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95 New Yorker quit running
03-17-2018, 05:52 PM (This post was last modified: 03-17-2018 05:54 PM by Mr.Ed.)
Post: #1
95 New Yorker quit running
95 new Yorker, 3.5 v6, about 130,000 miles on it, Utah.
Had engine stopping problems about 6 mo. before figured out it was wiring harness not secured, fixed that, ran great for about 6 mo and then for no reason it quit, no check engine light, replaced ignition box, (was already new) still wont run, get intermittent spark in a few cylinders sometimes, checked crank and cam sensor, both good, replaced computer with a used one and still same thing, stumped and at a loss, any info or help at all would be greatly appreciated, I would just take to junk yard but the car is in great shape with new tires, nice cruiser and great fuel milage.
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03-17-2018, 08:29 PM (This post was last modified: 03-17-2018 08:58 PM by Rupe.)
Post: #2
RE: 95 New Yorker quit running
Only a few things required to get an engine running and that's fuel, spark, compression, all at the right time. Typically when something just quits at that mileage it's the fuel pump and a shot of starting fluid may get it to run for a few seconds to confirm that. OTOH, that engine also has a timing belt, which at that mileage is WAY overdue for replacement. IOW, it could have developed enough slack to jump a few teeth and now you have the head scratcher of figuring it out. Sometimes the cams don't turn at all, and you may be able to confirm that by looking in through the oil fill while someone cranks the engine. No cam movement is your clue, although you may need to remove a valve cover to see this on some years. (don't recall)

If the belt is still in place but skipped a few cogs then things will turn but timing will be off, spark may be intermittent, and certainly compression will take a hit, so that may be another test to confirm the problem. It may also cough out the intake or pop in the exhaust during cranking.

Dig a little deeper and bring us your findings then we can chat more.

Edited to add: That engine does NOT bend valves if the cam belt takes a dive. OTOH, that engine is prone to oil sludge / deposits and overheating due to water pump impeller wear, (plastic impeller) which often cause other internal wear issues. IOW, if you tear into this keep an eye open for things that don't seem right or might lead to spending more on repairs than the car is worth.
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03-18-2018, 04:04 PM
Post: #3
RE: 95 New Yorker quit running
I checked the timing belt first thing it was replaced at about 100,000 mi, replaced fuel pump less than a yr before this problem also checked fuel pressure, checked the crank sensor yesterday, working like it should, compression is around 125 or close to that in all cylinders, I got compression and fuel and little or no spark, seems to be in just front 2 cylinders, sparks then stops and sparks once again when I turn the key from start position sometimes, checked wire continuity on wires going to the ignition box from the computer, no breaks, also checked most of the wires from the connection plugs to computer all seem to be good, wondering if its just the computer and the used one I got has the same problem? but shouldn't that have thrown a check engine light?
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03-18-2018, 04:24 PM
Post: #4
RE: 95 New Yorker quit running
The drawback to using the CEL is a problem needs to be present for a period of time, say 10 - 20 seconds, to set a code. If it just quit as you stated, then you are back to old school diagnosis. The intermittent spark you speak of when working the key is normal and only happens because you are switching the power on and off, just like the engine sensors do. From where I sit it sounds like you are missing the spark trigger so what about the cam sensor, the ignition module, and any relays in the circuit? Have you checked all of the fuses with a test light?
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03-18-2018, 05:15 PM (This post was last modified: 03-18-2018 05:43 PM by Mr.Ed.)
Post: #5
RE: 95 New Yorker quit running
thought I checked the cam sensor before but will do it again, no blown fuses, wondering about maybe a bad relay? will let ya know the results, thanks for input! replaced the ignition module a few yrs ago had a warranty so I replaced it again when it quit.
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03-18-2018, 05:52 PM
Post: #6
RE: 95 New Yorker quit running
BTW, with your history of a wiring harness problem you may need to visit that again.
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03-19-2018, 10:53 AM
Post: #7
RE: 95 New Yorker quit running
On Rupe's theory of the wiring harness, how about the ignition switch? If it isn't sending power and ground to the proper places you won't have spark. Also remote starters and security systems can cause you to loose spark.

What type of ignition system does that have? I had a Chrysler V6 with the 3 coil packs. 2 cylinders died on mine. I replaced the coil pack for those 2 cylinders and still didn't have spark. I traced the wires from that coil pack back to the computer. With some research I found that there were 3 "Coil Drivers" in the computer. Once I knew how it worked it was easy to test and see that the coil driver was not sending a signal to the coil. So if you have that type of system you can check the computer before replacing it. Could save time and money because you aren't just changing things hoping to hit the right one.

Please keep us informed.

Thanks for using the forum,
Garner

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03-19-2018, 05:02 PM (This post was last modified: 03-19-2018 05:18 PM by Mr.Ed.)
Post: #8
RE: 95 New Yorker quit running
it does have the 3 coil pack I changed that out when it first quit, replaced the cam sensor today, got the 8+ volts power to it but getting 3+ volt on the return wire going back to the computer (not the ground wire) not sure what that's supposed to be. I've checked the wiring harness more than once, got good connections and tested continuity from sensors to computer no sign of broken wires, just keep thinking it's the computer, read somewhere awhile back where 2 drivers went out on an Intrepid computer, hate to junk it but looking like the cost to fix it is going to exceed the value of the car.
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03-19-2018, 09:36 PM
Post: #9
RE: 95 New Yorker quit running
If you really feel it's the ECM, try Rock Auto. (on line) They have them for $160. (plus $60 core) Granted it's a reman unit but also preprogramed so saves you a bit of hassle. You'll have to read the fine print for electrical returns before you make up your mind.
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03-20-2018, 11:34 AM
Post: #10
RE: 95 New Yorker quit running
I checked them they don't have the right part number, 4606190, seems to be a hard one to find.
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