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Carb wont hold an idle. Dirty jets? #1757748 02/18/15 04:31 AM 02/18/15 04:31 AM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Its a Holley 80508 4 bbl that after start up begins a steady decrease in idle speed until it dies. Takes about a minute or so to finally stop running. Idles great for about 10 seconds, then...... Even if I feather the throttle to keep it running until it starts warming up it will die. Float? 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: Carb wont hold an idle. Dirty jets? [Re: BFASTER] #1757749 02/18/15 06:34 AM 02/18/15 06:34 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	Could be. Do you have a pressure guage in the line? A clear filter to see if it is getting a steady stream of fuel? You should have at least 5 lbs of pressure at idle at a bare minimum. Maybe a worn fuel pump? If it is a big block, is the fuel pump pushrod worn and not giving a long stroke to the fuel pump?

Re: Carb wont hold an idle. Dirty jets? [Re: Kern Dog] #1757750 02/18/15 07:07 AM 02/18/15 07:07 AM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	No...no pressure gauge. And the pushrod is new, less than 800 miles on engine/fuel pump. 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: Carb wont hold an idle. Dirty jets? [Re: BFASTER] #1757751 02/18/15 12:28 PM 02/18/15 12:28 PM
Joined: Jan 2003 Posts: 12,076 Benton, IL. D DaveRS23 Special needs idiot
DaveRS23 Special needs idiot D Joined: Jan 2003 Posts: 12,076 Benton, IL.	Has this combo idled okay before for you and just now started dying at isle? Or is it new to you with no previous experience with it? A few things to check; vacuum leak, initial timing, fuel delivery, dirty fuel, bad PCV valve, proper idle jet, proper idle air bleed, proper float level. Master, again and still

Re: Carb wont hold an idle. Dirty jets? [Re: BFASTER] #1757752 02/18/15 12:37 PM 02/18/15 12:37 PM
Joined: Jan 2004 Posts: 9,066 Eugene, Oregon M minivan master
minivan master M Joined: Jan 2004 Posts: 9,066 Eugene, Oregon	I have had to take my carb apart and clean it 3 times in the 6 years I have had it on the road, due to poor idling characteristics... Yes, it was rebuilt ( its the stock carter that came on the car new) when the car was first put back on the road.. The float bowls had slime and dirt each time.. NEW lines, tank, TWO fuel filters, fuel pump etc..... 8433272-vertbaseball3.jpg (31 downloads)

Re: Carb wont hold an idle. Dirty jets? [Re: DaveRS23] #1757753 02/18/15 12:38 PM 02/18/15 12:38 PM
Joined: Jun 2005 Posts: 5,102 Western Md. skicker "The Champ"
skicker "The Champ" Joined: Jun 2005 Posts: 5,102 Western Md.	I like most others also always blame the carb... Last time I had near the same issue it was the plate in the distributor not returning correctly...A little spray of WD and it was gone... Like a dumma$$ I mentioned it to my engine builder...He said "I wish I could find a way to lock up the carburator in the trunk...as soon as something's not right everybody wants to mess with the carb." ...FAFO...

Re: Carb wont hold an idle. Dirty jets? [Re: skicker] #1757754 02/18/15 12:59 PM 02/18/15 12:59 PM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Does it smell heavy rich? My first though is float level or needle and seat not closing properly causing a loading up situation. I take it that if you clear it out the cycle will start all over again? Careful, your character's showing!

Re: Carb wont hold an idle. Dirty jets? [Re: mopar346] #1757755 02/18/15 01:22 PM 02/18/15 01:22 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	count # of turns to get the 2 idle mixture screws in to lightly seated. Take out the idle mixture screws. shoot a 3 second blast of starting fluid into each of the two ports with ae thin red straw (likely have to work the nozzle so a straw will fit as SF cans do not usually come with/use a straw). replace mix screws to orig # of turns. See if it will now idle live every 24 hour block of time like it's your last day on earth

Re: Carb wont hold an idle. Dirty jets? [Re: RapidRobert] #1757756 02/18/15 01:43 PM 02/18/15 01:43 PM
Joined: Jul 2007 Posts: 11,836 Florida M mopar346 Let me tell ya about fat chicks!
mopar346 Let me tell ya about fat chicks! M Joined: Jul 2007 Posts: 11,836 Florida	Quote: count # of turns to get the 2 idle mixture screws in to lightly seated. Take out the idle mixture screws. shoot a 3 second blast of starting fluid into each of the two ports with ae thin red straw (likely have to work the nozzle so a straw will fit as SF cans do not usually come with/use a straw). replace mix screws to orig # of turns. See if it will now idle Wait before restart dumping that much starting fluid into the engine. Careful, your character's showing!

Re: Carb wont hold an idle. Dirty jets? [Re: DaveRS23] #1757757 02/18/15 03:47 PM 02/18/15 03:47 PM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Quote: Has this combo idled okay before for you and just now started dying at isle? Or is it new to you with no previous experience with it? A few things to check; vacuum leak, initial timing, fuel delivery, dirty fuel, bad PCV valve, proper idle jet, proper idle air bleed, proper float level. It has always idled well. I'll check the things you listed...thank you. 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: Carb wont hold an idle. Dirty jets? [Re: mopar346] #1757758 02/18/15 03:50 PM 02/18/15 03:50 PM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Quote: Does it smell heavy rich? My first though is float level or needle and seat not closing properly causing a loading up situation. I take it that if you clear it out the cycle will start all over again? Yes, it does smell very rich. And I've had problems with the float before, but its been rebuilt since then and no problems since the rebuild until now. (a month at least) 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: Carb wont hold an idle. Dirty jets? [Re: RapidRobert] #1757759 02/18/15 03:51 PM 02/18/15 03:51 PM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Quote: count # of turns to get the 2 idle mixture screws in to lightly seated. Take out the idle mixture screws. shoot a 3 second blast of starting fluid into each of the two ports with ae thin red straw (likely have to work the nozzle so a straw will fit as SF cans do not usually come with/use a straw). replace mix screws to orig # of turns. See if it will now idle I will try this...thank you. 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: Carb wont hold an idle. Dirty jets? [Re: skicker] #1757760 02/18/15 04:20 PM 02/18/15 04:20 PM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER OP mopar
BFASTER OP mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Quote: I like most others also always blame the carb... Last time I had near the same issue it was the plate in the distributor not returning correctly...A little spray of WD and it was gone... Like a dumma$$ I mentioned it to my engine builder...He said "I wish I could find a way to lock up the carburator in the trunk...as soon as something's not right everybody wants to mess with the carb." I will check that...thank you. 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

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