3 of 6 cylinders working Chrysler New Yorker 3.5
95 Chrysler New Yorker 3.5 L
Symptoms: Running fine then on side road at 40 mph stalled out. Not overheated
Trying to Run on 3 cylinders
History : Purchased in North Carolina in 2017, shipped to Seattle
Block Sealant used to fix external head gasket leak.
Runs fine for 6 months.
Objective. Before we give up and dump it rather than tear into it to replaces head gasket
Looking for your opinion as to what we missed.
Work over last 10 days:
1] No codes. Discovered a used computer not secured, replaced. Still no codes
but codes can be forced. Recognizes crank sensor and cam sensor.
2] Plugs #1 , 2, 3 black and sooty. Replaced. Within seconds of forcing eng to
run on 3 cylinders, black and sooty again.
Compression : 1]140 2] 175 3] 135 4] 125 5]160 6] 155
Plugs in 4 5 and 6 “glazed”
Replacement plugs and wires. — All plugs firing
3] Leak down test of #1 and #3, less than 2% at 80psi and up.
No leaks into cylinders or coolant system
4] Fuel pressure 39psi, with regulator vacuum off 51psi.
Fuel quality OK
5] Charging system Ok, Ground OK, Battery cable ends replaced.
6] Cooling system OK
7] MAP sensor 4.88 volts. Key on, 2 to 5 volts running
8] Timing belt index correctly via visual.
9] Two ignition coils not common to the 3 cylinders not firing.
One cylinder from one coil, the other 2 cylinders from the second coil.
10] No indication of external intake manifold leak. Vacuum reading low and fluctuating
as would be expected forcing eng to run on 3 cylinders.