hey didnt urs spin a bearing?


High-Volume & High-Pressure Oil Pumps
In applications where more oil flow is desired either to increase oil flow or pressure for better bearing lubrication and cooling, an oil pump with longer or larger gears may be installed. The physically larger surface area of the gears pushes more oil through the pump at the same rpm than a stock pump. A high-volume oil pump typically flows 20 to 25% more oil than a stock pump. The increase in oil flow produces an increase in oil pressure at idle, which helps compensate for increased bearing clearances. Consequently, some people may install a high-volume pump in a high-mileage engine in an attempt to restore normal oil pressure. But oil isn't metal, and the only real cure for low oil pressure is to replace worn bearings and restore normal clearances.

http://www.aa1car.com/library/2005/us020516.htm

good reading

 

there look i fixed your post faster

 

HI!... Nice copy and paste........... but do you understand it? Probably not. lol!


Yes my 5.4 spun several bearings. Main and rod. And like I've explained this to you more than a thousand times now (I think you have ADD) that my engine builder specked out the bearing tolerances wrong. A 0.20 over crank doesn't work very well in a 0.30 over bearing very well. The MMR racing pump I had was the only thing that kept it running as long as it did due to it pumped the gap with oil. But even it could only do so much when your engine builder is an idiot...................

 

Yeah high volume pumps are just fine.... anyway my problem..... still isnt fixed

 

Have you checked out the wiring harness at all, maybe something got pinched, or is rubbing. One of the wires you had to extend?? just a suggestion, does it seem like electrical since you say fuel pressure stays up?

 

Im starting to thing it is electrical. It will do it sometimes when just cruising around, I went WOT from a stand still while dataloggin, and it didnt cut out at all, and I Let off at 100. Then I tried it again from 15mph, it downshifted and cut out so bad I had to let off. I dont get it...

 

About your engine. If your truck is mission like it was shut off and the fuel pressure is fine than I would suspect a loss of power in the PCM circuit. Unfortunately when the PCM looses power the gauges sweep. Unless it is for a short span of time. A loss of signal from one of the critical sensors, Crank and Cam will cause the miss you are describing but they should also set a code. I would go over the wiring of these two sensors and make sure that they are properly seated in the engine block and front cover. I would also check all the grounds to be sure they are clean. I would still check the PCM connector for corrosion. It doesn't take much to interfere with the current flow. The PCM also grounds via several pins depending on the circuit. A dirty or loose connector can fail intermittently.

JMC

 

I agree with you, It doesn't sound like your normal miss situation . Thats not a normal motor and coil 8 did get wet - I would swap out eight based on that.

But I don't have the equipment tuner/comp to play with to see if anything is up there..

I mean the first thought that came to mind yesterday or the day before when you first posted the problem . AND , that it was happening at WOT..

I thought it had to be fuel related .. Didn't you say it cut out after hitting rail road tracks once? Was that just a coincidence when that happened ?

 

ill check all those connections again, it was the coil on the drivers back side... i know its not that... it was just a little oil, and its not a single cylinder miss. It did it for the first time when i went over rough tracks. I let off going over them, and got back on it once i got past, i was doing about 60mph, then it cut out for a split second.

 

I was thinking something like a wire that got pinched during install and is finally starting to causse grief, are all our motor mounts still tight, maybe the motor moving more than it should and it's pulling on a wire or something. I guess though that it would be more consistant

 

I thought the same thing, but how is it not throwing any codes??? seems as if it were a loose wire or a bad connection somewhere it would throw a code. I guess this problem wants to **** me off and make me look harder.

 

If you hold it to the floor does it keep dying out? or does it seem to come back no matter what. how long does it last when it cuts out? I'm wondering if it has something to do with a power connection that cut's out do to a bad connection, might not come up as a code becuase it's just like shutting the truck off (killing the power to the PCM or something) I'm stuck on the connection thing because you said it happens often when you would go over the tracks. good luck

 

that would make me think knock sensor but only GM had those issues with the engine dieing down going over train tracks cause their knock sensors were so sensitive

 

not necessarily, it seems our trucks are very relaxed on throwing misfire codes. it has to be pretty bad for it to throw a code for my truck.

 

X2 on that, my truck damn near died in the middle of the road before i threw a single code