furia

Hi! I'm new here and want to begin with appologising for my horrible english

I own a Chevy Monte Carlo SS '87. Removed the old 305 and bought a LS1 from '01 Pontiac Firebird with 4L60E transmission.
The engine is in the car, starts and runs but there is a problem here :o
It uses 3-4 liters / 10km (approx. 1gal/mile?), ideling at 500 rpm, smells and smokes badly (burns my eyes while wating 30sec for the green light).
Hooking up the OBD2 I get no critical errors. Check engine light-error, no cooling fan ect... At first I thought this was air coming in between the throttlebody and MAF.. but no... Any ideas?

2000PewterT/A

Gonna need a data stream of all the PIDs to properly diagnosis this.

furia

FTR: Found the problem. Poor ground connection valvecover passenger side

BP Automotive

iTrader: (3)

It needs to be grounded to the cylinder head, not the valve cover.

furia

Everything else had good groundconnection, the valvecover (and then also the 4 coil's mounted on it) had 44ohms to the negative battery-pole..
I find that odd... Since the valvecover is bolted to the cylinderhead..?

ls1nova71

iTrader: (4)

Valve covers are not a good ground since they're insulated by the rubber gasket and the rubber seals around the bolts.

furia

From what I can see the gasket for the bolts is between the cylinderhead and the valvecover, not between the bolt and valvecover... Aaaanyway: Problem solved! And notes taken for the next engineswap

the_merv

iTrader: (88)

You aren't seeing that little rubber Grommet under the bolt Head.