I seem to have solved the Code 18 and Code 17 issues I had with my '93 Buick LeSabre. I switched out the coils, wires, and plugs and it ran great for a couple of weeks. Then I had a new issue
One day I drove to a nearby city and stopped and started the car several times without issues. I came home and had to go back out about an hour later to pick up something at a shop. When I came out of the shop the car would crank but did not want to start. I cut the switch off and tried again and after a few rounds of the engine it fired but was running rough. I managed to drive it home but at idle the idle was rough; it was hard to tell if it was missing or not. The next day I decided to change the fuel filter since I had one but had never installed it due to the fact it is burried under the car and you have to jack the front end up and crawl in under the side of the car. What a stupid location for a fuel filter. After changing the fuel filter, the car appeared to run fine. However, that was short lived.
The rough idle came back. Then it left again and ran fine for a few days. Then it came back and I had to drive it 18 miles to work and then back and it ran rough the whole time, a rough idle and I could feel it even when traveling down the road at 50 to 60 miles an hour. At one time yesterday on the way home it stopped once, only to reappear. Today it was idling rough when I pulled it into the shed. Then I started the car again to move it a bit further in the shed and it was idling smooth.
I don't think it is a ignition problem; although it might be related to the cheap chinese coils I put on the car. I am thinking it might be the injectors but since it is coming and going, mostly coming now, would it be a failing injector or simply a wiring issue?
I am not familar with injector failure. I do add injector clearner to the fuel at regular times because I have heard of problems with ethanol gasolines (which is becoming impossible not to run since it basically increases fuel consumption; however, that is another rant for another day). What I am looking for is some feedback on what/how to dignose this issue. Oh, no check engine lights, no codes stored in the computer. I don't have a way at this time to record any real time data
since my brother-in-law gave away the scan tool I borrowed the last time.