Am I running lean after New K&N CAI install?
05-28-2012, 08:07 PM
#1
Thread Starter
Join Date: Apr 2011
Location: WV
Posts: 12
Am I running lean after New K&N CAI install?
I recently purchased a K&N CAI and a tuner and since I have installed the intake and uploaded the 87/89 street tune, my car has been acting really off. The first thing I noticed is that now when I'm cruising on the highway and in 5th gear, if i let off the gas and let it coast it will start to jerk. I also noticed that if I engage the clutch and coast to a stop right out of 5th gear, the RPMs drop really low and then the needle will kind of waver between 400 - 1000 RPMs for a little while before coming back to the normal 800 RPM line it usually stays at when stopped. One time the RPMs actually dropped low enough to stall out the car. Does anyone know if this means I am running lean? If so how can I correct this? I have the K&N filter in the specifications I sent for my tune so I thought they would have corrected this with the tune but that doesn't seem to be the case...
05-29-2012, 05:48 PM
#3
1st Gear Member
Join Date: Apr 2012
Location: CA
Posts: 77
i have this same problem i ended up shorting out my mustang and i brought it to ford dealer they put it all back together and fixed the wiring, i still get the odd jerk whenever i let off the gas in ANY gear and i get a smell when i first start the car up, not a k&n cold air intake its a cheap ebay one. Meh dont really care sounds great
06-04-2012, 08:03 PM
#5
check the plastic inlet tube for cracks.
your IAC may also be showing its age and not working correctly with the new parts.
Return to stock and try to replicate the problem.
If no then put the CAI back on and try again.
If no then put the tune back in and see if it does it again.
If no then you missed something the first time and putting the CAI back on you managed to fix what you missed.
If the problem still happens without the tune then you will want to look at the IAC.
If the problem only happens after the tune then you will want to contact the tuner.
Also its a great idea to clean your engine up a bit with some seafoam if you have not done it yet.
your IAC may also be showing its age and not working correctly with the new parts.
Return to stock and try to replicate the problem.
If no then put the CAI back on and try again.
If no then put the tune back in and see if it does it again.
If no then you missed something the first time and putting the CAI back on you managed to fix what you missed.
If the problem still happens without the tune then you will want to look at the IAC.
If the problem only happens after the tune then you will want to contact the tuner.
Also its a great idea to clean your engine up a bit with some seafoam if you have not done it yet.
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