Am I losing power or is it my imagination.
#21
02-18-2017, 10:41 AM
Veteran Member
#22
02-18-2017, 01:33 PM
No, it's the actual intake valves. Deposits build up on them slowly as you put more miles on the car. So it's a slow effect of robbing power so you won't notice it since you drive the car every day.
You need to remove the intake manifold and clean them off. It's a very baked on tar-like substance, and I found it's best to use throttle body cleaner by letting it soak the valves and then scrub gently with a firm brush.
Not a fun job, but that's the downside of direct injection. You can google it to learn more.
I did it on my gray XF and it made a big difference in power.
You need to remove the intake manifold and clean them off. It's a very baked on tar-like substance, and I found it's best to use throttle body cleaner by letting it soak the valves and then scrub gently with a firm brush.
Not a fun job, but that's the downside of direct injection. You can google it to learn more.
I did it on my gray XF and it made a big difference in power.
#23
02-18-2017, 01:42 PM
Yep, literally thousands of codes can be generated without causing a CEL, a good/proper code reader will show most of them, although to see all of them in detail you need the proper SDD equipment.
I use an iCarsoft i930, picks up almost everything, see here: iCarsoft -Professional Multi System Scanner For LandRover / Jaguar / OBDII -i930 eBay
I use an iCarsoft i930, picks up almost everything, see here: iCarsoft -Professional Multi System Scanner For LandRover / Jaguar / OBDII -i930 eBay
#24
02-18-2017, 04:49 PM
Veteran Member
How many miles on your car?
#25
02-18-2017, 04:54 PM
In these modern vehicles there are four different types of codes;
P - Powertrain
C - Chassis
B - Body
U - Network
For example if you have an ABS fault, that will have C codes, if you have an airbag fault, that will be B codes, and so on. But a little $20 generic scanner will not see these.
And of the powertrain codes, there are literally hundreds of manufacturer-specific codes that a generic scanner will not see.
#26
02-18-2017, 04:54 PM
ah I wasn't sure if it was part of the whole thing.. pushing close to 100k now
#27
02-19-2017, 08:43 AM
Veteran Member
#28
02-19-2017, 12:31 PM
could that be why I feel a rumble / shake while at idle? Is cleaning the maf and throttle bottle big jobs?
#30
02-20-2017, 04:59 PM
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The MAF sensors are a doddle to clean, just get a spray can of MAF sensor cleaner (I use CRC brand).
Each sensor is held on with a pair of Torx screws (T20 IIRC), just undo those screws, disconnect the wiring plugs, then take the sensors to your workbench and spray the wires (two bits on each sensor) 5 or 6 times, allow a minute or so to dry, then refit.
Each sensor is held on with a pair of Torx screws (T20 IIRC), just undo those screws, disconnect the wiring plugs, then take the sensors to your workbench and spray the wires (two bits on each sensor) 5 or 6 times, allow a minute or so to dry, then refit.
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