ICM(ignition control module) and it's wires were trouble spots on the Lima engines.
But these usually cause CEL to come on, not always just usually.
Never replace, test
Ohm/volt meters are cheaper than pretty much any part
Seafoam in the fuel tank will clean the pintles and needle valves, I run a can in each of my fuel injected engines once a year, I do notice a difference about 1/2 way thru the tank, should probably do it twice a year but I am cheap, lol.
Here's the deal with larger injectors, this isn't the same as a carb with bigger jets.
You do not control how much fuel is mixed with the air, the computer does.
So if you put in larger injectors, nothing changes, injectors are just not open as long as the originals, too large and engine won't idle.
On first start up with larger injectors you will get rough running until engine warms up and O2 sensors come on line, then computer will learn the open/close time for the correct 14:1 fuel ratio for the new injectors, and you will have the same performance as you did with factory injectors.
So, IMO, not worth it unless you can increase air flow with a better CAM, or even a turbo, but stock injectors can handle most larger CAMs and even some lower boost turbos.
MAF(mass air flow) sensor tells the computer how much air is coming in, so this is the main thing the computer uses to set base fuel/air mix.
O2 sensors tell the computer how close it is to 14:1 air/fuel ratio, computer adjusts injector's "open time" to stay at 14:1.
Last edited by RonD; 04-18-2014 at 09:24 PM.