ccarey

ok everyone I am having some issues here and I am hoping someone can point me in a the right direction. I have an ls vtec boosted setup here are the specs
b18b block-stock crank with block guard
forged rods and pistons
built head-valves, springs, retainers and skunk 2 tuner cams
new hondata s300 management system
RC 1000 injectors
255 fuel pump
AEM wideband
That is just a few of the specs, if you need more info I'll be happy to provide.

Here is my issue, I just had it tuned about 3 weeks ago and day 3 after the tune I was driving in normal conditions and all of a sudden the AF gauge went up to 16 then 17 then 18 then ---. I couldn't get it back down no matter how I drove it. I had the vehicle towed to a friends who changed a few settings on the fuel side under part throttle and boost. He drove it a good 10 to 12 miles and all was fine, so I came and got the car. I drove it home which is a good 25 to 30 miles and it was 12.0 all the way. I got home cut the car off and 30 minutes later went back out to crank it up and it stumbled a bit and was right back at 16 then 17 then --- just at idle. I have not driven the car since I drove it home yesterday. I cranked it 20 minutes ago today and it started off at 14.8 at idle then went up to 17, so I hit the throttle lightly to see what would happen and after I let off it went down to 12.0 and stayed there until it gets up to temp of about 190 then it goes right back lean again. Everything on this build is new with the exception of the dizzy and some of the sensors of course so I was hoping someone could help point me in a good direction. I don't want to and cant afford to at the moment start throwing more money in this car. If it has to sit then it will, I won't drive it lean but I do want to fix it. Any suggestions as to what might be happening?

siregcivic

what is your fuel pressure, how is your fuel system? fuel pressure regulator fuel filter fuel pump..

my car did the same thing the other day but im on neptune all motor h swap eg, was driving and came to a stop to get off freeway and it just started running really lean 18afr at idle but when i hit the gas it richened up so i limped it home check my settings and everything is fine...

it hasent done it since but im guessing my 20 year old fuel pump is going bad lol

siregcivic

also how is your settings for iat ect enrichment?

ccarey

my fuel pressure at idle is 40 psi, and my settings for my iat I am not sure. I need to download my tune but I don't have a working computer at the moment to do so. I m on my ipad currently. My fuel system should be ok. The car sat for several years so we drained all the gas out before we tuned it and put fresh fuel in prior to the tune which all went well. Fuel filter idk the condition of to be honest. everything is AEM as far as fuel products. fuel rail is golden eagle with rc 1000 injectors

ccarey

the car runs fine it seems like until I put some driving on it at 70 mph for a length of time then it starts to act up. It stays lean for whatever reason then decides it wants to run fine for just a brief moment then right back lean after driving a while
These are the items I looked into replacing
1. resistor box
2. dizzy completely
3. IAC valve
but dang if those are not some expensive items

ccarey

Also does hondata make a software program that is compatable with mac to where I can download my tune, I didn't think they did but hoping someone can clarify

13g-crx

How do you know its not just the o2 sensor going bad?

ccarey

I just bought a brand new AEM wideband the day before it was tuned. A secondary oem o2 sensor isn't even hooked up nor is it turned on in the hondata until I get the bung and o2 sensor installed

ccarey

Anyone?

ccarey

So nobody has had an issue with their boosted setup running lean ?

ccarey

I tried another coolant temperature switch and no change. Tried a new coil in the dizzy and no change. I will bleed the cooling system next and go from there. Anyone suggest anything else ?

sp00led

They don't but you can download a trial copy of VMWare and install windows on your mac. You can also use bootcamp to install a windows partition that you can option boot when you turn the machine on.

95dc2teg

Does the car actually run differently? Or does the wideband just read lean? It could just be that your wideband o2 sensor is takings a ****.

mitsuman

iTrader: (1)

x2, before doing anything you need to verify that the readings are accurate. otherwise you will never know if the changes you make are having a true effect.

change out the o2 sensor and see what happens.

Spawne32

iTrader: (3)

the car wont move under its own power in the 17's and 18's for an AFR, sounds like its just your o2 sensor taking a ****

boosted_lsv

i just recently had the same issue. mine would occur after driving and killing it for a few minutes and starting it back up, it was the compensation on the iat just go and set the compensation to 0.0 on the temps and if it doesnt completely fix your problem then add positive value to it until all is good at higher temps, be sure to only change the negative values and leave positive alone

ccarey

Surely my brand new aem wideband wouldn't be bad with less than 100 miles on it.

ccarey

The o2 feature for a secondary o2 isn't turned on in my s300 because I'm not running one just the wideband.

ccarey

And yes the car runs pretty much the same. You can feel a slight miss when the A/F gauge reads higher but I didn't drive but a mile when that happened just to get the car home. Other than that I don't drive it and allow it to get that high.

DDTECH

Who tuned the car..then i would ask, why you haven't you taken it back to them.

ccarey

trackmasters in huntsville AL is who tuned it. I haven't taken it back because it would cost me 200 to have it towed and right now money is a bit tight with kids and birthdays and holidays so I was trying to see if my issue was something I could fix before I go dropping 200 on a tow bill. Also, I already contacted the tuner and I am in the process of trying to borrow a laptop so I can datalog it and send it to him. Since hondata isn't compatable with my mac I'm kind of in a bind. I've already tried some of the alternate options described above to get it to work on my mac but so far it's a no go

ccarey

did a datalog for 20 minutes last night and sent it to the tuner so hopefully he will spot something. If anyone has any further ideas or suggestions please let me know. I have been looking into and checking what has been suggested so far but everything appears to be normal and operating properly and getting correct voltage so I am at a loss unless it's in my tune

BigZeke5

I work at a dealer. Parts do go bad at times. I have seen defective parts coming out of the box as well as cars coming back 2 or 3 days later because a part fails (electrical) You never know that o2 sensor might be bad.

DDTECH

If things dont end up getting fixed, I do alot of traveling(2-3 times a month) to gulfport/biloxi to tune cars.. I'm setting up another drive down for a weekend in a few weeks, i have a couple of cars lined up, if you want, while i'm down you can drive it to me, to look at it, i'll be happy to help you out, for a price. PM me if this doesn't get resolved.

ccarey

Well at this point if my tuner can't find any issues in the tune I may need to take you up on the offer because I am very frustrated with the car at this point