From the J30 forum. here is a list what I got need to be done. Thanks gerardjg. The post was a few years old and seems to be extensive. I dont
think I can do many of them by myself.

I am seeking advice on what are the essential thinks that need to be done.
I am also trying to figure if it is worth putting the time and effort to do this compared to 5 miles gain per gallon. How long does this last.

Also how good is this BG44k? I read some people in other forums mention this is a scam. Does not really improve the mileage, rather accelerated tranny failure.

The list :

Cleaned Injectors
Cleaned Throttle bodies
Cleaned Intake manifold
Cleaned MAF
Installed recommended plugs
BG44k every 3 thousand miles
Replaced PCV valves and some hoses
Replaced 02 sensors
Run only 93 octane
Cleaned all connectors and grounds that I could get to
Converted all fluids to synthetic
Plus all the routine oil changes and filters.

You might pull the codes from the ECU and see if it isn't throwing a knock sensor code. That WILL NOT make the check engine light come on.
A bad knock sensor will retard the timing causing sluggish performance and lower MPG.

I may sound a bit novice, how do you pull codes from the ECU.
I will try the Redline S1.

Does changing plugs help getting good mileage ?
Would changing the timing belt help gas mileage?
How much to they charge for timing belt change. The mileage is 120k.
The first owner sold at 105k. Did not change the belt. The 2nd owner does not know if it was changed or not. Is there any way to know that?

In June,
Changed all the driving belts.
Did Transmission fluid flush
Cooling system flush
Changed all the filters.

http://www.nicoclub.com/articl...shtml

Plugs made a big difference for me.
Timing belt wont help mileage but if it snaps your engine is GONE.
I did mine myself.
Water pump , Thermostat and belt ran about 130.00
Two days work taking my time.
http://forums.nicoclub.com/zerothread?id=198122

If you're in NY, check this out

1993 Infiniti J30 107,560 Miles

As far as your knock sensor, you can unplug it to make sure it is working. Just disconnect it and drive. You will know within 20 feet if its bad. If it drives the same, it's busted.

Hope this helps.

We're in complete agreement when it comes to observed mileage numbers, and after having recently removed my plenum to clean it, replace all six injectors, do a TB Heating By-Pass, install a new EGR and PCV valves, new plugs, new fuel filter, clean the MAF, EGR tubes and throttle bodies. I also remove my right shoe, chiefly to save wear on the mat, but for comfort too and doing so possibly helps me drive with a softer touch on the gas pedal. I run 34 psi in the tires.

A properly adjusted TPS is very important, as it determines shift points and crusing rpms/OD lock-up, along with influencing the idle speed and engine timing.

Use the cruise control? Crusing at 50-55 mph instead of 65-70 would make a huge difference. The J30 just does 80+ mph so effortlessly and it's sort of fun pulling away from other cars when going up hills, if you aren't watching the fuel gauge noticeably heading toward E at the same time.

Modified by GerryO at 12:54 PM 9/10/2008

Hey now...

I still haven't found anything better than BG44k... When did they change the formula and what is the 'stuff' that they took out?

I'm not arguing I just want to know if my favorite product has been compromised.

I've been recommending BG for years based on my experiences back when I was drag racing and so far the only thing that I've noticed is nothing but improvements.

I'm not talking about gas mileage however..., most of the time that I use it is for when I am working on a car that has a stumble or hesitation issue. It works great on dirty injectors, and still does as far as I'm concerned.

Regardless... What gives?

Is BG compromised and if so what is it that Redline has that BG doesn't anymore?

--Anyone?

--James

Exceeding a steady 61 MPH will cause you to EXCEED EPA TEST STANDARD and consume and waste gasoline.