New found problems

[Clark]

The pressure sensor above the oil filter. And the cam solenoid.

 

[Can007]

There are a couple more things you could do. 1. Clean your engine not only oil change. Use something that will remove all the sludge from your engine. There are many products to choice from (do research). I used seafoam. I did it 2 twice in a month and it really cleaned the engine. I was impressed the second time how black the oil was with new oil after a week of driving.
2. Change your oil pressure senor. It is located on the engine block (passenger side). Near the firewall above the spark plugs. 3. Check the wiring of the oil pressure switch that you changed. 4. Was the Cam senor from the dealer? Several people have had to re-replace the cam senor because it was not the updated one (no screens). 5. Check your tranny oil level. 6. Add a transmission cooler (every H3 should do this mod in my opinion); H3's run hot. Excessive Heat kills any and all Engines & Transmissions.

 

[Clark]

There are a couple more things you could do. 1. Clean your engine not only oil change. Use something that will remove all the sludge from your engine. There are many products to choice from (do research). I used seafoam. I did it 2 twice in a month and it really cleaned the engine. I was impressed the second time how black the oil was with new oil after a week of driving.
2. Change your oil pressure senor. It is located on the engine block (passenger side). Near the firewall above the spark plugs. 3. Check the wiring of the oil pressure switch that you changed. 4. Was the Cam senor from the dealer? Several people have had to re-replace the cam senor because it was not the updated one (no screens). 5. Check your tranny oil level. 6. Add a transmission cooler (every H3 should do this mod in my opinion); H3's run hot. Excessive Heat kills any and all Engines & Transmissions.

Ok I appreciate your advice very much. The cam solenoid I replaced is a "Dorman" its the updated sensor. The oil pressure sensor is an ac/delco. the old one was loaded with oil. I sprayed the electrical connection with CRC wire cleaner. I have been running Royal Purple !0w30 for the last 3 years. I'm the 2nd owner and the 1st owner ran a synthetic blend, So I went full synthetic and she's been running great. Today I ran her locally and she was just fine no light or chime. I have my fingers crossed Also My tranny is well maintained and the oil level is great. I have her serviced once a year I've been running Motul synthetic ATF. last year i replace the speed sensor And she runs just fine. Thanks again I will check out that oil sensor you mentioned and I will also check out the sensor wiring.

 

[amrg]

Does your low pressure light come up when the engine is cold or after it warmed up?

My oil light used to come once the ambient temps were over 90* or when its over 80* and I get the a/c on (oil temps will get higher). Once engine was hot, the oil light would come up at every stop and wouldnt go until im revved up.
I fought it over 2 summers, it wasnt a big deal in the first summer but in the second one it was horrible.

Long story short, I had the engine pulled out and opened, turned out to be a stuck oil return valve inside the engine that ONLY required cleaning (we initially pulled it to replace the oil pump).

This valve basically lets oil bypass something when its cold, once its hot it should close and the oil goes somewhere else.

Now the long story, Before fixing it finally, I had the oil pressure sender replaced twice. Had the oil replaced twice, had an oil flush done 3 times without any improvements. We dont have seafoam here, and since everyone said oil pump, I didnt bother trying to import it here. Seeing it turned out the whole issue was sludge buildup inside that specific valve, seafoam may have helped clean it up without the need to have the whole engine pulled out.


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[Clark]

Does your low pressure light come up when the engine is cold or after it warmed up?

My oil light used to come once the ambient temps were over 90* or when its over 80* and I get the a/c on (oil temps will get higher). Once engine was hot, the oil light would come up at every stop and wouldnt go until im revved up.
I fought it over 2 summers, it wasnt a big deal in the first summer but in the second one it was horrible.

Long story short, I had the engine pulled out and opened, turned out to be a stuck oil return valve inside the engine that ONLY required cleaning (we initially pulled it to replace the oil pump).

This valve basically lets oil bypass something when its cold, once its hot it should close and the oil goes somewhere else.

Now the long story, Before fixing it finally, I had the oil pressure sender replaced twice. Had the oil replaced twice, had an oil flush done 3 times without any improvements. We dont have seafoam here, and since everyone said oil pump, I didnt bother trying to import it here. Seeing it turned out the whole issue was sludge buildup inside that specific valve, seafoam may have helped clean it up without the need to have the whole engine pulled out

Only when she's hot and driven for over an hour, My oil levels are fine and my operating temp is fine too. but only after my dash says Oil and the chime start. on and off

 

[humvee]

my operating temp is fine too. but only after my dash says Oil and the chime start. on and off

Are you basing your temp reading only off the gauge? Or do you monitor through an app.
Hummer temp dials are not so accurate around operating temperatures. It can point slightly underneath the middle point but actually be running at up to 220F.


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[Clark]

]Are you basing your temp reading only off the gauge? Or do you monitor through an app.
Hummer temp dials are not so accurate around operating temperatures. It can point slightly underneath the middle point but actually be running at up to 220F.

yes off the gauge only in the summer the temp gets scary...lol

 

[Can007]

Does your low pressure light come up when the engine is cold or after it warmed up?

My oil light used to come once the ambient temps were over 90* or when its over 80* and I get the a/c on (oil temps will get higher). Once engine was hot, the oil light would come up at every stop and wouldnt go until im revved up.
I fought it over 2 summers, it wasnt a big deal in the first summer but in the second one it was horrible.

Long story short, I had the engine pulled out and opened, turned out to be a stuck oil return valve inside the engine that ONLY required cleaning (we initially pulled it to replace the oil pump).

This valve basically lets oil bypass something when its cold, once its hot it should close and the oil goes somewhere else.

Now the long story, Before fixing it finally, I had the oil pressure sender replaced twice. Had the oil replaced twice, had an oil flush done 3 times without any improvements. We dont have seafoam here, and since everyone said oil pump, I didnt bother trying to import it here. Seeing it turned out the whole issue was sludge buildup inside that specific valve, seafoam may have helped clean it up without the need to have the whole engine pulled out.


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I battled this for 2.5 years. So annoying. After I cleaned the engine I haven't experienced the issue. Unfortunately not before switching sensors and several additional mods.

 

[Can007]

]Are you basing your temp reading only off the gauge? Or do you monitor through an app.
Hummer temp dials are not so accurate around operating temperatures. It can point slightly underneath the middle point but actually be running at up to 220F.

yes off the gauge only in the summer the temp gets scary...lol[/QUOTE
Add a transmission cooler. It's the best thing I've done so far

 

[amrg]

Yeah I forgot to add that my oil levels were always fine and I was in operating temps.
Keep in mind, engine oil temps are different than coolant temps. So eventhough coolant would be at 210 after 15 mins, oil temps need more time to go up (depending on engine load)

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[Clark]

Thanks guys for the advice. I do have a cooler I will instal in the spring. But for now I need to get rid of this annoying oil light and chime. So I guess it's off to the dealer after I check my connections. I'm scared of seafoam I used it once in my old jeep xj and the smoke it created I thought I blew the motor....lol

 

[amrg]

If the dealer diagnosis an oil pump try the seamfoam route first before spending big money!

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[Clark]

If the dealer diagnosis an oil pump try the seamfoam route first before spending big money!

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Oh well I went to the dealer and I won't be able to get in there until mid February Just my luck.

 

[rascole]

Gunk Motor Medic, Marvel Mystery Oil or any other high detergent additive will work to flush the sludge out. I have used it many times and we use a similar "solvent" oil to flush our compressors and pumps before a tear down.

 

[Clark]

Gunk Motor Medic, Marvel Mystery Oil or any other high detergent additive will work to flush the sludge out. I have used it many times and we use a similar "solvent" oil to flush our compressors and pumps before a tear down.

But I've been running royal purple for the last 3years ever since I first bought my truck. Wow I haven't used Marvel Mystery oil since the 70's. I'm due for an oil
change in another thousand miles "so why wait till the last minute right" I'll give it a shot and run her for a day or two. Then change my oil. Thank you for the input

 

[4speedfunk]

I used some stuff called Rislone on my 200k Burb. It really helped and got rid of a lifter tap.

 

[Can007]

Gunk Motor Medic, Marvel Mystery Oil or any other high detergent additive will work to flush the sludge out. I have used it many times and we use a similar "solvent" oil to flush our compressors and pumps before a tear down.

But I've been running royal purple for the last 3years ever since I first bought my truck. Wow I haven't used Marvel Mystery oil since the 70's. I'm due for an oil
change in another thousand miles "so why wait till the last minute right" I'll give it a shot and run her for a day or two. Then change my oil. Thank you for the input

There are several products to choice from. I recommend Seafoam but do it twice. It doesn't matter the kind of oil you have used. These SUVs turn everything into sludge at one point or another. I performed an entire cleaning with seafoam. The Gas tank, engine (oil) and intake valve. Good luck brother!!! I hated that ding sound!!!

 

[Clark]

There are several products to choice from. I recommend Seafoam but do it twice. It doesn't matter the kind of oil you have used. These SUVs turn everything into sludge at one point or another. I performed an entire cleaning with seafoam. The Gas tank, engine (oil) and intake valve. Good luck brother!!! I hated that ding sound!!![/QUOTE]

question would using Seafoam in my oil make my truck smoke? like when it's used in the fuel tank? thanks

 

[Can007]

There are several products to choice from. I recommend Seafoam but do it twice. It doesn't matter the kind of oil you have used. These SUVs turn everything into sludge at one point or another. I performed an entire cleaning with seafoam. The Gas tank, engine (oil) and intake valve. Good luck brother!!! I hated that ding sound!!!

question would using Seafoam in my oil make my truck smoke? like when it's used in the fuel tank? thanks[/QUOTE]

No