Well I checked all my plugs last night after I had been spraying it. All of them looked great but one. They were all a soft nice brown color but one of them had an obvious white rainbow spot on it. The spot was on the back of the ground strap right at where it bends.

I dont know what was happening in this cylinder but it wasnt doing as well as all the other plugs. What could be the problem? I was running 93 octane with Lucas octane booster in it. Usually it takes the nitrous without a problem. It seemed to run great when I was spraying it with no pinging....

What could it be?

 

that plug is alot hotter then the others then. More then likly not enough fuel getting into the cylinder.

 

So you think I should clean that injector or replace it? I dont know why that cylinder would be getting so hot....

I am thinking about getting the new Aeromotive fuel rail kit. Its 189.99 I think. Maybe a good idea.....

 

No doubt you have a lean spike upon N2O activation. This is why a good tune is so important. A good tuner can get the spike under control and possibly save your motor. Are you pulling fuel from the fuel rail? Also a larger rail won't help much since this is a pressure problem, not a volumn problem.

Jay

 

This is why you should get a safe kit such as the venom..... ha ha jk

 

There is no "safe" kit....only lucky owners



Jay

 

You could say that but, there are some crappy kits out there as well as some very well made kits, so one could say one is safer than the other.. right

 

Agree, but with any kit you should at least have the A/F checked ...it may save your motor

Jay

 

Maybe vac. leak there. Maybe intake??

 

Hold the phone guys, let's not get carried away....

1 - Are you running dry or wet? Are your injecting into the intake before the TB, or direct port?

2 - Was it just a small little spot, or was it a lot different?

3 - Which cyclinder? Some are more prone to not getting enough fuel depending on your nitrous setup.

Thing to keep in mind is a good tune is not gonna fix a plugged injector so please don't tell the guy this. The tune is merely reading the a/f coming out of the tail pipe which is merely an average of the a/f in all the combustion chambers. A plugged injector is just well a plugged injector.

You have some options, some easy and some not so easy. First, you could number and pull all the injectors and have them sent out to be profiled and cleaned. They will tell you if there are any problems.

You could simply replace the troubled injector.

You could replace the troubled spark plug and try spraying again and pull it out again.

You could have all your injectors cleaned by using a service such as those offered by automotive shops.

 

So the lean spike is a fuel pressure problem? if so then the fuel switch should cut off nitrous at ANY drop of fuel pressure below 35psi. It hasnt been cutting it off upon nitrous activation. If this was the case then wouldnt more than 1 cylinder be affected? I dont see why I would have a very bad lean spike because the fuel line from the fuel rail to the fuel solenoid is only like 6 inches long..... I have heard that the inital lean spike from nitrous is nothing to worry about because it is only for a split second. But either way a white spot definately means a lean mixture I agree with that. I have the bigger fuel pump and since all the other plugs look perfect I am confused as to what is causing this.

I have been having problems with oil spitting out from the drivers side valve cover at the breather hose connection. Not much oil though, I may have fixed the problem now.

A vaccum problem doesnt seem like the problem because I have the intake properly connected and all the vaccum hoses are connected.....

Maybe i should just get the darn thing tuned already...

 

He has a NX Plate Kit...do you have any experiance with one? You are just throwing out ideas that could cost this guy a motor. There is NO sibstitite for a good tune.. I run an NX kit and have experiance with the plate as well as the Shark Nozzle so please quit the BS:censored:


Jay

 

The lean spike is inherant to all nitrous systems because the fuel loop cannot react fast enough to the demand. Some are worse than others.....the NX Plate is one of the worse.
All these questions is why you need to get the car on a dyno with a competant tuner with experiance with late model nitrous cars. We can guess all we want but that's not going to save your motor.


Jay

 

It was a relatively small spot but it was very obvious. I mean all the rest of the plugs looked ABSOLUTELY perfectly brown but this one has a WHITE rainbow spot surrounded by brown. Just like if I were to drop a spot of white paint on the back of the ground strap. It also was rainbow looking.

I may just replace that injector and try spraying it again. Would a problem like this be something that could possibly hurt the motor right now?

 

There is nothing wrong with your injector, but if you keep on you'll be looking for a new shortblock. :wallbash:


Jay

 

Explain to me how a tune can fix a lean problem in one cyclinder, then I will eat my words. A tuner only reads what comes out the tail pipe. If the whole shooting match is lean, then so be it.

 

Thats what I cant figure out because the other cylinders are doing GREAT.

 

I have seen the plugs before when I was definately running a lean A/F ratio and they were ALL white looking. I do need a tune though just for my peace of mind. Plus my local tuner says he can squeeze up to like 30hp more on the spray....

 

It's obvious you don't understand the lean spike. A couple of years ago I didn't either. I made it a point to learn about it after getting a kit 2 years ago. I finally found a good tuner and have been sucessful in running a 150 shot for quite a while now





Jay

 

The reason its getting lean in one spot rather then th eothers is because its not a direct port kit so its not going to be totaly even distrobution to each cyclinder. Some get more fule less nitrous some get more nitrous less fuel. ONly a direct port kit will be totaly the same (well pretty close to it) in each cyclinder.

 

Well the reason I dont have a tune is becasue I dont have $600-700 for a custom dyno tune w/flip chip. Is there an easier fix that will allow me to fix the A/F ratio while on the spray and not have to spend a small fortune????

 

get a wide-ban a/f guage and wacth it if its lean just up fuel jet sizes till its under control. thats the cheap way.

 

That will not help a lean spike


Jay

 

nothing is going to help the lean spike other then running a dedicated fuel system for the nitrous. He wanted a cheap way and thats about as cheap as you are gonna do it. PLus you are assuming thats from the lean spike you dont know it is. Could it be? of course there is a great chance it is. But it could just be the motor is running lean on the bottle.

 

A good tuner can get the lean spike under control, I've seen it on my car and several others. But yes, we all are assuming ...so I think we all agree this car needs to be on a dyno and have the A/F checked before it's too late


Jay

 

yeah it deffinatly needs to be.

 

It will be on the dyno soon. I just have to come up with the $125.00 for 3 pulls with a wideband.....:bash: This weekend Ill be making some money so maybe next week. Then well know the truth!

 

Does that include tuning? If not that's a lot of $ just to check the A/F. Shoot me a PM and I'll see what my tuner can do for ya


Jay

 

damn at FFW here VMPtuning was doing 40bucks for 2 pulls with a/f also. you cna get way better deals then that. I wouldnt pay more then 80bucks max for that.

 

Yea Delk charges $90 for 3 pulls straight up. Then they charge $25 to hook a wideband up to it and check the A/F ratio..... I havent seen other prices but I thought that 90 bucks was kinda high for what you are getting.