Damn carburetor, I need help with a carburetor problem.

Five0 · 12-04-2001, 05:11 PM

I have been having a problem with my carb cutting out every once in a while. I will be driving along and it's like it goes rrrrrrrr blub rrrrrrrrrrrrrr blub rrrrrrrrrr. Sorry that is the best way I know how to describe it. It is like it will cut off for a second and then it will go with out any problems.

Have any ideas on what it could be and how to fix it?

Five0 · 12-04-2001, 08:43 PM

Fostang · 12-04-2001, 10:44 PM

When this happens is the engine warm already? Try jetting leaner on the secondaries? What type of carb is it? Float bowls set correctly? Fuel pressure? Ignition system (which I doubt)? Check it out and let us know

Five0 · 12-05-2001, 08:27 AM

Yes the engine is warm already.

It is a Holley 750 dp vacuum secondarys.

Fuel pressure is set at 7 psi.

The ignition is a digital 6+.

I will try to jet it down it the back a little.

Dark Knight · 12-05-2001, 09:44 AM

doesnt really sound like a carb problem... might check the ground wire for the MSD...

Dangerous Dave · 12-05-2001, 12:29 PM

This does sound more like an ignition problem. If it is eratic like that-if it is a fuel problem-possibly a power valve on the way out. Maybe a little tear that is oopening and closing it. Although this sounds very similar to the problem I just tackled in my 84. Thought for sure it was fuel-almost no question. Worked on the carb for a few hours and I decided to put some new plugs in that I had sitting on the shelf for about a month-while I was thinking about what else to change or adjust on the carb. Ended up that was all it was-just a change in plugs. Fired it up to run to a local parts store to get some info on my carb and it ran perfect. Has been running perfect since then. The plugs that I took out of the car were only about 5 months old-and weren't fouled either-very strange-but glad I didn't spend any more money.

gofastlx · 12-06-2001, 08:24 AM

Don't totally rule out the carb, what intake are you using? I'm using the Torker289, and I had a fuel perculation issue (caused the same issue). I installed a heat shield, and everything was fine.

Just a thought.

Rob

PKRWUD · 12-08-2001, 06:33 AM

Can you be more specific as to when this occurs? Only at WOT? Only while cruising? At what rpms? Under load/no load? Also, what mods have been made to the carb? Have you changed the vac secondary spring? Checked the float level?

Take care,
-Chris

LX5liter · 12-08-2001, 11:28 AM

750 dp AND vacuum secondaries? I assume you just mean vacuum secondaries. Try dropping your fuel pressure to 6 psi and check your float settings. Also if it happens while just cruising at consatnt throttle try a heavier secondary spring.

12-04-2001, 05:11 PM	#1
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	Damn carburetor, I need help with a carburetor problem. I have been having a problem with my carb cutting out every once in a while. I will be driving along and it's like it goes rrrrrrrr blub rrrrrrrrrrrrrr blub rrrrrrrrrr. Sorry that is the best way I know how to describe it. It is like it will cut off for a second and then it will go with out any problems. Have any ideas on what it could be and how to fix it? __________________ James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier.

12-04-2001, 08:43 PM	#2
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	TTT __________________ James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier.

12-04-2001, 10:44 PM	#3
Fostang Registered Member Join Date: Feb 2001 Location: Stockton, Ca Posts: 599	When this happens is the engine warm already? Try jetting leaner on the secondaries? What type of carb is it? Float bowls set correctly? Fuel pressure? Ignition system (which I doubt)? Check it out and let us know __________________ 67' Fastback-Supercharged 4.6 DOHC Cobra, T-56, 8.8 more to come. 67' Coupe-EFI, AOD, 8.8 90 Gt-Supercharged,MAF,TB,1.7's ripper, bassani x, 3.55's, 01' cobras, headers. 89'GT-Supercharged,Heads,Cam,Intake,TB,MAF,power pipe,headers,offroad exhaust,black bullits.

12-05-2001, 08:27 AM	#4
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	Yes the engine is warm already. It is a Holley 750 dp vacuum secondarys. Fuel pressure is set at 7 psi. The ignition is a digital 6+. I will try to jet it down it the back a little. __________________ James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier.

12-05-2001, 09:44 AM	#5
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	doesnt really sound like a carb problem... might check the ground wire for the MSD... __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

12-05-2001, 12:29 PM	#6
Dangerous Dave Registered Member Join Date: Sep 1999 Location: Minneapolis, MN Posts: 121	This does sound more like an ignition problem. If it is eratic like that-if it is a fuel problem-possibly a power valve on the way out. Maybe a little tear that is oopening and closing it. Although this sounds very similar to the problem I just tackled in my 84. Thought for sure it was fuel-almost no question. Worked on the carb for a few hours and I decided to put some new plugs in that I had sitting on the shelf for about a month-while I was thinking about what else to change or adjust on the carb. Ended up that was all it was-just a change in plugs. Fired it up to run to a local parts store to get some info on my carb and it ran perfect. Has been running perfect since then. The plugs that I took out of the car were only about 5 months old-and weren't fouled either-very strange-but glad I didn't spend any more money. __________________ 1984 Mustang 1997 Miata

12-06-2001, 08:24 AM	#7
gofastlx Registered Member Join Date: Jan 2001 Location: Rochester Hills, MI Posts: 40	Don't totally rule out the carb, what intake are you using? I'm using the Torker289, and I had a fuel perculation issue (caused the same issue). I installed a heat shield, and everything was fine. Just a thought. Rob

12-08-2001, 06:33 AM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Can you be more specific as to when this occurs? Only at WOT? Only while cruising? At what rpms? Under load/no load? Also, what mods have been made to the carb? Have you changed the vac secondary spring? Checked the float level? Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

12-08-2001, 11:28 AM	#9
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	750 dp AND vacuum secondaries? I assume you just mean vacuum secondaries. Try dropping your fuel pressure to 6 psi and check your float settings. Also if it happens while just cruising at consatnt throttle try a heavier secondary spring. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

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