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Cursed Blazer?

matuva

matuva

Tropical 6.5er
Messages
1,996
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21
Location
New Caledonia. An island in south west pacific, cl
Yes; sometimes I think she is... It did appear suddenly.

This evening as i was cruising back home, I suddenly heard a knock growing stronger and stronger.

Back home, it was so strong that I was afraid I broke a valve or a rod.
She then smoke raw fuel...

I hooked my scanner (GMTDScantech) and found a DTC about calibration resistor error, and one about pedal position error.

I believe these codes have nothing to do with my problem. I change the settings on my chip, switching from towing tune to economy, no luck.

Then, using the injector balance feature, I disconnected the injectors one by one. As soon as I disconnected injector # 2, she stop knocking and
smoking. As soon as I release it, she knocks again and smoke raw fuel.
I took her for a drive with the scanner hooked and maintaining injector # 2 shut off, and she runs almost fine, no knock, no smoke.

I was 1st thinking about broken valve, but, if it is, she would knock at any time, with or without injector cut, no?

I'm not injection specialist, but it eems injector #2 has quit. What do you think?
 
As she is my daily driver, I have to use her.

So, I have the scanner hooked and running, injecotr #2 off.

She runs not so bad, no smoke as is. I will change the culprit saturday morning, 1st thing. This 929 is eating oil, but I don't want to kill it, even though the 599 short block is on the way ;)
 
I'd be very cautious of using injectors that cheap, tends to be you get what you pay for.

What about pulling that injector and having it rebuilt?
 
If it is the same teds that buys BULK 6.x Gov take out then I would almost bet they are just good pop tested injectors out of junk motors.

They might be a good option for some to get you by while you get the stockers build.
 
red said:
I'd be very cautious of using injectors that cheap, tends to be you get what you pay for.

What about pulling that injector and having it rebuilt?
Click to expand...

They are rebuilt ones, said BOSCH rebuilts. For now, I will replace the #2 with a "used but good" one coming from spares of my mechanic.

I'm on the way of rebuilding a 599 (was supposed to be a 141 and ending to be a 599). On this new engine, I will put brand new BOSCH or Delphi.
 
tanman_2006 said:
That sucks, hope the piston didnt let go...
Click to expand...

I'm afraid it does....:(

We pulled the head and did not remark something specila on #2. A rocker retainer was going south on intake valve rocker #4.

To get suren we replaced head. No luck. The knocking is different with that new head, sometimes disappear, but still present when you go in rpms.
It quit smoking :???:

I have never dealt with piston rod failure or broken crankshaft. Could it be that? That did happen when I was cruising, under slight acceleration. The knock suddenly appears, and quickly grows stronger.

But what is odd, and what I don't understand is why it is different with another head???

Also, there's a kind of "concrete" on the piston and valves that I don't understand too. These piston and head were completely clea 4 months ago....

IMG_20120728_103847.jpgIMG_20120728_104129.jpgIMG_20120728_104144.jpg

My mechanic is wondering about 2 stroke oil I add (TCW3 compliant)
 
With the head off you can turn the crank back & forth and see if there is any slack in the piston & or rod assy.

The pics almost look like it was running a little lean and the carbon got hot and cooked it white??
 
And remember that there is very little clearance between the valve & piston top at TDC, if the chain is wore out and sloppy, that & the carbon build up could let the valve touch the piston.
 
I wouldn't think the 2 cycle oil would do that. (concrete like stuff)

I've seen high mile gassers with oil control problems look like that. (bad rings, bores, valve stem seals)

As for your new 'noise' you will just have to explore further, you already got a good start.

Get a strong light and check the cylinder walls real good.
 
I had an old Ford 6.9 that had the "concrete" all over the valves when its engine gave out. And it was only a few years old. The guys at the machine shop said its from hard water deposits from water in the fuel. Even with regular filter changes it's possible to get traces of water past the filters.
 
This has been a weird day:

This morning, we started the engine. It was knocking very loud cold, smoking unburnt fuel. By the time it gets hotter, the knock slowly decreased and then disappeared :eek:
Reving the engine made the knocks come back, then decrease again.
Still smoking, a bit less but still smoking.

The mechanic said we should change oil and filter ( I did it already less than 1 500 kms ago). He is pretty convinced that the revitalisant cermet (Xado : http://xado.us/index.php?route=product/product&path=36&product_id=105 ) I added at my last oil change was more an harmful mess than a good thing.

I listen to him and changed oil. Took caramel for a test drive. She was knocking loud then very quickly get more quiet. Knocking lees when accelerating.

I accelerated more heaviliy, putting her under load. There was a big huggly rattle, then slight knock and white/blueish smoke for less a minute, then smoke cleared.
Still getting knocks under acceleration.
I took her for a 30 kms drive, where she was quiet and smooth as silk all along.

Drove back home and let her cool down. Started the engine again, slight knock quickly disappearing.

Took her for a 2nd drive of 10 kms, no knocks, no rattle, no smoke... :???:

After 2 hours having her cooling down, start the engine. She is a bit "clanky" than usual, but smoothen as soon as I high idle.
I will see what happens tomorrow morning after she sat all night and is cold at startup.

If it is just a problem with oil, I would have like to understand what the problem was. If no more problem, that's fine and I hope she will last at least till my new short block arrives, but I would really like to understand what did happen. : lack of oil in pushing rods, problem with IP?.... I'm a bit lost.

at least she is really cursed...:skep:
 
that "stuff" that you put in the oil probably cleaned/dislodged some sludge which is working it's way thru the engine
 
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