Just found out from an emmission test that my car is running a bit too thin.... also when I accelerate it shakes alot and feels like it's gonna stall. Is this also due to too little gas in the mix?
How do I correct this?
Pics would be good :hail:

 

If you are referring too thin as to running lean.?
I would have your fuel pump tested for lack of pressure and if its bad replace it.

 

Yes that's what I mean, too lean.
But a friend told me that you can adjust the mix somehow....???

 

Get an adjustable Fuel Pressure Regulator and increase your fuel pressure. That will richen the mixture.

 

How do you fail from running too lean?

 

Too lean increases hydrocarbon emissions.

 

You mean CO right. And NOx.

 

either way to little is failing and to much is failing, kind of funny

 

Yeah, that's right. HC is a by-product of unburned fuel (too rich)
Co is a by-product of not-completely burned fuel (too lean or misfire)
NOx comes from too hot combustion temps, which is why we have EGR valves, to introduce a small amount of exhaust back into the intake stream, and cool the combustion temperature enough to reduce NOx.

 

From idiot to expert in just one post.

First it was:


Then:

 

The first one was misprinted, I meant Carbon Monoxide, that's why I went back and explained it more thoroughly.....


I see how it's going to be around here!

 

Yes, it's like that because when you post important info, it has to be right so those coming after don't screw somthing up.

HC - Hydrocarbons, unburnt fuel. This is a sign of incomplte combustion, excessivly rich condition or a dead cylinder or two, bad pcv, too hot a plug, bad air filter, etc.

CO - Carbon Monoxide, typically an indicator of a slightly to excessive rich condition (not enough O2 to combine), can be due to high fp, bad air filter, too cold a plug, advanced timing, etc.

NOx - Oxides of Nitrogen, excessive combustion temps, typically a function of power.

CO2, H2O, O2, N2 etc, other gases from typical combustion and emissions components.

 

I thought of another thing...

You might want to replace your fuel filter as well if fuel for some reason is having a hard time flowing through this could be a culprit as well..

 

never heard of too little and you fail

I would think the less HC or NOx would be better being it means less harmfull stuff being put into the atmosphere

 

I agree 100%! Sometimes I forget that there are newcomers who need as much info as possible to help them out. I won't make the same mistake again. I've been wrenching for 23 years, and sometimes, the basics slip my mind. I'll edit more carefully. I still don't think flaming was necessary.

I realized that I switched HC and CO, and tried to correct that as quickly as possible, to not mislead anyone. It wasn't as thorough as your post, but to the point of being correct.


Also, I like your sig, especially "quemadmodum gladius neminem occidit, occidentis telum est." [a sword never kills anybody, it's a tool in the killer's hand.]
(from Lucius Annaeus Seneca, "the Younger," circa 4 BC-65 AD)

 

Yea, we have gotten a bit paranoid about the misinformation. Waayy too many members on here now to keep 'debating' the answers. Ususally you don't get the torch that quick either.


Rx, I think he meant too lean and you fail too rich and you fail. My guess.

 

Check your fuel injectors, it sounds like they may be dirty and flowing poorly. Since you said the car shakes, this leads me to believe that you have a few faulty fuel injectors. Either go the cheap route and pour some fuel injector cleaner in your gas tank (I like STP's the best), or take your injectors out and have them professionally cleaned.

Of course, changing the fuel filter would always help. I'm going to do mine in the next few days, probably Sunday.

 

Representing Schaumptom yo, how's Bloomingdale

 

A lean misfire will indeed create more hyrdocarbons ... Doesnt matter if more or less but lean enough to start missing and incomplete combustion is incomplete combustion :-)

Duron and Roc, u guys ever hang out on the NW IN/South Chicago board? We got quite a few folks from out your way, should head to one of our get togethers

later
JEremy

 

Phatkat64-don't let e'm bother you...most members on this forum are kids between 16-20 years old...calling someone an idiot on an honest mistake reflects that...take in mind the maturity level your dealing with,coupled with the fact that most of them will never get out if the 15's/14's anyway,and stupid responses like that are actually pretty funny...

 

Good F&%$#*ing grief! That's what I meant in the first place! The fact that I corrected myself because I felt I was cornered, communicated something too clearly - I'm trying too hard to fit in here!!!!! I gotta watch that.

I may not have too many posts here, but I've been wrenching and tuning these cars since they were new! I may be a little weak in the computer tuning side, but I well know the mechanical and the seat-of-the-pants tuning side of it, AND I was a state inspector(emissions-spelled with 1 'M' guys)

I'm not referring to any large number of people here. Just a select few. Some of us are here to exchange ideas and info. I thought that's what a forum was for. I'm like just about everyone else, some poor slob trying to get ideas for his/her ride!

 

Don't worry, I don't sweat punks. They're everywhere in the world. Being an old school guy, I live by a simple mantra:
WHEN THE GREEN FLAG DROPS, THE BULLSH!T STOPS!

It's shut people up for years!

 

I take it some of the back-talking is aimed at me over the "idiot to genius" thing I posted. A bad info post, followed by an "oh yeah that's what I meant" post, looks lame. And that last "no wait a minute, that's really what I meant" also sounds lame. Either you know what you're talking about and can support it, or you don't and you can't.

As for my age, I got my OMC tech certification in 1986 and my bachelor's degree in 1991. Not quite old school, but I'm willing to bet that I don't know a lot less than most people here don't know.

And as for the other guy's assertion that a lean misfire can result in more HC in the exhaust stream...let's see a credible reference on that one, or it goes in the BS bin.

 

Well, I guess I found the one bad apple in this group.

BYE

 

Hmmm would you mean the Mid-West board, or is this a separate forum you're talking about all completely? PM me with some more information on it, I'm always up for a get together if I have the time.

Also, c'mon guys this isn't worth arguing about. Who cares what he meant to say. He corrected himself, and I believe him. But even if he didn't know and corrected it just because you said something...so what! In either case, its the same outcome and has nothing to do with you personally.

 

Keep posting wrong info, and you'll find I'm not the only person that will point it out.

It's good to know that if my valvestem seals leak, all I have to do is let it sit overnight and all the oil will seep past my rings so it won't smoke in the morning...

 

Ah.. nevermind.

 

One more thing, a bad temp sensor could create either a too rich/too lean condition as well....