lean popping
03-20-2009, 11:14 AM
#1
Registered User
Thread Starter
Join Date: Mar 2009
Location: seguin/tx
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
lean popping i have a g8 gt with jba headers,aFe cold air intake, and a Magnaflow Exhaust Systems... with no dyno.. its popping going up in rpms how bad could that be.
and will a dyno stop it from doing that.
and the engine light is on
and will a dyno stop it from doing that.
and the engine light is on
03-20-2009, 01:15 PM
#4
Check engine light (CEL). From what I've read the exhaust has a tendency to pop if its under 3". Its most likely throwing the code due to O2 sensors. Go to auto zone and get it pulled. In any even you definitely need to get a tune on it since you now have a full exhaust and CAI.
03-20-2009, 01:31 PM
#5
On The Tree
Join Date: Oct 2006
Location: San Antonio
Posts: 187
Likes: 0
Received 0 Likes
on
0 Posts
I just installed a Magnaflow Catback on my car and it is doing the same thing except i do not have an H or X pipe and it seemed to rob a lot of low end torque and HP. Does ok up top but pops a lot after letting off from high rpms? Guy said an H or X pipe would help this. Does that sound right?
Sorry not trying to highjac your thread just a question?
Sorry not trying to highjac your thread just a question?
Trending Topics
03-20-2009, 11:09 PM
#8
No the popping isn't. But you seriously need to get a tune on that thing if you're still on the stock tune w/ full exhaust and CAI. To put it into perspective, people usually tune after CAI and once again after LT's, or after both are installed @ the same time. That's your best bet at this point.
03-23-2009, 12:50 PM
#13
On The Tree
iTrader: (1)
Join Date: Dec 2004
Location: SE Michigan
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Well by saying a dyno, I am guessing you mean a dyno tune....
First, Get CEL code it might just be the rear O2s (which won't affect performance), or there could be multiple codes indicating other issues.
Second, Check for mechanical problems like Vacuum leak, melted plug wires both of which are easy to do with header/air intake installs.
Third, Get a "scan" to see what's happening, are your fuel trims reasonable? Any misfires noted?
I wouldn't go WOT until you get it figured out.
I don't see how an air/fuel ratio problem would cause that--the stock tune can reasonably compensate for headers and an intake.
First, Get CEL code it might just be the rear O2s (which won't affect performance), or there could be multiple codes indicating other issues.
Second, Check for mechanical problems like Vacuum leak, melted plug wires both of which are easy to do with header/air intake installs.
Third, Get a "scan" to see what's happening, are your fuel trims reasonable? Any misfires noted?
I wouldn't go WOT until you get it figured out.
I don't see how an air/fuel ratio problem would cause that--the stock tune can reasonably compensate for headers and an intake.
03-26-2009, 01:01 AM
#15
FWIW, I just had a customer bring me his G8 that was recently built/tuned by another shop, and it was doing this "popping" sound especially during shifts @ WOT. With about 30 minutes of street tuning, I had the popping tuned out of it. This comes from either no tune at all, or just a dyno tune. Dyno tuning G8's aren't going to get what you need done in the PCM to get the full potential out of the car, PERIOD. Timing/air/fuel adjustments need to be done on the road when it's under a full load.
