North American Turbocoupe Organization



blue smoke on decel
bang4thebuck Offline
Senior Member
#1
I dont know what its from but all of a sudden I get some blue smoke at deceleration! Its annoying and I dont think it is valve guides or seals. The car only now has 70000 miles on it so could it be pcv or something? If I hold it at 2500 for 10 seconds and let go it does it too. Im stumped so what could it be??
1987 TC 5 speed. To date: AGP 50 trim T3/T4 .63 stage 2 turbo, Ebay bov, 28psi, 255hp pump, Kirban FPR, Ebay Front mount, Full 3 inch Exhaust, Ported Bob's Log, Megasquirt, 55lb. injectors, boport 1.5 cam, boxed lower control arms, Methanol Kit, Ram HD Clutch, front lowered 1/2 inch and E.T. Streets for the track. Best so far 12.5 at 110.8. still tuning.
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Pete D Offline
Administrator
#2
See if there is oil in the bottom of the IC or in the TB. Also check how much oil in the VAM hose
Pete Dunham


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Jeff K Offline
Administrator
#3
Why do you think it isnt valve guides / seals? 70K miles and 16+ years is enough time / mileage to harden up valve seals and wear guides, especially if it was mistreaded by a former owner (too long between oil changes, etc).

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 23 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 04 Taurus Duratec (wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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PetzJC Offline
Senior Member
#4
"Typically" when driving, blue smoke during decel is an indication of worn rings. I would be surprised if the rings are worn with only 70k miles, unless the car was abused by a previous owner......

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88 Silver T/C, original owner, 261,800 miles.
Loaded with everything except leather & auto trans.
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched.
Spec-II/III combo clutch assembly.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16's.
Former owner of 88 Silver T/C, loaded (except leather & A/T), original owner, 294,815 miles!!!
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched, spec-II/III clutch combo.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16
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Pete D Offline
Administrator
#5
I agree with John on the decel smoking being possibile bad ring(s). It's always possible that an oil control ring was defective, or got tweaked during installation (real rare)
Pete Dunham


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PetzJC Offline
Senior Member
#6
Also, if it were bad valve guides/seals, you most likey would see a puff of blue smoke at startup (especially after sitting overnite).

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88 Silver T/C, original owner, 261,800 miles.
Loaded with everything except leather & auto trans.
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched.
Spec-II/III combo clutch assembly.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16's.
Former owner of 88 Silver T/C, loaded (except leather & A/T), original owner, 294,815 miles!!!
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched, spec-II/III clutch combo.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16
Reply

martin0660 Offline
Posting Freak
#7
I just went through the smoke on decel thing, and it was bad valve seals for the most part. The seal on #3 Exhaust was off the guide. I replaced them all, and it is much better. There is still a little if I really use a lower gear to hold the car back, but it isnt anywhere near as bad as it was.

I suspect I have a worn guide on the valve to make the seal pop off. I will know more in November when I park the car, or sooner if I pop a head gasket first [Image: biggrin.gif]

Bob Myers

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My 88 Thunderbird TC Pictures, Updated 5-8 with a few drag pics
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PetzJC Offline
Senior Member
#8
Valve guide seal is an easy (and inexpensive) replacement. Try that first, especially if you suspect the seals are original. I believe valve seal replacement is covered either under a Tech Article or in FAQ.

------------------
88 Silver T/C, original owner, 261,800 miles.
Loaded with everything except leather & auto trans.
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched.
Spec-II/III combo clutch assembly.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16's.
Former owner of 88 Silver T/C, loaded (except leather & A/T), original owner, 294,815 miles!!!
K&N, Gillis(18 psi), SVO roller #1, big SS valves, ported intake, head, & exhaust.
Short block & turbo original/untouched, spec-II/III clutch combo.
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16
Reply

bang4thebuck Offline
Senior Member
#9
I hope its something stupid! It never does it on startup or when flooring it. ONLY when decelerating. Thats why I am brainstorming. Maybe a seal did pop off a little or something like martin0660 said. Oh yea the prob comes and goes too sometimes it will and sometimes it wont! It just started recently so I guess im going to check the pcv system and look at the valve seals while replacing the valve cover gasket!

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88 TC, 67k miles, T-3 super 60 .63exh., 3"downpipe, Bobs log, 255hp pump, kirban FPR (48psi), 2&1/2 exhaust, gillis 20psi, HKS filter, Dawes a/f meter, big tci trans cooler, supra intercooler, Automatic, 75 shot. Future mods: Got an alcohol injection kit to put on, maybe some porting!
1987 TC 5 speed. To date: AGP 50 trim T3/T4 .63 stage 2 turbo, Ebay bov, 28psi, 255hp pump, Kirban FPR, Ebay Front mount, Full 3 inch Exhaust, Ported Bob's Log, Megasquirt, 55lb. injectors, boport 1.5 cam, boxed lower control arms, Methanol Kit, Ram HD Clutch, front lowered 1/2 inch and E.T. Streets for the track. Best so far 12.5 at 110.8. still tuning.
Reply

bang4thebuck Offline
Senior Member
#10
replaced the pcv and it still does it! I guess its time to think about looking at spark plugs and then valve seals!!! I hope thats it! How common is it for the valve seal to pop off the guide a lil? also how common is it for the exhaust seal in a new turbo to go out and leak oil into the exhaust?? could it be my breather? should I just put a regular breather on it?? villager check valve for pcv??? anyone??
1987 TC 5 speed. To date: AGP 50 trim T3/T4 .63 stage 2 turbo, Ebay bov, 28psi, 255hp pump, Kirban FPR, Ebay Front mount, Full 3 inch Exhaust, Ported Bob's Log, Megasquirt, 55lb. injectors, boport 1.5 cam, boxed lower control arms, Methanol Kit, Ram HD Clutch, front lowered 1/2 inch and E.T. Streets for the track. Best so far 12.5 at 110.8. still tuning.
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