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3 of 6 cylinders working Chrysler New Yorker 3.5

Asked by: 31 views Troubleshooting Question

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.

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3 Answers

  1. 0 Votes Thumb up 0 Votes Thumb down 0 Votes

    Hello. Is it the “1,3,5 or “2,4,6” cylinders that are not running well? (Cylinders on the same side) If that’s the case, it sounds like a bank issue and I would take a look at the O2 sensor on the side which the cylinders are not running on. You can check the Values of the O2 sensor with a diagnostic computer and check the difference in the fuel regulations on each side bank. If the O2 sensor is faulty and it adds a lot of fuel, it to it to the bank it take care of.

    Ask A Mechanic Admin - Jun 14, 2018 |Reply

    • 0 Votes Thumb up 0 Votes Thumb down 0 Votes

      The cylinders that are not working are #1 and 3 on passinger side . #2 is on drivers side.

      Wilder - Jun 15, 2018 |Reply

  2. 0 Votes Thumb up 0 Votes Thumb down 0 Votes

    I would check that the fuel injectors are firing properly. I’m not very familiar with this era of Chrysler, but there is a good chance that this a “batch fire” system which means that the computer fires 3 injectors at a time. if this is the case, you could have an issue in the wiring that supplies those 3 cylinders. You could try spraying some starter fluid in to a vacuum hose (be careful) and see if it seems to smooth out as if all 6 cylinders fired for a few cycles. If that’s the case, you may be on your way to finding the problem. Again, I’m not very familiar with this EFI set up, but if it is a batch fire, you could essentially swap the plugs on the injectors and see if the failure follows the plugs. The compression/leak down is good enough to fire and if you are sure that you are getting spark, then there is only fuel and timing left to sort out.

    John Farina - Jun 14, 2018 |Reply


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