Code 45 on a TBI truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C&C Chevy · 03-26-2006, 07:02 PM

"Rich exhaust indicated"

You TBI guys. How do I go about fixing this?

*Rust_Free_Chevy* · 03-26-2006, 07:40 PM

Most likely an O2 sensor.

gchemist · 03-26-2006, 08:44 PM

Read and bookmark this page!!
http://www.cfm-tech.com/GM_tbi_tuning_tips.htm

daveM · 03-26-2006, 09:18 PM

Cat might be plugged.

82c10 · 03-26-2006, 10:02 PM

Quote:

Originally Posted by C&C Chevy

"Rich exhaust indicated"

You TBI guys. How do I go about fixing this?

if its what davem said, cut that sucker off, and weld in a piece of pipe

C&C Chevy · 03-27-2006, 06:07 PM

Replaced the O2 sensor and it still idles very poorly. If I don't keep my foot in it, it wants to die. My code book says the code 45 is "rich exhaust indicated". I replaced the IAC valve already. What about the TPS? Fuel evaporator canister filter? How do I get that filter out to check it? What else would cause a "rich fuel" reading on a TBI engine? Thanks for the replies!

BTW, how do I check for a plugged cat?

82c10 · 03-27-2006, 07:02 PM

the throttle body may also need rebuilt/replaced

bejay · 03-28-2006, 07:06 AM

there is lots of possible causes of rich exhuast may be hard to determine without a scanner to actually see the data of all the sensors, might check timing, check and make sure the egr valve is not stuck open, check for vacum leaks, basicly anything that would affect engine vacum to be low would make the map sensor read higher than normal and cause a rich exhuast code.

C&C Chevy · 03-29-2006, 12:36 AM

82, I'm pretty sure the TBI is in good condition. I just rebuilt it (after crapped out on me!) and it looked brand new after I cleaned it up. No cracks or missing parts.

bejay, wish I had a scanner. Those are really nice. It would eliminate alot of guess work. I'll be sure to check the EGR, and the other things you listed. Thanks.

Anyone know if the evaporator canister comes apart or do I have to buy a whole new one. Autozone lists a replacement charcoal "filter" for it, but damn if I can figure out how to open the thing.

C&C Chevy · 04-01-2006, 12:31 PM

I pretty much let the truck sit all week. I replaced the PCV and started it up this morning. It's still stumbling and I smell a sweet smell. I put my hand behind the exhaust and there's a fuel mist coming out. Starting to think I may have a spark problem now, because the injectors are putting out a good cone-shaped pattern. How do I go about checking this out? I can do plugs, cap and a rotor. What else?

03-26-2006, 07:02 PM	#1
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Code 45 on a TBI truck "Rich exhaust indicated" You TBI guys. How do I go about fixing this? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

03-26-2006, 07:40 PM	#2
Rust_Free_Chevy Account Suspended Join Date: Feb 2006 Location: Atlanta Posts: 41	Re: Code 45 on a TBI truck Most likely an O2 sensor.

03-26-2006, 08:44 PM	#3
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Code 45 on a TBI truck Read and bookmark this page!! http://www.cfm-tech.com/GM_tbi_tuning_tips.htm __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-26-2006, 09:18 PM	#4
daveM Registered User Join Date: Mar 2005 Location: Edmonton, Alberta Canada Posts: 30	Re: Code 45 on a TBI truck Cat might be plugged. __________________ __________________ Dave '87 Chevy Pickup (Nice) '75 CB750K Four Honda (beautiful) Quiet (stock exhaust) Till you get on it then she... Sounds Like a Porsche

03-27-2006, 06:07 PM	#6
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Code 45 on a TBI truck Replaced the O2 sensor and it still idles very poorly. If I don't keep my foot in it, it wants to die. My code book says the code 45 is "rich exhaust indicated". I replaced the IAC valve already. What about the TPS? Fuel evaporator canister filter? How do I get that filter out to check it? What else would cause a "rich fuel" reading on a TBI engine? Thanks for the replies! BTW, how do I check for a plugged cat? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007 Last edited by C&C Chevy; 03-27-2006 at 06:08 PM.

03-27-2006, 07:02 PM	#7
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	Re: Code 45 on a TBI truck the throttle body may also need rebuilt/replaced __________________ *SWB Stands for Short Wide Bed*

03-28-2006, 07:06 AM	#8
bejay Registered User Join Date: Aug 2005 Location: missouri Posts: 136	Re: Code 45 on a TBI truck there is lots of possible causes of rich exhuast may be hard to determine without a scanner to actually see the data of all the sensors, might check timing, check and make sure the egr valve is not stuck open, check for vacum leaks, basicly anything that would affect engine vacum to be low would make the map sensor read higher than normal and cause a rich exhuast code.

03-29-2006, 12:36 AM	#9
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Code 45 on a TBI truck 82, I'm pretty sure the TBI is in good condition. I just rebuilt it (after crapped out on me!) and it looked brand new after I cleaned it up. No cracks or missing parts. bejay, wish I had a scanner. Those are really nice. It would eliminate alot of guess work. I'll be sure to check the EGR, and the other things you listed. Thanks. Anyone know if the evaporator canister comes apart or do I have to buy a whole new one. Autozone lists a replacement charcoal "filter" for it, but damn if I can figure out how to open the thing. __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

04-01-2006, 12:31 PM	#10
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Code 45 on a TBI truck I pretty much let the truck sit all week. I replaced the PCV and started it up this morning. It's still stumbling and I smell a sweet smell. I put my hand behind the exhaust and there's a fuel mist coming out. Starting to think I may have a spark problem now, because the injectors are putting out a good cone-shaped pattern. How do I go about checking this out? I can do plugs, cap and a rotor. What else? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007



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