View previous topic :: View next topic |
Author |
Message |
gilmore
Joined: 01 Feb 2012 Posts: 143
|
Posted: Wed Dec 27, 2017 9:44 pm Post subject: Throttle potentiometer |
|
|
My 50th is still suffering from throttle problems - fast idling when hot, hesitation out of junctions (both only occur when hot), then last Sunday she suffered from loss off power on and off for a couple of miles (I headed home).
I’ve previously replaced both exhaust sensors, cleaned the stepper motor, and checked the air intake for leaks, to no avail. My mechanic says the only other thing he can think of is the throttle potentiometer, but LR don’t have any.
Any suggestions folks?
Thanks
Rob _________________ Defender 50th Anniversary Edition GB236
Mercedes ML350CDI Sport
Honda/HM CRE300X Enduro
Honda CRF250X Trail Bike
Husqvarna FE350 Enduro
Honda CB750K4 - 1974
Honda CB750K5 - 1975
Ford Transit Custom (for the bikes) |
|
Back to top |
|
|
V8GPC
Joined: 03 Apr 2016 Posts: 265 Location: Manchester
|
|
Back to top |
|
|
V8GPC
Joined: 03 Apr 2016 Posts: 265 Location: Manchester
|
|
Back to top |
|
|
Captainbeaky
Joined: 23 Jan 2014 Posts: 117 Location: Madeira, Portugal
|
Posted: Wed Jan 03, 2018 11:48 pm Post subject: |
|
|
It’s best to get the car diagnosed properly - otherwise you can end up changing parts unnecessarily, and perhaps still not find the culprit.
Yes, it could be the fuel temp sensor - but it could also be the wiring!
Change the sensor, and the fault doesn’t go away, so you move onto the throttle potentiometer.....
Or it could not be an electrical fault at all.
In a recent case, I was diagnosing a poorly performing VW Golf 1.4 - after changing the failed exhaust sensor, it still wasn’t right - especially when hot. If I did not have the diagnostic kit for this car, then I wouldn’t have found that the device that selects between hot and cold air into the engine had failed to “hot”, and I had intake temperatures of 80 degrees (it’s not a turbo engine!)
Any decent LR specialist will have the kit to interrogate the GEMS, and pinpoint the problem straight away.
It wouldn’t be a bad idea to pick up an inlet manifold for the parts though!
Yes, a diagnostic check will cost some money, but after all, you are using a mechanics time and often quite considerable investment in tools, it’s quite fair that there should be a charge for this.
At the very least, the resistance values of the sensors can be read by a multimieter from the ECU connectors.
Mike. _________________ Proprietor of Paradise Engineering in Madeira.
Owner of GB386 50th Defender v8 - being rebuilt.
2013 Honda NC700X
2005 Honda XR250R
2007 Smart ForTwo Turbo.
2010 VW Transporter camper. |
|
Back to top |
|
|
gilmore
Joined: 01 Feb 2012 Posts: 143
|
Posted: Tue Jan 16, 2018 10:32 pm Post subject: |
|
|
Sound advice mate.
Looks like she’ll have a trip to an LR dealer unless someone knows a specialist in the midlands. My guy (LR Services in Notts) is at the swapping thing out stage.
Cheers
Rob _________________ Defender 50th Anniversary Edition GB236
Mercedes ML350CDI Sport
Honda/HM CRE300X Enduro
Honda CRF250X Trail Bike
Husqvarna FE350 Enduro
Honda CB750K4 - 1974
Honda CB750K5 - 1975
Ford Transit Custom (for the bikes) |
|
Back to top |
|
|
Captainbeaky
Joined: 23 Jan 2014 Posts: 117 Location: Madeira, Portugal
|
Posted: Tue Jan 16, 2018 10:41 pm Post subject: |
|
|
I’m not sure a dealer would be the best place either!
You need to find someone who knows the engine and has the right tools.
I’m surprised that a LR specialist doesn’t have the basic diagnostic tools - swapping out parts is an expensive pastime. _________________ Proprietor of Paradise Engineering in Madeira.
Owner of GB386 50th Defender v8 - being rebuilt.
2013 Honda NC700X
2005 Honda XR250R
2007 Smart ForTwo Turbo.
2010 VW Transporter camper. |
|
Back to top |
|
|
Captainbeaky
Joined: 23 Jan 2014 Posts: 117 Location: Madeira, Portugal
|
Posted: Tue Jan 16, 2018 10:43 pm Post subject: |
|
|
Suggest you pop on one of the LR forums, and ask on the P38 threads to see if anyone knows of a good specialist with the diagnostic kit. _________________ Proprietor of Paradise Engineering in Madeira.
Owner of GB386 50th Defender v8 - being rebuilt.
2013 Honda NC700X
2005 Honda XR250R
2007 Smart ForTwo Turbo.
2010 VW Transporter camper. |
|
Back to top |
|
|
gilmore
Joined: 01 Feb 2012 Posts: 143
|
Posted: Sun Jan 21, 2018 4:55 pm Post subject: |
|
|
Captainbeaky wrote: | I’m not sure a dealer would be the best place either!
You need to find someone who knows the engine and has the right tools.
I’m surprised that a LR specialist doesn’t have the basic diagnostic tools - swapping out parts is an expensive pastime. |
He checked it out on a Faultmate and said there's nothing showing to give him a steer on the problem. I've not idea how the Faultmate compares with any other bit of diagnostic kit.
Comments?
Does anyone know a specialist in LR V8 tuning within striking distance of Nottingham? -say midlands-ish.
cheers
rob _________________ Defender 50th Anniversary Edition GB236
Mercedes ML350CDI Sport
Honda/HM CRE300X Enduro
Honda CRF250X Trail Bike
Husqvarna FE350 Enduro
Honda CB750K4 - 1974
Honda CB750K5 - 1975
Ford Transit Custom (for the bikes) |
|
Back to top |
|
|
MikeB
Joined: 20 Dec 2007 Posts: 131 Location: North Warwickshire
|
Posted: Sun Jan 21, 2018 5:57 pm Post subject: |
|
|
RPi in Norwich. I took mine there from the Midlands. It's a hike, but they really know their stuff and specialise in the V8. |
|
Back to top |
|
|
gilmore
Joined: 01 Feb 2012 Posts: 143
|
Posted: Sat Mar 17, 2018 7:55 am Post subject: |
|
|
In the end it was the throttle potentiometer. Managed to source an aftermarket one from Bearmach, so she runs like a dream now.
cheers
rob _________________ Defender 50th Anniversary Edition GB236
Mercedes ML350CDI Sport
Honda/HM CRE300X Enduro
Honda CRF250X Trail Bike
Husqvarna FE350 Enduro
Honda CB750K4 - 1974
Honda CB750K5 - 1975
Ford Transit Custom (for the bikes) |
|
Back to top |
|
|
|