Boosted LS: Misfire problem???

[RonJ]

Well im not sure if its missing or not!? Its running like i have a spark plug unhooked or i have a wicked vacumm leak. Why would i never get a cel??

So no problems while driving the car aside from idle problems when stopped, right?

Vacuum/intake air leak and low idle do not go together, whereas vacuum/intake air leak and high idle do.

If you only have a low idle problem, then clean the IACV and adjust the idle screw on the throttle body.

 

[EG-HATCHIE]

ok whats the iacv tho

 

[RonJ]

Idle air control valve = IACV

It allows the ECU to control idle speed.

 

[RonJ]

 

[EG-HATCHIE]

Ok idle air control valve I have veard of this being a problem on b18's. Ill try that now thanks

 

[EG-HATCHIE]

So i just did that... it was gummy and dirty as hell but didnt seem to change anything. Idk but when i let it try to idle its only reading between -8 to -5 vac? Its supp to have -15

 

[RonJ]

Reset the ECU and then also try adjusting the idle speed.

 

[EG-HATCHIE]

tried those both. could it just be that rich untuned? my other cars i turbod ran really good untuned.

 

[RonJ]

Running rich won't cause a low idle. The engine isn't getting enough air. Is the PCV hose plugged? Or does the PCV have to be disconnected for turbo?

What happens to the idle speed if you unplug the IACV? Did you try setting the idle speed exactly as described in the diagram?

 

[EG-HATCHIE]

I have the pcv unplugged right now I was wondering if i should plug it. Its not getting enough air with the turbo, I wonder if the air/fuel ratios are really that far off with no tune. Does anyone know what to do with the PCV?? pleaselet me kno

 

[EG-HATCHIE]

the car wont idle without me holding the gas a bit, so if i try to set the idle it dies before i can get to it. when i unplug the iacv it changes nothing.

 

[EG-HATCHIE]

ok i checked compression and its all 180 across the borad so idk what to do maybe my head gaskets blown?? Or my distro went bad all of a sudden? ive tried everything i switched ecus same thing
THIS IS CRAZY

 

[EG-HATCHIE]

help

setup- b18b1 in hatch
I was driving the car fine 2 months ago with no turbo, it ran great with no issues. (after that it sat in my garage for 2 months) So I just recently finished my turbo install 16g turbo, rc440, 255 pump blah blah blah Well i go to start it and it runs but its very, very sluggish, it wont idle if i let off the gas and its almost like its running on 3 cyls. Its like the motor is not getting enough air and dies out but theres plenty of gas and spark. Its sounds like a horrible missfire when i keep it idleing. I can't even get a CEL code or anything? So I'm stumped. These are the things I have done.

-empty old gas put brand new 93
-new plugs (.028), wires cap and rotor
-new fuel pump
-switched ecus (for chipped one and stock)
-tested compression 180 on all 4 cyl.
-cleaned my IACV
-ohm tested my injectors
-I want to check timing but it wont run good enough to use a light gun.? also it was running great nonturbo and i never touched dizzy or belt.

After all this nothing has changed?? I think its either a bad distributer, blown head gasket, or could it be running this bad just cause it's not tuned? My other sohc i turbo'd ran great w/o a tune so that can't be it, nothing near this... I want to bring it to my tuner so i can drive it but I need to figure this out first. Anything at this point would help cause I've done everything i can think of. Im going to try taking the turbo off and starting it to see if it runs or if the problem isn't to do with the turbo. Would you have any suggestions on trobleshooting this further?

Thanks, J

 

[Esotericimage]

No need to start another thread with your same issue..

Gap your plugs to 22, Use NGK 4091's
Set your fuel pressure to 50-60psi
Use Super Premium fuel only!
limp your ride to a tuner so he can dial everything in.

 

[RonJ]

No need to start another thread with your same issue..

Threads merged.

 

[EG-HATCHIE]

No need to start another thread with your same issue..

Gap your plugs to 22, Use NGK 4091's
Set your fuel pressure to 50-60psi
Use Super Premium fuel only!
limp your ride to a tuner so he can dial everything in.

dude ill tow it right to the tuner, i just need to fix this problem so i can drive it around my neighborhood to see if the wastegate and bov are working properly... Its to the point to where it wont even start unless I hold the gas a bit?! I let off the gas and it dies instantly. it wont idle and it wont drive right. I have asked plenty of times if my car could run this horrible from the 440 injectors and a 255 walbro fuel pump and never got a straight answer? I kno when you turbo a car its not supposed to BARLEY run, maybe if i had 1000cc injectors I could see that.

Im going to post a video so you guys can see for your self.

 

[Esotericimage]

Sounds like your AFR needs to be worked out by a tuner.


EDIT: your chipped ECU was chipeed for whatever engine was hooked to it.. Any changes made will effect the tune. You will need the tuner to smooth everything out and get it to run properly. things like AFR and IDLE properties are worked out thru the tuning program.

Your ECU is for the right engine im assuming.. hopefully your not using a vtec ECU for a non vrtec engine and any other mis-matched variables.


Ive read the posts, so theres something missing here.

Have you adjusted the idle screw on top of the TB?
Have you moved the distrib to see if the timing is off?

 

[EG-HATCHIE]

Ok so I ran a stock ecu with stock injectors and it runs decent but still has a very slight miss or lump in the idle, also nothing changes in the idle if I unplug my map sensor and tps??? Could this be a bad map sensor? One more thing is I got the car with the swap alreadyin it, could they have pinned the wrong wires on the ecu for the cel or for the motor swap? maybe my cel is burnt out or cut... I'll check that cluster tonight

 

[RonJ]

One more thing is I got the car with the swap alreadyin it, could they have pinned the wrong wires on the ecu for the cel or for the motor swap? maybe my cel is burnt out or cut... I'll check that cluster tonight

When you turn the key to ON(II), the CEL should turn on and then off after 2 seconds. If the CEL never turns on, the CEL bulb is burned out or the previous owner disabled the CEL circuit, such as removing the CEL bulb.

 

[EG-HATCHIE]

No need to start another thread with your same issue..

Gap your plugs to 22, Use NGK 4091's
Set your fuel pressure to 50-60psi
Use Super Premium fuel only!
limp your ride to a tuner so he can dial everything in.

Isn't 50-60 psi too high ?