I have a 1995 Nissan maxima that runs perfect. It has 192,000 miles and a great pickup. I have been using royal purple oil regularly from last eight years every 3000k. I maintained it pretty good. From the last couple of years, I started with a couple of problems.
1- Engine light occasionally comes on while driving. The light comes on more frequently during hot weather. I took it to the different shops, and they told me about 3 different codes.
• Knock sensor
• Temperature/Coolant sensor
• O2 sensor
So, I replaced all of them. However, the most frustrating part is even after replacing all the sensor, two days later light came back on again, and I was told the same thing means the same codes.
I need help.
2- The most serious problem and that is driving me crazy. I took the car to various shops and explain them the problem, but they could help me because it does not happen all the time.
90% of the time the car starts good in the morning. I go to the office with no problem. I park my car in the opened parking lot under the sun.
During my lunch break if I go out, 90% of the time, it will start okay, but if I drive 5 to 10 miles and park, and when I come back it would not start.
The only way it starts, if I take a very long ignition self (at least a minute without any interruption) while pressing the gas paddle, it will start, first with the coughing and a minute later it will run okay.
I used to have this problem this occasionally now every other day.
I cannot let my wife drive the car with my children, because I know she will not be able to start the car.
Please help

 

When you replaced the coolant sensor, was it an OEM sensor? Also, as for your warm starts, I would say you need a tune up. If that doesn't make a difference, replace Fuel Pressure Regulator (FPR).

 

^^Agreed with FPR. Does it do it in the morning after it has set all night long? If you cut the car and immediately turn it back on..will it start right up?

 

If you replace the FPR get new screws, and be aware that the after market FPR is different then stock in how the nipple comes out.

 

Occasionally (once a month) I encounter the same problem in the morning. Mostly, during the daytime-- I have replaced Coolant Temperature Sensor by Standard Coolant Temp. They charged me $90 (including the labor) . Knock sensor costed me quite a bit.
Since I am naive and don't know anything about cars. It is very easy to rip me off.
However, this "starting" problem driving me crazy.

Does it cost lots of money to replace Fuel Pressure Regulator (FPR)?

 

I bet you got charged like $600 to change the KS right? Did you know if takes like 20 minutes and can be had for less than $50

 

Yes they charged me around $560 plus

 

*** raped. maxima.org "search" is great!

 

for a knock sensor son??? holy crap you got rooked man!!! i'd ***** slap the a$$hole that tried to charge me that much for that little job, jesus.....

 

i'd suggest looking for a local org member to try and help you out with these simple problems that all our maximas encounter with age. i know i would help if you were close to me. post up the city/state you live in and go from there.

 

<------- Put up your location and ask for local help next time.