 | Home > Puma (Tdci) > MAF sensor |
 
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| snowric Member Since: 01 Aug 2011 Location: London Posts: 20   
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Just to give you all full problem. When cold - and of course not always - my defender either does not respond to the throttle for 1-5 seconds and then accelerates or it picks up revs rise them drop and then it works again. I have had codes read and of course nothing came up. My mate at a small garage up the road checked the throttle sensor and map sensor - he said voltages moved up and down “fine” but he doesn’t know transits of defenders.’
Once the car is hot it works fine. One other thought, could it be the turbo actuator. I see when I press the throttle on my drive it engages the turbo but then backs off again. Maybe of course interrelated to MAF sensor. Thanks for your help. Snowy Snowy |
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5th Jan 2019 5:07pm |
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| snowric Member Since: 01 Aug 2011 Location: London Posts: 20
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OK done some reading and now understand that the ECU uses a default map if MAF sensor isn’t attached.... Snowy
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5th Jan 2019 8:24pm |
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| williamthedog Member Since: 29 Dec 2012 Location: south wales Posts: 3441 
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Have a search for vcv valve or egr valve. Either will give those symptoms. Probably vcv.
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5th Jan 2019 8:54pm |
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| snowric Member Since: 01 Aug 2011 Location: London Posts: 20
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Many thanks EGR deleted so will need to change the VCV and dona relearn. Snowy
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5th Jan 2019 8:59pm |
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| Alex L Member Since: 22 Jan 2018 Location: South Northants Posts: 134 
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Mine keeps throwing an engine management light since the remap - bought a code reader and I see its most likely the MAF. Hopefully JE Engineering will be taking a look next week to resolve
 Click image to enlargeUntitled by Alex L, on Flickr |
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5th Jan 2019 9:25pm |
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| kaney Member Since: 01 Oct 2018 Location: Bolton Posts: 232 
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Just to give you all full problem. When cold - and of course not always - my defender either does not respond to the throttle for 1-5 seconds and then accelerates or it picks up revs rise them drop and then it works again. I have had codes read and of course nothing came up. My mate at a small garage up the road checked the throttle sensor and map sensor - he said voltages moved up and down “fine” but he doesn’t know transits of defenders.’
Once the car is hot it works fine. One other thought, could it be the turbo actuator. I see when I press the throttle on my drive it engages the turbo but then backs off again. Maybe of course interrelated to MAF sensor. Thanks for your help. Snowy I've had this problem too I changed the fuel cap thinking that could have had somthing to do with it to no effect Then bought a LR MAF seemed ok for a while but i think the hot summer helped or i thought it was better Now i'm going to bite the bullet and buy a new fuel pump from Paddocks PART NUMBER: LR009587 and hopefully that works  |
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22nd Jan 2019 12:06am |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2260  
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How do you know your HP pump isnt working? Puma 110" SW
............................................................. Earth first. Other planets later |
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22nd Jan 2019 12:31am |
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| kaney Member Since: 01 Oct 2018 Location: Bolton Posts: 232
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Garage has checked and checked and recons it's a common problem with transit's so before ordering one more check then being done a week on Friday
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22nd Jan 2019 9:43am |
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| kaney Member Since: 01 Oct 2018 Location: Bolton Posts: 232
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Well just double checked and it's not the item wanted it's part no wqb100440 the one that sits in the tank and a lot less money
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22nd Jan 2019 10:35am |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2260
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Isnt that a lift pump? From your avatar I reckon yours is a 2.4 which does not have it. Puma 110" SW
............................................................. Earth first. Other planets later |
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22nd Jan 2019 1:57pm |
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| kaney Member Since: 01 Oct 2018 Location: Bolton Posts: 232
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Given my reg and checked with LR it's the fuel pump which goes in the tank also added seals and adapter fuel line
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22nd Jan 2019 2:02pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2260
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No fuel pump on the tank of a 2.4 Puma 110" SW
............................................................. Earth first. Other planets later |
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23rd Jan 2019 2:48am |
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| Dreamweapon Member Since: 19 Dec 2016 Location: Hessische Odenwald Posts: 55  
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Give the MAF and MAP a good clean with contact cleaner first. Run diesel fuel additive (Liqui Moly or similar) for a couple of tanks and a couple of good motorway runs, especially if you often drive short journeys. Also you can run a relearn without replacing the VCV (using Forscan or similar) first to find out if the actual valve is knackered. Had similar problems and the VCV relearn smoothed things out considerably. No reason to replace components that just need a clean and / or reset. |
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23rd Jan 2019 7:58am |
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| kaney Member Since: 01 Oct 2018 Location: Bolton Posts: 232
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Click image to enlarge Well this was changed today and there is a differance driving it next job is for the oil leak rocker cover gasket hopefully and not the gasket underneath the next block the macanic said he also thinks there is a falt on the fuel pressure regulator so that will prob be changed at the same time as it was late and he was busy giving other owners their cars back so we will chat about that another time. I wonder if i will ever be able to save up again for anything else |
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4th Feb 2019 8:48pm |
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