90ED6LSV

so i just assembled a fresh ls/vtec b18a block b18c1 head, has stage 2 cams, valvesprings, arp head studs, etc. i have it basemapped on crome with vtec set at 4500, and when I bring the rpm's up to vtec engagement even partial throttle it will start sputtering or misfiring or something. it will keep revving up slightly after it starts sputtering but it doesn't want to go anywhere really.

vtec wiring should be fine, no CEL's for pressure switch or solenoid, only thing i can really think of is maybe because the headgasket was blown before the rebuild and it mixed coolant with the oil, maybe i need to change the oil a couple times to get all the milky oil out of the engine? I notice with my oil pressure gauge that it has normal oil pressure, but it seems to move oil pressure a lot sooner on warm-up than before I did the head swap. Like the oil is thinner maybe.

i've checked timing is spot-on, no CEl's, speedo and tach are working, oil level is normal (pretty much at the second dot), oil pressures are normal at cruising and wot. oil pan has a slight dent in it but has never affected the oil pressures before. oil pressure does not seem to change when it tries to engage vtec, not sure if it's supposed to though. The engine ran perfectly as a non-vtec LS, almost everything from injectors, fuel system, dizzy was switched over from the perfectly running engine. only thing I haven't checked yet is the spark plugs, they were sitting in this head for awhile.

Any other ideas?

kyden

tune. tune. tune.

hybridmiklo

exactly!! why would a built motor run perfect on a basemap.

90ED6LSV

why wouldn't it?

Fliptard

Because a basemap is only good enough to run your car from your house after build to the tuner. Running on a basemap will only hurt your engine later on down the road.

90ED6LSV

Lol okay, but that doesn't solve the problem I'm having.

But I forgot to.mention that I don't have an oem oil pressure sensor wired in. I replaced it with my oil feed.lines for turbo and vtec, and my oil temp and pres gauges. Maybe this is whats causing it, that the ecu cant read he oil pres?

hybridmiklo

what the heck? what do you mean that doesnt solve your problem!!! It is your freaking problem!! its not tuned, which means you are actually misfiring when vtec engages. The air fuel ratio is so bad that it is detonating. We just told you the problem and due to your lack of experience and knowledge you disregard it. Unbelievable!!!

NZXTInerTia

You're surprised? They should call it Honda-Techless...

hybridmiklo

the ecu doesn't even look at the oil pressure sensor on the back of the block. power goes to it from the fuse box and when there is not enough pressure the sensor or switch as it really is grounds which completes the circuit and oil light comes on. it has nothing to do with the ecu.

Fliptard

your ECU runs your car, if everything isn't perfectly set right, the motor WILL NOT run correctly. Even putting a simple cold air intake on an engine changes the way the motor works (by air/ fuel mixture). Once you change something the computer is not programmed for, you have to get it tuned. It's like plugging a printer, copier, internet into your home computer and not installing (which would be tuning in vehicles) then trying to use it. The computer has no idea what it is, so it isn't going to work, nor work correctly.

90ED6LSV

Lol cool story bro. It is NOT my problem... Just because it makes sense to you doesn't make it the right answer. I'm not a professional tuner or anything but I tuned the car myself when it was non-vtec good enough to trap 105mph in the 1/4 on 7psi and lasted over a year before I tore the head off to put this vtec head on it. And i've been messing with the basemap in it and actually got it to run a hell of a lot better off-vtec but every time I go up to vtec engagement, and no matter whether i am WOT, or barely on the gas, it just sputters. So don't tell me it's the afr making it detonate lmao...

today I changed the spark plugs, changed vtec solenoids, did the pressure switch bypass just in case, drained some oil and put some new oil in it, and I burned several new chips trying to solve the problem and every time it's exactly the same.

I recorded a clip of what it's doing ill try to get it uploaded soon.

90ED6LSV

it seems basically like it's hitting a rev limiter.

http://www.youtube.com/watch?v=CO8Zu...ature=youtu.be

Fliptard

So quit bitching and get it tuned!!!!

When v-tec engages, your fuel maps and AFR change ALOT differently than not having v-tec. If you have the same amount of fuel in v-tec, than out of it, what's the point of it? It'll just run more lean and NOT RUN RIGHT.

PROFECIALLY TUNE IT.

THEN come back and tell us your problems, more than likely, it'll be fixed by then.

90ED6LSV

Well i can see that no help will come from this thread.

Fliptard

We are helping you. We are telling you would needs to be done to take a MAJOR factor out of the equation.

If after it was professionally tuned and it still did it, than there is something else majorly wrong. When you get it tuned, the tuner will deff be able to pin-point the problem and (more than likely) fix it via the tune, or tell you exactly what you need to do to fix it.

hybridmiklo

im done. you dont know what you are doing and so hard headed you dont want to listen. Im an ase certified tech with a smog license and works at a dealership. I know what im telling you but you are too thick to understand. stop asking questions and wasting time of others.

Runnerdown

Typical.

Sounds like you are pretty amateur at understanding how the engine actually works. Btw, what did you use to supply oil for vtec? What size line and how is it run? If you dont have enough oil to engage the vtec pins then you will also have major issues from running too rich. But a generic vtec engagement setpoint of 4500 on a basemap with aftermarket cams is a big no no. Listen to the people giving you advice or GTFO.

90ED6LSV

how is it tuning when it does the same thing on partial throttle? I could understand your opinion if it happened only while wot but I can almost gurantee it's something else going on. I've never had something like this happen to me before while building motors.

I used a standard Earl'sls/vtec oil feed line with a oil filter sandwich plate, I think it's -4an i don't remember the sizing of AN's.


You're all saying that it's the AFR, so I'll put in this aem wideband I have and report back to you what it's doing.

90ED6LSV

how about this, you can paypal me funds for tuning and if it is because of that then i'll refund you the cost and if it's not then I got a free tune, sound good yeah?

90ED6LSV

Well i took apart the head, nothing seems wrong or missing, did the air test in the front of the head and the rocker locks in vtec. Tried a whole new basemap made from a diffefent base code and still does the same exact ****. I've tried a bunch of diffefent fuel settings and it does the same thi mg every time.. Any other suggestions?

also checked the solenoid for power and it works.

slowDB7

so then it is obviously something wrong with the basemap, try contacting xenocron and have them make you a basemap that actually will work till you can get it tuned


also...what ecu are you running?

grumblemarc

iTrader: (4)

The writeup on how to do a proper LS/V states PLAINLY That you will need a TUNE. Not a basemap.

R-Spec Ferio

gotta say tune as well. is it a P28 ECU?

raverx3m

iTrader: (1)

lol tune it bro

why the f you even set your vtec at 4500 with stage 2 cams

it should be closer to 6000 rpm


who made your basemap
do you even have vtec enabled in your basemap?
have you looked over the basemap?
is it running in closed or open loop?
what ecu is it who chipped it?

send us the link for the basemap you using

basemap is ONLY TO DRIVE THE CAR TO DYNO IN LOW RPM not to smash around

and put that damn wideband in before you blow it up

90ED6LSV

Ive been running basemaps in my lsv for as long as i can remember, never has any problems.
I believe i states that i made the basemaps. Yes of course vtec is enabled... Its a p28 ecu that i chipped myself when i was just ls turbo. I never said i was going to be smashing around on the basemap, i can't even hit vtec yet. It does it even just revving the engine. I seriously doubt UT has to with tuning though. Yesterday i started the car and it threw a cyp sensor cel, restarted it and it went away. Might have something to do with it? It just doesn't make sense how am i supposed to time it if vtec doesn't engage right, because it doesn't seem like it would be fixable with just finalizing fuel maps...