engine misfires
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New User
Joined: Aug 2010
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engine misfires
I have a 1967, f600, grain truck with a 330 engine. Had a skip in the engine, did a tune up, also had to replace the complete distributor. Engine sounds like one or more of the plug wires are crossed, but checked at least 3 times and the fireing order is right on.
New plugs, new plug wires, new points, condenser, rotor and cap. used distributor.
From what I can tell, I'm also not 180 degrees out of time. Engine will start, just runs like plug wires are crossed.
Thanks to any and all for your help.
New plugs, new plug wires, new points, condenser, rotor and cap. used distributor.
From what I can tell, I'm also not 180 degrees out of time. Engine will start, just runs like plug wires are crossed.
Thanks to any and all for your help.
Elder User
Joined: Jan 2002
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Check these
A couple of things come to mind. First I would check to be sure that No. 1 sparkplug wire was in the correct place on the distributor, i.e. No. 1 cylinder is at top dead center on the compression stroke when rotor is pointing to that plug. 2nd, check the timing to be sure it is correct. Next I would take a good look at the inside of the replacement distributor, looking for skinned wire, loose plate, etc. If all that checks OK, I would start pulling plugs one at a time and check each one to be sure that is is firing. If you have already done all of this, repost and we will go from there.
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Thanks DavidB, #1 plug wire is in #1 spot on dist. cap. Checked my wire placement 3 times all around to make sure I had the fireing order right.
I will check all the plugs to see if they are all fireing, also going to run a coil check to make sure its good.
Have to borrow a compression tester, mine went walk-a-bout couple years ago.
Thanks very much for taking the time to help.
I will check all the plugs to see if they are all fireing, also going to run a coil check to make sure its good.
Have to borrow a compression tester, mine went walk-a-bout couple years ago.
Thanks very much for taking the time to help.
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New User
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compression check
Ran a compression check, got between 123 - 135 on all but #2 cyclinder, NO compression at all on #2.
Pulled valve cover to check for bent push rod or anything visibly wrong. didn't see anything. Got the head and exhaust bolts soaking in wd-40.
Does anyone know where I can get engine parts for this engine? Head gaskets, valves, rings, pistons???
And again, THANKS to any and all replies.
Pulled valve cover to check for bent push rod or anything visibly wrong. didn't see anything. Got the head and exhaust bolts soaking in wd-40.
Does anyone know where I can get engine parts for this engine? Head gaskets, valves, rings, pistons???
And again, THANKS to any and all replies.
Elder User
Joined: Jan 2002
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Sounds like a burned valve
If you cannot see any problems from above, you most likely have a burned valve on that cylinder. Any automotive machine shop should be able to repair the head for you. Depending on funds available, I would try to have both heads rebuilt if possible.
Posting Guru
Joined: Mar 2003
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skip
i haven't seen you mention the cap or rotor .see if you have carbon tracking on your cap. maybe a crack in your cap.if you don't know what carbon tracking is ge back to me.
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From: sw colorado
check the points too, burned or mis adjusted will make it miss. Sounds like the low compression is your problem, though.
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Elder User
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Misleading
The cap and rotor would not cause the compression readings he is getting. The compression readings he posted indicates that the head must come off for further investigation. It is almost certainly a burned valve.
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DavidB hit the nail on the head, burned exhaust valve on #2 cylinder. About as bad as I've ever seen, almost 3/4 inch burned off the seat.
I want to say THANKS to all who responded to my question, sure makes things easier when ya got more than one brain working on a problem.
I want to say THANKS to all who responded to my question, sure makes things easier when ya got more than one brain working on a problem.
