Engine stumble while accelerating

I would stop messing with the the timing and your carburetor and the distributor also. you say ayou have a tick on the drivers side? not your running problem... but i bet you need to chefck oil pressure / oil flow on dirivers side bank. pull your valve cover off the the drivers side and see if if your rockers are getting oil.

I bet you have some cam bearings on the way out. I would strongly suggest checking on that right away.

 

Hey Larry, I had the Crane kit on my last car so I'm pretty familiar with it. My dwell meter is pretty simple but it's also pretty old. I got it off of G-Body Dave (God rest his soul). I was going to take a picture of it to show you I'm not mistaken on my reading but the battery is dead on my camera. I guess it could just be reading wrong.

Yeah, sure Rob. Stop messing with it after I've done replaced everything. p
I'll pull that valve cover off this week. I do know that when I put my hand down around the manifold I feel some air between the 3 and 5 cyl. area. Is there a way to put a long screw driver to my ear and listen for anything on certain parts of the block?
MARK

 

Dwell Meter

Here's the dwell meter.

 

Mark,
What did that broken wire you found go to? If it isn't needed get rid of it. If it is, replace it. Shorting out your coil to the valve cover isn't going help solving this dillema at all.
When you are setting you timing, how steady are the light strobes from your timing gun? It doesn't seem to be missing at all does it? In Park? Reverse?

The black goop you found on the original dist. is used to lubricate the shaft where the points actuating arm rides. It is needed. I believe it's also non-conductive to keep you from shorting out to ground through the distributor itself.

I know this is kind of dumb, but you are setting dwell before making your final timing adjustments.

 

I'm not sure where the broken wire goes too. I remember reading somewhere about the braided wire that goes to the coil but I don't remember what it's for. I think the other wire it splits off with goes to the starter.

The first thing I checked was the dwell after I found TDC. It was reading 45*. I adjusted the points gap then rechecked. Then I finished setting the timing. I haven't rechecked the dwell since.

Man I've learned a butt load of information from this single thread so far. Thanks ya'all.

 

I would pull the drivers side cover and just make sure there is a good amount of oil coming through the rockers. when the front cam bearing spins(commmon to these motors) it will cut off the oil pressure to the drivers lifter gallery. then you will hear a tick in that sie only because the lifters on that side are not pumped up with oil.

 

The light is very even and doesn't miss at all. I set the timing in Park.

I should see oil flowing at idle or do I have to rev it up a bit?

 

should make a little bit of a mess after awhile with the valve cover off.

 

popping problem during acceleration

Hello I've read your entire post and I'm having the exact same problem out of my 79 linc mark v (please don't ban me o No: ). I did everything that you've done including completly replacing the timing chain,fuel pump, carb, vaccum advance, etc. I'm actually completely out of ideas myself, but one thing that I have heard from a couple of different shops around town here, is that it could possiblly be a valve job that needs to be done. My uncle says that it probally not, but with the money that I've stuck into it I'm simply run out of options. It's either that or a complete rebuild and I hate to do that. As I try to get the money together to possiblly do the valve job or rebuild, if I reach a conclusion before you do I'll definately let you know. I thought that it was just a problem that happened with FORDS (Fix Or Repair Daily S***), but please keep me posted on anything that you may come across, also double check the routing of the lines to you carb. Good luck, fatboybuick :beer

 

I pulled the valve cover off this morning and after the motor warmed up a little bit there was a steady flow of oil on the rockers. It didn't make a mess though, just flowed slowly.

Hey fatboybuick, I love the old lincs (like the new ones too)! I guess the final "cure" was to replace the dist. It must have had enough of a wobble to make it miss.
MARK

 

So, the new distributor fixed the problem? Guess I don't have to buy it then. :TU:

Dave B

 

quick question

Can you tell me what is the normal operating range for engine vaccum? I just got mine to maintain about 15-17psi. Is this normal? Congratulations on getting yours correct. :TU:

 

Sorry Dave, I'm keeping the distributor. :laugh:

I have often wondered if my cam is stock but I don't want to tear down the motor just to find out. I get about 16 to 18 in/lb in park at 750 rpm.