LS1 Misfiring after installing extractors

[hfcmad]

I got a set of extractors installed & now the car is misfiring under load

If I drive it around normally I have no issue but when I put my foot down to pass a slower car it's starts spluttering & I lose power and it's starts backfiring until I back off of the throttle

Mafless tune was done with standard headers attached


My car

VT SS II
Mafless Tune
OTR
2.5" Cat Back
Standard Cats
2.5" Tri Y's


I had no problems until I got the extractors installed



Please Help

[stockyvrcalais]

check all your leads are on properly, they could of been moved around with the fitment of the extractors

[boby]

misfiring or backfiring???
perhaps check your
your oxygen sensor, might be playing up or not installed properly, or your spark lug lead/spark plug has been damaged

[nick_]

It will most likely be the spark plugs and/or leads.. I'm guessing a lead may have gotten damaged..

[rb26dett]

New extractors fitted I would suggest it is the O2 sensors

[VY ACCLAIM WAGZ]

I've just gone through the same issue ,checked plugs and leads and they were fine ,removed and cleaned 02 sensors ran fine for a couple of days tryed cleaning the sensor again didn't work
so have just put in New sensors and is running Beautiffly .so i would have to say its the o2 sensors .Good Luck

[vxcalais_01]

Sometimes the porcelain on the plugs can be cracked. Pull them out and check them. After 7 years without, i put on extractors and my original oxys are still used. They sometimes get stuck and can get damaged when pulling them out.

[Not_An_Abba_Fan]

I would check the plugs too, I have seen a few get cracked removing and replacing them when fitting extractors. Leads can sometimes pull away from the connector when removed from the plugs too, so that could be your problem. Check them with a multi meter, the one that has zero resistance will be the culprit. The spark will jump fine while there is no load on the engine, but once it loads up then it will misfire.

[hfcmad]

I changed the plugs today, But still have the same problem,

So I removed all of the leads & reconnected them & it helped a bit so I'm going to replace them tomorrow

[v8superlegend]

if they are stock leads, i also had the same problem with the old mans car... the electrodes inside get damaged... was like new with a new set of leads...

[hfcmad]

The new set of leads don't have the removable metal sleeve like the factory leads

Do I reuse the metal sleeves or not ????

[dope505069]

yes use the metal sleaves clean them before reusing the are there to protect leads from heat/melting i guess

[davleigh]

just in regards to this. if you have an otr, mafless tune, 2.5in cat back. then you install headers.

do you need to get a new tune? or is it only once you install a cam that the tune needs to be re done?

[Munz]

you can have it retuned but only if they would do it for free - not worth it if you have to pay

[davleigh]

ok. cos i am getting my otr cai and and mafless done tomorrow. i only have a cat back, msd leads and platinum plugs atm but i am looking at going vy hsv headers down the track. just needed to know that lol.
i didnt wanna install the headers and then have to go retune it

[davleigh]

mafless tune done and otr installed.
also now have a full vz clubby exhaust to fit on the car.
do you know what kinda improvements this might give?

[DLFHUB666]

Well the tune an otr should net you 15-25rwkw, The exhaust will get you another 10-15rwkw if re-tuned maybe 5-8rwkw if not. These are just ball park Figures.

You really should have done all the bolt on mods 1st then got the tune done, because to get the most out of the exhaust you will need a re-tune.

Also im fairly sure that the 'headers' on the vz ls1 clubsport are the same cast mainfolds that your vx ss have so no better the vy clubsport had ture headers. so what im saying is you will still need a set of headers. (I could be wrong)