goldfinger
New Member
Hi all,
I have an odd issue with my 2016 289D (TAW05448, ~3700 hours). It has been working fine, but then it wouldn't restart about an hour after its last use. I wasn't present when this happened, but there didn't appear to be any unusual signs. We were able to get it refired, but it idled roughly and wouldn't throttle up fully. However, we were able to get it trailered and back home. Testing showed that injectors 1 and 4 were very low or dead, but there were no codes and nothing showed on ET. I tested compression and it was perfect in all four cylinders. I replaced all four injectors and here's where the fun began:
After a few seconds for the fuel to get through the pipes, it cranked better than it ever has. It ran great for about 30-45 seconds and then it sounded almost like the computer derated the engine. It then started throwing low/no voltage red error codes for injectors 1 & 4. Now, it's back to being hard to start and running rough same as before. And now injectors 1 & 4 are dead again, but this time with the constant error codes. When researching the schematics, I discovered that although 1 & 4 each have their own two pins in parallel for positive from the ECM, they share the same two pins in parallel as the return path. Similarly injectors 2 & 3 share a return path. I have thoroughly tested the harness, and everything seems to be fine there. Pins on the ECM look fine from the outside.
Does this sound like an internal ECM issue?
If so, is there any hope of repairing the ECM?
Are there any other things that could cause this besides the ECM or are there any other troubleshooting steps that would be helpful to rule it out?
What are the odds that all the injectors (old and new) are actually fine or is it possible that an ECM issue, if that is the problem, fried them?
Having likely just wasted money on injectors, I hate to potentially waste more money trying a new ECM and reprogramming if that's not really the issue or if it's repairable. Thanks for any help!
I have an odd issue with my 2016 289D (TAW05448, ~3700 hours). It has been working fine, but then it wouldn't restart about an hour after its last use. I wasn't present when this happened, but there didn't appear to be any unusual signs. We were able to get it refired, but it idled roughly and wouldn't throttle up fully. However, we were able to get it trailered and back home. Testing showed that injectors 1 and 4 were very low or dead, but there were no codes and nothing showed on ET. I tested compression and it was perfect in all four cylinders. I replaced all four injectors and here's where the fun began:
After a few seconds for the fuel to get through the pipes, it cranked better than it ever has. It ran great for about 30-45 seconds and then it sounded almost like the computer derated the engine. It then started throwing low/no voltage red error codes for injectors 1 & 4. Now, it's back to being hard to start and running rough same as before. And now injectors 1 & 4 are dead again, but this time with the constant error codes. When researching the schematics, I discovered that although 1 & 4 each have their own two pins in parallel for positive from the ECM, they share the same two pins in parallel as the return path. Similarly injectors 2 & 3 share a return path. I have thoroughly tested the harness, and everything seems to be fine there. Pins on the ECM look fine from the outside.
Does this sound like an internal ECM issue?
If so, is there any hope of repairing the ECM?
Are there any other things that could cause this besides the ECM or are there any other troubleshooting steps that would be helpful to rule it out?
What are the odds that all the injectors (old and new) are actually fine or is it possible that an ECM issue, if that is the problem, fried them?
Having likely just wasted money on injectors, I hate to potentially waste more money trying a new ECM and reprogramming if that's not really the issue or if it's repairable. Thanks for any help!
