sgkent
Lawn Addict
- Joined
- Sep 27, 2017
- Threads
- 33
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- 1,695
with EFI there are usually temperature sensors that send some kind of signal to the ECU. Sometimes those sensors are grounded into the block, and they can get corrosion in them, or go bad. When they do, depending what the ECU is programed to do, it can add too much fuel or cut back on it, or even go into a limp mode. I think the first thing I would look for is a manual on the EFI system and how to troubleshoot it. Without that, you are just wasting your time looking for the cause, and it will get expensive throwing parts at it. An inductive timing light across a plug wire if it is exposed would probably fire the strobe. If you can set it close to you and pull the trigger when it is running badly you can check each plug to see if it is sparking. Personally I would have replaced the plugs if there was corrosion on them. Also inspect the engine housing to be sure it is spotless. That can also throw EFI temperature readings off. The last thing would be to look for a NOID light that fits the injector harness. They you can test to see if the injector is getting a signal. Another possibility is an injector that is sticky. Maybe add a can of fuel injector cleaner to see if that helps, whatever the MANUFACTURER recommends. I would guess Techron or some derivative of it but I don't know for sure. Sometimes with EFI systems a smoke test helps if there are any vacuum leaks. It is the plethora of sensors that will require a manual.