missing / CEL
Thread Starter
AudiWorld Senior Member
Joined: Mar 2002
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From: Michigan
missing / CEL
99 A6 2.8 30 V non turbo Started missing yesterday and CEL came on. Humidity is a little high, but it wasn't raining when I first noticed it or the light came on. Misses most when cold or accelerating.
Code = Missfire # 3
Swapped plugs, still misses, still code for #3
Swapped wires, still misses, still code for #3
Mechanic thinks it is the injector. I'm running a bottle of techron through it, but he thinks it is the electrical part not dirty inj.
How common is injector failure?
Is it possible that just one part of the coil is bad?
Any other possible causes?
Code = Missfire # 3
Swapped plugs, still misses, still code for #3
Swapped wires, still misses, still code for #3
Mechanic thinks it is the injector. I'm running a bottle of techron through it, but he thinks it is the electrical part not dirty inj.
How common is injector failure?
Is it possible that just one part of the coil is bad?
Any other possible causes?
AudiWorld Member
Joined: Jul 2005
Posts: 201
Likes: 0
most likely a leaky injector
I had the same problem on our old Passat 4Motion. Problem easily diagnosed by scanning with VAG, then moving injector to another cylinder and re-scanning. Problem followed. Turned out to be a leaky injector. New injectors aren't terribly expensive (~$30?) and it took me less than 30min to replace from start to finish. VAG-COM more than paid for itself right there.
Swapping injectors is not terribly difficult. However, this won't do you any good unless you have a VAG handy.
Swapping injectors is not terribly difficult. However, this won't do you any good unless you have a VAG handy.
Thread Starter
AudiWorld Senior Member
Joined: Mar 2002
Posts: 1,926
Likes: 21
From: Michigan
Replies to several posters
If it had coil on plug, there wouldn't have been any wires to swap.
Next, I did swap the plugs as it said in my post
Bottle of techron in there from yesterday. Slim chance, but for $5 bucks it's worth a try. Mechanic changing injector tomorrow. I looked at it and the rail and all 3 injectors have to come up to get the center one. Also all the seals will be replaced. He estimates 3 hrs, which seems right to me. I could do it myself, but just don't have the time.
Other than knowing it was the code for missfire #3, what esle would the VAG COM have told me?
Next, I did swap the plugs as it said in my post
Bottle of techron in there from yesterday. Slim chance, but for $5 bucks it's worth a try. Mechanic changing injector tomorrow. I looked at it and the rail and all 3 injectors have to come up to get the center one. Also all the seals will be replaced. He estimates 3 hrs, which seems right to me. I could do it myself, but just don't have the time.
Other than knowing it was the code for missfire #3, what esle would the VAG COM have told me?
AudiWorld Member
Joined: Jul 2005
Posts: 201
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FYI...misfire on #1 is all I got when I had a bad injector
once I swapped the injector with cylinder #5, the problem showed up as a misfire on cylinder #5.
The problem with mine was that it was leaking. There is no check or sensor that can be made to detect this other than a decrase in mileage and rough running which in turn throws the misfire code if it's severe enough.
The problem with mine was that it was leaking. There is no check or sensor that can be made to detect this other than a decrase in mileage and rough running which in turn throws the misfire code if it's severe enough.
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