is this blow-by?

BlackVert

15 Year Member

Oct 3, 2003

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Bethesda, MD

Mar 25, 2006

#1

• Mar 25, 2006

• #1

the other day, i was sitting at a stop light and a vette pulled up next to me.

we started off normally, but then he opened it up, so i opened it up too. then at about 3000 rpms, all of a sudden the car felt like it died for a second and then came back to life. and there was cloud of smoke behind me.

this has happened 3 times so far, and it scares me.

i have also noticed that if i open the throttle to about 2/3 or so, i can see some smoke behind me then too. it looks like it might be oil smoke.

would blow-by cause that? or might i just be really rich, so much so that it can kill the spark?

 

The Green GT

No 13 year olds are safe around me.

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#2

• Mar 25, 2006

• #2

My car did the exact same thing except with out the smoke last time a riced a Vette.

 

DeadLifter

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Mar 1, 2006

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Portland, IN

Mar 25, 2006

#3

• Mar 25, 2006

• #3

Black smoke is gas.
Blueish grey is oil.
White is water.
My car did that a few times was just a loose battery cable when I'd hit the gas it would make the car stall from moving the cable a little.

 

The Green GT

No 13 year olds are safe around me.

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#4

• Mar 25, 2006

• #4

DeadLifter said:

Black smoke is gas.
Blueish grey is oil.
White is water.
My car did that a few times was just a loose battery cable when I'd hit the gas it would make the car stall from moving the cable a little.

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Seriously? I know my car has a loose connection cause my clock is always getting reset. But no matter how I thighten it up it just wont hold good enough.

 

Zero Signal

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Feb 24, 2003

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Mar 25, 2006

#5

• Mar 25, 2006

• #5

I wouldn't think blowby would be a sudden and intermittent thing like that. I'd bet it's something else, more than likely a tune or electrical bug.

 

xc_myers_06

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Aug 6, 2004

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Mar 25, 2006

#6

• Mar 25, 2006

• #6

did u even have a good shot to beatin that vette?

 

The Green GT

No 13 year olds are safe around me.

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Mar 25, 2006

#7

• Mar 25, 2006

• #7

xc_myers_06 said:

did u even have a good shot to beatin that vette?

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If youre talking to me, my stock Mustang beat him by about half a car length. But I know that something was either wrong with the car, or the driver was an idiot. But I still beat him.

 

95CobraMike

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#8

• Mar 25, 2006

• #8

xc_myers_06 said:

did u even have a good shot to beatin that vette?

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i'm going to say yes....

 

urban96

bubb rubb says:"woo woooooo"

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Mar 25, 2006

#9

• Mar 25, 2006

• #9

spark blow out maybe? anything done to the ignition?

 

SVT3183

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#10

• Mar 25, 2006

• #10

off topic, but blackvet, i'm curious what #'s of boost you're running and what numbers you're making with those mods

 

DeadLifter

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Mar 1, 2006

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Portland, IN

Mar 25, 2006

#11

• Mar 25, 2006

• #11

Check the wires on battery, wires leading too battery, coil wires, etc.

 

BlackVert

15 Year Member

Oct 3, 2003

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Mar 25, 2006

#12

• Mar 25, 2006

• #12

believe me, i know what oil smoke looks like. my wife's minivan was burning oil for like a year before we got rid of it.

to me, what i saw in the rear view mirror in the seconds after this event (while i was freaking out about wtf had just happened) looked like oil smoke. it was not dark enough to be gas, and there was way too much of it too.

i saw the gas smoke from the vette when he stepped on it, that (and the roar from the engine) was my first clue that he had stepped on it.

xc_myers_06 said:

did u even have a good shot to beatin that vette?

Click to expand...

i don't know, i doubt it. i think it might have been a z06 because it had those vents on the sides near the rear wheels, but i'm no expert on vettes, so who knows?

and i have been afraid to really get on it much because i still don't have much confidence in my tune.

SVT3183 said:

off topic, but blackvet, i'm curious what #'s of boost you're running and what numbers you're making with those mods

Click to expand...

i don't know that either. i have not had it dynoed yet and i haven't installed the boost gauge yet. it is the 8# pulley, but that it for a 1.5L and mine is a 1.8L, so the boost is probably at least 8#, maybe even 9# or 10#

urban96 said:

spark blow out maybe? anything done to the ignition?

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no ignition mods, could be spark blow out i guess. would there be smoke from that?

 

95CobraMike

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Mar 26, 2006

#13

• Mar 26, 2006

• #13

yeah sprark blow out is a mother.... can be fixed with spark plugs gapped at like .030 and an MSD ignition msd stands for multipule spark discharge which i am assuming it sparks more than once to burn all of your fuel and even if your first spark is blown out, you got the next one

usually with spark blow out, it only happens under load/psi's and it make is feel like you have no power along with one or more horrible misfires

 

95CobraMike

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#14

• Mar 26, 2006

• #14

oh, and i forgot.... the smoke could be from the spark blow out. no spark = left over gas.... it could be the unburnt fuel coming out it'd probably be darker smoke

 

illwood

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Apr 3, 2004

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Worcester, MA

Mar 26, 2006

#15

• Mar 26, 2006

• #15

A compression test would be a good first check to see if you any leaking that would cause blow-by on any of your cylinders.