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Rough Running '88 Prostar
I need some help! My 351 Ford was running great until I changed the spark plugs-put in same Autolite 24. Now it's hard to start, runs rough, and won't idle(dies). I pulled each spark plug wire individually to see if one plug was bad/cracked. The back two on each side don't seem to make a difference! If I pull the vacum line off the carb, the RPM's go up and it seems to run better. If I remove the flame arrestor and look down the Holley 4160, I see gas streaming into the back of the carb. What's going on- I'm driving myself nuts!
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How do I check the firing order? I checked the resistance on 2 plug wires and they both said about 675 ohms. Is that OK or too high?
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Looked it up and I do have the correct firing order. I'm not sure how to check the wires.
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Just ensure that they are seated properly on the plugs and the distributor cap.
If the boat was running fine before you replaced the plugs and.... the plug wires are in the proper firing order.... then maybe one of the plug wires is not seated properly |
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I pulled each plug wire one at a time as the engine was running. Pulling 1,2,5,6 made a difference. Pulling 3,4,7,8 didn't make a difference in performance. I checked the resistance of the wires, 1:717 ohms 5:579
6:578 2:677 3:893 7:767 4:880 8:761 The coil to cap wire was 193 ohms. Are these values OK or not? What am I missing? |
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Did you change your wires one at at time, if so you didn't mix anything up. |
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I'm running it in the driveway hooked up to a hose. yes, it runs better at 2K than 800RPM. I wouldn't call it black smoke, but it smells heavily of gas.
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