Visit The Dirt Forum for More Information

Author Topic:   Well here we go agian--suggestions please
Dirt Maniac

Total posts: 127
posted October 06, 2002 08:12 AM
Running a ford 347 engine and coming outta number 2 it popped ad cracked about 2 or three times and flame shot out the exhaust and it lost it's power.It still runs but if you let it set and idle after about 30 seconds it will pop real loud. The plugs on the right side look really black. haven't had a chance to pull the left bank yet.

any suggestions on where we should start and where all to look would be very much appreciated..

Thanks in advance Wheels

Dirt Freak

Total posts: 298
posted October 06, 2002 07:58 PM
check to see if the pin sheared in the distributor

Dirt Full Roller

Total posts: 47
posted October 07, 2002 10:35 AM
Sounds as if its definately related to spark timing, as Ford5 suggests. Don't know what type distributor you are using, but one time with a stock Ford dist. we had the splines strip on the top of the shaft that holds the mechanical advance unit. We were getting over 60 degrees total advance...not good on pistons.
Wheels, Tryed to send you a PM, but don't think it went through.

Dirt Maniac

Total posts: 127
posted October 07, 2002 04:29 PM
Thanks guys we're going over now to start checking some things. As i stated it will still start and run but will pop after about 30 seconds of running. Ford5 it wouldn't run would it of the pin was sheared??

4ord I will check my pm and see if it came through.

Thanks wheels

Dirt Maniac

Total posts: 127
posted October 07, 2002 04:34 PM
4ord the pm did not come through. My email is if want to email me--Thanks wheels

Dirt Maniac

Total posts: 127
posted October 07, 2002 09:05 PM
We are using msd ignition and msd distributor. We found a bad plug and replaced it(will replace with all new plugs tommorrow night) --pulled distributor--looks ok--but now we start it and it will pop real load on right bank and then the idle changes a bit. Tach seems to be erratic and not smooth like it was(meaning before we run saturday night it was smooth and now when we rev it up it jumps around like crazy. We found a wire that was partially loose and tightened it and still is popping.

Could the carb power valve be bad since it pooped(backfired) so hard.Would this cause it to continue to pop.

Oh yeah now we can rev it up and as soon as we let it back off car dies.

Did a compression test and all looks good there.

What can we do next---I'm lost.

Thanks in advance wheels

also I cleaned the ole plugs and after we started it and run for a little bit the plugs seem to carbon up quite a bit--real black-like it's real!!!

[This message has been edited by Wheels47 (edited October 07, 2002).]

Dirt Freak

Total posts: 408
posted October 08, 2002 06:30 AM
Yes, you possibly have a blown power valve (at least) in the carb. Anytime the motor backfires like that, your going to cause damage to the power valve if there is no blowout protection kit in the baseplate of the carb. You'll also find that if there is a brass float in the carb, it may be crushed or dented badly now, causing you to have a much higher than normal float level, which will also contribute to your overly rich condition.
At the very least, I'd recommend pulling the carb apart and going thru it.

Let us know what you find.

Hope that helps,
Kinetic Performance

Dirt Maniac

Total posts: 122
posted October 08, 2002 11:52 AM
Check you distributor pick-up coil ,mine was bad right out of the box and it was the last thing we checked cause it was new but it was the problem.

Dirt Freak

Total posts: 353
posted October 08, 2002 04:24 PM
Check your fuel.

Dirt Maniac

Total posts: 127
posted October 08, 2002 10:15 PM
Thanks for the post guys but we still need help.
Tonight we worked all night checking everything we knew to do.We put on another coil and then a different distributor--still the same. Now the car will start up run for a sec and die. Fires right off . after it dies we try to restart it and it won't fire at all.
We are ordering a new msd and coil tommorrow but in looking in the magazine we found that it was describing exactly what our motor done.

1. Was running great
2. Backfired through exhaust-throwing flames out the exhaust.
3. loss of power
4. erratic tach

it said to check the ground as we have ground problem. What do you think. could this be the culprit? I never heard of this happening but it must be a possibilty. Can't wait to get back to check it out tommorrow night.

Any suggestions is truely welcome we will try them all.

We are gonna go ahead and check the power valve kplugnut and tilly we are sure it's not the fuel as it just won't fire and keep running.

Thanks wheels

Ps I can't wait to hear it purring agian like before. We were in 1st with a huge lead on the #2 car in the feature when this happened and we have to get back to the track for our revenge--lol Love this racing!!!! wheels

[This message has been edited by Wheels47 (edited October 08, 2002).]

Dirt Maniac

Total posts: 122
posted October 09, 2002 01:07 AM
Timing chain?
Fuel pressure?
Valve Train?

Dirt Forum Champ
Total posts: 620
posted October 09, 2002 07:48 AM
wheels, it does sound like it could be a ground problem. be sure that you have a ground strap from the engine to the frame, even if you have solid mounts.

Dirt Maniac

Total posts: 127
posted October 09, 2002 09:28 PM
Compression ok
timing chain haven't checked yet
Fuel pressure none-won't start
Valve train ok

Checked the ground tonight and still nothing

thinking it must be in msd box--new one will tell if it is I hope.

Timing chain next if that don't fix it.

thanks guys

Dirt Full Roller

Total posts: 60
posted October 09, 2002 09:46 PM
This is what we found last night------we put a volt meter on msd box.....when we try to fire it we have a sudden rise in volts then goes to 0. It trys to fire once then nothing. Wheels "volunteered" to hold a screwdriver in coil wire and press against distributer. We get a quick light spark, then nothing. I checked all the grounds and cleaned ends, still nothing. I talked to my engine builder, he says it almost has to be ignition, not internal engine problems. I had a spare distributer that I know works and put it in with no change. Only thing left is msd, coil, and battery.........changing everyone tomorrow night!!!!!!

Dirt Freak

Total posts: 499
posted October 09, 2002 10:04 PM UIN: 23443678
This sounds like somthing that has happend to me and a buddy of mine. Do you have a blaster 2 coil? I have had one go out on me and so did a buddy. It started acting up first getting a poping like misfire...then ran a bit more then just went dead. The one was only 5 races old and the other about a season old.....since then i have only run blaster 3 coils and had no problems at all. People allways say a coil works or it doesnt well we both had them act up on us befor they went bad alltogether i changed the msd befor going to the coil that was only 5 races old wich cost us a main event. Hope you get it all fixed.......

Dirt Maniac

Total posts: 127
posted October 10, 2002 10:00 PM
Dirtracer14-- Yes it was a blaster 2 coil. My son bit the bullet and put a new msd and a new coil on tonight and we fired her right up. Running gr888888 now---yahooooooooo!!!

Not sure if it was the coil or the msd but we are ready to run--with just a few more things to do..

I would like to thank all the posts and help we had as we looked at all the replies and checked them all out. This forum is one of the best i've been on for ture help without any bashing. Most forums you go on is mostly bashing someone instead of trying to put true input to a fellow racers inquiries.

Thanks Dirt Forum.... Wheels

Dirt Maniac

Total posts: 106
posted October 14, 2002 12:44 PM
I see you got her fixed .I wanted to add something for future reference.I have seen others have problems with ignition switch loose connections or corroded causing missing and popping on the track.

Dirt Maniac

Total posts: 127
posted October 14, 2002 05:42 PM
Thanks dirtracer7--we may just have to replace that switch also just to make sure we have all the culprits that saddened us 2 weeks ago-- (got rained out this weekend)

thanks Wheels

Back to the Archives