A strange Lunge

[Ames63]

Recently purchased a 1996 I30, the car drove fine except that it will occasionally lunge while at cruise speed (I do not have cruise control engaged). Does anyone have any experience with this problem or can explain to me what's going on ?

I have not read codes yet I do know that the check engine light is on.

[loystock]

Welcome to NICO.

The lunge could be due to change in fuel delivery, misfire, etc. Get a free scan from Autozone first, have a printout of the fault code and we can go from there.

[NutriaforBreakfast]

Check CV axles and boots for cracking and leaking grease

[Ames63]

We scanned for codes today and had two:

1. P0100 (MAF or VAF)

2. P0325 (Knock Sensor Bank 1 or Sensor 1)

Is it a simple process to just change these two sensors? And is there an online guide for the do it yourselfer?

Lastly we did inspect the CV axle and boots they look fine.

[NutriaforBreakfast]

The codes help a lot.

Are you running super unleaded fuel? If not, that could bethe reason the PO325 code flashed.

[loystock]

Replace the MAF sensor first and see if the KS code goes away. Remember, the KS will only trigger a fault code but don't turn on the CEL. So when the ECU and CEL have been cleared when the MAF sensor was replaced, have an OBD scan and see if you still have the KS fault code.

You have a choice of buying refurbished MAF sensor from Napa for @ $200+ (you have to surrender the old MAF sensor) or buy new at discounted price from Ios - infinitipartsUSA.com for @ $450.

If the KS problem persists, look for the FAQ 'sticky' in this forum on how to replace it. Also, you can refer to the YouTube video of a KS replacement on a Maxima 4th Gen (same engine as I30). The 2 videos are courtesy of "boredmder."

http://www.youtube.com/watch?v=R2ntaxi7bXk

http://www.youtube.com/watch?v=fPIMOIwLISc