Burning Oil?

[psychos2]

My mechanic who's an former isuzu engine specialist told me that isuzu engineers oversight the facts that the ducts the oil runs throughtout the engine were too big & too few of them so a considareble amount of oil goes into the combustion chamber which shouldn't be happening,specially on high RPM's situations such as be in the highway or express ways when the oil pump pumps high amounts of oil as per demanded by the engine.

This problem is found in almost all 1998 to 2001 engines my mech told me,he had more that 200 isuzu troopers,rodeos & 2001 axioms just in his shop & about 3 vehicross (included mines) which had a few sticky lifters due the lack of use.

1st , most of the oil consumption issues are pcv valve related. There is no baffle in the valve cover to keep the oil away from the pcv valve and when it sticks open the oil is sucked into the intake and burned. Has nothing to do with oil passages. Had it happen to me I was using 1 qt per 3000 miles ,when the pcv valve stuck I used 2 qts in 1000 miles. I no longer have a pcv valve. back to 1 qt per 3000 miles.And no worries about when it the pcv valve will stick again.

2nd ,there is no way any vx with a 3.5 has stuck lifters. they do not have any. They have the camshaft in the head directly above the valves, I believe it is called a direct attack setup. No lifters ,no rocker arms.

also in 2002 they came out with the direct injection 3.5 which has more hp because the fuel is injected directly into the cylinders. I believe this engine is not a direct swap and you would have to change the wiring harness and computer.
I am in no way trying to start anything just correcting incorrect info. shawn

[Gussie2000]

1st , most of the oil consumption issues are pcv valve related. There is no baffle in the valve cover to keep the oil away from the pcv valve and when it sticks open the oil is sucked into the intake and burned. Has nothing to do with oil passages. Had it happen to me I was using 1 qt per 3000 miles ,when the pcv valve stuck I used 2 qts in 1000 miles. I no longer have a pcv valve. back to 1 qt per 3000 miles.And no worries about when it the pcv valve will stick again.

2nd ,there is no way any vx with a 3.5 has stuck lifters. they do not have any. They have the camshaft in the head directly above the valves, I believe it is called a direct attack setup. No lifters ,no rocker arms.

also in 2002 they came out with the direct injection 3.5 which has more hp because the fuel is injected directly into the cylinders. I believe this engine is not a direct swap and you would have to change the wiring harness and computer.
I am in no way trying to start anything just correcting incorrect info. shawn

By the way i replace the PC valve the day i had my VX oil change the 1rst time,still oil compsumtion keeps happening,so no,oils goes into the combustion chamber & burn,the piston rings were manufactured with wrong specs,that's exactly what the mech was explaining me;I'll print your intup & take it to him so let's see who could be wrong.

[psychos2]

By the way i replace the PC valve the day i had my VX oil change the 1rst time,still oil compsumtion keeps happening,so no,oils goes into the combustion chamber & burn,the piston rings were manufactured with wrong specs,that's exactly what the mech was explaining me;I'll print your intup & take it to him so let's see who could be wrong.

I am sorry but you did not say that re read your post! I have had issues with the pcv valve, and that is that. I still lose 1 qt every 3000 miles , and would consider that normal. When the pcv valve sticks and I lose 2 qts in 1000 miles that is not normal. And doing what I have done to get rid of the pcv valve has brought it back to 1 qt every 3000 miles and that is fact , not what someone told me. So I do not care if your mechanic says I am wrong I know that my problem is fixed . And be sure to print out your post and ask him if that is what he said. shawn

[Gussie2000]

I am sorry but you did not say that re read your post! I have had issues with the pcv valve, and that is that. I still lose 1 qt every 3000 miles , and would consider that normal. When the pcv valve sticks and I lose 2 qts in 1000 miles that is not normal. And doing what I have done to get rid of the pcv valve has brought it back to 1 qt every 3000 miles and that is fact , not what someone told me. So I do not care if your mechanic says I am wrong I know that my problem is fixed . And be sure to print out your post and ask him if that is what he said. shawn

Ok,let's not get passionate about this one my fellow VXer,i quite sure this issue has been on the table many times.

However i use the word lifters to explain my self somehow & the mechanic just brief me about the oil compsumtion & the experience he had in the past & what can be the possible reasons the engine's burning oil.

My warranty covered all the cost,i just went & drove off out the shop.

Yes,it's normal to have some sort of oil loss between oil changes,we all agree in this one.

I believe that if the PCV wasn't necessary for all modern engines then why is there for ? probally i'll follow you on the PCV issue & get rid off it so i may be able to loss less oil as you do.But my VX doesn't burn as much as 1 Qt every 2000 miles

The noise i had in my engine was the tipical ticking noise,right at the top of the engine,my mech solve the problem & the engine runs as quiet as you can imagine the work is covered with 50.000 miles or 5 years.

I regret not to step by at the shop & had a look at the open engine so i can gain more knowledge about how the isuzu 3.5L engine works.

Plus your input was refered in your personal experience agains my mechanic.Your believe the problem was solve by getting rid of the PCV,my problem can be the rings or otherwise,who knows.

What the mech meant afterall is that isuzu fail to support its customers by ignoring the issue,they turn their back on you,me & all the rest of us whom purchased their products.

I not sure,but i think the engine you are talking about is the 2004 3.5L with the direct injection system that came with the axioms which really needs the ECU software upgrade & the wiring harness replaced if you want it in the VX

If i had the opportunity i'll deffinetly drop a 2004 engine into the VX.

[Ldub]

Ok,let's not get passionate about this one my fellow VXer,i quite sure this issue has been on the table many times.

However i use the word lifters to explain my self somehow & the mechanic just brief me about the oil compsumtion & the experience he had in the past & what can be the possible reasons the engine's burning oil.

My warranty covered all the cost,i just went & drove off out the shop.

Yes,it's normal to have some sort of oil loss between oil changes,we all agree in this one.

I believe that if the PCV wasn't necessary for all modern engines then why is there for ? probally i'll follow you on the PCV issue & get rid off it so i may be able to loss less oil as you do.But my VX doesn't burn as much as 1 Qt every 2000 miles

The noise i had in my engine was the tipical ticking noise,right at the top of the engine,my mech solve the problem & the engine runs as quiet as you can imagine the work is covered with 50.000 miles or 5 years.

I regret not to step by at the shop & had a look at the open engine so i can gain more knowledge about how the isuzu 3.5L engine works.

Plus your input was refered in your personal experience agains my mechanic.Your believe the problem was solve by getting rid of the PCV,my problem can be the rings or otherwise,who knows.

What the mech meant afterall is that isuzu fail to support its customers by ignoring the issue,they turn their back on you,me & all the rest of us whom purchased their products.

I not sure,but i think the engine you are talking about is the 2004 3.5L with the direct injection system that came with the axioms which really needs the ECU software upgrade & the wiring harness replaced if you want it in the VX

If i had the opportunity i'll deffinetly drop a 2004 engine into the VX.

The PCV (Positive Crankcase Ventilation) valve, came about sometime in the sixties IIRC, it was a measure taken in an effort to reduce air pollution.
Before that, excess crankcase pressure was vented into the atmosphere through "breathers", either on the valve covers, or sometimes through the oil fill cap...

This has been a presentation of "Your internal combustion engine & you, the early years"...

[psychos2]

It is not so much the fault of the pcv valve as it is the fact that there is no baffle to stop the oil from being sucked from the valve cover. In other engines the failure of the pcv valve does not have the same affect as it does in the 3.5 . shawn

[Jolly Roger VX'er]

My own personal experience has taught me that there was a double-edged sword involved with oil consumption in my engine.

The EGR Valve..if not properly recirculating exhaust gases back into the cylinders to be reburned (EGR=Exhaust Gas Recirculation) under normal operation, would lead to higher cylinder temps. Just like if you were to block it off and deny proper operation.

When the EGR is functioning properly, it is "smothering" the cylinders with spent exhaust gas that is meant to be reburned for environmental sake and therefore not letting in a totally fresh air/fuel mixture during the intake stroke. In effect...it is lowering the efficiency of each cylinder. Make the EGR inoperable either through failure (ie.stuck closed) or physically blocking it off and the cylinder temps go up due to the more efficient combustion of a fresh air/fuel intake charge not being smothered by exhaust gasses fed into the cylinders through the intake by the EGR.

Then...add in a malfunctioning PCV which leads to high crankcase pressure that "resists" the oil in the cylinder attempting to return back to the oil pan.

Now that you have oil lingering around in the cylinders due to opposing pressure of a stuck PCV and higher cylinder temps due to a stuck EGR you get alot of oil burn-off during the combustion process.

In short...My VX started using oil before I supercharged it at 30,000 miles; and after I cleaned out the EGR with oxgen sensor safe carb cleaner to remove the black carbon that was causing it to stick closed....and after I started changing the PCV at regular intervals to maintain proper operation....the oil usage dropped drastically to what I consider normal (approx. 1/4 quart in 3,000 mile oil change interval....sometimes less)

I recommend cleaning the EGR @ 30,000 mile intervals...or replacing it if cleaning it doesn't free up a stuck valve. I recommend maintaining proper operation of the PCV.

If there is an oil ring problem..it will only be exaggerated by the failures of either the EGR and/or the PCV systems....think of all this as a triangle...where you have control over 2 of the 3 legs.

[Jolly Roger VX'er]

This has been a presentation of "Your internal combustion engine & you, the early years"...

ouch...your making me experience flash-backs of a black & white 8mm tape reel movie on an old projector with some monotone sounding guy chirping away making my eyelids real droo---oooo---pppie...zzzzzzzzzzzzzzzzzz