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5/26/13 7:00pm - Original Message: 'Engine Miss???'
tinbender
Former Member
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edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
Here the list: changed plugs,wires,had timing reset,even replaced the fuel filter and air filter. So when I start the car it runs ok and starts off normal,but when I step on the gas(not hot rodding) to accelerate the car misses really bad....any ideas on what to check next?
                         Rick (This thing got me going batty)Confused
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5/26/13 9:25pm - Reply: 'Re: Engine Miss???'
danascar
Standard Member
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
Assuming you have HEI on the 75 that only leaves the distributor cap and rotor....changed those? 

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5/26/13 9:30pm - Reply: 'Re: Engine Miss???'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I was thinking to check the ignition module if its HEI.
 
Also, once I had a minor miss with the motor which was caused by an after market air filter cover interfering with the accelerator pump on the (Q-Jet) carb.
 
Some food for thought. Let us know what you find.
 
Kevin


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5/26/13 10:50pm - Reply: 'Re: Engine Miss???'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
IF it still has it, I would suspect the EGR valve....

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Joel Adams
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5/26/13 11:19pm - Reply: 'Re: Engine Miss???'
tinbender
Former Member
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edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
Well I will change the cap and rotor also the module ......it doesn't have a EGR valve on it,there is a factory looking cover where it goses. Rick

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5/27/13 9:20am - Reply: 'Re: Engine Miss???'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Take the rotor off, and flip it over. If you see anything that looks like lightning bolts, or any discoloration, the rotor is bad. The spark from the center contact of the coil will try to find the first ground it can, and in most cases, the closest ground is the two screws that hold the rotor on. So the spark will actually jump to the screws, instead of going down the plug wires to the plugs.
A cap and rotor will certainly help, but if you see the evidence of spark jumping on the bottom of the rotor, I would suggest you also change the coil while you're at it.


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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/3/13 12:28pm - Reply: 'Re: Engine Miss???'
dapperdan
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COLUMBUS, NC - USA

Vette(s):
2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed

Joined: 8/19/2012
Posts: 42
When you say that the car misses when you accelerate, do you mean the engine continues to run rough with the accelerator in a given position, or that the car "stumbles" when you step on it?  If it stumbles, then it is probably the carburetor that is the problem.  If is actually continues to miss at cruising speed, then it is another electrical problem that you haven't found yet.  I know of several fixes for the carburetor, if it is a stumbling problem.

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