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Topic: What would just cause missing cylinder (Read 2527 times) previous topic - next topic

What would just cause missing cylinder

Just wondering what would cause a cylinder to randomly start missing on a 1983 cfi 5.0 bird. Thanks for your input

Re: What would just cause missing cylinder

Reply #1 –
So its just not there all of a sudden huh?! :) Just messin , I think we need a lil more info on this though.

Re: What would just cause missing cylinder

Reply #2 –
Is it the same cylinder? Possibly a head gasket. I had that problem #2 was weak due to a blown head gasket. I would check the compression.

Re: What would just cause missing cylinder

Reply #3 –
Well it dosent miss all the time just when you want to accelerate then when you get up to speed you can tell that its firering on all 8 agian.

Re: What would just cause missing cylinder

Reply #4 –
I had very similar symptoms with my car. You could feel it when the transmission would shift and the rpms drop to 1500-2000. When trying to get the car moving from this point, you could really feel it missing. Once I got up to speed, it was as smooth as anything. It ran great but was just rough on acceleration in the low rpm range. I had low compression in the #2 cylinder and when I pulled the head, I found the headgasket was blown.

Re: What would just cause missing cylinder

Reply #5 –
A quick check would be to
remove the dizzy cover
remove the rotor
remove the ,ohwhats it called , that round thing with metal fins that passes thru the pick up or stator assy? armature maybe?

anyway, check that area for any micro debris down on that little magnet on the pickup or stator assy.

try carb cleaner


to remove micro debris from that magnet, i put a large magnet on a long narrow screwdriver.
i probed down in between where the armature passes thru the stator and picked off small particles because my magnetic field was stronger than the one on the stator iteself.  I do this once in a while as a prventative maint step.

Re: What would just cause missing cylinder

Reply #6 –
'83 is EEC III. No stator etc.
Check the plug wire and coil wire resistence. Make sure the plug wires to 7 and 8 don't run next to each other all the way from the distributor to the plugs. Separate them.

Re: What would just cause missing cylinder

Reply #7 –
uhhhh you might need spark plugs and plug wires..... but thats just my two cents

(my car stopped running cause it was acting like that new ignition fixed that..... distributor cap, rotor ,cheap plug wires, and motorcraft spark plugs...)

Re: What would just cause missing cylinder

Reply #8 –
here is a quick question.  Was anything done to this motor b4 the miss started to show up?
This such as to high or to cold a heat range in plugs will make a motor have a miss.
If fuel pump is getting week u can get a miss when under load.
Cam wearing out can still run fine till under load then u start to get miss.
Headgasket can make a motor miss but these are kinda things that show other signs as well. Bad plug bad wire,  Arcing In Cap can make a motor miss as well.

I would start by pulling the plugs and seeing how the look.
then check cap,rotor and wires. As well as gap size on the plugs.

Odds are its something simple

Re: What would just cause missing cylinder

Reply #9 –
Quote from: andrew beedle
Well it dosent miss all the time just when you want to accelerate then when you get up to speed you can tell that its firering on all 8 agian.


Did you figure it out yet?
 :dunno:

Re: What would just cause missing cylinder

Reply #10 –
I had a similar problem and all it that was wrong was one of my spark plug wires had partially seperated at the boot (I guess I pulled to hard on it), and it would randomly miss.  New wires and it was fixed.
 

Re: What would just cause missing cylinder

Reply #11 –
Quote from: jasontbird
I had a similar problem and all it that was wrong was one of my spark plug wires had partially seperated at the boot (I guess I pulled to hard on it), and it would randomly miss.  New wires and it was fixed.


I'm having this same type of problem on my '87 5.0 cougar, so I was wondering what the fix was for Andrew.  Mine just started missing the other morning when I started it up, then when it warmed up it seemed fine, but I could feel it missing under load, and at idle there was a slight "thump" feeling, like a miss.  I replaced the cap, rotor and wires (which were 11 months old).  It seemed better, but then the next morning... same thing, only now it stalls out when I put it into park.  I pulled all the plugs (autolite double platinums, 11 months old) and they were all a consistant shade of grey-tan, I cleaned them, put them back in.... no better than before.  My friend said maybe its the coil, which I've never changed before.  But I would hate to think it may be a comprimised HG.... I added a bottle of fuel system treatment into the tank, and added 17 gallons of fuel, doesn't seem to have had much of an impact.  Fuel pump has gotten a little noisy over the past month or 2, kind of makes a mild "buzzing" sound like a bee when the car is idling.  I think it's the original pump.  Fuel filter was changed maybe 1.5 years ago.


-Chris

..sorry, didn't mean to hijack this thread...