95 New Yorker running on 3 of 6 cylinders

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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 an

EvergreenMktginc in Issaquah WA

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Jun 14, 2018

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1 Reply

Popular Answer
DaveJMon Jun 14, 2018

Hello, all I have to do is stop at "block sealant". I'm sorry but trying to "fix" a major problem by using some kind of sealant is an invitation to major issues. The initial issue has not been resolved, and others may have been created. How did you test it "running on 3 cylinders"? Are you monitoring via a cylinder balance test? Did you run a relative compression test, or a base engine compression test? You have major compression variances, and not sure what your leak down concern was. You may actually need an engine replacement at this point. This forum isn't about guessing, it's about providing proper advice on how to best approach your concerns. This vehicle needs professional guidance by someone with proper tooling, skill, reference materials and know how. At some point, the "back yard mechanic" part can't deal with the serious nature of the concerns you have. This is why there are major financial investments by repair shops and technicians everywhere to have the skill and tools they need to diagnose and repair vehicles. I appreciate your concern as someone who is trying to do something without spending much money -- clearly -- but this vehicle is way past trial and error. Good luck.

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