I currently have a 83 d150 slant six. I've been having alot of trouble starting it. I changed coil, ignition, changed the pickup and looked at the distributor and everything looked good. All the connections are good. Took it to a electrical guy to check it out and he overlooked everything and he suggest that it's the timing chain it's loose and it's jumping reason why I won't start. So If I replace the timing chain should I replace the gears as well? If timing is jumping should I check anything else? How would I go by timing it as well. And must I remove the oil pan or will loosening the 4 bolts be enough? Thank you

A worn timing chain and worn timing gears can result in poor engine performance but it is not likely that will prevent an engine from starting.
Questions:
1) Does the engine absolutely not start and run or is it just difficult to start?
2) Does the 83 slant motor still have the Lean Burn ecu controlling the ignition timing?

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

It doesn't start at all now. It sparks great. No lean ignition also installed a hei module instead of the stock for ignition

I am having the same problems on my '64 Valiant. Watching.

One thing to check (yes, this is embaassing), but on my truck I had the firing order one cylinder off at the distributor cap and that kept it from running at all.

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Joe Hoppe

71 D100 225 Super Six 727 AT on 2008 Crown Vic CopCar frame

64 Valiant Wagon 225 904 AT 3:23 8.75"

Interesting what's the order so I can check. It's strange though because it was running and it just stopped and didn't start one day and now I'm stuck

Yes verify that the spark plug wires are routed correctly
Then, do you have a voltmeter?
Verify that you have 12v at the coil positive with the key in the
Crank and Start position.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

The order is correct which side is the coil positive?

the terminal that has a wire leading to it from the main wiring harness.
most coils also have a + or - molded in at each terminal.

check for voltage with the key in the start ( or crank) position and the run position.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

He had a thread about all his ignition issues not long ago...... all this was in there.

Coil is good also. Something mecanical maybe?

did you verify there is voltage at the coil with the key in the start and run position?

Asking as my 83 D150 had a similar no start issue back years ago. Found that it would start with a hot wire ran directly to the coil positive.
After much checking found that there is a fuseable link in the wiring harness that had blown.
as that was a sudden no start, similar to your issue, trying to trouble shoot that.

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

Where was the fuseable link located at? Inside the cab or engine compartment? I'll check that next

Fusible links (3 or 4) are on the Drivers side inner fender. Looking at your picture in the other thread it would be in the big roll of wires that has been all taped up just in front of your main harness plug at the firewall.

2 fusible links go to the ignition switch. Does engine crank? Do accessories work when key is turned on? Fan motor,
wipers...?
1 goes to the headlight switch - Do headlights work?
1 goes to the large Black(main feed) wire on the alternator- Do you have 12V over at the alternator main lug ?
If the answer to all these questions is yes, then I think all the fusible links are OK. I am no electrical expert at all, and someone please correct me if I'm wrong. I just want to help him get this started.

Did you check the + 12v at the coil as Dadtruck said?
Plus side of the coil should be a red # 14 wire. It is also the same red wire that comes from the alternator and is in the wiring harness along the valve cover. Same wire also goes back to the voltage regulator.

One other thing to do just to eliminate easy stuff is plug all the vacuum lines on the carb. I see some that are open. I also see the line to your PCV valve looks like it could easily have a leak, It doesn't look like rubber hose?? Plug it at the carb temporarily till you get it started. A leak in that line won't help anything.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Find your timing mark on the balancer and set it to TDC on compression stroke. Verify if your rotor is pointing to the number one spark plug. That will tell you if your chain jumped.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Out-of-index distributor is more likely than jumped timing chain; see here.

If you want to check for a slack timing chain, that's easy; see here.

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