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Old 06-17-2013, 04:14 PM   #1
BiggSixx1970
Registered User
 
Join Date: Mar 2012
Location: Lawrence, Kansas
Posts: 78
diagnosing this fuel/spark issue

Seems like the past couple weeks I've been on here a lot lately! My 1970 c20 is being very temperamental this summer.

I finally whipped my issues with my cooling system after flushing it out and replacing everything from the coolant to a water pump to an upgraded radiator.

Some time along that way, my engine picked up a little hiccup that I think has something to do with fuel but idk.

It runs fine, if not just a tad rougher now, but you have to keep your foot on the gas pedal. Accelerating it seems to run good while climbing, letting off it pops a little more than normal (due to a leaky manifold gasket, this hasn't presented itsself as an issue, pretty much every 250 I6 has an exhaust leak) and when I put in the clutch, or shift into neutral, it dies.

It got a major tune up last summer: Fuel pump, carb rebuild kit, new distributor, cap, plug wires, plugs, fuel filter, along with other misc minor misc hoses/gaskets, air filter, coil

This spring I gave it another with: Plugs, distributor cap, new radiator, water pump, cooling system flush, and another air filter

Everything in my ignition system should be up to snuff, correct? and my carb rebuild/coil/plug wires/distributor/fuel pump are only a year old.

Whenever I let off the gas in neutral, or push in the clutch it dies.

I did notice after driving it around after I replaced my cooling system, that it smelled kind of rich. Could this be a carb air/fuel mixture problem? It's a rochester monojet, there are just 2 screws i think. Messing with that carb is something I know nothing about. I have always been told if it's running, and running good (which it has up until recently) to leave them alone

Thanks for your input! You all are a big help
__________________
1970 C20, SM465, Eaton Ho52, HD coils, NO PB/PS/AC, 250 I6, Wood bed. All original minus a tune up!

http://67-72chevytrucks.com/vboard/s...d.php?t=545486

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