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| 02:21 AM | ||
| Users Online Now: 1,277 (Who's On?) | Visitors Today: 95,050 | |
| Pageviews Today: 174,076 | Threads Today: 69 | Posts Today: 1,273 |
| 02:21 AM | ||
i have car trouble help | |
bill shitters 1.2 (OP) User ID: 55386898  United Kingdom04/15/2014 09:16 PM Report Abusive Post Report Copyright Violation | Diesel's, especially when they have a turbo, do not have vacuum. They have positive air pressure or rather boost. That being said, a leak is a leak and will cause issues. An air leak could cause multiple sensors to fault, without knowing which sensors are giving you faults it's hard to say if they're related or not. Quoting: Sol Neman Many diesels do have a vacuum pump that is run off the crankshaft like your power steering, alternator, etc. You may be having issues with the vacuum pump and associated lines. You did mention EGR (exhaust gas recirculation) which is only supposed to recirculate exhaust into the intake above a set RPM. That set RPM should be above 1600 RPM you mentioned where the problem goes away. Without knowing exact specs for your car I can't say for sure. The EGR may be vacuum operated and there could be a leak between that and the vacuum pump. That, however, probably wouldn't cause an issue with power because if the EGR wasn't getting the vacuum needed to open, due to a leak, it would remain closed and not cause any power issues. Based on you mentioning loss of power and an EGR code that leads me to believe the EGR valve is stuck open. Therefore exhaust gas is being allowed into the intake when it shouldn't. This will definitely cause a loss of power since the air/fuel mixture is not ideal. There could be multiple reasons and EGR gets stuck open, but based on the vacuum codes my guess would be there is some kind of shut off valve, electronic most likely, between your vacuum pump and the EGR, that is stuck in the open position, allowing vacuum to the EGR constantly, regardless of RPM. Could be a broken or lose electrical connection to said valve or the valve itself is froze open. mine has the new fangled vgt which Citroen made vacume controlled. its still drives well bit just notice that in 3rd gear it used to pull like a train and now I can feel the turbo boost as the rpm climbs My recommendation is take it to a qualified mechanic to troubleshoot. The retired thread killer Still the killa of threads we come in peace shoot to kill [link to au.youtube.com] I can not talk TO aliens but do listen to the anally probed |
| bill shitters 1.2 (OP) User ID: 55386898 United Kingdom04/15/2014 09:20 PM Report Abusive Post Report Copyright Violation | it might be a new problem or related to first but when the tank is full it has more verve but as tank gets empty not so and some times feels like is missing a beat on the idle The retired thread killer Still the killa of threads we come in peace shoot to kill [link to au.youtube.com] I can not talk TO aliens but do listen to the anally probed |
| Sol Neman User ID: 54563708  United States04/15/2014 09:29 PM Report Abusive Post Report Copyright Violation | Diesel's, especially when they have a turbo, do not have vacuum. They have positive air pressure or rather boost. That being said, a leak is a leak and will cause issues. An air leak could cause multiple sensors to fault, without knowing which sensors are giving you faults it's hard to say if they're related or not. Quoting: Sol Neman Many diesels do have a vacuum pump that is run off the crankshaft like your power steering, alternator, etc. You may be having issues with the vacuum pump and associated lines. You did mention EGR (exhaust gas recirculation) which is only supposed to recirculate exhaust into the intake above a set RPM. That set RPM should be above 1600 RPM you mentioned where the problem goes away. Without knowing exact specs for your car I can't say for sure. The EGR may be vacuum operated and there could be a leak between that and the vacuum pump. That, however, probably wouldn't cause an issue with power because if the EGR wasn't getting the vacuum needed to open, due to a leak, it would remain closed and not cause any power issues. Based on you mentioning loss of power and an EGR code that leads me to believe the EGR valve is stuck open. Therefore exhaust gas is being allowed into the intake when it shouldn't. This will definitely cause a loss of power since the air/fuel mixture is not ideal. There could be multiple reasons and EGR gets stuck open, but based on the vacuum codes my guess would be there is some kind of shut off valve, electronic most likely, between your vacuum pump and the EGR, that is stuck in the open position, allowing vacuum to the EGR constantly, regardless of RPM. Could be a broken or lose electrical connection to said valve or the valve itself is froze open. My recommendation is take it to a qualified mechanic to troubleshoot. mine has the new fangled vgt which Citroen made vacume controlled. its still drives well bit just notice that in 3rd gear it used to pull like a train and now I can feel the turbo boost as the rpm climbs Could be similar issue, except instead of EGR valve, insert Turbo, which would also require a vacuum signal from the pump to adjust the pitch of the turbo vanes. If there's a leak, the turbo may not be getting enough vacuum to adjust the vanes so turbo spools up quicker. If the turbo is getting too much/little vacuum, due to faulty solenoid that's stuck open/closed which controls the vacuum signal that could cause the same issue. I understand the concept of the variable boost your car has, I just don't know if more vacuum or less vacuum that causes the turbo to spool faster at lower RPM's. Normally I'd say listen for a whistle sound with hood (you may call it a bonnet) open, but since you have a turbo, that whistles normally, it'll be difficult to hear the leak. For basic troubleshooting I'd say to look at the vacuum lines between the turbo and vacuum pump, make sure they are connected, no cracks, etc. If you see a vacuum line rubbing up against a hard surface that may be your culprit. You'll also want to look for the solenoid/valve that controls the vacuum signal to the turbo and make sure the electrical connection is good. If all that looks good you're back to taking it to a mechanic. Educate and inform the whole mass of the people...They are the only sure reliance for the preservation of our liberty ~ Thomas Jefferson |
| Anonymous Coward User ID: 56862549 United States04/15/2014 09:43 PM Report Abusive Post Report Copyright Violation | |
| Anonymous Coward User ID: 56862549 United States04/15/2014 09:44 PM Report Abusive Post Report Copyright Violation | |
