Daves99 Posted August 10, 2022 Share Posted August 10, 2022 I had a problem with diesel smoke from the exhaust at idle when warm. I had my injectors tested and 2 failed the test, these have been replaced and coded in but I now have a rough spot at 1500 that wasn't there before. Any ideas? Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 10, 2022 Author Share Posted August 10, 2022 Also it is showing no fault codes Quote Link to comment Share on other sites More sharing options...
unofix Posted August 10, 2022 Share Posted August 10, 2022 I suspect that possibly the wrong number injectors have been coded, a common mistake. The cylinder number order, the firing order, and the injector number is nearly always in a different order. Use FORScan to monitor the injectors and disconnect one at a time to check which number they are. Then recode them if there are any that are wrong. 1 Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 11, 2022 Author Share Posted August 11, 2022 I have triple checked the coding on them but I will give it a try. Thank you Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 11, 2022 Author Share Posted August 11, 2022 I was told by someone that I should replace all 4 injectors but I didn't know if this was necessary due to 2 of them testing ok Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 12, 2022 Author Share Posted August 12, 2022 The coding is correct on the injectors. Any other ideas anyone Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 13, 2022 Author Share Posted August 13, 2022 What are peoples thoughts on recon injectors for this engine Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted August 13, 2022 Share Posted August 13, 2022 The PCM 'adapts' to new injectors over time. If there are no fault codes and it seems to drive fine I'd give it some time to make corrections. 1 Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 13, 2022 Author Share Posted August 13, 2022 Thank you I will give it a go Quote Link to comment Share on other sites More sharing options...
JW1982 Posted August 14, 2022 Share Posted August 14, 2022 On 8/11/2022 at 10:25 PM, Daves99 said: I was told by someone that I should replace all 4 injectors but I didn't know if this was necessary due to 2 of them testing ok The 2 fuel injectors that tested OK may still be within tolerance but do no longer match their original calibration code. Before changing the injectors this was not a problem since the PCM adapted itself to the injector wear through the Years. By programming 1 or more calibration codes the adaptation is reset. You now have 2 new fuel injectors that perfectly match the calibration code. The 2 existing fuel injectors however do no longer match the calibration code and cause the engine to run rough. The actual calibration code of the existing fuel injectors should be calculated during the injection tests. The obtained calibration code is used to program the PCM instead of the code that is printed on the fuel injectors itself. However very few diesel specialists do actually have the test equipment to calculate calibration codes. This is why many specialists recommend to have all 4 fuel injectors replaced simultaneously. If the existing fuel injectors are still pretty close to the original calibration code you can be lucky. The PCM will adapt itself to the fuel injectors within time. However you should be prepared that the 2 existing fuel injectors will also fail soon. 1 Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 14, 2022 Author Share Posted August 14, 2022 2 hours ago, JW1982 said: The 2 fuel injectors that tested OK may still be within tolerance but do no longer match their original calibration code. Before changing the injectors this was not a problem since the PCM adapted itself to the injector wear through the Years. By programming 1 or more calibration codes the adaptation is reset. You now have 2 new fuel injectors that perfectly match the calibration code. The 2 existing fuel injectors however do no longer match the calibration code and cause the engine to run rough. The actual calibration code of the existing fuel injectors should be calculated during the injection tests. The obtained calibration code is used to program the PCM instead of the code that is printed on the fuel injectors itself. However very few diesel specialists do actually have the test equipment to calculate calibration codes. This is why many specialists recommend to have all 4 fuel injectors replaced simultaneously. If the existing fuel injectors are still pretty close to the original calibration code you can be lucky. The PCM will adapt itself to the fuel injectors within time. However you should be prepared that the 2 existing fuel injectors will also fail soon. Thank you. I thought it might be something like this and have ordered 2 more injectors. Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 18, 2022 Author Share Posted August 18, 2022 I have now replaced all the injectors and the car is running worse and smokes heavily under load. They have been coded in. Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 19, 2022 Author Share Posted August 19, 2022 I have reset the pilot injector values and taking the car for a drive, the car is suffering from a knocking noise that wasn't there before changing the injectors. Does anyone have any ideas on what could be causing this? Thank you Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 21, 2022 Author Share Posted August 21, 2022 On 8/19/2022 at 2:10 PM, Daves99 said: I have reset the pilot injector values and taking the car for a drive, the car is suffering from a knocking noise that wasn't there before changing the injectors. Does anyone have any ideas on what could be causing this? Thank you Anyone? It's still showing no fault codes Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 25, 2022 Author Share Posted August 25, 2022 I have sent the injectors back to be checked and have been informed that they are all sowing signs of damage from possible the pump falling. Has anyone come across this before Quote Link to comment Share on other sites More sharing options...
RSpilla Posted August 26, 2022 Share Posted August 26, 2022 Dont see how they can be damaged, i think they are trying to con you, did you perform the injector relearn process properly after resetting the pilot injection values? I have started a similair thread but i still have the clatter after the process has been completed, there is no smoke in my instance. I dont think there is many people on here who can help us unfortunately. See my thread. Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted August 26, 2022 Share Posted August 26, 2022 Pump failure can send metal shards into the injectors which causes damage. 1 Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 26, 2022 Author Share Posted August 26, 2022 18 minutes ago, TomsFocus said: Pump failure can send metal shards into the injectors which causes damage. I assume that cleaning out all the fuel lines and replacing the pump/damaged injector should solve this, Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted August 26, 2022 Share Posted August 26, 2022 1 minute ago, Daves99 said: I assume that cleaning out all the fuel lines and replacing the pump/damaged injector should solve this, Yes, but the cleaning does need to be incredibly thorough to make sure all traces are removed from the HP side. 1 Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 26, 2022 Author Share Posted August 26, 2022 3 minutes ago, TomsFocus said: Yes, but the cleaning does need to be incredibly thorough to make sure all traces are removed from the HP side. Thank you. I was a bit surprised by them saying that the pump had broken down because it ran fine apart from the odd bit of smoke at idle. Quote Link to comment Share on other sites More sharing options...
RSpilla Posted August 26, 2022 Share Posted August 26, 2022 33 minutes ago, Daves99 said: Thank you. I was a bit surprised by them saying that the pump had broken down because it ran fine apart from the odd bit of smoke at idle. They are having you on IMO, did you perform the relearn procedure after resetting injector values? Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 26, 2022 Author Share Posted August 26, 2022 31 minutes ago, RSpilla said: They are having you on IMO, did you perform the relearn procedure after resetting injector values? The relearn was performed Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 26, 2022 Author Share Posted August 26, 2022 8 hours ago, RSpilla said: They are having you on IMO, did you perform the relearn procedure after resetting injector values? I'm thinking the same Quote Link to comment Share on other sites More sharing options...
Daves99 Posted August 28, 2022 Author Share Posted August 28, 2022 Has anyone had any luck with fitting a 2nd hand fuel pump or is it just false economy Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted August 28, 2022 Share Posted August 28, 2022 If you're taking it off a running car at a breakers yard then it should be fine. But I wouldn't buy one that's been stored empty in a damp shed. Same goes for used injectors. 1 Quote Link to comment Share on other sites More sharing options...
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