Signs of Nozzle Issues

[backwoodsboy]

dead lifter

live life full throttle

that's what i'm thinking as well. the 'backfire' the o.p. noticed would lead me to think intake side, but that's just a guess.
i've also seen a lifter retainer break off causing the lifter to wipe out the cam-shaft.

 

[caladash]

Go ahead and do a compression test.
While you are in there, take a straight edge and lay it across the top of the valve stems as well as the rocker arms where they pivot.
Also, with the engine warm (if possible) try and pivot the rocker arms on cylinder 3 as if the valve were returning to seat i.e. try and force the push rod back into the lifter.
Hate to say it man but I smell valve-train issues.

In a PM could you please explain that more in depth. I think I'm tracking with you but not really!

dead lifter

live life full throttle

I did observe both rockers moving while the engine was runnning. Could it not be enough?



Also, thank you all for the help so far. Compression test, for the hell of it will be done tomorrow since I'm almost out ideas and I think everyone else is as well!! Spare forged rod motor is almost done.....oh wait, machine shop called and said my intake and exhaust valves on the heads I turned it have excessive wear and need to be replaced. Machining the heads to compensate would compromise the heads. So new valves it is. 300 freaking dollars...maybe I will win one day!

 

[mandkole]

Keep eliminating the mechanical issues affecting the chamber. Unless you've identified a clear difference of valve lift at the rockers. tight pushrods when valve should be closed, or audible valve train noise, its likely not in valve train. Id get the compression test done and also a leakdown. The compression test may show a weaker one, but the leakdown will clearly identify a chamber with sealing issues (hung valve, piston/ring damage).

I'd then pull all of the injectors, inspect/test the cups for cracks. while they are out, have them run on the bench to be sure.

Have you changed the CPS? Was thinking about the backfire and wondered if it was causing intermittent timing issues.

 

[caladash]

Did the compression test yesterday. Cylinders 1 and 5 came back at around 395 and cylinder 3, my problem child came back at over 500!! I thought I had all the oil out of that cylinder but apparently not! Valve train all looked the same on that side while cranking. Everything felt tight. Pressurized the cooling system to a little over 16 psi and it held for quite awhile. Tomorrow it's getting all put back together and fired up. Maybe all the crap I have done fixed something. If not she's getting parked and stripped down for an overhaul. New carpet, frame under coating, new fuel lines, air dog lines rerouted,and a forged rod motor. This has been quite an ordeal!

 

[backwoodsboy]

You should not be seeing numbers over 500.
I'll still with my initial though of dead lifter or damaged camshaft. I've seen severely worn/ damaged camshaft lobes cause atypically high compression numbers.

 

[OLD BLUE 04]

my cps did this when it went out twice

 

[Dieselboy.]

You should not be seeing numbers over 500.
I'll still with my initial though of dead lifter or damaged camshaft. I've seen severely worn/ damaged camshaft lobes cause atypically high compression numbers.

Ditto, I dont even think a fresh rebuild is much over 400psi

 

[2000wa250]

I've always been told that 400 is about as good compression as you get with these

 

[lincolnlocker]

425-430ish is near perfect!
live life full throttle

 

[caladash]

my cps did this when it went out twice

Please explain what was going on!


There was a crap ton of oil still in that cylinder hence the over 500 psi compression number. All others were at the 390 to 400 range!! At 192000 miles I will take it! Shame it's got PMRs!

 

[2000wa250]

How did the oil get in there?

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[caladash]

I had that injector out like 10 times. Checking cups, swapping injectors, borescope inspection and cooling system pressurization. I tried putting rags in there to soak up as much as I can but it wasn't all of it. Hand cranked it afterwards to get as much out considering the fuel that leaked into the cylinder.

 

[2000wa250]

Hmm...I'd say pull the gp and bump the starter a few times with the 52 pin connector unplugged. Then try your compression test again

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[mandkole]

Please explain what was going on!

The CPS makes everything happen on time. Erratic signals cause fuel to be injected at the wrong time. It could cause the random backfire, but I doubt its causing the steady haze when hot that you report.

For me, I would not deal with one injector at a time when dealing with larger injectors. 2% variation with 90cc is one thing, but 2% with 250/200s is another. Id get all of them pulled for test and verify cylinder sealing consistency on all cylinders.

 

[caladash]

Swapped in the CPS from the excursion and it still doing it. Hoping it would break I ragged on her out of anger today and yesterday and it runs so freaking good! Tires will break loose at 35! I hooked up AE and ran a contribution test 5 times. All five came back with #8 as usual. Contribution test came back with #3 high to low side open. Could a potential wiring issue cause this? Again, smoke goes away when #3 is disconnected.

 

[lincolnlocker]

yes, its been stated already that it could be a bad connection.

live life full throttle

 

[backwoodsboy]

Did you verify after the cylinder was purged of oil that it was in fact the cause of abnormally high compression in cylinder #3?

 

[caladash]

Well I finally got to mess with it today and double checked compression on number 3 after all the oil has been cleared out. Barely hit 300 psi. FML

Not sure what to do now...pull the motor or the head. Forged block isn't anywhere near being ready to drop in. Cylinder looked good when I scoped it. Super!!

 

[Southmike]

so when you say that nozzle broke did it just crack or did pieces fall off and smash around in the cylinder...stick in the valve etc.

 

[CSIPSD]

Hmm...I'd say pull the gp and bump the starter a few times with the 52 pin connector unplugged. Then try your compression test again

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You don't have to unplug the connector... Not sure why people always say that.

See that big relay looking thing on the passenger side firewall...

Its called a starter solenoid...

Jump it, you can turn the truck over until the batteries are dead and the fuel pump will not turn on, the IDM will not fire, the CPS will not send a signal... Not a damn thing will happen.