ok guys, I think I have a problem with my turbo teg now…for a couple of weeks, she ran fine at 8 psi …and I was making some ungodly believers outta some other cars…hehehe…but I noticed something…my teg would smoke when I came to a stop after boosting it up… this smoke was the nastiest smoke I’ve ever smelled (of course my cat. converter is gutted anyways) The smoke looked kinda white…anyways…yesterday my teg started missing real bad, so I went and got new plugs and wires for it. it smoked pretty heavy on the way while it inched its way to the auto store…After replacing my plugs, I noticed that my old plugs were somewhat white …and the smoke that was coming out of the exhaust was white also… Now that the plugs have been changed, my car runs fine until I hit about 3 psi, and then it starts missing real bad again…(it still smokes)
anyone know what would cause it to miss only under boost? would a blown head gasket cause this?if so I guess its just time to change out the factory gasket and put in a copper one…I just need some help in diagnosing this problem!!!
sounds like a blown head hasket, that white smoke is coolant. To confirm this, do a compression test, you can drain your oil and check to see if any coolant is mixed with the oil. Blown headgasket usually comes from overheating or detonation. Stock head gaskets work fine, if you want copper make sure you spray some head gasket sealant cause copper does not seal as well.
weren’t you running with stock injectors & no fmu?
Originally posted by qwkteg125
weren’t you running with stock injectors & no fmu?
If so, that’s your answer.
ok heres my setup to date:
b&m commandflo fpr
holley fmu<---- I wouldnt reccomend this to anyone
stock injectors
SAFC <—though I havent noticed any diffference with this
BBK 255 lph in tank pump
I ran a compression test, and all cylinders were between 150-160 psi
I’m wondering if I just have yet another ignition problem…
I checked the new plugs
oh and the smoke isnt white…I got a better look at it today…its more grey than anything else…
the car only misses when its under a load…not at idle or easy driving…
the last time it did this, I had a spark plug wire that was falling apart…it ended up burning up the ignitor before I could find the problem…I changed out the plug wires yesterday, so I know thats not the problem…and the ignitor on it now is about 6 months old.
Im thinking its either something to do with the ignition, or one of my injectors is keeling over…hehe
if I stay on the gas when it misses, it will generally miss until I let off of it, when it will sometimes backfire, like it just wasnt sparking until I took the load off of it…
any ideas/suggestions?
Whats the spark plug gap? the gap should be around .030
Is the holley fmu is rising rate right by boost?whats the ratio?
the spark plug gap is about .37 on ngk plugs… I would rather have denso iridium ones though, since they can handle a larger plug gap better…
at idle my fuel pressure is at @45 psi
when I rev it up, it jumps to about 60 psi, but that doesnt give the turbo long enough to spool up enough to really show any boost related increase in the fmu.
the instructions for the fmu show it at about 75 psi at 10 psi boost
NOTE: it misses even if I set the wastegate open, to where it wont boost at all…is there any way that the problem could be an injector? is there any way to test the injectors?
What step plug are you using? Also, the FUEL pressure should be alot higher under boost, 45 at IDLE is right, but your FMU should be putting it over 100psi.
try lowering the gap to .030 or even lower if it still misfires. iridiums arent worth it imo.
hmm well this is another thing I dont like about the holley fmu…with static pressure set at 40 psi, it doesnt hit 100 psi until about 16 lbs of boost. so I’m guessing if i raise it to 50 psi static pressure, that would set the pressure under boost to hit 100 psi at 10-11 psi… so I guess this thing has a really sucky ratio. the only way to change the ratio, is by adding plates to highten the top of the fmu, which would only lower the pressure rate of rise…I will try the smaller spark plug gap in the morning and see if it helps… I might want to raise the static pressure a tad also.I’m just hoping I can get this figured out soon… I have a car show at the end of this month that my car will be in…I’ve already payed the entry fee…
oh, on another note, how do my compression readings sound?
are they ok?
and another thing…I have noticed that air blows OUT of the hole in the valve cover…where the hose is supposed to run to the intake pipe… I thought the air here is supposed to run IN it and out throught the pcv valve? I think the box under the pcv valve may be stopped up, or the valve needs to be replaced… I made my own catch can between the pcv valve and the intake side of the turbo, but I have yet to see any signs of anything moving through it… however the box thing under the pcv valve has oil crap all over it…wouldnt hurt to change out the pcv valve anyways…
Ditch that FMU, bro. At 6 psi you should have 100psi on stock injectors. 50psi base FUEL pressure is going to richen up your mixture at IDLE(kind of a give and take) Are you getting any detonation on your plugs?
One question, how did you find out your not getting 100psi of FUEL till 16psi? Hopefully, not the way I’m thinkin:shock:
the fmu comes with a graph showing what the fuell pressure will be at different boost levels with and without the pates…wheres the best place to find a vortech fmu? thats the one I really want. I payed like 185 for this one from summit. isnt it true that you can run lower fuel pressure if your injectors are bigger? So I’m thinking my options are either buying bigger fuel injectors, or buying the vortech fmu and injectors later…
what fmu are you running integracon? as for my plugs, they looked pretty good when I took them out…they just had a SMALL amount of white-grey haze to them…it wiped right off… when I boosted with this fmu before, on RARE occasions it would lean out on the A/F guage and all I would feel was just a power loss…
I’m runnin a Vortech FMU 12:1 Disk, along with an inline FUEL pump. On my dyno run, my inline FUEL pump cutout and my A/F rate was 16:1! This was at only 6psi and my plugs showed no detonation.
ok, I’m starting to feel better now…I just bought a vortech fmu for 90 bucks with the 12:1 disk 
once I get it, I’ll just take the holley one off and throw it up on ebay…hopefully I can get at least 90 bucks out of it since I’ve only ran it for a couple of weeks, and it was like 185 new…and I’m including the EARLS fittings I bought for it to connect to fuel line…
where did you get that FMU for $90!? please let me know
I got it off of ebay…some guy was selling it BRAND NEW with a buy it now price of 90 bucks…
I think that will cure your lean problem. I would still like to know how you saw theFUEL pressure at 16psi:p 
the MANUAL that came with the holley FMU had a CHART on it showing what the fuel pressure would be at boost levels up to 20psi…thats how I knew but things have changed now, and all of my stuff is on EBAY! I am moving out, and I am forced to sell everything and go back to n/a. if anyone is intersted on any turbo parts, check out my auctions…they are pretty reasonable! just do a search by my ebay username: 93integraman