Sup guys. I notice about 2 months back my car feels kinda jerky like its misfiring or Air/Fuel is not right. The idle is not rough but its enough to annoy me. I thought I had the Ignition coils going bad. So 2 days ago I took the car to the dealer for the Ignition Coil TSB. The dealer put my car on the Computer and said there were no Error codes. no Knock, no Misfires. I've never had my Check engine light turn on before.

The Dealer did say "did you know 2 of your cats are Missing" I was like You sure man .. He gave me 2 Readings that Stock cars have that My car didn't have.

He said At IDLE some A/F reading should be at 90 Mine is at 96 ...
At WOT The Stock Reading is 110, Mine is at 130 .. You think these readings are off because of my Y-Pipe??

In the end the dealer said it might be my MAF going bad based on those readings.

What you guys think?

 

do you have a fed spec or cali spec? so u removed the pre-cat and main cat? one of your O2 sensors has to be after a cat. I am not sure if that causes the problem.

I was running a super lean A/F, 18:1 . My check engine light was never turned on.

 

The y-pipe will not affect A/F ratios. The location of the stock O2 sensors that monitor and control A/F ratio have not been altered. Maybe it's time to replace those O2 sensors... the y-pipe is not at fault.

 

Agreed. I've never heard of a Y-pipe affecting A/F ratios.

 

My car is Fed Spec. Only the 2 Precats are removed. THe main Cat is still on the car. I'm wondering what Numbers this guy is reading that my car is Of on. WHat is suppose to be at 90 Idle that My car is reading at 96 and What is suppose to be at 110 WOT that my car is at 130. Maybe its some Gases he is looking at. Maybe b/c my Pre Cats are not there the carbon or whatever Emission # they are suppose to be are Higher.

I didn't wanna go into Details with the dealer b/c the service man was an A$$hole. He said this car highly modified and this and that, and its not under warrenty, You Pay $315 for New MAF. I told him I ain't paying you Jack. I had that Nissan Car Care Clinic thing that came in the mail. This fool expected me to pay him $78 for Diags. When I gave him that Paper that came in the mail, He had a fit b/c not only I wasn't gonna pay him for a New MAF, he wasn't gonna get paid for the Diags fee.

I think My car just needs some plugs .. My car has been like this for over 2 1/2 years now. and Now that I don't drive it that much. Another thing. The little **** issues go away after about 10-15 minute of driving.. the Idle is smooth everything is smooth.

 

Correction, my car has had these same Mods for over 2 1/2 years, but this issue just started 2months ago or so. Its not realy getting better or worse, just stays that way. No Check Engine Light, no Errors on computer Nothing. You think my MAF could do this??

 

have you pulled out the plug and check the gap and condition? just try to front 3 plugs and see how they look. For the rear plug, start with cylinder 5, the last one on the rail.

misfiring can be caused by incorrect gapping of the plugs.




bad MAF will not let you rev over 2500rpm. and a new MAF sensor is 65 dollars. your dealer tried to get you the entire MAF tube? I doubt it is the MAF though.

 

yeah man that fool said replace the whole MAF Tubing and all. I'm thinking the MAF is not the problem. But since the Numbers the computer read were incorrect, he thinks its the MAF causing that to happen, when it could be the Y-Pipe

 

I bet replacing both the coils and plugs will solve all your problems... definitely look into changing plugs if you haven't done so yet...

 

so if you spent 350 and it didnt fix the problem....I bet he will say that he thinks the problem is the y-pipe.



have you check your plugs mine was snow white when I was running really lean. After 43000 miles of use and abuse, the gap became .38 instead .42.

 

The guy said the Coils are Ok, NO errors on computer.

 

No If it didn't fix the problem, the guy would say "Well Its Modified", Out oF warrenty

 

that doesn't mean anything... you will only get a code if the coils all out fail. Mine were bad and I found out because when I dyno'd my numbers were really low and the plot was jagged... I swapped out the coils and that fixed things up....

 

How much are the coils and where are they located under the hood.

 

right above your plugs.

http://www.nissanx.net/tanman/


6 coils will cost you 300 dollars+