94 Toyota 4WD - Code 71 / Code 25
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94 Toyota 4WD - Code 71 / Code 25
I have a 94 toyota p/u 4WD with a 22re . Truck has about 85k miles. I have owned this truck for about 6 months. This is first Yota I have owned, and I love it.
Lately, I have been getting a code 71. I clear the code (reset the computer), and a couple of weeks later, code 71 again.
I know code 71 is the EGR system probably. Maybe a vacuum leak, stuck valve, etc. etc. etc.
I still have not had a chance to take the problem to a mechanic, and after weeks of blowing the 71 off, I have now gotten code 25. I believe this is a lean condition.
This last week I have noticed that the engine temp has been going up significantly when I stop at a light, or when I drive at low speeds for extended times. Once I take off and get on the highway, my temp goes back to normal.
I recently replaced Thermostat, Hoses, Radiator, WaterPump.
I also just put in a new O2 sensor (because the wires appeared to be fried on the last one).
Before I haul this thing into a shop, are there any easy things I can do to isolate and fix the problem?
This has been somewhat of a project truck for me, and I am definitely not mechanically inclined. However, I really want to learn about this truck and do as much maintenance on my own as possible.
On a scale of 1 to 10 I'm about a 3.5 when it comes to mechanics. But like I said, I'm eager to try anything on my own before wheeling it into the shop.
Any advice would be greatly appreaciated.
Thanks.,
MM
Lately, I have been getting a code 71. I clear the code (reset the computer), and a couple of weeks later, code 71 again.
I know code 71 is the EGR system probably. Maybe a vacuum leak, stuck valve, etc. etc. etc.
I still have not had a chance to take the problem to a mechanic, and after weeks of blowing the 71 off, I have now gotten code 25. I believe this is a lean condition.
This last week I have noticed that the engine temp has been going up significantly when I stop at a light, or when I drive at low speeds for extended times. Once I take off and get on the highway, my temp goes back to normal.
I recently replaced Thermostat, Hoses, Radiator, WaterPump.
I also just put in a new O2 sensor (because the wires appeared to be fried on the last one).
Before I haul this thing into a shop, are there any easy things I can do to isolate and fix the problem?
This has been somewhat of a project truck for me, and I am definitely not mechanically inclined. However, I really want to learn about this truck and do as much maintenance on my own as possible.
On a scale of 1 to 10 I'm about a 3.5 when it comes to mechanics. But like I said, I'm eager to try anything on my own before wheeling it into the shop.
Any advice would be greatly appreaciated.
Thanks.,
MM
#2
25
AIR/FUEL RATIO LEAN INDICATOR--LEAN SIGNAL SENT TO ECU FROM O2 SENSOR
--INJECTOR FAULT(S)
--FUEL PRESSURE
--OXYGEN SENSOR
--AIRFLOW METER OR MAP SENSOR
--IGNITION
--ECU
Here are the code possibilities for a code 25. Check fuel pressure. A clogged filter or weak pump will make it run lean,, lean = hot.
Mike in AR
Edit -- it's almost NEVER the ECU ( according to the conventional wisdom found here )
AIR/FUEL RATIO LEAN INDICATOR--LEAN SIGNAL SENT TO ECU FROM O2 SENSOR
--INJECTOR FAULT(S)
--FUEL PRESSURE
--OXYGEN SENSOR
--AIRFLOW METER OR MAP SENSOR
--IGNITION
--ECU
Here are the code possibilities for a code 25. Check fuel pressure. A clogged filter or weak pump will make it run lean,, lean = hot.
Mike in AR
Edit -- it's almost NEVER the ECU ( according to the conventional wisdom found here )
Last edited by regularguy412; 02-22-2006 at 05:23 PM.
#4
I was on the way to the river today and i threw a code 71 so im trying to figure out myself.
Will this hurt my truck in the long run? Stuff like that. Let me know what you figure out.
Will this hurt my truck in the long run? Stuff like that. Let me know what you figure out.
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