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| Thread ID: 92055 | 2008-07-27 05:41:00 | Misfire and Die | password (5384) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 692715 | 2008-07-27 11:47:00 | Well whilst ignition timing issues of some type might produce your symptoms it still sounds like a fuel related problem caused by fuel starvation. When the fuel into the cylinder gets really lean due to the level of fuel in the float bowel getting low it causes the fuel to burn at a slower rate so that it is still burning when the exhaust valve opens hence the bang or as I suspect you are describing, back firing! This could be caused by rust entering the fuel pipe from the tank blocking of the fuel flow or perhaps by an excessive amount of water being in the tank. A small amount wouldn't normally cause any problems as it is drawn into the engine along with the fuel but a large amount in the tank will eventually get drawn into the system when the tank is low causing fuel starvation. But as you indicate that fuel flow decreased when the pump was disconnected at the pump then that certainly sounds like fuel starvation from either a blocked pipe/filter, a blocked off vent in the fuel cap (not so likely but not unknown) or faulty pump. |
Robinz (9362) | ||
| 692716 | 2008-07-27 13:01:00 | Check the distributor points havent closed up, or are worn out (the heel wears away on the dizzie cam, and the points erode), the gap should be .015" (or .38mm or thereabouts), put a tiny bit of grease on the cam; check the cap center brush hasnt fallen out, the cap and rotor arent tracking HT voltage; check the leads for continuity (on the 20 kilo-ohms range (usually read between 2-15 k-ohms); check your fuel pressure (1-3 psi, not absolutely necessary, this), and flow (should be half a litre per minute and continuous), also check fuel quality (no water/rust/dirt) in the container you tested into; check your plugs arent worn out; the Marina has SU carb/s, check the fuel bowl isnt full of dirt or water or corrosion (quite common, blocks the outlet), also check the choke is coming on/shutting off (acts on the jet tube underneath) and the piston in the carb is free to move top to bottom of its stroke. Another possibility could be a intermittantly blocked exhaust system; cooling system ok? (and isnt leaking water onto the ignition system, seen that happen often ;)) |
feersumendjinn (64) | ||
| 692717 | 2008-07-27 19:30:00 | I had a V8 Holden at one time and had similar problems. Problem was traced to the float in carburettor which had a small hole in it and it cut the engine due to fuel entering the float. |
Sweep (90) | ||
| 692718 | 2008-07-27 20:53:00 | Those Marinas are good for back firing. Get to speed, about 80k, turn ignition off, put gas pedal to the floor, after about 20 secs turn on ignition. Kboom. :) |
Trev (427) | ||
| 692719 | 2008-07-28 00:07:00 | Check for water in the petrol. If it is then with old cars you can often cure it by banging the throttle wide open when the misfire etc starts. I did a trip across the country and back again with this problem and managed to keep going. The garage responsible accepted the blame - cleaned my tank and filled me up with fresh. They reckoned some motorists with later model cars only got a few hundred yards before stopping. I also reckon your valves need checking. Tom |
Thomas01 (317) | ||
| 692720 | 2008-07-28 07:02:00 | Look for simple things first. "remove the petrol cap" looks like a good first step. Water in the petrol might be a starter too, but usually that's a real problem, so I'd doubt it. What about a lying petrol gauge? Perhaps "1/4" means "very nearly empty". |
Graham L (2) | ||
| 692721 | 2008-07-29 00:41:00 | Yeah I'd be questioning the fuel gauge, if it seems to be OK when the tank is more full. | wratterus (105) | ||
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