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i went out and bought a infrared thermometer and was taking temps of everything even my cat and i decided to start aiming it all over my truck and the driver side manifold reads 180ish all he way across there the exhaust ports are. the driver side is lower like maybe 150 ish and jumps around a bit so i was thinking what the heck it doesnt sound like an injector is going out i only have 140k on this thing so maybe the UVCH is going bad?! any ideas or personal experience from you guys? im going to play around testing stuff more by the way the truck was running when i tested everything. i did do the 50 cent mod to this truck one day in school but i didnt notice any damage at the time but hey who knows if it was damaged at the time. any continuity testing i can do?
The UVCH doesn't go bad like that. It either develops an intermittent short or an all the time short.
Sometimes doing a bunch of tests on an engine that is running just fine does nothing but lead you on a wild goose chase, ends up costing a bunch of money, and doesn't actually fix anything because there's nothing to fix. Sometimes though, it does mess something else up to extend the process even further.
ok well heres the problem i have a rough shift every now and then and the transmission expert thinks its an engine performance problem. its obvious something is wrong with the truck if it runs like crap one day and the other day it doesnt. it has been an on going problem for about 38 thousand miles now so its getting old. i have a feeling its an electrical gremlin somewhere but i just dont know where or what until the problem gets worse.
The IR gun is quite literally a shot in the dark. The UVCH link in my signature will likely get you closer to answers.
thanks a lot for the help tugly. i checked them and i will go back out in a minute and check again. but my numbers are coming out between 4-5 ohms but injector 6 and 8 are all over the place both of them may settle to 4.7 but then jump back up to 18 then 11 basically all over. ill keep testing and seewhat i come up with i noticed today on my way home my truck started to idle different at a light deffinetly a lower idle.
i will take the driver side valve cover off tomorrow and inspect the harness. by the way the engine was warm when i did this test but the last time i tested it all the resistance was 3.7 on everything roughly but the 2nd and 8th injector were still bouncing and staying around 5 ohms. ill figure it out tomorrow its getting dark and very cold here. thanks for the advice!
Loose driver-side UVCH. You're on it. If it were me, I would order a pair of UVCHs from Riffraff diesel. If you are the preventative type like me, get a set of glow plugs while you're at it. If this strains the budget, you can try the 50-cent mod, but that's not completely without risk.
Loose driver-side UVCH. You're on it. If it were me, I would order a pair of UVCHs from Riffraff diesel. If you are the preventative type like me, get a set of glow plugs while you're at it. If this strains the budget, you can try the 50-cent mod, but that's not completely without risk.
This is an example of a 50-cent fail:
the truck ran like a slug today and i have my edge set up on race mode i had to run this thing to 2500 rpms to even move. the ohm readings are all over the place like i said one second its 4 ohms the next its 60 then 124 then 4 again. i didnt know the 50 cent mod could fail i just might pull it apart quick and see what i find. its zero degrees out right now but i just might do it to fix this thing
im just curious in your 50 cent fail picture how did that truck act? dead injectors? sluggish? check engine light? i dont have a check engine light but i do remember when i pulled the valve covers the driver side specifically was loose at this was when i had roughly 120k on it i think. But i just want to make sure im understanding this correctly as far as the situation you had compared to mine. like today its ran the worst it ever has but tomorrow it might be just fine im not sure if every bump i hit knocks it around or what causing my power loss and gain. i will order the harness's and most likely glow plugs like you recommended though. ill limp the truck for now then tear it down when the parts show up.
The fail was on the passenger side - 5 and 7 were hit and miss, with 7 being the worst. New UVCH and that bugger really gripped - no need for a mod there.
Make sure you really inspect the VC gasket for damage, and check the continuity while it's loose. They rarely have problems, but a loose UVCH has been know to cause damage:
I would stress, if you are comfortable with putting 80 bucks under the hood for new GPs to prevent going in there again, it's a safe bet. If it stings to do those without symptoms - you can risk it and hope they last a long time yet. The bugger is, you don't know if you need GPs until it's too friggin' cold to work on the truck. I'm a big fan of one and done.
The picture of his fail isn't enough separation to affect the electrical connection of the connector. Tugly has been chasing things under his hood for many years now.
My UVCH connection has looked like the picture above for the last 300,000 miles or so other than the part about me not using a Utah quarter.
...depending on the situation - the fail was verified on the meter, and it wasn't on Stinky.
Fair enough, but I would suspect a burnt pin or some other issue than the minor separation. Perhaps it's just the state of Utah that doesn't belong in there.
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