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Author
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Topic: i got a problem
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capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-22-2003 10:16 PM
   
this could end up being long! my car has started to backfire and spudder going down the track, sometimes. well most of the time. sometimes when i start my burnout or start to leave the line it will backfire and shut off. then it is hard to restart. it will turn and turn before it starts. i have checked everything i can think of. im sure im missing something simple. i have changed carbs to one that i know is ok. i found a short in the plug going to my dist (msd) and repaired it. the timing both mechanical and electrical seems ok. the car set up for a couple of weeks during a bunch of rain. my first thought was moister somewhere. inside of the dist is dry. the reluctor is a little rusty but i dont think that would cause this problem. i sanded it some anyway. it actually backfired and caught on fire a couple of times. i have changed the power valve just to be sure that wasnt the problem. any ideas will be greatly appreciated. thanks------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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kcode
Gearhead Posts: 2559
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 03-22-2003 11:03 PM
Mike,
Do you have constant fuel pressure and flow?Mike
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clevelandstyle
Gearhead Posts: 583
From: Connersville, IN
Registered: Jul 2001
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posted 03-22-2003 11:22 PM
Water in fuel?  ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V
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streetstang67
Gearhead Posts: 257
From: SC, USA
Registered: Nov 2002
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posted 03-22-2003 11:46 PM
Same thing happened to me...turns out my coil was going bad and sometimes it worked, but in a few seconds, it would flutter on and off, back fire and shut down. Change your coil, cheap fix
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steve'66
Gearhead Posts: 6150
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-23-2003 12:52 AM
Mike,Have you run it at night while looking under the hood. Sounds like the ignition is cross firing. If one plug can't fire the MSD is strong enough to fire the wrong plug instead. Check the plugs and wires.  SteveW
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capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-23-2003 07:12 PM
mike (k-code) i have 7-8 lbs of fuel pressure. it will fill a pint jar in 15 seconds just running the pump with the starter. so i guess that is about 1/2 gal per min. is that enough?cleveland style, i pumped about a quart into a clean jar and it was perfect. also checked filter, it is ok.
streetstang67, i will try another coil tomorrow.
steve, i am waiting for it to get dark enough right now. hell its dark enough now. be right back.
thanks guys
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mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-23-2003 07:26 PM
well no christmas tree. i moved and wiggled all the wires under the hood and found no leaks. is it possible that the timing chain jumped a notch? if it has, would there be a noticible difference in the rotor button placement when the engine is at top dead center? it looks like it is in the right spot. pointed at the corner of the carb. thanks------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
steve'66
Gearhead Posts: 6150
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-23-2003 07:53 PM
It's not the timing chain, that would make the rotor point to a new spot.How about loose grounds between the engine/frame/and MSD box?
It should be an electrical problem, since you're using a "known good" carb. SteveW
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capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-23-2003 08:18 PM
do you think the rusty wheel thing in the dist (cant think what to call it) could cause the prob? i want to take it out and clean it up but i cant figure out how to get the plate and weights out of the way. msd dist.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
Fastymz
Moderator Posts: 10683
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-23-2003 08:49 PM
"i got a problem"
PENICILLIN,will fix you right up Mike.Dont worry I wont tell any one.  ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Dave_C
Gearhead Posts: 724
From: Gadsden, Al
Registered: Aug 99
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posted 03-23-2003 08:56 PM
I wouldn't think a little rust on the reluctor wheel would hurt. After all, there is no contact with the pickup. It's just magnetic and there's an air gap. If you still want to remove it you have to take the shaft partially out, remove the dist and knock the roll pin out ot the collar between the dist body and gear. Leave the gear alone. The you can raise up the plate, weights, etc to get to to it.Have you put a timing light on it to verify timing? Try that first and then if it checks out I would check the MSD box. (instructions on how to test on the MSD site) Then start checking all the connections. Gremlins like this can be a pain to track down. Just check one thing at a time a rule them out. Later,
David Cole
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Moneymaker
Administrator Posts: 19611
From: Lyons, IL, USA
Registered: May 99
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posted 03-23-2003 09:25 PM
It's electrical!
Run new separate "hot" and ground wires for the MSD from the battery and check the feed wires to the coil Mike.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com [This message has been edited by Moneymaker (edited 03-23-2003).]
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capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-24-2003 11:59 AM
all those wires checked out ok, alex. i did check my timing and it was kinda low. at my staging rpm the timing had only advanced to about 15-20 degrees max. could this cause a back fire upon hard acceleration at this setting? thanks------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-24-2003 09:13 PM
ttt im getting desprate. gotta race this weekend.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
steve'66
Gearhead Posts: 6150
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-24-2003 09:37 PM
Retarded timing would cause backfiring out the exhaust. Firing the plugs too late while the exhaust valve was open. Lock your timing out at 35 and give it a try this weekend. SteveW
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kid vishus
Gearhead Posts: 4254
From: middle of NC
Registered: Oct 2000
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posted 03-24-2003 09:48 PM
Do you run an alternator?
MSD likes voltage. Whne I first started racing I didnt use an alternator and I found if my battery got too low, the car would miss on the line, or right off it, miss occassionaly while going down the track, and just do all kinds of "un normal" stuff. Whne I started running an alternator again, it stopped doing all that stuff.If you are already using one, I have no idea unless the MSD box is messed up.
IP: Logged |
capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-24-2003 10:31 PM
yup kv, i run an alt and always charge my batt fully before i go to the track.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
Moneymaker
Administrator Posts: 19611
From: Lyons, IL, USA
Registered: May 99
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posted 03-25-2003 12:19 AM
Is the distributor advance locked in?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
capri man
Gearhead Posts: 3138
From: doerun, ga.
Registered: Nov 2000
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posted 03-25-2003 07:55 AM
no alex, it is not locked in. i checked it and it seems to work fine. i raised it some yesterday and ut seems to run better. i took it out on the hiway and could not get it to backfire. i tried to simulate actual race launches. initial is about 15 and it has about 32 at 2800 rpm. if i go any higher it wants to stumble a little off of the line. what do you guys think? thanks------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
IP: Logged |
Moneymaker
Administrator Posts: 19611
From: Lyons, IL, USA
Registered: May 99
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posted 03-25-2003 10:24 AM
It should NOT stumble with HIGHER timing Mike.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
Fordwiser
Gearhead Posts: 210
From: Metamora, Illinois
Registered: Dec 2000
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posted 03-25-2003 05:56 PM
This may be a long shot, but does it still have the factory ignition switch in it? Try wiggling the key switch around with the car running and see if there are any dead spots. The actual switch is located down lower on the steering colum, sometimes old switches start to seperate and the contacts cant stay contacted anymore.
Roger
IP: Logged |
Buster
Gearhead Posts: 663
From: Orlando
Registered: May 2002
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posted 03-25-2003 07:53 PM
Look at the Stator and see if there are any cracks in it....
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