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MSD · 11-23-2003, 10:16 PM

'93 Lincoln Town Car - Executive Series w/ Limo package (not stretched, but can be done)
4.6L OHC and 4sp auto OD transmission
Transmission is new, engine is original. Almost 200k miles
Nothing modified

Diagnostic computer reveals the folloiwng:
-Cylinders 3,5,8 failed cylinder balance test
-Error codes point to lean air/fuel mixture due to faulty EGR valve
-Coolant temperature sensor is running at higher than maximum allowed voltage.

Two major problems:
1: When the engine is warm, antifreeze will leak out of the cooling system as quickly as I put it in, but water won't. This is mind-boggling. I'm going to flush the radiator, refill, and check for leaks tomorrow.

2: The enging backfires severly after it is started. The problem is worse on humid days. If I put it inot neutral and floor it for 10 seconds, it seems to clear up. If driven normally, it clears up after 2-10 minutes of driving (about the same tiem that the engine warms up.) The problem briefly disappeared when I replaced spark plugs (not wires,) then got worse, got better again when I whacked the EGR valve with a wrench after two error codes pointed to a sticky EGR valve. The problem also improved briefly after I replaced the fuel filter.

I need a new car, don't I?

11-23-2003, 10:16 PM	#22 (permalink)
MSD The sky calls to us ... Super Moderator Location: CT	'93 Lincoln Town Car - Executive Series w/ Limo package (not stretched, but can be done) 4.6L OHC and 4sp auto OD transmission Transmission is new, engine is original. Almost 200k miles Nothing modified Diagnostic computer reveals the folloiwng: -Cylinders 3,5,8 failed cylinder balance test -Error codes point to lean air/fuel mixture due to faulty EGR valve -Coolant temperature sensor is running at higher than maximum allowed voltage. Two major problems: 1: When the engine is warm, antifreeze will leak out of the cooling system as quickly as I put it in, but water won't. This is mind-boggling. I'm going to flush the radiator, refill, and check for leaks tomorrow. 2: The enging backfires severly after it is started. The problem is worse on humid days. If I put it inot neutral and floor it for 10 seconds, it seems to clear up. If driven normally, it clears up after 2-10 minutes of driving (about the same tiem that the engine warms up.) The problem briefly disappeared when I replaced spark plugs (not wires,) then got worse, got better again when I whacked the EGR valve with a wrench after two error codes pointed to a sticky EGR valve. The problem also improved briefly after I replaced the fuel filter. I need a new car, don't I?