Hello everyone i was wondering if anybody could tell me the reason why my 4.6 is smoking ,First let me tell you what I've done, It's a 1996 GT ,Mac CAI,2003 port and polished plenum and throttle body(half-shafted),and the PCV inline filter(homemade but air tight),underdrive pullyies,3:55 gears,and a BBK catless X-pipe w/ homemade mil eliminators,When i bought the car it had 165000 miles(all highway) but hey for 3 grand and the condition it was in it was a steal,No check engine light comes on ,not yet anyway,when I'm driving the car it doesn't seem to smoke but let's say i stop at a red light and go take off a cloud of smoke rolls out ,not like a batman smoke screen but a nice little cloud ,i was wondering if it might be a bad valve seal or could it be a bad set of rings ,it smokes out of both sides not just one,or could it be a bad injector ,anyone with an idea of what it might be would be helpful,the car purs like a kitten and idle's great.
Smoking problem?
- Thread starter b653gunn
- Start date
mustangman9812
10 Year Member
shallowreef
New Member
Nater
New Member
Is the smoke coming from the pipes or from the engine but "pouring"--for a lack of a better term--under the car? If from the tips, run your finger in there, if it is more than just a dusting on the pipes, there would be a leak someplace internal that is causing it to burn up.
85 Coupe 5.0
Founding Member
i'll chime in on this one, i had the SAME EXACT problem until recently.........
You notice smoke you say? only on takeoff?
I had the same problem, the car would puff a cloud of white/bluish smoke. The longer it sat and idled, the bigger and more intense the puff. Quite annoying. I really only noticed it after I removed my cat's. Mine didn't smoke when you started it cold, only would start smoking after it warmed up a little bit. Never smoked when I was on it at all.
My first solution was to install a PCV oil seperator, which helped, but didn't cure it. I finally found the problem when i did the PI headswap, the exhaust valve stems were caked with black burnt oil deposits, and you could see fresh oil running down the valve stem.
haven't had a problem with the PI heads smoking at all, and man, am I happy.
You could probably install new stem seals, but this would be a temporary fix as I bet the guides are wore with the mileage.
The best solution, install a new of heads or have your current ones re-worked.
just my story........
You notice smoke you say? only on takeoff?
I had the same problem, the car would puff a cloud of white/bluish smoke. The longer it sat and idled, the bigger and more intense the puff. Quite annoying. I really only noticed it after I removed my cat's. Mine didn't smoke when you started it cold, only would start smoking after it warmed up a little bit. Never smoked when I was on it at all.
My first solution was to install a PCV oil seperator, which helped, but didn't cure it. I finally found the problem when i did the PI headswap, the exhaust valve stems were caked with black burnt oil deposits, and you could see fresh oil running down the valve stem.
haven't had a problem with the PI heads smoking at all, and man, am I happy.
You could probably install new stem seals, but this would be a temporary fix as I bet the guides are wore with the mileage.
The best solution, install a new of heads or have your current ones re-worked.
just my story........
TrueBlue03
Member
shallowreef
New Member
back_in_black
New Member
my car had a smoking problem but I put the patch on it's rear quarter panel and have not allowed it to smoke anymore,
85 Coupe 5.0
Founding Member
Seems like a lot of the NPI motors really had this problem, I think every high-mileage one i've seen local has it. And when mine started doing it I did a search here on stangnet and over on TCCOA's forums, and a lot of the 4.6 T-Bird guys were complaining about it also.
it's definately in the guides/seals, so long as it only does it after idleing a while, not while you are on it.
It's definately not condensation, that's white smoke, and doesn't smell like burnt oil. Mine was whiteish/blue and smelled like oil, and my low oil light would come on about every 3 weeks, and i'd have to add 1/2QT.
I'll try to snap a pic of my NPI heads for ya, you can clearly see where it was sucking oil past the guides and seals.
time for a PI upgrade, it's THE MOST gratifying swap i've EVER done to a stang, and possibly the cheapest. If you watch E-bay closely, you can find a good, cheap set. I shat you not, my PI swap, inlcuding fluids and misc. cost me <$600.00. That includes the intake, heater tube, ect. Granted, I got the New PI Intake for $20.00, with the aluminum crossover. God, i love having friends that work at a parts store
Ditch the NPI's, get some PI's and you'll never regret it.
it's definately in the guides/seals, so long as it only does it after idleing a while, not while you are on it.
It's definately not condensation, that's white smoke, and doesn't smell like burnt oil. Mine was whiteish/blue and smelled like oil, and my low oil light would come on about every 3 weeks, and i'd have to add 1/2QT.
I'll try to snap a pic of my NPI heads for ya, you can clearly see where it was sucking oil past the guides and seals.
time for a PI upgrade, it's THE MOST gratifying swap i've EVER done to a stang, and possibly the cheapest. If you watch E-bay closely, you can find a good, cheap set. I shat you not, my PI swap, inlcuding fluids and misc. cost me <$600.00. That includes the intake, heater tube, ect. Granted, I got the New PI Intake for $20.00, with the aluminum crossover. God, i love having friends that work at a parts store
Ditch the NPI's, get some PI's and you'll never regret it.
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