1989 Chevy Cheyenne V8 350

KIRRA24

MEMBER
1989 CHEVROLET CHEYENNE
V8
4WD
AUTOMATIC
200,000 MILES

Hello. I have an 1989 chevy cheyenne 1500 truck. It was driving fine but check engine light kept coming on and going off, so didnt really think nothing of it. So one morning I went to crank her up and she was making the sound as if she wanted to turn on, but she never turned all the way over to the on position (or running). So I had my mechanic come and change the fuel pump, the distrubator, it's cap, the fuel filters, but she still stalls out. An you please tell me what might be wrong with my truck, oh he also said that the spark plugs didnt look like they were firing right, so he's looking at it now. But in the mean time he still hasnt called me to come and pick it up, so im assumimg that its still not working properly and still stalling out. Please help!

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Cross terminals A & B as shown with a piece of wire, PROCEDURES FOR READING GM FLASH CODES 1. Turn the ignition switch ON but do not start the engine. 2. The "CHECK ENGINE" light come on indicating the bulb is working. If the light fails to come on, the bulb may be burned out or there may be a problem in the Check Engine light circuit. 3. Locate the diagnostic connector for the computer. It is usually located under the instrument panel near the steering column. Insert a jumper between the "TEST" and "GROUND" terminals. CAUTION: Refer to a shop manual for the proper terminal locations. Jumping the wrong terminals may cause damage to the computer system! 4. The Check Engine should now flash. The first code should be a code 12 (Flash, Pause, Flash Flash). Code 12 will repeat two times. If any other trouble codes are in the computer's memory, they will be displayed in numerical order starting with the lowest number, and repeat three times. The codes will continue to repeat as long as the test terminal remains grounded. NOTE: BE SURE TO WRITE DOWN ANY CODES THAT ARE PRESENT NOTE: GM may use the same code number for different faults on different models of vehicles. That's why some code numbers list more than one possible cause. 5. To exit diagnostic mode, turn ignition switch off and remove the jumper. HOW TO CLEAR TROUBLE CODES Trouble codes on most older vehicles can be cleared by removing battery voltage from the computer for at least 10 seconds. Make sure the ignition switch is OFF, then remove the computer fuse from the fuse panel. Disconnecting the battery will also work, but doing so will also cause the loss of stored information and presets in other electronic accessories such as the radio, climate control system, memory seats, etc. Disconnecting the battery can also cause the computer to forget long term fuel calibration adjustments, and may affect the operation of an electronic transmission until the computer can "relearn" the shift points. The preferred method of clearing trouble codes is to use a scan tool. Page 1

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