Misfire Problem
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,841
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From: Inver Grove Minnesota
Misfire Problem
Ok, I've had a misfire for quite some time. I changed the spark plugs and wires. I've used a multi meter on all of those components and I still am having a problem. I tracked it down to cylinder #5. I unpluged the spark plug wire and it doesn't misfire anymore. You can just tell that it is missing that cylinder. So what would be my next plan of attaqck to get the mis out?
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,841
Likes: 0
From: Inver Grove Minnesota
I just did a compression test on #5. I got 153 in 3 strokes. So I think that is good. My plug doesn't read when I ohm meter it and my wire going to that cylinder is 7.31 k ohm's.
Pro
Joined: Aug 2001
Posts: 683
Likes: 0
From: mississauga ON
What are you referring to as a misfire? I always thought of a misfire
as the air/fuel mixture not igniting....which would feel the same as
a plug wire being removed. But, you say it feels different with
the wire removed.
as the air/fuel mixture not igniting....which would feel the same as
a plug wire being removed. But, you say it feels different with
the wire removed.
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
Originally Posted by JustinD
It is like a ticking noise. Like it is detonating to soon or too late.
Intermediate
Joined: Jul 2006
Posts: 34
Likes: 0
Is it possible that you have too much valve lash? That could account for the noise and would explain why the noise goes away when you remove the plug wire. If so, the adjustment for it is fairly easy, though messy. Might want to consider having a good mechanic do it if you have not done it before because you can over tighten the rocker arms and end up burning your valve seats.
Originally Posted by JustinD
It is like a ticking noise. Like it is detonating to soon or too late.
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Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
try rerouting the #5 & #7 ignition wires. These two cylinders are adjacent to each other (obviously) but are also the only two cylinders that are consecutive in the firing order ( 1-8-4-3-6-5-7-2), this is known to be a problem at times on many cars. The spark from one wire affects the spark on the next pulse in the next wire.
Thread Starter
Safety Car
Joined: Jun 2005
Posts: 3,841
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From: Inver Grove Minnesota
So, you want me to move them away from eachother? They are all wireloomed up and not touching. But just to be safe, I can put them away from eachother. If this doesn't work do you have any other ideas of what it could be. I'm fresh out.
Last edited by JustinD; Aug 6, 2006 at 11:47 PM.
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
in the wire loom seperatoes they are also next to each other. at the least move the away from each other by changing their locations in the seperators and best case is to try to reroute both wires in some fashion to avoid as much as possible the #5 & #7 being close to each other. I know there are limitations how far you can keep the wires seperated but do what you can
Le Mans Master
Joined: Jul 2000
Posts: 6,663
Likes: 162
From: columbia city in
take the rocker arms from that cylinder and reset on another clyinder ,see what you get ,if its still happens i would check the lift of the rockers it may be a long shot but it could be a ...cam .
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Originally Posted by JustinD
Well, I'm assuming the ticking is the mis. Because it only happens when the spark plug wire is connected to the #5.
Sorry couldnt resist.Justin did you get the backfire problem fixed?-------- http://forums.corvetteforum.com/show....php?t=1410195
Last edited by ...Roger...; Aug 7, 2006 at 09:36 AM.