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FUEL OR SPARK

7

74X4Burb

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I got my 71 running realy good, until it grabs 3rd and I kick in the secondaries. then it just starts missing like theres no tomarrow this truck has always done this, no matter what carb I have on it what I set the timming at. it just starts running like crap when i open her up,it has a hesatation right off idle too but then again thats only if I lay into hard. is it fuel or my spark?.it has an edelbrock carb new fuel pump line & filter. origanal points distributor(new points),would changing that out for an HEI unit make a difference?thanks.Karl

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Zoloft Settlements
 
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"would changing that out for an HEI unit make a difference"

Most likely yes, and in a positive way. No more points !

You said that it did the same thing even after switching carbs. Based on that, check the vacuum advance module on the distributor, or just replace it...

DVal
 
I changed th dis. to a different points distributor with knew points but it dident change a thing.theres still a hesatation and the secondaries dont work. now what.this thing is driving me crazy.theres alot of potential in this ol horse I just dont know how to get it.Thanks.Karl

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HERBALAIRE VAPORIZER
 
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I got the truck back together dident change a thing switching vacum ports though. I did put that carb on my suburban and it ran like a top.Karl

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HEALTH STORE
 
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Ok. Since you changed the carb to another vehicle and it ran ok its probably not the problem. First thing I would do is take a look at the spark plugs to "read" them. Also what kind of condition are your plug and coil wires in? Is the carb vent being blocked from the lid being turned upside down or a aftermarket lid thats too close? Last thing could be a weak coil crappin out under load. hope this helps. Ed
 
My spark plugs are that nice light brown color.spark pug wires are new.put a new coil in but dident help.could it be a battery cable? I havent checked those latley. or maybe my transmission?.Thanks Karl

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Vermont Dispensaries
 
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[updated:LAST EDITED ON Jul-08-05 AT 08:45 PM (CST)]check your alternator and alternator belt, your alternator belt may be bad and start to slip when you get too much torque behind it.
 
[updated:LAST EDITED ON Jul-16-05 AT 02:15 AM (CST)]my friend had a truck that has the same problem, it was the PCV valve, he ripped out all that emissions crap and it runs beautifully now. :+ it only did it when he got to like 3 grand on the tach, then it would jerk like hell
 
>my friend had a truck that has the same problem, it was the
>PCV valve, he ripped out all that emissions crap and it runs
>beautifully now. :+ it only did it when he got to like 3
>grand on the tach, then it would jerk like hell





............Sorry meant EGR valve!
 
If the carb worked good when you tried it on a different engine & you have gone through all the other suggestions made it seems that perhaps the fuel pump pressure should be checked. If pressure drops below 2.0 psi you may need a pump with more capacity. That would explain why your truck has always had this problem no matter what carb is on it........
 
put HEI on it dident change nothin.should I go with smaller or bigger jets in the carb?.I have changed the fuel pump twice with no results.should I try a stronger alternator? how do I switch over to the new style alternator?.Thanks.Karl

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Vapolution Vaporizer
 
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Its your intake, its probably a single plane made for high rpm applications like a racecar, put an edelbrock torker II or Performer on it unless you already have one
 
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