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Please can anyone help? I need to replace the MAP sensor but dont have a clue where it is? Do I have to take the plate off underneath the car to access it? Appreciate any help/suggestions/pics. Thanks
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Can you supply the engine type/code.Normally 3 letters .Can be found on the engine cam cover,the front page of the owners manual,or on a white label in the spare wheel well.
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Why does it need to be replaced?
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Cos it says so on the £20 scanner.(or googlefix)Got to be right,innit.???? Agreed,my thoughts exactly.
Edited by elekie&a/c doctor on 17/04/2016 at 11:03
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Of course there can't be any possibility of a loss of airflow or turbo boost pressure. As always the sensor must be faulty because the scantool says so.
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I will tell you my sorry tale... my car originally started going into limp mode due to the DPF light and I panicked and took my car to the first flashy/all singing all dancing website garage which does a DPF removal and remap. This garage did the job but said my turbo was shot and quoted me a ridiculous price to get it sorted. They said the car was unsafe to drive but I didnt have the £1100 to pay for a turbo after the £510 I paid for the DPF fix. I have since had the turbo replaced alot cheaper but the lad said the map is wrong and its letting too much fuel through which is why the exhaust is smoking alot. He said to go back. So I did and they were pretty rude and said its nothing to do with the map. So I got a second opinion from another garage who put it on the dyno and its only running at around 150 bhp but he said that the manifold absolute pressure looks like its out as the temp is constantly around 50. Does that make sense? He says to replace that and it should be problem solved. I dont want to fork out if I can avoid it so just wondered if its a job I could do? Appreciate your help
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My point is that the MAP sensor itself might well not be what the problem is. To put simply, the MAP sensor could be giving the ECM false information, or it could be giving the ECM the correct information of what's actually happening. The ECM cannot tell the difference. It only knows, and acts on what it's being told.
Here's an example. If your air intake system was blocked, even only partially, then airflow would be restricted. Turbo boost pressure would then be lower than it should be. The ECM would then fuel the engine accordingly. If the restriction was severe enough the MAP sensor signal may go outside of what the ECM expects to receive from it, and a fault code relating to the MAP sensor will be set. Along will come Mr Tech with his scantool and read the fault code which says MAP sensor implausible signal or something similar, and he assumes the sensor must be the problem whilst ignoring or overlooking everything that might cause it. If course the sensor could be the problem, but then again it might not be. The sensor needs to be tested, and so does the actual airflow and turbo boost pressure.
Sticking EGR valve, intake air leaks, blocked exhaust or EGR pipe, sticking turbo vanes, loss of cylinder compression, dirty or restricted air filter or faulty Mass Airflow Sensor could be your problem.
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I have to be honest. I do not not know a great deal about cars but I do know that I have forked out a hell of alot of money on my car recently. I understand that it could be a number of things. Its just that I was advised that it could be the sensor. I was kind of hoping that it might be the cheapest fix on the list and if I could locate it then I could change it myself. I was told that sometimes the wires might be damaged due to the age of the car?
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Diesel engines are dirty oil burners, and it's not at all unusual or uncommon for engines of an age such as yours to have the air intake lined with thick oily sludge. It's a mix of engine oil and exhaust gasses from the EGR system. If this describes your engine then it would benefit from a thorough clean. This is not an easy five minute job though, and there's no substitute for disassembly and manual cleaning. I find a 50/50 mix of Heavy Duty TFR and water works best. Scrape all the worst off first and then let the manifold soak in a bucket of the solution for about 24 hours. Dry thoroughly before reassembly.
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BMN
LS7Z DA is what it says for identification letters Engine/Gearbox/Finishes
Cheers
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The map sensor on these is a dual function device.It reads air temp and inlet absolute pressure.So we need to know what is the "50" reading.The map sensor on these is usually in the turbo intake pipework,could be low down at the front.
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Can this be reached in the normal way or do you have to go in underneath? I have tried finding diagrams etc online or a guide on utube but cannot find anything?
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I think I will just have to bite the bullet and take it in to get the sensor done. Cheers for your replies to possible causes as I might get these checked if not the sensor. I dont have the 'know how' on cars unfortunately to sort things myself and cause bigger problems. Looks like my wallet is going to take another hammering! I do like my car though but might be a sign to update! Will keep you posted. Cheers
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