:37 PM
Help! 22RE: failed smog & code 25 Reefcrack Pre-88 Toyota Pickup/Hilux 3 01-05-2007 11:02 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 02:27 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.