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#1 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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I've got a Demon problem
I'm having some issues with my Road Demon 625, first, it is setup stock & runs way too rich, smells like raw gas fumes when it's running, but the more serious problem is that it has been sticking at a very high idle, like 2,500-3,00 rpm's so I jam the throttle pedal to try to kick it down, but it will usually end up in an even higher idle & I have to turn off the truck to keep it from over revving, but the weird thing is, after I turn the key to start it, without touching the gas pedal, it starts right up at it's normal idle, any ideas? I love these demon carbs, it made my truck alot faster, but this is rediculous. I also have problems with the choke butterflies closing shut even ehen the truck is warm.
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#2 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: I've got a Demon problem
Sounds like you need an exorcist. lol
FWIW I've heard lots of good stuff about those carbs. s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() |
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#3 |
GEARHEAD
Join Date: Jan 2007
Location: CENTRAL,PA
Posts: 2,284
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Re: I've got a Demon problem
I bought one a few years back and had nothing but problems! One other than yours was after I shut the truck off carb would continuosly leak fuel into the engine. I even tried rebuilding the brand new carb and a handful of other fixes nothing worked. I also have heard many GOOD thing about these carbs. My experiences just turned me off on them. There may be someone else that has better luck with them that can help GOOD LUCK.
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#4 |
Registered User
Join Date: Mar 2006
Location: York Nebraska
Posts: 64
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Re: I've got a Demon problem
I had the exact same problem with my speed demon series carb, i realized that my secondaries were sticking that was the problem, if you losen the bolts and move the carb and make sure that your secondaries arent hitting the carb spacer, mine were, after you do that close them and fill the entire carb with carb and choak cleaner, mine had some gum on the butterflies in which they werent closing, also you need to add a stronger throttle spring, and for the last one, on the throttle linkage you will see a small rod which opens and closes the secondaries sometimes a very small bend in this rod will ensure they close everytime i had to bend mine a little because when the throttle was released it wouldnt push them all the way shut, if you need any additional help my cell phone is (402)366-9181 i would be glad to help you anytime.
1. Check and see if the secondaries are hitting on the carb spacer if they are move the carb untill they are free 2.Close the secondaries and fill the entire carb with carb and choak cleaner and let it soak, do this 2-4 times. 3.Add a stronger throttle spring to make sure it closes all the way. 4.Adjust the rod that closes the secondaries by bending it. |
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#5 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
Hey thanks for the reply guys, I am really stuck, I don't even feel confident in driving the truck now until I get this fixed, the other day it stayed at 3,00 RpM's & it was rainging & I had a bit of a hard time stopping at a light, I unhooked the power wire to the choke & nothing changed, the thought about the secondaries hitting the spacer is a good one, I'll check that out, I totally cleaned & soeaked the carb in carb cleaner before I installed it & it looked shiney & new, I like these carbs & would consider buying a new one even if this one is just a Lemon, the guy I bought it from said he changed it out to a Holy because it wouldn't hold a consistant idle, boy that is an understatement. I even tried it wih no air cleaner to make sure thats not catching on anything & no change.
What I don't get is the high idle 3,000rpms, will go away from just shutting it off & restarting it without touching the pedal. |
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#6 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: I've got a Demon problem
No worries man. You own IMHO the best carb out there.
I have had all of the same issues and it's because it's just not set up right, yet. Like mentioned above, especially if you're using a spacer, you're butterflies are getting hung up. To make the choke work right loosen the three alan screws and turn the choke mechanism to the "-" sign and that will fix you up. The thing is with these carbs is, they are very sensative as far as tuning goes. The air/fuel adjustment screws should be turned in 1/16th increments. Holley's are made to work with a much broader variety of applications and are therefore you can't get them quite as dialed in. Not slamming Holley's, I like em'. But a Demon is just a different carb. Anyway, I've had 3 demons and know them very well. Feel free to PM me if you can't get it resolved and I'd be happy to help you get er done. Good luck! B |
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#7 |
Registered User
Join Date: Mar 2006
Location: York Nebraska
Posts: 64
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Re: I've got a Demon problem
you also may have to cut your air cleaner pan, check www.barrygrant.com for more details on that, i had to do that because the choak was hittin on the air cleaner and it was holding it at about 2100 rpm
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#8 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: I've got a Demon problem
I'm not smart enough to answer even though I love my Demon but I would try to totally disconnect the choke to rule that part out of the problem. Other than that I have no clue what to look for.
__________________
Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#9 |
Registered User
Join Date: Mar 2006
Location: York Nebraska
Posts: 64
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Re: I've got a Demon problem
the next step, email or call demon about it, they are geat with technical support and tuning issues.
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#10 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
I e-mailed them yesterday & havent' heard back yet, I'm about ready to chuck it & buy a new carb.
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#11 |
Registered User
Join Date: Mar 2006
Location: York Nebraska
Posts: 64
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Re: I've got a Demon problem
dont chuck it, send it to me if you dont want it
![]() ill pay shipping
__________________
http://www.cardomain.com/ride/2269113 http://classictruckworld.tenmagazine...ry.ten?id=3895 Last edited by 71cheyennezz4; 02-09-2007 at 05:39 PM. |
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#12 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
I only paid $150 for it so I can't complain too much, but if I do buy new I'll let you know, I'm kinda leaning towards the speed demon.
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#13 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: I've got a Demon problem
That's what I run and I love it!!!!!
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#14 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
Hey 70C10, I think this is the forst time I ever posted a question & you didn't have the right answer for me,
you got the flu or something? ![]() I forgive you 100% You have had great advice/info for me in the past & i really apprecite it. ![]() Last edited by 71chevylowrider; 02-09-2007 at 07:05 PM. |
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#15 |
Senior Member
Join Date: Oct 2006
Location: Edmonton Alberta
Posts: 458
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Re: I've got a Demon problem
I never ran a demon but never heard to many good things about them
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#16 |
67-72 parts finder
Join Date: Aug 2006
Location: southeast mo
Posts: 788
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Re: I've got a Demon problem
i had tried a race demon on my buick 455 race car, what a joke had nothing but trouble with it and the quadrajet i had built was a lot better, ended up with a q jet back on it until i got a 850 dbl pumper dialed in for it, all in all i was happier with the q jet
__________________
![]() ![]() 1981 chevy scottsdale lwb 2wd (parts chaser) 2004 pontiac gto (daily driver) 2004 pontiac grand prix gt (the ol ladys car) 1985 chevy short wide 1970 chevy c10 lwb (another parts rig) 1969 gmc lwb (rainy day project) 1968 chevy lwb c10 250 I6 3 spd (soon to be swb) |
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#17 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
Dang, I am no carb guy either, I was happy that I could bolt it on & get it dialed in to haul a$$, but if Demon take a little tinkering all the time, I may have to re-think my carb choice, fast is fun, but reliability is very important.
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#18 |
Registered User
![]() Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Re: I've got a Demon problem
This is the first I hear anything bad about Demon. A friend of mine who's a mechanic bought a road demon for his car and told me it was superior to any carb he's ever had. I have a brand new Speed Demon on order from a local Demon Dealer, and he swears by them. He said once you set it, you're done, and should never have to mess with it too much. He also said that out of over 5000 which he's sold, only one has had to be sent back. The guy is a performance marine engine builder, and he's seen good horsepower gains on the dyno with just a simple bolt on of a demon. Obviously the guy who sold it to you knew something. Maybe he messed it up some how?
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#19 | |
GEARHEAD
Join Date: Jan 2007
Location: CENTRAL,PA
Posts: 2,284
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Re: I've got a Demon problem
I thought I just got a lomen. Sounds like other as well. I do know people that have run them with no problems, but I have worked on alot of carbs and like I said before.-
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#20 |
Senior Member
Join Date: Sep 2006
Location: Vancouver, WA
Posts: 1,015
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Re: I've got a Demon problem
Hey thanks for all the great replies, I really appreciate it, my truck is too nice to have it running like crap & flooding & now the high idle crap, i do know the Demon I bought is several years old, so maybe it was a bad one from the start, who knows, I just need as much in put from people who use them to help me make a decision, I know the edelbrock I used to have was reliable, but man this Demon when it was working good made my truck so much faster it's amazing, I'm thinking about a Speed Demon, I just don't want to have to keep tuning it.
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