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Intermittent clicking sound at idle 5.0L V8
Maybe fan clutch, but sounds a little different to me. I wonder if the fan is hitting the brush guard in the fan shroud - the sound is kind of “soft” like that. I’ve seen reports of this happening as the motor mounts start to wear (when you rev the motor, it shifts enough to stop rubbing), but... -
LR4 front fuel pumps
There was a TSB out years ago to replace the fuel pumps for noise complaints. But I don’t think the fuel pumps make what I would describe as “knocking.” More of a metallic “ticking” or “tapping” noise caused by the tappets, but it can be quite loud. A pretty fast tempo. “Knocking” makes me... -
Compomotive wheels bent?
Pretty hard to believe all four wheels are bent. You’d probably feel a bent wheel. But you should also be able to see it pretty easily. Jack it up (one at a time or all four) and rig-up a makeshift runout gauge - just any kind of pencil or other stick held close to the rim. Spin it and watch... -
2012 LR4 - Diagnosing two separate vibrations
Re vibration 2: My only other suggestion is the transmission heat shield. It’s a known issue - happens right at about 1280 RPMs under load and you can only really notice it when you are going pretty slow. You can usually hear it more than feel it though (although I can feel it a bit) - kind... -
Name this part from my LR4
Looks like a plastic piece from the inside of the bumper reinforcer. If you look up that part number, you’ll pull some parts up on eBay. Zoom in on some of the reinforcer bars and it looks like a piece of plastic from the inner surface. E.g.: https://www.ebay.com/itm/164248557720. -
'13 will lose power and die after a quick stop
Agree - check the purge valve. Might also be liquid fuel in your charcoal canister. Someone once posted a pic showing a black sludge coming out of the purge valve - that’s a sure sign, but it doesn’t need to get that bad to cause problems. -
LR4 Fuel Issues after alternator fail
sounds like the lp fuel pump. i think the old test was to turn your ignition on and of several time (turn on for 10 seconds or so, then off, then on for another 10 seconds or so, etc) to try to get the pump to build up some pressure. if that helped to get it started, but would then quit, it... -
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First post- going to look at a LR4 soon.
Aside from mechanical issues, are you familiar with the drive train options on this car? For the 2014-2016 models, you need the HD package to get low range gearing and locking rear differential. Some people care, others don’t. Seems many people are at least surprised by the missing low range... -
First post- going to look at a LR4 soon.
I know people have said there are timing chain issues post 2014, but I don’t think I’ve ever seen evidence of it. I remember a lot of people referring to some post from a mechanic on Facebook saying there were a lot of timing chain issues on all the vehicles, but I haven’t seen any real... -
dreaded coolant level warning
The coolant low warning is based on the sensor in the overflow reservoir. Maybe the hill was steep enough that the coolant in the reservoir moved to the side and exposed the sensor. Can’t explain the smell - uphill or level shouldn’t make any difference to the rest of the system which should... -
A/C Help
Does the blower come on, just no ac? What about the little light that indicates ac? Stays off when you toggle ac on/off? If the blower works, I tend to agree that it sounds like the clutch relay or the solenoid clutch in the compressor itself (though could also be wiring). On the LR4, looks... -
vibration at idle - motor mounts?
If you’ve got a manifold pressure problem, that’s probably the cause of the slightly rough idle. Could be basically anything that is affecting (increasing or decreasing) the flow of air into the manifold - throttle body, vacuum leak, pressure leak, obstruction (air filters). Some specific... -
vibration at idle - motor mounts?
What are you idling at? Does it surge at all? Does toggling the ac on/off make any difference? Might check throttle body for dirt/gum - could try cleaning it with some carb cleaner, and see if it makes a difference. Clean air filters? If you have a GAP tool or the like, could check your fuel... -
2015 LR4 Head Gasket Replacement
$8k for that coolant work and control arms replacement seems outrageous to me. The coolant system work should have been like $3k-4k. What do control arms run $1500 or so? Shops do charge lot for head gaskets, but I’d do my own compression test first. This place might just be trying to rip... -
Mass Air Flow Sensor Voltage
I’m not sure. Your o2 graphs are not what I’m used to seeing, but both sensors seem to be oscillating. That doesn’t necessarily mean one is not bad (they can get slow to respond throwing off your fuel trims). But it’s not likely both would go at once. I think bank 2 fuel trims look wonkier... -
Mass Air Flow Sensor Voltage
hmmm…tough to read that graph of sensor 1. Try to compress the x axis timescale so we can see more time - like maybe 80-90 seconds or so at least. And expand the y axis so you can see the fluctuations better. You should be able to use your existing read and just pinch or expand with your... -
Mass Air Flow Sensor Voltage
I think it might be listed as lambda. I’m attaching some old data I had once posted here in the forums. You can see the oscillation to look for in working sensors. -
Mass Air Flow Sensor Voltage
Graph says sensor 2. For fuel control, need to be looking at sensor 1. warm engine, just idling (don’t throttle). For this sensor 2 data, was the engine just idling? I wouldn’t have expected so much variation. If I get a chance today, I’ll try to run the test on my car for comparison. -
Mass Air Flow Sensor Voltage
The other thing I’ll mention - your fuel trims are off, but not way off. I’m not actually sure they’re off enough to cause any drivability issues. Still worth checking your o2 sensors, but I’m wondering if what you are feeling at 40 - 50 mph (1600-2000 rpm) is engine roughness (i.e., misfire)... -
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Mass Air Flow Sensor Voltage
Been a while since I looked at this, so hopefully I explain correctly: There are 3 o2 sensors on each bank for this car: Pre-cat, mid-cat, and post-cat. The pre-cat sensor is used for fuel trim control, which should be sensor 1. See if you can find sensor voltage on the GAP tool for sensor... -
Mass Air Flow Sensor Voltage
Forgot to mention that the car needs to be warmed up. When its cold, it runs on a set fuel schedule. when its warm, it goes into closed loop feedback. You are running a little rich on bank 2. I would next check your oxygen sensor voltages. you might have a bad o2 sensor. -
Mass Air Flow Sensor Voltage
I’d check your mass air flow rates instead of voltage on the GAP tool and see what they look like - bank1 relative to bank2. I know they’re calculated from voltage, but I’ve had some strange things happen with the GAP tool - sometimes some functions don’t seem to work while others do. If the... -
All is lost?
On your question re thermostat, my understanding from past research is that the V6 engine seems to run a thermostat that opens at around 204-207 and is not fully open until 228, whereas I believe the older V8 models ran a thermostat that opened around 180F or 190F and was fully open around 203F...
