94 4.3 blazer running on 3 cylinders

Comcastian · 05-04-2005, 06:19 PM

Hey members been a big help, Hey BlazeLT , My friend and I went over the truck the other night he seems to think the egr valve may not be the root of the problem, while trouble shooting we noticed that the truck runs the same with the wires disconnected on the right side facing engine, while the left side manifold is hot the right side manifold is cool to touch, any suggestions, been reading many of your posts cpi and nut kit ect, thanks in advance for your time...

BlazerLT · 05-04-2005, 07:11 PM

Quote:

Originally Posted by Comcastian

Hey members been a big help, Hey BlazeLT , My friend and I went over the truck the other night he seems to think the egr valve may not be the root of the problem, while trouble shooting we noticed that the truck runs the same with the wires disconnected on the right side facing engine, while the left side manifold is hot the right side manifold is cool to touch, any suggestions, been reading many of your posts cpi and nut kit ect, thanks in advance for your time...

Have you removed the EGR valve to check yet?

Best to check it first seeing it is free before you spend the money for an injector and nutkit and upper plenum gasket.

Is it idling bad but yet will drive fine?

Comcastian · 05-04-2005, 07:40 PM

Quote:

Originally Posted by BlazerLT

Have you removed the EGR valve to check yet?

Best to check it first seeing it is free before you spend the money for an injector and nutkit and upper plenum gasket.

Is it idling bad but yet will drive fine?

Yes it is idling bad , however when you get to higher speeds it seems to run better but the gas mileage woof. thanks

BlazerLT · 05-04-2005, 07:52 PM

Quote:

Originally Posted by Comcastian

Yes it is idling bad , however when you get to higher speeds it seems to run better but the gas mileage woof. thanks

That is a telltale sign of a piece of carbon blocking the pintle open.

Removing the electrical connector will not change anything seeing the valve pintle is physically blocked open with a carbon chunk.

Remove the valve, clear out the piece of carbon, spray the inside portion of the valve liberally with TB cleaner and reinstall with a new EGR gasket.

Then reset the computer by pulling the negative battery cable for ten minutes and you should be fine.

Comcastian · 05-04-2005, 08:58 PM

Quote:

Originally Posted by BlazerLT

That is a telltale sign of a piece of carbon blocking the pintle open.

Removing the electrical connector will not change anything seeing the valve pintle is physically blocked open with a carbon chunk.

Remove the valve, clear out the piece of carbon, spray the inside portion of the valve liberally with TB cleaner and reinstall with a new EGR gasket.

Then reset the computer by pulling the negative battery cable for ten minutes and you should be fine.

This weekend the egr valve is coming off hell or high water(lol). However I am still puzzeled why The intake manifold is cold on the right side and the left I can cook an egg on. Please enlighten me how this could be. Thanks LT .

BlazerLT · 05-04-2005, 09:06 PM

Chances are those cylinders are being choked with exhaust and cannot fire properly due to not enough oxygen being there.

You should not drive this truck anymore until you have fixed this.

You are doing damage to the engine.

Fix it tomorrow or don't drive it or you will soon be doing more than just an EGR valve.

Comcastian · 05-04-2005, 09:22 PM

Quote:

Originally Posted by BlazerLT

Chances are those cylinders are being choked with exhaust and cannot fire properly due to not enough oxygen being there.

You should not drive this truck anymore until you have fixed this.

You are doing damage to the engine.

Fix it tomorrow or don't drive it or you will soon be doing more than just an EGR valve.

You are the man, looked at your car domain site nice ride good luck with the new sound, agree with you their money always doesnt mean better...Parked the truck yesterday after we looked into the hood, wife has been driving me to work, will let you know how things went this weekend. Again thanks for the patience , and the enlightenment...have a good night...

rlith · 05-05-2005, 06:25 AM

Just a note when you do the EGR... Use a wire brush and carb cleaner... Pick out any carbon on the manifold side of the egr passage... Then run the car for a minute while reving it to blow any loose carbon out.

Actually this would be a good time to run some seafoam through the system to try and clean up any other carbon in the system (and since you would be running it for a minute or 2 without the egr, the additional loose carbon should be blown out)..

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