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Long crank, no faults
Mine does not ever rev that high, but I live in Northern CA and keep it garaged, so it’s never very cold at startup. My v6 revs at 1200 for about 30 seconds, then drops to 800 for just a couple seconds, then down to 600. Temperature might affect it, but if you are still in Pasadena, I don’t... -
P0301- Cylinder 1 misfire. Restricted Performance. Rough idle under Load. 2012 LR4
Injector seems likely to me as well, could be clogged but might also be failing open and flooding - much more likely to cause the restricted performance I think. -
Long crank, no faults
At idle, short and long term fuel trims added together should be within +/-10%. 0% is perfect. Those idle numbers seem okay - so not sure what’s causing that spike to 2000. In case you are interested in how the system works: When warm and in closed-loop fuel control, the ECM calculates... -
Long crank, no faults
Yeah - I don’t think battery would cause this issue, but it is maybe something to keep an eye on. Thinking about the high RPMs at start, I wonder if you could have a vacuum leak. What are your RPMs at idle after it warms up? I would expect a lean code to show up, but you could check your... -
Long crank, no faults
I don’t really trust the voltage displayed on the dash readout, but probably gives you an approximation of your charging system voltage. Your probably seeing 12.7 show up after cranking because the alternator just gave the system a boost. Normal that the heater motor would bring that down... -
Long crank, no faults
11.7v or even towards 12v is not good with key off and all systems down. You should be seeing 12.6v. When testing, pop the hood and let it set key off for a good 10 min so all the systems shut down completely. You can also set your voltmeter to max/min, hook it up and start the car. then... -
Long crank, no faults
As the coolant heats up, temp sensor 1 will trend towards 0.5 volts. Temp sensor 2 will stay cooler (higher volts) because that‘s the cold side coming out of the radiator. So the general trend looks okay. Right after starting, you’re already putting some heat into the system, which might... -
Long crank, no faults
I can’t remember if you have the v8 or v6. If you have the v8, you might get to it. If you have the v6, it’s harder to get to with the supercharger sticking up. Not sure if you can reach it. Maybe remove the windshield cowling? Not sure if that would give you better access. -
Long crank, no faults
Yeah, I think there is something wrong with that 0.6 v. I just went out and measured mine (dead cold). I’m seeing close numbers on both. -
Another Coolant Leak - Occasional White Vapor at Idle? 2015 SCV6
@Waterndirt - I remember your earlier posts about this, but did you ever figure out what caused the head gasket to go? Seemed like quite a coincidence. -
Another Coolant Leak - Occasional White Vapor at Idle? 2015 SCV6
I’d just keep an eye on it. Use a sharpie and mark your cold coolant level - dead cold, like first thing before starting the car in the morning. Could still be a little air working its way out of the system. If it’s so small that you’re not sure it’s happening, doesn’t really matter what’s... -
Long crank, no faults
There are two temp sensors, one just below the T-stat in one of the radiator hoses near the water pump, and the other mounted in the rear crossover. I don’t know which would be causing the trouble. I think the rear registers the hot side of the coolant system leaving the block, and the front... -
Long crank, no faults
Checked mine again after sitting one day and got same results as last time - ignition on, before cranking, showed 650 kpa (95 psi). I’ll see if I can get a graph of the pressure increase on cranking. Maybe comparing graphs can give you some idea of the hpfp performance. Also wondering if you... -
Long crank, no faults
As for the pressure regulator, I believe the regulators are built into the HPFP, not separately replaceable. -
Long crank, no faults
Finally got a chance to look at fuel rail pressure. My car was sitting all weekend without being started. When i put on the ignition, before starting, fuel rail pressure read 650 kpa, so about 95 psi. It started immediately, as always. I wouldn’t expect to see much pressure, but maybe you... -
Long crank, no faults
When the car wakes up, it powers up the low pressure fuel pump. But I was thinking that just pushes fuel up to the HPFPs, which then pump it into the rail. But I might be wrong. -
Long crank, no faults
I was thinking the fuel rail is supposed to maintain some pressure when the car is switched off, and it might be leaking down in this case. So, when you crank after leaving it set, the pumps need to fill the rail again before you get fuel to the cylinders. It’s not going to be nearly the same... -
Long crank, no faults
I’d be thinking fuel. Not sure why cold weather would affect it, but maybe leaking injectors, minor leak in a fuel line connection, or faulty pressure regulator letting the fuel drain out when the car sits. I think the pressure regulators are built into the hp fuel pumps. -
Best Brand MAF and MAP Sensors
@Michael Gain - Nice to see you still active on the forum. Did you get tired of that Rebel yet? Ready to get another LR4 (not that I’m selling)? -
Is there anyway to see if crossover pipes have been done?
The front crossover pipes were not redesigned until about 2018, so none of the LR4s had redesigned pipes as sold. You can spot recently replaced front crossovers in the 2014-2016 models. But, they did not redesign the front crossovers for the V8 models. So can’t tell if V8 front crossovers... -
Is there anyway to see if crossover pipes have been done?
Not the same front crossover due to placement of the supercharger snout. I believe Asilver is correct. Only the V6 crossover was redesigned. So, prob no way to tell if the pipe on the V8 was ever changed. -
Any way to tell if timing chain/guides/sliders are original to vehicle?
This sounds like maybe an oil delivery issue. Even if the original guides were not replaced, I wouldn’t have expected them to be worn down so far as to be characterized as “non-existent” - unless you’ve got a ton of miles on them. I recall there are some oiler tubes that drop oil right onto... -
Misfiring Cyl 2/4/6 ?? 2015 LR4
If it sounds something like marbles rattling, that’s just the isolator/coupler. Known issue and easy fix, but won’t affect performance. Otherwise, I still wonder if it might be the bypass valve. If there is something wrong with the bypass, I think it will affect performance. -
Misfiring Cyl 2/4/6 ?? 2015 LR4
If your sc is not outputting the expected boost, that might be messing up your idle as well. Not to mention that particles of metal might be going into your cylinders if the sc blades really are contacting each other. I find it hard to imagine slop in the blade shafts is really the problem...
