Shawn_65

When I start my L98 up in the morning cold I get this sputtering sound that sounds like its comming from a cylinder or somewhere close. It eventually dies down after I warm the car up a little. but this just became a problem.

I just had my alternator replaced and I think it has a bad regulator so I'll have to take it back, if the gauge is correct it's constantly at 16-17 volts, which isn't good. should be like 14.5 right?

I also had the water pump replaced. However my coolant still seems to be leaking from somewhere. Maybe the coolant is leaking into a cylinder head or something I dont know, not that much of a mechanic.

but any help would be much appreciated, thanks in advanced guys! the last thing I need is another problem

rons85

"sputtering" sound? AIR pump? Unplug the two control solenoids and see if it still does it..

coupeguy2001

look down at your harmonic balancer with a flash light. if you see any rust in front of the ring, your balance weight is rubbing the timing cover.

AGENT 86

I would be looking at the high alt voltage first. Do you have a multi meter so you can take a measurement at the battery, when the motor is running ??

mseven

at OT I usually see the volts at around 13.8-14.0. Having a higher alt. output can have an effect on the fueling on your 90 (in tables inj. offset vs. battery, higher voltage=less PW), which could then have an effect on the parameters of the tune.
As 86 stated getting that in order is a good first step, however sputtering could be many things, check AIR sys. all vac. etc.
Is coolant physically leaking on the ground/motor, or just "disappearing"?