help misfire after header install
Thread Starter
Instructor
Joined: Oct 2008
Posts: 219
Likes: 0
From: mississauga ontario
help misfire after header install
hey guys trying to work out the kinks so when i start the car when she is cold it runs rough and throws the p3000 right away when it warms up it runs good but when i WOT it and after 4000rpm it missfires like crazy and backfires and throws the code again. so i need the experts opinon here what did i screw up lol. are the plugs cracked? wires bad? o2's bad? the rear o2's are hooked up corectly i have the plugs reversed so left plug hooked to right side and vise versa and all wiring and plugs have been checked
these are stainless works headers with cats 1 7/8 and 3" pipes
these are stainless works headers with cats 1 7/8 and 3" pipes
Racer
Joined: Aug 2001
Posts: 310
Likes: 0
From: Tomball Texas
hey guys trying to work out the kinks so when i start the car when she is cold it runs rough and throws the p3000 right away when it warms up it runs good but when i WOT it and after 4000rpm it missfires like crazy and backfires and throws the code again. so i need the experts opinon here what did i screw up lol. are the plugs cracked? wires bad? o2's bad? the rear o2's are hooked up corectly i have the plugs reversed so left plug hooked to right side and vise versa and all wiring and plugs have been checked
these are stainless works headers with cats 1 7/8 and 3" pipes
these are stainless works headers with cats 1 7/8 and 3" pipes
Melting Slicks
Joined: Oct 2007
Posts: 2,798
Likes: 8
From: It's true money can't buy happiness, but it is more comfortable crying in a Corvette than on a bicyc
St. Jude Donor '13
I was going to say wires or cracked plugs but since you found two cracked plugs you're on the right track. The wires though almost always get destroyed if they've been on there awhile.
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Thread Starter
Instructor
Joined: Oct 2008
Posts: 219
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From: mississauga ontario
I was super careful when taking off the wires I would trun and pull so they all came Off in one piece. The ground on the back of the block is on. I think the Plugs must get damaged when your trying to muscle in the headers and they have to be super brittle from all the heat cycles
Le Mans Master
Joined: May 2007
Posts: 5,393
Likes: 17
From: Belleville Mich.
Racer
Joined: Aug 2001
Posts: 310
Likes: 0
From: Tomball Texas
[QUOTE=bumble-z;1578234871]Because a few don't take the TIME/EFFORT to pull the plugs before
doing their install.
For me its not an issue of effort. I think we can all agree that pulling the plugs once the manifolds are off is cake. I would rather replace them once the headers are on to make sure nothing enters a cylinder while wrestling the headers in place. If I had someone helping on the install I might change the procedure up.
doing their install.
For me its not an issue of effort. I think we can all agree that pulling the plugs once the manifolds are off is cake. I would rather replace them once the headers are on to make sure nothing enters a cylinder while wrestling the headers in place. If I had someone helping on the install I might change the procedure up.
Le Mans Master
Joined: May 2007
Posts: 5,393
Likes: 17
From: Belleville Mich.
[QUOTE=SLVRCPE;1578235455]
What's wrong with removing them BEFORE removing the stock manifolds?? If not time & effort?
Push paper towel into each plug cyl after removing ea plug. can't get any more straight forward than that.
By the way, I installed my long tubes by myself, on jack stands with out the aid of another set of hands.
Main thing is do the research & have a plan to do the job properly. Less hassle that way.
Because a few don't take the TIME/EFFORT to pull the plugs before
doing their install.
For me its not an issue of effort. I think we can all agree that pulling the plugs once the manifolds are off is cake. I would rather replace them once the headers are on to make sure nothing enters a cylinder while wrestling the headers in place. If I had someone helping on the install I might change the procedure up.
doing their install.
For me its not an issue of effort. I think we can all agree that pulling the plugs once the manifolds are off is cake. I would rather replace them once the headers are on to make sure nothing enters a cylinder while wrestling the headers in place. If I had someone helping on the install I might change the procedure up.
Push paper towel into each plug cyl after removing ea plug. can't get any more straight forward than that.
By the way, I installed my long tubes by myself, on jack stands with out the aid of another set of hands.
Main thing is do the research & have a plan to do the job properly. Less hassle that way.
Last edited by bumble-z; Jul 26, 2011 at 11:11 AM.
Racer
Joined: Aug 2001
Posts: 310
Likes: 0
From: Tomball Texas
[QUOTE=bumble-z;1578235601]
What's wrong with removing them BEFORE removing the stock manifolds?? If not time & effort?
Push paper towel into each plug cyl after removing ea plug. can't get any more straight forward than that.
By the way, I installed my long tubes by myself, on jack stands with out the aid of another set of hands.
Main thing is do the research & have a plan to do the job properly. Less hassle that way.
I must admit you have the very best method of installing headers, congrats!
OP - let us know how that beast runs with the new headers!
What's wrong with removing them BEFORE removing the stock manifolds?? If not time & effort?
Push paper towel into each plug cyl after removing ea plug. can't get any more straight forward than that.
By the way, I installed my long tubes by myself, on jack stands with out the aid of another set of hands.
Main thing is do the research & have a plan to do the job properly. Less hassle that way.
OP - let us know how that beast runs with the new headers!
Last edited by SLVRCPE; Jul 26, 2011 at 11:19 AM.
