Diagnosis Jag - Injector failure?
#1
Diagnosis Jag - Injector failure?
Currently known:
*Rough idle/dropped cylinder('s) after warm
*will Rev somewhat ok, but still a dropped Cyl.
*no oil in coolant/or coolant in oil filter, all other signs normal.
*Starts fine, rough cold idle like usual (maybe a tad worse then normal)... Cleans up in a minute or two. Runs mint untill it starts to drop cylinder as it warms.
*exhaust smells like fuel
*Cylinders 1,2,3,4 effect mostly according to obdii data/codes.
I have a vid of the live data that will post once I return to my pc.
So I am leaning towards an injector sticking/stuck open. (already order 4 injectors and have the tool)
But before I tear this apart what's everyone think?
After a hard reset (battery Unhooked) second start.
*Rough idle/dropped cylinder('s) after warm
*will Rev somewhat ok, but still a dropped Cyl.
*no oil in coolant/or coolant in oil filter, all other signs normal.
*Starts fine, rough cold idle like usual (maybe a tad worse then normal)... Cleans up in a minute or two. Runs mint untill it starts to drop cylinder as it warms.
*exhaust smells like fuel
*Cylinders 1,2,3,4 effect mostly according to obdii data/codes.
I have a vid of the live data that will post once I return to my pc.
So I am leaning towards an injector sticking/stuck open. (already order 4 injectors and have the tool)
But before I tear this apart what's everyone think?
After a hard reset (battery Unhooked) second start.
#2
#3
@Unhingd I guess when they stick open, it allows the pressures on the rail to drop effecting the others. Did we ever get to the bottom of the cylinder numbering? according to the service manual if I read that correctly 1, 2, 3, 4 would be the front of the engine as opposed to the pass side (US LHD) like I was thinking at first. So thats comfusing, why the front?
#4
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Queen and Country (06-04-2019)
#5
This has happened to several of us on the X150 forum with our XKRs. In every single case, it was fuel injector related, and if one goes bad, it affects the whole bank. It has happened to mine twice during my ownership. It should clear up very quickly with injector replacement.
Josh,
Before you try to extract those injectors, drop a can of BG 44K in the tank. That solved a sticking injector 13 years ago on my pickup and it’s still working just fine.
The following 2 users liked this post by Unhingd:
Queen and Country (06-04-2019),
Reaxions (06-09-2022)
#6
Any danger in letting it run a bit? Other then some fuel possibly gettin into the oil? I have no cats so no worries there.
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Unhingd (06-02-2019)
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#8
Pulling the injectors is quite a challenge (without breaking them). If you decide to pull it, there is a spray product from Liqui Moly that you should start spraying around the hole the day before and pull the plug and spray it within the combustion chamber to remove the carbon deposit around the stem (heat the straw and curve it 180 degrees). If you brake it (common) have a drill bit and tap the hole to pull the steel part out. Get yourself the correct injector puller and always use it perfectly inline with the injector. The carbon buildup on the steel tip makes it quite challenging.
FYI, an injector stuck open will NOT affect the pressure on the high pressure rail...
FYI, an injector stuck open will NOT affect the pressure on the high pressure rail...
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Itismejoshy (06-03-2019)
#9
Dumping excessive fuel in a cylinder will wash off the oil layer on the cylinder and enable scoring of the cylinder. Be careful
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Itismejoshy (06-03-2019)
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yes, after some more investigation with the live data im somewhat torn....iv already replaced the HP pumps once (15k ago +-).
https://www.youtube.com/watch?v=WJ6X...ature=youtu.be
https://www.youtube.com/watch?v=WJ6X...ature=youtu.be
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You will want to see that the DESIRED pressure and ACTUAL pressure keep pace
https://youtu.be/gD-RtWojGNo
https://youtu.be/gD-RtWojGNo
if it is the pump(s) what would cause them to fail 2x within 40k? religious about oil changes, BS test have come back fine...any ideas?
Last edited by Itismejoshy; 06-03-2019 at 01:31 PM.
#18
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Itismejoshy (06-03-2019)
#19
#20
not really, have 2 pumps on the way (and 4 injectors/tool). Spent the evening setting up SDD on a new burner laptop (my old SDD was on a painfull almost unusable slow laptop) in hopes of verifying this with the datalogger and running any "test" procedures it recommends. i also believe i have had an injector issue on the pass side of the vehicle for some time, as my pass side factory cat (when it was still on the f-type) was throwing "cat below efficiency" codes that JLR shrugged off after some major work, was told it was a bad coil and it was replaced (except the new coil was on the drivers side after some investigation)....so could it be that an intermittent sticking open injector was pushing the pumps hard all the time to keep up(only a theory?) eventually leading to failure of the pump? on the plus side i just got my latest blackstone report and its perfect like all the others. i just don't understand how i am at my 3rd set of HPFP in less then 40k. i have run race fuel ( but even that only US 103) and less then a handful of times...always 93.