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| Rough running engine https://slantsix.org/forum/viewtopic.php?t=27117 |
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| Author: | Russ [ Sun Feb 10, 2008 6:39 pm ] |
| Post subject: | Rough running engine |
Hello, Any thought on a car thats running rough? This car has been parked for about 4 or 5 months and recently got pertronix instead of points, new plugs , cap and rotor, wires , and changed one vacuum hose. insidently the belden wires that were installed in place of the standard wires that were on the car just didnt fit that well. The terminal ends clicked on alright, however the boots fit sloppy. Oh I also put on a new fuel filter too. PCV checked ok so was not replaced. Carb was rebuilt about two years ago , timing light has not been on the car yet since other parts went on. Thanks for any thoughts |
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| Author: | SlantSixDan [ Sun Feb 10, 2008 6:52 pm ] |
| Post subject: | |
Could be vacuum leaks, misadjusted valves, burnt valves, stuck valves, bad gasoline, ignition problems, ignition timing problems, cam timing problems, carburetion problems, choke problems, vacuum connection problems...need more info on how/when it's running rough. Is it a random misfire, or a rhythmic (specific-cylinder) misfire? Cold or hot? Idling, under load, both? |
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| Author: | Russ [ Mon Feb 11, 2008 6:12 pm ] |
| Post subject: | |
Dan i guess this was a loaded question and too vague. The valves were adjusted maybe 5 k ago. the engine is running rough when started , yes it appears to be a rythmic miss, but smoothes out as the engine warms up. I expected with the changes listed that the car would run smoother, however i have not put the timing light to it yet. |
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| Author: | SlantSixDan [ Mon Feb 11, 2008 7:26 pm ] |
| Post subject: | |
Try listening at the tailpipe when the engine is missing. See here . Based on your description, unless there are other symptoms (smoke?) you're not telling us about, I'm going to suggest looking for a single-cylinder vacuum leak. You don't, by chance, have the PCV hose routed to the vacuum takeoff on the rearmost intake runner, do you? It's fairly easy to detect which cylinder(s) have a persistent misfire: with the engine running roughly, remove one spark plug wire from its plug. If the engine gets rougher, it means an additional cylinder is now misfiring; replace that plug wire and remove the next one. When you remove the wire(s) that don't affect (or minimally affect) how the engine runs, you've found the misfiring cylinder(s). |
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