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Hey guys, hope it's ok to bring up my old thread. I just did a compression test on this. I did it on a cold engine, I know it is not the best way, but I am not up to working on a hot engine. Here are the results: I am surprised several cylinders are as high as they are. In addition, a couple...

Sorry to hear you are having this trouble. I thought the Optimizer engines were supposed to be bulletproof? I hope it is not as bad as it sounds. I will be watching this closely. Good luck with it.

Thanks for the input. After sitting for anywhere from a day to a month it starts as though there is nothing wrong. I don't think any liquid is getting into a cylinder. I have been trying to get air out of it by driving it off and on for about 8 mouths now, hoping there was air stuck in there...

Hi everyone, I hope its ok to revive an old thread. I have a little more time to look at this M1009 now. I pulled the thermostat housing and thermostat. I also pulled all the belts off the accessory drive. I then filled the crossover up to the top of the thermostat housing with antifreeze. I...

I will definitely scrap the head bolts in there now. I don’t know yet if I will get bolts or studs for it. I suspect the the studs are an unnecessary expense as the engine will not be modified. It will be some time before I get to do this as I have a 73 K10 I need to get some things completed...

I bought a bottle of test fluid for diesel engines. It still doesn’t show combustion gas in the cooling system. I guess that doesn’t mean I don’t have combustion gas in the cooling system, it may just not be enough to show up yet.

Thanks for the info. I do plan to have my current heads checked before I buy new ones. At this point I am trying to decide if I want to do the work myself, or take it to a shop to get it done. My concern is I have not dealt with any shops around here that can do the work so I don’t know who to...

Does anyone know where I can buy a set of reliable rebuilt heads. I am keeping this stock, no power adders. I hope to use it as a daily driver getting good mileage.

Last night I ran the engine for a while so I could watch it. When started cold there were no bubbles coming up in the overflow tank. After about 4 minutes of warming up, the temperature gauge was coming up, the bubbles started to come up in the overflow. I am beginning to think you are correct...

Unfortunately this makes a lot of sense. If the head is cracked, I guess nothing short of a replacement will fix it. I wonder how long it could last like it is.

This is the test kit I used and it did not show any exhaust gas in the cooling system. I wondered if the fluid was good so I tried it on the exhaust pipe and it quickly changed there so it seems to work.

The 19 lb cap allowed coolant under pressure to go to the overflow bottle and never let the system to pull any back from the overflow.

Sorry, I forgot to mention I did get the low coolant light a couple of houndred miles after topping it off with coolant when I bought the Blazer. That is how I initially discovered the concern.

I may or may not have a blown head gasket. I have conflicting information from the cooling system. Here is a list of what is going on, anyone have any thoughts on this issue? Thanks for the help! There are a lot of bubbles coming up in the radiator when the engine is running. When the radiator...

Thanks for the help everybody. I did find a WT3000 sensor with pigtail on Amazon. Hopefully it will be the right one.

This is a picture of the temperature sensor on the back of the driver side head. As you can see, the wires are in bad shape at the connector. Does anyone know where I can get another connector/pig tail to replace this one? In addition, I would like to know if this is the sensor that tells the GP...