gas guzzler

i have a 1990 toyota truck 4x4,140000 miles. it doesn't have much power,it uses too much gas and the check engine light comes on once in a while. i had it checked on machine and they say it don't read out any codes. i need help.

 

Couple of questions:

1. Where did you have the codes checked?
2. Have you already done basic tune-up preventive maintenance: Plugs, wires, distributor cap, rotor?
3. How good of mechanical condition is the truck in: Leaks, burning any oil, using oil/coolant?
4. Has the O2 sensor ever been replaced?

 

On the under hood spec decal jump out the terminal that it states for timing check in the check connector. Te and E1 and read the blinks of the check engine lite with the key on.

Is it a 4 or 6?

 

the truck has 140000 miles
it was checked at a garage,not a dealer
it has been tuned-up a few months ago
no oil burning,small leak
o2 sensor has not been changed

 

the engine is a 4 cyl. 22re
i tried the jumper wire, i still could not get any blinks

 

The check engine lite must lite with the key in the on position then follow below:

DIAGNOSTIC TROUBLE CODES
OUTPUT
To obtain an output of diagnostic trouble codes, proceed as
follows:
1. Initial conditions
(a) Battery voltage 11 volts or more.
(b) Throttle valve fully closed (throttle position sensor IDL points
closed).
(c) Transmission in neutral range.
(d) Accessories switched OFF.
(e) Engine at normal operating temperature.
2. Turn the ignition switch ON. Do not start the engine.
3. Using Jumper, connect terminals TE1 and E1 of the DLC1.

HINT: The DLC1 is located near the No. 2 relay block.
4. Read the diagnostic trouble code as indicated by the number
of flashes of the Malfunction Indicator Lamp.
Diagnostic trouble code