• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

06 LBZ getting smokey and laggy

Ok, tested so I'm not crazy. After 10hrs of sitting my radiator was still pressured, put the cap back on and fired it up, after 5 min I can still easily pinch the upper hose with 2 fingers.

If it all goes well this afternoon I will pull the upper rad hose and watch it pump. Will the tstats have to open to show flow?
 
10 HOURS!?! Holy cr uh yeah that's enough time and then some. Yes the thermostats have to open to test for flow. Upper radiator hose is what I do. With it cold I take off the hose, then slip it back on. Get a 5 gallon bucket set up in good location for hose to go into. Warm up the truck and then shut it off. Pull the hose, put it in the bucket and have some one start the truck while you watch the flow. My guess is that you will find a bad pump.

You could also have 1 good and 1 bad thermostat messing up the flow, so check both of those. Pan on the stove with a thermometer in the water. Watch for a sticking one where it stay shut a bit past its temp the "pops" open too late.
 
I figure after new stats and same issue I can rule that out but idk.

The pressure was just hearing a good hiss when I pulled the cap off meaning the pressure from running yesterday never bled off. No gauge but I figure that's a good sign. Parts store didn't have a thread in tester for the puke tank so I'm waiting on one from the ware house.
 
tanman_2006 said:
I figure after new stats and same issue I can rule that out but idk.

The pressure was just hearing a good hiss when I pulled the cap off meaning the pressure from running yesterday never bled off. No gauge but I figure that's a good sign. Parts store didn't have a thread in tester for the puke tank so I'm waiting on one from the ware house.
Click to expand...
No, thats a BAD sign. If you let the truck sit for 10 hours and it still had pressure in the cooling system, then it IS getting combustion gasses in the cooling system.
 
On the 10'hours of pressure: when you said "put the cap back on" I figured you used a hand pump pressure tester. Or is it holding pressure after just driving?

Still no pressure build up after 5 minutes of running makes me think more water pump than head gasket, but that was frigin hot that day. I would be leaning towards new water pump, and even if the head gaskets had to be done I would not want to start out with that old of a pump on it anyways.

The fact that it spit out some coolant after 260 is not surprising, and I've seen quite a few get that hot and be ok afterwards.
 
I'll keep waiting on my sample and the tester.

Both my tractors have pressure in the cooling system after sitting over night. Thought it was normal, wife's car did it too.
 
I figured if I had a blown gasket the coolant would bleed out the bad gasket once cylinder pressure was a 0 and coolant was at 10#

Not trying to argue I just am missing something I guess.
 
Its the heat the causes the expansion (pressure), once its cools back down the pressure should subside.

The sample is not going to be a conclusive negative. It can test fine and still have a breach between cylinder and coolant. You need to use a combustion tester like blockcheck. There was one brand that worked really well with diesel, but i cant remember it currently, i remember it was almost twice the cost but was worth it.

I know you said new tstats and cap, but i would test them anyways. 1 hour extra now can save you 15 hours later.
 
I am not sure if I missed this or not, but did you also replace the cap? I know this sounds stupid, but you could have a bad cap.
 
It has to be a bad pump then. Seems that you have ruled out most everything else. Just be sure to replace with a good brand name pump, no cheap shit. LOL
I hope you get it fixed!
 
No kidding, I was hauling small squares of hay yesterday morning and fell off the hay on my trailer from 5 bales up and landed on the ramps across my lower back and flipped off the ramp onto my face. 800 is a small price to pay for not bending over.
 
You must log in or register to reply here.
Back
Top