575 SCI problems ????
 

anybody experienced any problems with there 575 SCI Blown Throttle body Injected 2001 ,running really rich -using lots of Oil ..fuel pressure is dead ballz on & no computer codes ..
thanks in Advance :drink:

575sci
 

Oil consumption I would look at rich condition causing a fuel/washout or worse a hole in piston depending on how much is alot? compression/leak test.
Rich condition can be several items but when I worked at GM we had some issues with the truck style throttlebodies merc used with 575's injectors failing, ohm test them or use a timing light to see the spray pattern.
Place to start.
Thumper

Not sure of what started the problem, but oil consumption and rich means it could have washed a cylinder or two. If the rings arn't sealing, it can eat a quart a day. I burnt a couple of pistons in the past and had oil everywhere outside the engine with a 3/8" hole.

How many hours on them ?

Fresh 10 hours :drink:

Fu(k it. Start over. Tear em down and tell the guy he should have come to you first. :party-smiley-004::evilb:

Sounds like more than 1 problem in there to me, but busted piston sounds pretty close. Is it blowing by.

They do tend to run a little rich, especially when cold.

10 hrs. and using oil....something sounds f'ed up.

Jacked up rings or washed down cyls ??

Mine ran til 388 hrs before one of them lost a head
gasket, and either of them never used any oil between
change intervals.

I do remember someone on here having a
fuel consumption problem,( rich) and it ended up
being an unplugged I.A.T. sensor.

If they were run really rich for more than a little while then they are frined anyway.

How does the oil smell. Does it have fuel in the oil?

575
 

Yea all that!!!
10 hrs under load can be very bad to a motor not running correct.

she loses 1 quart of Oil an hour , may be leaking right out the oil cooler and straight out the tailpipe
Unplugged sensor i will check on

Did it just start doing it or was it doing it for 10hr? Have you looked at any thing yet like the plugs yet. A bad map sensor could make it run crazy rich some times and still be within its programmed range and not set a code.

Something else came to mind....don't know
how much it would effect it though, but I'll
throw it out there.

Did they put the valley tray ( baffle) back in ?

They have a PCV valve that plugs right into the intake
manifold between the rear of supercharger and the distributor.

If that ( baffle) is not in there, the PCV valve would
be exposed to any splash lube that might get thrown
up towards the bottom of the intake, and would certainly
suck it in.

Its only doing it one of the motors ,its def richer then rich :drink:

kind of like you :grinser010::eek::coolcowboy:

Once you figure it out, these motors do not consume oil at all. I check the oil before running them out of guilt....Something is definitely wrong.