Smells rich.Idea's?
Smells rich.Idea's?
So for a LONG time now my 91 has always smelled pretty bad when running. Almost like a rich smell. It runs great! No smoke etc out the tailpipe, just a bad smell that ive ignored since i got it. plugs are clean,no carbon at all. I seafoam it etc and make sure its clean.
Heres what i have replaced in the last 6 months :
plugs ac delco's,then switched to ngk v powers. No change in smell. runs good.
wires,im using autozones brand,or advance auto's. I dont remember
Cap & rotor with brass terminals.
Bosch O2 sensor. (never been fond of bosch,the o2 sensors alright?)
Timing is 4* advanced. Tried it at 0* for a week and no change in smell. so back to 4*
Fuel pump & filter (ac delco)
Temp sensor
180 stat
Ive cleaned the :
throttle body,egr,and iac several times.
One thing ive noticed is the cat was gutted when i got it. Do they make any change in the smell of exhaust at all? The tbi unit has never been rebuilt. Im going to do that sometime soon. Like i said the thing drives great. Idles smooth,never bogs down etc. Its just always smelled funny.
My next idea is the Ignition control module?
Heres what i have replaced in the last 6 months :
plugs ac delco's,then switched to ngk v powers. No change in smell. runs good.
wires,im using autozones brand,or advance auto's. I dont remember
Cap & rotor with brass terminals.
Bosch O2 sensor. (never been fond of bosch,the o2 sensors alright?)
Timing is 4* advanced. Tried it at 0* for a week and no change in smell. so back to 4*
Fuel pump & filter (ac delco)
Temp sensor
180 stat
Ive cleaned the :
throttle body,egr,and iac several times.
One thing ive noticed is the cat was gutted when i got it. Do they make any change in the smell of exhaust at all? The tbi unit has never been rebuilt. Im going to do that sometime soon. Like i said the thing drives great. Idles smooth,never bogs down etc. Its just always smelled funny.
My next idea is the Ignition control module?
Last edited by chris015; Jul 21, 2011 at 01:41 AM.
BF Guru
Joined: Oct 2010
Posts: 5,962
From: Summit Ny
So for a LONG time now my 91 has always smelled pretty bad when running. Almost like a rich smell. It runs great! No smoke etc out the tailpipe, just a bad smell that ive ignored since i got it. plugs are clean,no carbon at all. I seafoam it etc and make sure its clean.
Heres what i have replaced in the last 6 months :
plugs ac delco's,then switched to ngk v powers. No change in smell. runs good.
wires,im using autozones brand,or advance auto's. I dont remember
Cap & rotor with brass terminals.
Bosch O2 sensor. (never been fond of bosch,the o2 sensors alright?)
Timing is 4* advanced. Tried it at 0* for a week and no change in smell. so back to 4*
Fuel pump & filter (ac delco)
Temp sensor
180 stat
Ive cleaned the :
throttle body,egr,and iac several times.
One thing ive noticed is the cat was gutted when i got it. Do they make any change in the smell of exhaust at all? The tbi unit has never been rebuilt. Im going to do that sometime soon. Like i said the thing drives great. Idles smooth,never bogs down etc. Its just always smelled funny.
My next idea is the Ignition control module?
Heres what i have replaced in the last 6 months :
plugs ac delco's,then switched to ngk v powers. No change in smell. runs good.
wires,im using autozones brand,or advance auto's. I dont remember
Cap & rotor with brass terminals.
Bosch O2 sensor. (never been fond of bosch,the o2 sensors alright?)
Timing is 4* advanced. Tried it at 0* for a week and no change in smell. so back to 4*
Fuel pump & filter (ac delco)
Temp sensor
180 stat
Ive cleaned the :
throttle body,egr,and iac several times.
One thing ive noticed is the cat was gutted when i got it. Do they make any change in the smell of exhaust at all? The tbi unit has never been rebuilt. Im going to do that sometime soon. Like i said the thing drives great. Idles smooth,never bogs down etc. Its just always smelled funny.
My next idea is the Ignition control module?
How is your fuel mileage?
How do the plugs look?
With out a functioning catalytic converter to burn up the combustion byproducts, it will smell different than a vehicle with a properly functioning cat. Do you know anyone with a vehicle that isn't running catalytic converters that you could use to compare the smell?
How do the plugs look?
With out a functioning catalytic converter to burn up the combustion byproducts, it will smell different than a vehicle with a properly functioning cat. Do you know anyone with a vehicle that isn't running catalytic converters that you could use to compare the smell?
Did,the pos oil adapter housing was leaking. but i fixed that a long time ago. its not coming from vapors of leaky oil
My dad has his 91 cpi blazer with a cat. His does not smell this way.
Plugs look great. No fouling at all.
Im getting roughly 17 mpg city and 19 highway running 3.42 gears,30" tires.
How is your fuel mileage?
How do the plugs look?
With out a functioning catalytic converter to burn up the combustion byproducts, it will smell different than a vehicle with a properly functioning cat. Do you know anyone with a vehicle that isn't running catalytic converters that you could use to compare the smell?
How do the plugs look?
With out a functioning catalytic converter to burn up the combustion byproducts, it will smell different than a vehicle with a properly functioning cat. Do you know anyone with a vehicle that isn't running catalytic converters that you could use to compare the smell?
Plugs look great. No fouling at all.
Im getting roughly 17 mpg city and 19 highway running 3.42 gears,30" tires.
Last edited by chris015; Jul 23, 2011 at 01:32 PM.
Yes im starting to think its my catty. Problem is i cant buy one at a junk yard since they just scrap them for easy money. Time to find a aftermarket dirt cheap cat. I dont think it matters if its for a blazer or not as long as the pipe size is the same and its not tiny.
Looked at advance auto. I can get a magnaflow for 50 bucks after coupon codes and pick up in store. SCORE!
I wonder how this is going to affect the exhaust tone and performance. truck drives like a raped ape..Oh well,im sick of the smell.
I wonder how this is going to affect the exhaust tone and performance. truck drives like a raped ape..Oh well,im sick of the smell.