Car Backfiring/sputtering After Lt Install
Thread Starter
Racer
Joined: Aug 2006
Posts: 404
Likes: 0
From: Napa Ca
Car Backfiring/sputtering After Lt Install
AS THE TITLE SAYS.... THE CHECK ENGINE LIGHT IS ON NOW AND ITS RUNNING LIKE CRAP WHEN I GET ON IT. SO THEREFORE IM DRIVING IT LIKE A BABY RIGHT NOW. WHATS GOING ON WITH MY CAR?
Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Originally Posted by Yellow03Z06
You could have crossed the 02 wires. Check the DIC for codes.
Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
95% of the time it's 02 related after a LT install. The rear 02's are supposed to be relocated to the front positions on your header collectors...and plugged into your FRONT 02 connectors with the use of adapters. Front 02's are supposed to be crossed, rears are NOT. Rear 02's should be turned off with programming or replaced with simms since they won't work well with LT's even if you do have cats.
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
Mine did this same thing until I replaced the front 02's with rear 02's from a 2002 Z06. They have a better warmer or something. Try this, should work. It takes a little wiring switch.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Originally Posted by Billdog350
95% of the time it's 02 related after a LT install. The rear 02's are supposed to be relocated to the front positions on your header collectors...and plugged into your FRONT 02 connectors with the use of adapters. Front 02's are supposed to be crossed, rears are NOT. Rear 02's should be turned off with programming or replaced with simms since they won't work well with LT's even if you do have cats.
Other things to check if the wiring is proven correct. Make sure the wires are not laying on a hot exhaust pipe and melting/shorted. Also, check the spark plug wires are fully on. Ohm the wires to make sure one or more didn't get damaged when pulling off and putting on. If all that proves correct check the spark plugs for cracks in the porcelin.
Drifting
Joined: Nov 2003
Posts: 1,898
Likes: 6
From: Sahuarita AZ
Inspect your plug wires. I just had a similar issue and plug wire on cylinder #4 was the culpret. Looks like the dip stick was pushing the wire onto the header and melting insued.
I even have heat socks on the wires!!
I even have heat socks on the wires!!
Thread Starter
Racer
Joined: Aug 2006
Posts: 404
Likes: 0
From: Napa Ca
I installed the rear 02's in the rear and the front 02's in the front. its like the 02s our on a stock exhaust system how it would come from the factory. nothing is mixed up. i think i just need the rear 02's deleted. cause when the check engine light isnt on the car runs fine. but once its on its backfires like a mother. ill find out sat when i take it for a tune.
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Le Mans Master
Joined: Sep 2003
Posts: 6,276
Likes: 227
From: Farmington CT
Cruise-In VII Veteran
Originally Posted by ArKay99
As I understand it, this should be done when installing LG Pro's. All other headers should use stock placements. For example, I have Kooks and the O2 wiring is stock. I also have stock O2 sensor's in the collector and no issues. Using rear O2's in place of the fronts can help in certain apps and I was even contemplating this for my setup.
Other things to check if the wiring is proven correct. Make sure the wires are not laying on a hot exhaust pipe and melting/shorted. Also, check the spark plug wires are fully on. Ohm the wires to make sure one or more didn't get damaged when pulling off and putting on. If all that proves correct check the spark plugs for cracks in the porcelin.
Other things to check if the wiring is proven correct. Make sure the wires are not laying on a hot exhaust pipe and melting/shorted. Also, check the spark plug wires are fully on. Ohm the wires to make sure one or more didn't get damaged when pulling off and putting on. If all that proves correct check the spark plugs for cracks in the porcelin.
Le Mans Master
Joined: Dec 2003
Posts: 5,561
Likes: 448
From: Atlanta metro Ga.
Originally Posted by blackc598
I installed the rear 02's in the rear and the front 02's in the front. its like the 02s our on a stock exhaust system how it would come from the factory. nothing is mixed up. i think i just need the rear 02's deleted. cause when the check engine light isnt on the car runs fine. but once its on its backfires like a mother. ill find out sat when i take it for a tune.
Le Mans Master
Joined: Oct 2002
Posts: 6,772
Likes: 1
From: Tampa FL
Originally Posted by blackc598
I installed the rear 02's in the rear and the front 02's in the front. its like the 02s our on a stock exhaust system how it would come from the factory. nothing is mixed up. i think i just need the rear 02's deleted. cause when the check engine light isnt on the car runs fine. but once its on its backfires like a mother. ill find out sat when i take it for a tune.
i had the same thing cuz i put in a cracked plug (dur move on my part, i know) ..
Thread Starter
Racer
Joined: Aug 2006
Posts: 404
Likes: 0
From: Napa Ca
I Wonder If Im Having Air Tube Problems ?? Cause These Headers Were From A Specific Year 2002+ So I Had To Do An Air Tube Swap. But Wouldnt I Be Getting Some Kind Of Rough Idle ?? Im Going To Change My Plugs And Then Go Get It Tuned From There Hopefully Its Nothing To Bad!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Naaaa cracked plugs would never be the problem:
When I installed my headers, this cropped up and gave me fits! Mis and backfires were the main symptom.
BC
When I installed my headers, this cropped up and gave me fits! Mis and backfires were the main symptom.
BC
Drifting
Joined: Nov 2003
Posts: 1,898
Likes: 6
From: Sahuarita AZ
Originally Posted by Bill Curlee
Naaaa cracked plugs would never be the problem:
When I installed my headers, this cropped up and gave me fits! Mis and backfires were the main symptom.
BC
When I installed my headers, this cropped up and gave me fits! Mis and backfires were the main symptom.
BC
Always good to check the simple solutions first. If you choose not to, you'll be mad when someone you're paying finds an $8 plug to be the issue but gives you a $200 bill.
Drifting
Joined: Nov 2003
Posts: 1,898
Likes: 6
From: Sahuarita AZ
Like I said, I just went through this issue after having a valve spring break. I was afraid the valve was bent & not sealing but it turned out to be a spark plug wire melted & was arcing to the header. Cheap fixes are the best ones!
Thread Starter
Racer
Joined: Aug 2006
Posts: 404
Likes: 0
From: Napa Ca
so if it is a spark plug or my wires it would throw a check engine light? but the thing is when the check engine light was not on the other day due to the tuner clearing the codes and me seafoaming the car it ran perfectly fine up top. ill change the plugs and check the wires but those are brand new. hopefully my tuner will figure it out.