Timing and smoking issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

msgross · 09-21-2006, 07:32 PM

Hello,
Just replaced a Q-jet and stock intake with a Holley 1850-3 (600CFM) and Edelbrock performer intake (2101) on my stock 327 4 speed (also added HEI). It's a used carb so I am looking to rebuild it but...

It surges at idle and is smoking like crazy now! I have heard that a vacuum leak could cause the surging but the smoke too? I set the timing to all places and it does the same, so it's back to TDC. (what's the best timing for this?) Should I rebuild carb then try again or search for a leak (best method?) The mixture screws on the Holley seem to do nothing either. Thanks for the help... ______________________________________________________

My Garage:
1968 SWB K-10
2005 Tahoe
UH-60A/L Helicopter
FLY ARMY!

cdowns · 09-21-2006, 07:37 PM

black smoke could be way too rich
white smoke bad seal of intake manifold and your leaking coolant into the intake ports
that rubber fuel line is the classic way to burn your truck to the ground

msgross · 09-21-2006, 07:49 PM

mostly black smoke....mixture screws don't change anything so I figure a rebuild couldn't hurt. Fuel line is only temp, works fine until I put truck on the road...just don't get it near the exhaust! thanks...
______________________________________________________

My Garage:
1968 SWB K-10
2005 Tahoe
UH-60A/L Helicopter
FLY ARMY!

**special-K** · 09-21-2006, 11:04 PM

Inspect rubber fuel lines,you`ll be fine.4" or 24".the same risk.There must be a reason they make fuel-rated hose.

msgross · 09-22-2006, 08:12 AM

It's fuel rated rubber hose....

I am still trying to find out info on the surging and smoking...should I start with the carb and rebuild it? Then look into the intake?
______________________________________________________

My Garage:
1968 SWB K-10
2005 Tahoe
UH-60A/L Helicopter
FLY ARMY!

MrC1 · 09-22-2006, 11:58 AM

Blown power valve?

The mixture screws not working sounds like you've got the throttle plates open too far, possibly compensating for the extra richness (mmmm, sounds like one of those Pilsbury commercials ---- sorry, it's lunchtime and I'm hungry!

)

09-21-2006, 07:32 PM	#1
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Timing and smoking issue Hello, Just replaced a Q-jet and stock intake with a Holley 1850-3 (600CFM) and Edelbrock performer intake (2101) on my stock 327 4 speed (also added HEI). It's a used carb so I am looking to rebuild it but... It surges at idle and is smoking like crazy now! I have heard that a vacuum leak could cause the surging but the smoke too? I set the timing to all places and it does the same, so it's back to TDC. (what's the best timing for this?) Should I rebuild carb then try again or search for a leak (best method?) The mixture screws on the Holley seem to do nothing either. Thanks for the help... ______________________________________________________ My Garage: 1968 SWB K-10 2005 Tahoe UH-60A/L Helicopter FLY ARMY! Attached Images

09-21-2006, 07:37 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Timing and smoking issue black smoke could be way too rich white smoke bad seal of intake manifold and your leaking coolant into the intake ports that rubber fuel line is the classic way to burn your truck to the ground __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 09-21-2006 at 07:39 PM.

09-21-2006, 07:49 PM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Timing and smoking issue mostly black smoke....mixture screws don't change anything so I figure a rebuild couldn't hurt. Fuel line is only temp, works fine until I put truck on the road...just don't get it near the exhaust! thanks... ______________________________________________________ My Garage: 1968 SWB K-10 2005 Tahoe UH-60A/L Helicopter FLY ARMY! Last edited by msgross; 09-21-2006 at 07:49 PM.

09-21-2006, 11:04 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Timing and smoking issue Inspect rubber fuel lines,you`ll be fine.4" or 24".the same risk.There must be a reason they make fuel-rated hose. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-22-2006, 08:12 AM	#5
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Timing and smoking issue It's fuel rated rubber hose.... I am still trying to find out info on the surging and smoking...should I start with the carb and rebuild it? Then look into the intake? ______________________________________________________ My Garage: 1968 SWB K-10 2005 Tahoe UH-60A/L Helicopter FLY ARMY! Last edited by msgross; 09-22-2006 at 08:13 AM.

09-22-2006, 11:58 AM	#6
MrC1 Dork For Days Join Date: Aug 2005 Location: Dallas Posts: 407	Re: Timing and smoking issue Blown power valve? The mixture screws not working sounds like you've got the throttle plates open too far, possibly compensating for the extra richness (mmmm, sounds like one of those Pilsbury commercials ---- sorry, it's lunchtime and I'm hungry!) __________________ 1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby!



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