Hi all. I connected Suzuki SDS to my 2008 DF200 and ran the injector-stop/misfire test.
Stopping injectors on cylinders 1, 3 and 5 made no noticeable difference to how the engine ran. Stopping injectors on cylinders 2, 4 and 6 caused a clear drop, so it appears the entire 1-3-5 bank is not contributing properly.
I tested cylinders 1, 3 and 5 with an inline spark tester and the tester flashed on all three cylinders. I then removed the spark plugs. The plugs had a small amount of fuel on them, so fuel appears to be reaching the cylinders. The injectors are new and the injector resistance readings were previously within specification.
The engine starts with some throttle and will continue running, but idle is low at roughly 500–550 rpm. It also struggles under load and will not rev properly. There are no warning alarms or obvious SDS fault codes.
At this stage I appear to have:
My next test will be compression on all six cylinders. Assuming compression is reasonably even, what could cause the whole 1-3-5 bank not to fire properly?
Could this be a shared electrical issue affecting that bank, such as a wiring-harness fault, common power supply, ECU driver, grounding issue, camshaft-position signal, ignition timing issue or incorrect cam timing?
Any suggestions on the most logical tests to carry out next would be appreciated.
Stopping injectors on cylinders 1, 3 and 5 made no noticeable difference to how the engine ran. Stopping injectors on cylinders 2, 4 and 6 caused a clear drop, so it appears the entire 1-3-5 bank is not contributing properly.
I tested cylinders 1, 3 and 5 with an inline spark tester and the tester flashed on all three cylinders. I then removed the spark plugs. The plugs had a small amount of fuel on them, so fuel appears to be reaching the cylinders. The injectors are new and the injector resistance readings were previously within specification.
The engine starts with some throttle and will continue running, but idle is low at roughly 500–550 rpm. It also struggles under load and will not rev properly. There are no warning alarms or obvious SDS fault codes.
At this stage I appear to have:
- Injector operation/fuel reaching cylinders 1, 3 and 5
- Spark visible on an inline tester
- No contribution from the complete 1-3-5 cylinder bank
My next test will be compression on all six cylinders. Assuming compression is reasonably even, what could cause the whole 1-3-5 bank not to fire properly?
Could this be a shared electrical issue affecting that bank, such as a wiring-harness fault, common power supply, ECU driver, grounding issue, camshaft-position signal, ignition timing issue or incorrect cam timing?
Any suggestions on the most logical tests to carry out next would be appreciated.