New to me 78 NYB on its way but please Don't tell my wife

Hey Jeff,

No EGR valve in this car. It’s blanked off

Among the crazy things running through my mind is an underside intake manifold crack or leak. It fits the symptoms in that the evenness of the idle gets better after a full heat cycle if I don’t wait too long to start the car.
A smoke machine would be nice about now... It's much easier to see the smoke and how many vacuum leaks than it is to try to pinpoint them with propane, or whatever you prefer.
 
A smoke machine would be nice about now... It's much easier to see the smoke and how many vacuum leaks than it is to try to pinpoint them with propane, or whatever you prefer.
I use carb cleaner... in tiny squirts. But a smoke machine is scheduled for Saturday
 
IIRC, you have a scope available. Put the scope on Parade/Display and set the voltages so they stay on screen during power braking. A lower spike (firing line) on #4 would help confirm the idle speed bower balance.

You could also make a quickie EGR block off from flat steel to assure that it isn't bleeding any exhaust gases. At low speed (idle/off idle) EGR will make a big difference in smooth running. At the cost of a gasket, the best test I have for you... a 4/5 gas analyzer would show higher HC's, but would be a bit subjective and easy to confuse with other problems.

Here is a fair enough overview of a dynamic compression test... I know you can research from here...
Dynamic Compression Test
Running Compression Tests - ALLDATA Support

Hope this helps


It does help and makes perfect sense as well. Thanks Jeff. Starting with the simplest first. But this looks like it will reveal the issu for what it is. But I had to sort the carb first and check for any hidden vacuum leaks. That’s next.

You’re right, by putting it on the scope, it may reveal the problem cylinder and save me some time in focusing the leak down and dynamic compression test. Only one problem with a running compression test... the frigging manifolds become lava hot in about 10 minutes.

Meantime, I’ll keep driving it and record any parallel symptoms that go with the issue of the idle degrading. And .... keep banging on that.

IE... Just changed the hose to the cruise control on a whim. I pulled it and sucked on one end while covering the other end with my finger. It was leaking slightly. No big deal and probably wouldn’t show in a smoke test.
 
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Cruise control....

Checking the car in the expressway after the last repairs to the TQ, I tried to engage the cruise. It didn’t engage. But I didn’t hit the brakes and let it coast down as I was coming to an exit.

I had set the cruise at 70. When it had coasted down to 55, the car started accelerating on its own and scared the **** out of me for a moment.

I gave it a little help and it held at 60 before I had to tap the brakes.

I just changed the hose from the booster to the cruise control unit today and we’ll see where that goes. But there’s hope for this unit.

That’s the last non working machine on this car.
 
No start issue today.

Drove to the lab for my blood work early in the morning. 2 miles

Drove home to shower and change for work. 2 miles

Drove to work. 10 miles.

Went to go to a meeting about an hour later.... no start

Had my electrical probe in the trunk so I proceeded to check the coil, ballast and ignition relay. Found power in all. Engine spun fine but I was alone so I’m couldn’t get someone to hit the start while I checked for spark. It started and ran perfectly for 3 seconds and stopped

Went to meeting

Came back after lunch.

In meetings until 6:00

Went outside knowing it would start. It started perfectly...

Need to get it to do it again...... in the shop.

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This is a simple problem. Should be easy. Getting a few parts to have on hand in the meantime. Ignition switch, relay and ballast to start.
 
Halt. Put away the DMM fefore you have half the car torn apart,
I already know the problem.

View attachment 211346
Thanks Stan....

Describe it please....what is the repair?

The P.O. had that connection with an external wire tie that I took off just before the problem started... I guess I’m the cause this time.

But I don’t understand why that big connector would fail due to engine heat.
 
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Thanks Stan....

Describe it please....what is the repair?

The P.O. had that connection with an external wire tie that I took off just before the problem started... I guess I’m the cause this time.

But I don’t understand why that big connector would fail due to engine heat.
Just a bad connection due to age. Clean it up and make sure the connection stays tight.


Don't overthink it, Jav... :poke:

:p


Went with a friend to check out an NYB as a parts car in Lehigh Acres. The kid gave up after 3 months trying to figure out why it wouldn't start and let it go for 750. After the money was exchanged, I jiggled the connector, started the car, and drove it onto the trailer....:rolleyes:
 
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Ran out of smoke juice so that got postponed. Also, had to work on some home projects and work projects at home.

But.... did a few minor things to keep moving the ball forward.

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Also, fiddled with the cruise control. It still engages slowly.... but it engages and that’s the point. Set at 60 held 57 but not reacting well to hills..... still banging on it.
 
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Going to need me one of these....

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It’s the light socket for the drivers side turning lamp. The light was full of water stains when I cleaned it up. The socket was barely hanging in there with all the rust.

Anyone out there have a spare they would part with???

Stan?

Jeff?
 
Anyone out there have a spare they would part with???

Stan?
I actually found NORS ones. Please don't ask me where. It was the most obscure website on Earth and it was several years ago. I haven't had my coffee so let me wake up first.

EDIT; I wasn't awake. The NORS ones were for the cornering lamps, not the parking lights.

Back to you, Jeff...
(I gave Jeff a box of misc. sockets. Bet he can't find them now. :poke: )
 
I actually found NORS ones. Please don't ask me where. It was the most obscure website on Earth and it was several years ago. I haven't had my coffee so let me wake up first.

EDIT; I wasn't awake. The NORS ones were for the cornering lamps, not the parking lights.

Back to you, Jeff...
(I gave Jeff a box of misc. sockets. Bet he can't find them now. :poke: )


Cornering lamps sockets are what I’m looking for.
 
Halt. Put away the DMM fefore you have half the car torn apart,
I already know the problem.

View attachment 211346


Did it again today.

One of the few thing I did yesterday, besides installing the new reaview mirror, was to studiously clean and confirm a good connection at the battery main lead to the starter.

Car ran perfectly all morning..... Went to visit my monster in law at the home with my nubile young bride; and when we got out....no start.

This time I had my multi meter, spare good spark advance computer with me in the trunk and my patient wife.

Checked for spark and found.....

No spark. Good connection at the battery main connector Stan pointed out and power to coil, ballast and Spark Advance Computer.

Sent wife to go do a bit of shopping down the street at whole paycheck.... ouch.

Was parked in the shade on the street, so I could work in peace.

Funny thing... everyone wanted to help that came by and I even got one of them to hit the ignition for me on one of my attempts and to confirm no spark....

Everything was coming up aces until I checked the pickup coil. No continuity and no measurable resistance. Aha!

Then the strangest thing happened, while checking continuity from the disconnected pickup coil lead to the spark advance computer, I had left the leads measuring resistance to the pick up on. When I got back to the multimeter... maybe 10 minutes ....I had resistance of 300 ohm at the pickup (well within spec of 150 to 950 ohms)

Plugged the pickup lead back in and she fired on the first cylinder to hit instantaneously.

Drove her home and turned off the engine. Attempted restart .... and all was fine. One hour later (after heat-soak while using another car to go order a new pickup coil.).....no start again.

When it gets here on Monday night, I may need to have one of you guys walk me through removal of the reluctor.
 
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