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Author Topic:   baaaaa ba ba baaaaaaaa ba ba baaaaaaaa
bubba0six
Dirt Maniac

Total posts: 146
posted April 24, 2005 07:42 PM  
help! ran hot laps everything was great, finished 2nd in the heat race, every thing was fine, started the race evarything was fine out of turn 4 and down the front straightaway went into 1 fine came out of 2 and gased up and it sounded like i was floating the valves all the way down the back chute. every time i gased up it happened. idles fine and runs good upto 3500 rpm. ANY IDEAS? THANKS GUYS.

Raceman17
Dirt Maniac

Total posts: 165
posted April 24, 2005 08:13 PM  
So it ran fine and then started acting up? It might be a bad coil or module in the distribitor.

redneck racing
Dirt Forum Champ
Total posts: 860
posted April 25, 2005 01:20 AM  
Sounds like a sick sheep, but in all reality I agree with raceman, but i would also check the main power wire to the toggle, happened to me one night at speed down the front straight then a big pop and nothing lost all power thought it was in distributer but was main wire to toggle.Is car flooding? Eddie

Steve Dupree
Dirt Freak

Total posts: 316
posted April 25, 2005 04:29 AM  
There is a guy on here last week that had same problem and one of his A arms pinched the fuel line. Let us know what it is when fixed and hope its simple.

bryanb30
Dirt Freak

Total posts: 243
posted April 25, 2005 07:28 AM  
check the lil wiring harness that goes between the module and the coil,one of my friends car just quit, and kinda popped a lil goin down the straight and that lil harness had a loose connection..

crc1124
Dirt Maniac

Total posts: 143
posted April 25, 2005 06:46 PM  
You might want to check your fuel filter too.

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted April 26, 2005 03:34 PM  
I had the same thing with a holley 750 on a 406. It cut out and stalled right at 3500. While I was chasing electrical gremlins, it was sucking air through a bad carb. Long story short - I burned a piston and trashed a motor.

Don't be like me, be sure your chasing the right rabbit trail.

smallrock98
Dirt Forum Racer

Total posts: 100
posted April 26, 2005 05:05 PM  
I definately agree about checking on the loose toggle wire and changing fuel filter. If that doesnt work, check for loose valve lash. Hopefully you havent ate up the cam lobes. Good luck.

bubba0six
Dirt Maniac

Total posts: 146
posted April 26, 2005 07:45 PM  
i havent found anything yet no loose wires or bad connections that i see. it runs fine in the yard (not under load) it revs fine to 6000 --- hmmmmm????????? new fuel filter and it looks fine - real clean

[This message has been edited by bubba0six (edited April 26, 2005).]

rustyracer
Dirt Roller

Total posts: 7
posted April 26, 2005 09:57 PM  
Ive had and seen this happen many of times and most of the time it ends up being a small piece stock in the carb. Silicone, old gasket or seal and if the fuel cell is old fuel cell foam breaks down and some how makes its way to the carb.

DirtMirt
Dirt Roller

Total posts: 20
posted April 27, 2005 05:56 AM  
Could be cracked plug wires or if the wires are by headers, they could be arcing. start the engine in the dark and see if your see any blue lights. You will not have any problems until under load.

smallrock98
Dirt Forum Racer

Total posts: 100
posted April 27, 2005 05:58 AM  
Also to add what rustyracer said about the carb, you also might want to check your powervalve. It may have gone bad and could also be the culprit.

Raceman17
Dirt Maniac

Total posts: 165
posted April 27, 2005 06:42 AM  
You can get the module checked at Autozone for free. That will eliminate another thing off the list. Just a thought.
Later

quote:
Originally posted by bubba0six:
i havent found anything yet no loose wires or bad connections that i see. it runs fine in the yard (not under load) it revs fine to 6000 --- hmmmmm????????? new fuel filter and it looks fine - real clean

[This message has been edited by bubba0six (edited April 26, 2005).]



Speedracer92
Dirt Full Roller

Total posts: 70
posted April 27, 2005 01:44 PM  
This might sound weird but I had the exact same type of thing happen to me one night last season. I had a leaky valve cover gasket on the right side and oil got down on the starter. Somehow oil must have found it's way into the solenoid or something and shorted something out. I changed the starter and it worked fine. My best guess is it shorted out and was backfeeding through the ignition/starter button panel.

Donnie Ross
Dirt Freak

Total posts: 264
posted April 27, 2005 01:54 PM  
do you run an alternator? a low battery will cause this problem.since it ran fine earlier this could easily be it.

bigcityracer
Dirt Freak

Total posts: 431
posted April 27, 2005 06:40 PM  
Try disconnecting the tach for a night. Aslo check timing! And timing chain didn't jump a tooth.

bubba0six
Dirt Maniac

Total posts: 146
posted April 28, 2005 03:16 PM  
no alternator, and batt is fully charged. i will unplug the tach and try that the bad part is i dont know what to change everything seems to be fine and we dont have practice until an hour before race time and i dont have anywhere to test it under load.

Steve Dupree
Dirt Freak

Total posts: 316
posted April 28, 2005 04:26 PM  
Ok bubba lets try one more thing that it could be and probally is. It is vapor locking if you have a rubber hose from fuel pump to carb try getting a tube on it like factory and maybe put a few close pins on it if it still happens. Sense it does it only when you have run a little i am sure this is the problem, that or the fuel pump doesnt have the preasure but i will bet on vapor lock . Weak fuel pump can cause that too.........

Donnie Ross
Dirt Freak

Total posts: 264
posted April 28, 2005 04:26 PM  
check the wiring to module and the coil for loose crimps on the connectors had this once drove me nuts trying to find it,also you can check the module with a dwell meter hook it up at the tach terminal the dwell should increase with rpm if it is a good one.

beachracing
Dirt Forum Racer

Total posts: 94
posted April 28, 2005 05:30 PM  
could it be #5, and #7 cylinders cross firing? Something you might also check is fuel line located near radiator hoses. Usually if it only acts up during a long race, then it probably is heat related, hence fuel getting warm, and causing vapor lock. Fuel filter might also be clogged, or fuel pump going bad.

mike33x
Dirt Newbie

Total posts: 4
posted April 28, 2005 05:34 PM  
I had a similiar problem with a holley 2bbl carb last year, ended up being the fuel line breaking up and getting caught in the needle and seat. Ran fine till I put the load to it. Hope you don't fight your problem as long as I did.

-mike

bubba0six
Dirt Maniac

Total posts: 146
posted April 28, 2005 05:37 PM  
it was atleast an hour after i ran the heat race the car had cooled down already and it happened on the first lap of the main event.

crc1124
Dirt Maniac

Total posts: 143
posted April 28, 2005 06:06 PM  
I think it sounds more fuel related than electrical, but like everone else JMO.I had my fuel cell foam come apart last year and I had problems just like your stating. I had a bunch of sand like particles up inside the carb. I borrowed a friends carb and put a new filter in and worked like a charm. I would check the air filter and the butterflies as well. Make sure the carb is opening up and the squirters are working.

southern4020
Dirt Roller

Total posts: 7
posted April 28, 2005 06:11 PM  
Make sure your fuel cell is venting good. We had mud get in our vent one nite and it did the same thing.

The Flash32
Dirt Maniac

Total posts: 120
posted April 28, 2005 06:31 PM  
Sounds like fuel problem to me too. What kind of fuel fittings are you using? We always use the good barb type fittings that need no clamps with good 1/2" hose. Last year we had the same problem & after 2 weeks of changing things, it was sucking air at the fuel cell fitting. We put clamps on every fitting since & no more problems! Just a thought.

bubba0six
Dirt Maniac

Total posts: 146
posted April 28, 2005 06:49 PM  
i have 1/2" hose with the push lock fittings with clamps on them like you stated the only thing i havent done is pull apart the carb. i guess i will try that tomorrow.

southern4020
Dirt Roller

Total posts: 7
posted April 28, 2005 07:13 PM  
When you pull the carb apart be sure to blow the air bleeds out good and use a holley kit not a cheep kit

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 29, 2005 07:26 PM  
Bubba dont feel bad our first race this season our motor went flat at about 3500. We replaced the cap, rotor, and wires, the plugs, MSD box, disconnected the tach, checked the carb and fuel system and the battery and grounds. We went out for the feature and it did the same thing. We got it home the next day and pulled it out of the trailer and it was running fine. (ours did it with or without load it did not matter) The plugs looked good in one and two, three and four were a little rich, five and six were really rich and seven and eight were uel fouled bad. We thought it might have been water as it was a very humid foggy night so we wet the motor down with a water hose and it never did it again. We have run three races now and it is running good. We never found a reason for the problem.

race it
Dirt Full Roller

Total posts: 36
posted April 29, 2005 07:44 PM  
check distribitor weights. samething happened to me last week in hot laps. one of the weights moved up and it was not advancing the timeing right.

Stevei2i0
Dirt Full Roller

Total posts: 54
posted April 30, 2005 10:14 AM  
Sounds like the exact thing I had happen last week, after I installed a new engine. Ran fine till it started to warm up a little, then...ba baaa ba ba baaa... Turns out When installing the new engine, I had run the fuel line, from the pump to the carb hard against the bottom radiator hose. This was causing a vapor lock, as the engine temp increased. Rerouted the fuel line, and the problem went away. Now turns 6000 easy.

ssracer70
Dirt Newbie

Total posts: 3
posted April 30, 2005 03:24 PM  
be sure and check your distribitor gear so that its not worn or a sheared pin

regal 22
Dirt Full Roller

Total posts: 28
posted May 01, 2005 06:20 AM  
I had the same problem last year on a Q-jet.
Cleaned the carb problem went away, gook luck.

bubba0six
Dirt Maniac

Total posts: 146
posted May 01, 2005 08:03 AM  
well the races were rained out lastnight. didnt even get to the track. i guess ill let you know something next week.

bobaluuu
Dirt Freak

Total posts: 474
posted May 01, 2005 08:46 PM  
[QUOTE]Originally posted by Raceman17:
[B]You can get the module checked at Autozone for free. That will eliminate another thing off the list. Just a thought.
---------------------------------------------
we've had several customers come to us with those autozone scan list or sensor/module test and we've had to replace the same parts they say are good test are only as good as the tester.
sometimes replacing with a " known good part" is the only real world test.

bubba0six
Dirt Maniac

Total posts: 146
posted May 08, 2005 12:24 AM  
ok fellas heres how it went i rebuilt the carb, installed new fuel pump, new cap, rotor button, module, and coil all wires checked fine (plug wires and electrical wiring, switches and gauges) checked fuel lines and replaced some of them. went out for heat race... same thing motor still skiped bad. came in and changed carb with a known good one went out for the main, same thing still skiped bad. after about 5 laps came back in and just for S H I T S and giggles pulled the breather off and went back out she ran like a scalded A S S E D ape just like she used to. problem solved!! about 4 weeks ago i went to advanced auto to buy a breather and all they had was an 8 inch chrome breather 2 inches tall so thats what i bought and that was my problem it was starving for air. i will have a 14 inch 4 inches tall on it from now on. thanks guys for all your help and remember when it comes to breathers bigger is better!!!!!!

[This message has been edited by bubba0six (edited May 08, 2005).]

smallrock98
Dirt Forum Racer

Total posts: 100
posted May 08, 2005 12:37 AM  
You mean air filter, right? Sounds strange that was the cause of the problem. hmmm, must have been really clogged up.

[This message has been edited by smallrock98 (edited May 08, 2005).]

bubba0six
Dirt Maniac

Total posts: 146
posted May 08, 2005 06:53 AM  
you put one on your car and you will see. 8 inches in diameter 2 inches tall, on a holley 750 with the choke horn still on the carb. it looks clean but it is dirty enough to starve the engine.

big9r
Dirt Roller

Total posts: 8
posted May 08, 2005 08:33 PM  
check your carb pump and filter I had a problem with a power valve it cut out at about 3500rpm would not go over that leaned out and burnt a piston!!!

bubba0six
Dirt Maniac

Total posts: 146
posted May 09, 2005 03:19 PM  
i rebuilt the carb and tried a diffrent one that a buddy took off of his car because he couldnt make the main the only thing that would make it run like it was supposed to was taking the breather off.

97dirt
Dirt Forum Racer

Total posts: 94
posted May 09, 2005 05:28 PM  
Believe it or not,I bought 3 cams for the same reason,had the small air filter,an the motor had a really bad bog coming out of the corner,one night the breather came loose an she ran like the wind,so I changed breathers that night an lapped 5th place car!From then on nothing but 14 by 4in for me

    

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