I was looking into buying this 91 sonoma with the TBI 4.3 engine. I had it running for about 5 minutes while I was inspecting everything, and then the service light came on. So I checked for codes and got none. Turned the car back on, light came back on a couple minutes later. Gauges read fine, no leaks, idle, or acceleration problems. I have the same problem with my 92 except it does have a problem every now and then. What could this be on this truck?
How did you check the codes? Did you do it the voodoo way, or use an actual code reader? For years I've used the voodoo way. There are multiple ways to do this, and it depends upon the car. For example, in my town and country, I have to push and hold the two trip buttons on the dash while turning the key to accessory, and after five seconds let go. Then it shows me the codes where the mileage should be. With other cars, the check engine light can blink out in morse code, etc. The trouble is, this isn't a sure-fire way to get all codes. Some codes can't be expressed this way, depending. A month ago my check engine light came on, and the voodoo method of checking codes didn't work - it said there were no codes. So I had to borrow a code reader from a friend. Sure enough, it was an oxygen sensor gripe. Most auto parts stores will check your codes for free. Good luck!
I never heard of such possibility of growing cactus in water. I lived in Tucson for 12 years and saw many cacti that died for having too much water.
Your reader may not be compatible with what code the pcm is throwing.
