I get a code 45 which is rich exhaust usually when I'm cruising on the freeway but also sometimes when cruising at low speeds. I have replaced my oxygen sensor, spark plugs and wires in the last couple of months. Also when I start up my car for the first time it will let out a huge puff of smoke that has gone from being faint to more obvious. Could the fact that I'm running mobil one 5W30 have anything to do with it? And when I floor it sometimes there will be some faint smoke. My mods are in my sig if that helps. Please help me out with this.

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'91 Z28 305, Auto trans, K&N's, air foil, power pulleys, ported plenum, hypertech chip, hooker cat back, kyb shocks, STB, SLP headers, catco cat, spohn lca's, 14.7@ 93 mph(need new times after exhaust and lca's)

 

Maybe Your Valve seals for smoking problem.. I had the same thing happen to mine after I parked it for a year. Try running 10w-30 for an oil change or two and see if it gets better....

 

my car does the same thing sometimes it smokes on start up and sometimes it doesn't. also when u get on it you say you see some smoke my does that is oil into the chamber and you also my have some carbon. my car has been doing this for years i wouldn't worry about it. it happens to sbc.

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86 Z28:
L98 350
aluminum heads
T-5
235/60R15 BFgoodriches
dual 3"flowmaster exhaust
20% tint
hatch wing
2 12"kicker solos
300 watt Sony xplod amp
Sony xplod deck
K&N air filter
http://www.geocities.com/xmikex.rm/mike.html

 

Valve seats for sure about the smoke on start up. but i hope its not your injectors why the car is burning rich... My Z-28 was burning rich all the time. Tried everything but in the end it was the injectors the resitance was messed up on 4 of them.. so I replaced all of them $130 cdn each... but the car runs like it has never before.. can't get traction at the track with standard radials, time for slicks!!

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92 z-28 G92 black with white racing stripes.
Dynomax cat back
Hypertech chip
5 speed

 

How do I find out if my injectors are working properly? What other things should I check out to fix the rich condition? I will try 10W30 on my next oil change and see if that helps the smoke. Can anyone tell me why it smokes faintly at wot?

 

only thing i know:
V A L V E S E A L S MAN ¡
TAKE THE HEADS OFF AND SIPLY REPLACE VALVE SEALS ...THATS IT ¡

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1982 Pontiac firebird s/e 2bbl..Club organizator in chile southamerica.https://www.thirdgen.org/rides/index.tgo?action=view&rideid=3280

 

Uh...you mean take the VALVE COVERS off, right? It would be ridiculous to remove the heads just for a valve seal replacement. Now valve GUIDES are another animal.

Mine did the same thing when I switched to M1, and a set of Fel-Pro valve stem seals did the trick. Hope this helps.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley AFPR, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Ruger P95DC, hot wife, new oil filter, thick rubber floormats, no cats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."