Intermitten Misfire 1986 c4
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2nd Gear
Joined: Mar 2023
Posts: 2
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Intermitten Misfire 1986 c4
Hi guys this is my first post on here but I've been having some issues with my 1986 c4. This past summer I did an entire ignition tune up including new distributor, plugs, and wires, as well as recently having replaced my fuel pump and fuel filter. This being said I am having some kind of what I assumed to be a fuel issue due to the car starting to run oddly out of the blue the other day. I started it up and as soon as I got driving I could tell that I had some loss of power and while holding the accelerator at a constant position I can hear the engine flutter as if it is only firing 7 cylinders and is trying to fire the 8th. Also recently over the past few weeks I've been hearing a ticking sound coming from the engine bay which has been incremental with rpm but only audible at around idle, and I presumed that it might have been an injector starting to go bad. The moment it started acting up the ticking stopped being audible so I figured that it may have been a bad injector. To be sure I ohmed out my injectors and found them all to still be at either 14 or 15 ohms, which is a little low because I believe they should be at around 16 ohms. I also listened to each injector with a stick held to my ear and could still hear them all ticking. Let me know what you guys think as of right now I'm thinking its probably a clogged injector but I don't know how to explain the intermittent ness of the misfire and would assume that it would just fire 7 consistently. Maybe that one clogged injector is just leaking as well? let me know any ideas you have.
1st Gear
Joined: Aug 2023
Posts: 1
Likes: 0
Hi guys this is my first post on here but I've been having some issues with my 1986 c4. This past summer I did an entire ignition tune up including new distributor, plugs, and wires, as well as recently having replaced my fuel pump and fuel filter. This being said I am having some kind of what I assumed to be a fuel issue due to the car starting to run oddly out of the blue the other day. I started it up and as soon as I got driving I could tell that I had some loss of power and while holding the accelerator at a constant position I can hear the engine flutter as if it is only firing 7 cylinders and is trying to fire the 8th. Also recently over the past few weeks I've been hearing a ticking sound coming from the engine bay which has been incremental with rpm but only audible at around idle, and I presumed that it might have been an injector starting to go bad. The moment it started acting up the ticking stopped being audible so I figured that it may have been a bad injector. To be sure I ohmed out my injectors and found them all to still be at either 14 or 15 ohms, which is a little low because I believe they should be at around 16 ohms. I also listened to each injector with a stick held to my ear and could still hear them all ticking. Let me know what you guys think as of right now I'm thinking its probably a clogged injector but I don't know how to explain the intermittent ness of the misfire and would assume that it would just fire 7 consistently. Maybe that one clogged injector is just leaking as well? let me know any ideas you have.
Pro
Joined: Feb 2009
Posts: 655
Likes: 164
From: Vancouver Washington
Since the ignition system was the last thing you touched I would go back and make sure all of the connections are correct. Especially the plug wires. Loose plug wires will give a click/snap sound.
