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#1 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
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miss at slow acceleration and cruise
My truck has a little miss when accelerating normal and at cruise going thirty forty fifty and seventy just whatever. It runs perfect idling and laying it to the floor. Ive looked at my plug wires when it is dark outside and can see a tiny glow coming from plug wires 2, 3, 4, and 7. I replaced the plug wires with others just to see and its still i small glow. I dont know whats going on for sure. Also if your getting up to speeds very slowly sometimes it will backfire. it sounds like its coming through the carb.
any help would be awesome. thank you
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#2 |
Registered User
Join Date: Mar 2008
Location: Sarasota, Fl.
Posts: 441
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Re: miss at slow acceleration and cruise
Just get a toyota gas pedal installed and that will fix it all. Just kidding, not for sure but it could be timing is off a little or carb may need some adjusting. Is all your vacuum lines hooked up corectly or open ports blocked off some how? You shouldn't be getting any glow from wires. Did you replace them with new wires or some used ones? Try siwcthing wires around if you have used ones to see if the glow changes as well. ??
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#3 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
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Re: miss at slow acceleration and cruise
yeah my plan for today is spray carb cleaner over intake to check for vacuum leaks... i didnt switch a plug wire that i knew wasnt glowing with one that is glowing. ill try that. so im still stuck with timing, vacuum leak, or wires. thats prob all ill get with out someone actually looking at it.
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#4 |
Registered User
Join Date: Dec 2008
Location: OKC, OK
Posts: 29
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Re: miss at slow acceleration and cruise
I had an issue with a miss only during light accel or cruise, turned out to be a bad reman distributor. Would only occur during vacuum advance operation, didn't happen with idle or heavy throttle where there was no vac advance. Doesn't explain your wires. Good luck.
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#5 |
Cops, ha, catch me if you can!
Join Date: Jun 2009
Location: Santa Barbara, CA.
Posts: 271
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Re: miss at slow acceleration and cruise
Its hard to tell by your avatar, but do you have headers? If you do, make sure the wires are not touching them. I had a similar problem, turned out to be burnt wires ( they did not glow), also the plugs for # 5 & 7 cylinders where backing out. Check all your plugs and make sure they are tight.
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72 C-10 Stepper 350/TH350 3.73 in the back Edelbrock intake and Carb Hooker Comp Headers 275/60R15 on Rallies ![]() ![]() |
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#6 | |
"THE GREEN GOBLIN"
Join Date: Mar 2008
Location: Fremont Ca.
Posts: 1,025
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Re: miss at slow acceleration and cruise
Quote:
A miss at slow acceleration,timing would be my guess, I was driving around like that for a while found out my distributor tie down bolt was loose so timming was off fixed it now no back fire..
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![]() "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi ![]() Drive it like you stole it! ![]() Petey-pablo@sbcglobal.net Last edited by petey-pablo; 03-24-2010 at 06:20 AM. |
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#7 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: miss at slow acceleration and cruise
sounds like a vaccume leak/ timing /or running very lean
carb cleaner will cause motor to speed up if it's sucked in thru a vaccume leak// check condition of sparkplugs theres charts in service manuals that will help you "read" the spark plugs
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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 |
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#8 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
|
Re: miss at slow acceleration and cruise
alrighty ill try to advance my timing just a tad more. I advanced it a little yesterday and it made the problem a little better. But if i did it anymore it would diesel on when i kill it. so idk whats going on for sure. Im gonna buy new taylors then mess with the timing a little more
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#9 |
"THE GREEN GOBLIN"
Join Date: Mar 2008
Location: Fremont Ca.
Posts: 1,025
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Re: miss at slow acceleration and cruise
Cool I did not know that, it's nice to learn something new Thanks....
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![]() "THE GREEN GOBLIN" 1972 Cheyenne 10 Short Fleet Side Front 2.5inch Spindles with 2inch Springs Rear 4inch drop Springs. 454BBC TH400,Posi 1971 Cheyenne 10 Long Fleet Side 454BBC TH350,Posi ![]() Drive it like you stole it! ![]() Petey-pablo@sbcglobal.net |
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#10 |
Registered User
Join Date: Nov 2009
Location: Mesa, AZ
Posts: 226
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Re: miss at slow acceleration and cruise
Please post up what you find out. I've been chasing this for a while now. Feels almost like someone is lightly tapping the brakes when I'm at a steady speed and I'm getting the backfire occasionally too.
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#11 |
Registered User
Join Date: Mar 2008
Location: Sarasota, Fl.
Posts: 441
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Re: miss at slow acceleration and cruise
D-Rat, how old is your motor? I haven't had this happen before, but is your timing chain old enough to strech causing the timing to jump around? Just thought I would throw this out there.
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#12 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
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Re: miss at slow acceleration and cruise
yeah thats kinda what mine is like also. i advanced it a tiny bit more and got it running better still. gonna advance a tiny more tomorrow then tighten my distributor clamp down for good!
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#13 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: miss at slow acceleration and cruise
What carb are you running? I have a holley 670 street avenger that was still at stock jetting, and it did the same think + some bucking with light acceleration. I did some research and found that they are jetted really lean from the factory, so I upped the jets some today (found some good starting recommendations online) and that made a huge difference. I just got back from some test cruising and I had a smile plastered on my face! Not only did it fix the bucking and missing, but it made the top end pull alot harder (4000+ rpm). Good luck tuning yours.
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#14 |
Registered User
Join Date: Nov 2009
Location: Mesa, AZ
Posts: 226
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Re: miss at slow acceleration and cruise
It was a complete rebuild only 12k miles ago.
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#15 |
Registered User
Join Date: Feb 2006
Location: henderson ky
Posts: 196
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Re: miss at slow acceleration and cruise
Are you running an HEI distributor? If so make sure your plug gap is correct. I set mine at .045. Also, make sure your plug wires are crossed and not running parallel to each other. I the wires are running side by side they can jump spark to each other.
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#16 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
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Re: miss at slow acceleration and cruise
I got my timing set about right now. Still got bout three plug wires glowing right at the spark plug. Im ordering some new taylors here soon.
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#17 |
Cops, ha, catch me if you can!
Join Date: Jun 2009
Location: Santa Barbara, CA.
Posts: 271
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Re: miss at slow acceleration and cruise
Have you checked to see if the wires that are glowing are burnt. If you have headers that is a common problem. When you get your new wires, make sure they kept as far away from your headers, if you have headers that is.
Hope the new wires will fix your problem.
__________________
72 C-10 Stepper 350/TH350 3.73 in the back Edelbrock intake and Carb Hooker Comp Headers 275/60R15 on Rallies ![]() ![]() |
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#18 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: miss at slow acceleration and cruise
They also have header spark plugs that are a little shorter to help out with header clearance too. I think they are made by accel.
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#19 |
Senior Member
Join Date: Jul 2004
Location: Clarks Hill, Indiana
Posts: 733
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Re: miss at slow acceleration and cruise
have you checked your timing chain for stretch? put a light on it, and see if it's steady, or bounces around a little.
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1969 K10 - V8, 465, 205, 12 bolt, D44 2002-current 1969 K20 - V8, 465, 221, Eaton, D44 2012-current Nothin' but drums on all 4 corners! past horses in the stable 72 C10-short step (97-02), 68 C10-long fleet (06-12) |
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#20 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
|
Re: miss at slow acceleration and cruise
yeah me too im gonna get the taylors that say are made for headers. and it couldnt be my timing chain since it has a gear drive haha
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#21 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: miss at slow acceleration and cruise
I think you need to tune your carb.
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#22 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
|
Re: miss at slow acceleration and cruise
I put new plug wires on and still getting a little glow from cylinders numbers 2,3,4,and 7
Im gonna replace the plugs now. They were brand new when i started having this problem. Is there a chance that someone could have dropped the spark plugs and messed up the porcelein or something?
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#23 |
S.D.M.F.
Join Date: Jan 2007
Location: Westport, In
Posts: 639
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Re: miss at slow acceleration and cruise
i am having the same problem
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1969 Chevy Longhorn 396/400 3/4 ton. ![]() 1991 Chevy Camaro RS 305/700r4 ![]() 1978 Honda XL175 and XL350(the evil twin) ![]() 2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc ![]() |
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#24 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
|
Re: miss at slow acceleration and cruise
well ill let you know if i figure it out and you let me know im doing the plugs either today or tomorrow
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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#25 |
72 chevys 4 life
Join Date: Aug 2008
Location: Crescent,Ok
Posts: 406
|
Re: miss at slow acceleration and cruise
changed the plugs and still the same problem. is there any way it could be the carburetor? When adjusting the two screws on the front of an edelbrock the motor should want to die when screwed all the way in right?
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I dont call it being young and dumb....I call it young and havin fun ![]() |
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