68F100 Note Log
1968 Ford F-100
Property of F100Truk.
Added Aug 11 2017
Showing all notes
Dec 22 2017
I guess it's not the temperature that causes the single misfire, but dampness. The other day when it missed, it rained at night so it must've been damp and the last couple of days the truck didn't miss at all even though it has been colder (but dry).
Added by F100Truk on Dec 22 2017 at 6:30 pm
Dec 20 2017
After several weeks of dry warmer than normal weather with no misfires, the temperature suddenly dropped today and truck missed twice on the way to the gym after I started it first time in the day. The weather although cold it's still dry, so humidity has nothing to do with it apparently. I'm beginning to wonder if the spark plugs I have in are too cold. Maybe I'll try to install the NGKs again and see if it makes a difference, since I still have them.
Added by F100Truk on Dec 20 2017 at 7:54 pm
Dec 9 2017
It's been very dry for the last week or so and I noticed the truck runs remarkably better when there is low humidity. Even in the mornings, even though it's cold it hasn't missed like it usually does before the engine reaches operating temperature.
Added by F100Truk on Dec 9 2017 at 7:07 pm
Nov 26 2017
Cool weather damp and foggy. This morning I drove car to the airport to drop off Julia and back with no issues whatsoever. Then I parked it back at the house for about 1 1/2 hours and when I drove it again to come to the gym I felt the usual single stumble when the engine was back at being cool. I guess that is one thing I’m gonna have to learn to live with.
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75,650
Added by F100Truk on Nov 26 2017 at 12:23 pm
Nov 25 2017
Same vapor lock issue that happened two days ago happened again today, under exactly the same circumstances. I parked at Lorraine's house for a few minutes during warm weather, then drove the same route and experienced the vapor lock in exactly the same spot as I did two days ago. The only difference is that today is about 5 - 6 degrees cooler, but still warm. The other thing, is that the traffic light right before the left turn up the street where the truck stumbles, is very long which probably contributes further to the problem as I read vapor lock happens mainly in stop and go traffic on very warm days.
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75,613
Added by F100Truk on Nov 25 2017 at 4:30 pm
Nov 23 2017
Over 90 degrees for Thanksgiving. I had parked the truck facing downhills at Lorraine’s house for just a few minutes and experienced vapor lock brief loss of power on uphill acceleration followed by strong smell of gas vapor after. Cleared itself out.
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75,559
Added by F100Truk on Nov 23 2017 at 4:25 pm
Nov 14 2017
Felt a little sputter shortly after starting to drive the first time in the day, so the coil was not the issue. Bought a replacement fuel cap as the old one was leaking. Who knows, this might be the cause as when the truck sputters almost feels like it's burning a small water deposit, which could be caused by condensation building up in the tank due to the leaky fuel cap.
Added by F100Truk on Nov 15 2017 at 10:42 am
Nov 13 2017
Since I had one laying around I put the Petronix coil back in the truck to see if it fixes the misfire issue when cold.
Added by F100Truk on Nov 13 2017 at 2:37 pm
Nov 12 2017
Felt small miss couple of minutes after I started truck after being parked at gym for 1 1/2 hrs. Overcast cool weather.
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75,416
Added by F100Truk on Nov 12 2017 at 4:20 pm
Nov 11 2017
I got a $289 quote from Pacific Match Paint to do a spot blend on the scratches caused by the windshield wiper arms. I might just go ahead and get it done, also to check out the work this place can do. It would be nice to have a body shop that can do work to repair dings and scratches.
Added by F100Truk on Nov 11 2017 at 11:25 am
Nov 10 2017
Removed all the spark plugs to check them and make sure they are all correctly tightened. Made sure all terminal contacts are nice and snug on both sides (spark plug and distributor side) applied new dielectric grease. Changed the wire from the coil to the distributor as it was a little short and could've been the cause of a bad connection. I also bought new clamps and put them on the hose from the PCV to the crankcase. The spark plugs all looked very nice and clean with very minimal residue, which is always a good sign.
Added by F100Truk on Nov 11 2017 at 11:23 am
While driving to Maaco I felt a little hiccup again. I really thought that tightening the distributor vacuum advance nipple would have fixed the issue, but either it came loose again, or I'm now wondering if perhaps one of the spark plugs is loose. The misfire only happens after the engine has been started up after being off for some time, so it's definitely something that once the engine warms up goes away, so a loose spark plug is a possibility.
Added by F100Truk on Nov 10 2017 at 12:13 am
Changed windshield wiper arms, I was able to do it without scratching the paint using the tool to remove them, but I set them too low and when I tested them both sides nicked the paint off the cowling on both sides. Neat... Put touch up paint on the scratches, with the wiper arms on it's not that noticeable. I went to Maaco to get an estimate to fix the damage as well as repainting the inside door panels which have been chipping for sometime and they quoted me about $800. Id' be okay with paying that much, but I'm concerned the paint will not match, so I will have to think about this...
Added by F100Truk on Nov 10 2017 at 12:10 am
Nov 7 2017
So today before I even ran the engine for the day, I tightened the valve cover bolts just a little more as they needed a little more. Then I discovered that the brass nipple into the carburetor that controls the vacuum advance was quite loose. I took it out, cleaned the threads and re-seated it in the carburetor. There's a rubber grommet inside the fitting to seal it and might not be compatible with the nipple itself as it sticks out a little too much for a perfect fit. Nevertheless I tightened the nipple back in to make sure it seals correctly. I did not use white Teflon tape to seal as I'd rather do without it, so I will need to keep an eye on it. Regardless, this definitely could have an impact on the cold engine misfire. It probably caused a vacuum leak that was more noticeable on acceleration as vacuum increases under that condition. The leak probably caused a lean condition in the carburetor AND an incorrect advance setting until such time the carburetor heated up, expanding and sealing the nipple which explains why the misfire would only happen when the carburetor was cold. We will see, but I feel very optimistic. The only thing that could create a problem is the incorrect nipple length for the rubber grommet. I also checked the ignition timing and it is correctly set at 6 BTD.
Added by F100Truk on Nov 7 2017 at 1:23 pm
Nov 6 2017
Felt a little hiccup after 3-5 minutes of the engine being started on a cooler day.
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75,316
Added by F100Truk on Nov 6 2017 at 3:56 pm
Nov 3 2017
Early this morning when it was still cool I tightened all of the valve cover gasket bolts which were quite loose, maybe that is what causes the lean misfire? It definitely goes away after the engine reaches operating temps. We shall see...
Added by F100Truk on Nov 3 2017 at 2:44 pm
Nov 2 2017
Today is cool and rainy weather and once again I felt a little spit after pushing the choke all the way in. It appears it does it only once when the weather is cool and moist and then it goes away. Almost like the truck needs to clear whatever is in the fuel lines. Maybe just something that’s normal cool weather behavior?
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75,255
Added by F100Truk on Nov 2 2017 at 3:42 pm
Oct 30 2017
On the way to the gym I felt a small hiccup on light acceleration going up a small hill. The weather today is overcast and almost misty and the truck displayed the behavior after being started the first time of the day, maybe 5-7 minutes into the drive, maybe it's overnight condensation in the carburetor that gets burnt. I'll monitor.
Added by F100Truk on Oct 30 2017 at 7:20 pm
Oct 26 2017
Got a response from Pertronix. They seem to think the pop sound might be a grounding issue and suggested running a ground wire from the Ignitor unit to the negative battery cable. Instead of doing that I took apart the inside of the distributor, sanded all contact areas to make sure there was good ground, also removed the distributor shaft hold down clamp and sanded it down as well as the contact areas to the engine block. Finally I also removed the end of the negative cable to the engine block and sanded that down as well. The distributor shaft old down clamp was pretty oxidized. We will see...
Added by F100Truk on Oct 27 2017 at 1:56 pm
Oct 24 2017
Today when I got back to the truck after working out, once I turn the ignition key to the on position, before even cranking the engine I heard a muffled pop coming out of the distributor. Today the weather was very hot with a high of 107 degrees in Aliso Viejo and the truck had been parked in full sun for about 1 1/2 hours. This finally confirms the sound is coming from the Pertronix since I hadn't even cranked the engine over. My guess is that in high heat the battery has lower cranking amps and somehow creates the pop sound, which is consistent with when the battery was bad and it used to do it all the time. I will send an email to the Pertronix Technical team to see if they have any ideas. Also, no misfires at all in the last couple of days.
Added by F100Truk on Oct 24 2017 at 7:01 pm
Oct 20 2017
While driving just now I felt a very minor miss almost imperceptible didn’t feel like an ignition issue and it was on light acceleration. Might have been something in the gas possibly. I’ll keep an eye on it, but didn’t seem like much. I noticed the last two misses both happened in cooler damp weather (was drizzling today and much cooler), so I made the fuel mixture richer and dropped the idle to prevent run-on.
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75,153
Added by F100Truk on Oct 20 2017 at 4:19 pm
Oct 16 2017
Bought a new clutch release spring from LMC Truck. The one in the truck looks rusted and I'd think it's only a matter of time since it breaks. This is the spring in the engine compartment.
Added by F100Truk on Oct 16 2017 at 2:21 pm
Found the wrench and tightened the oil filter.
Added by F100Truk on Oct 16 2017 at 1:53 pm
Crawled under the truck and tightened a few of the oil pan bolts that had a drop of oil on them. I also saw a drop of oil from the bottom side of the oil filter, not much. It probably just needs to be tightened a little, but I don't have an oil filter wrench. Not a big deal. Other than that it looks good.
Added by F100Truk on Oct 16 2017 at 12:25 pm
Oct 14 2017
No misfires today. We are good. I noticed a drop of oil around two of the oil pan bolts. Nothing big, I'll tighten them when the engine is cold in the next few days. Other than that no oil drips.
Added by F100Truk on Oct 14 2017 at 7:38 pm
Oct 13 2017
No misfires today. Made fuel mixture a little richer and tightened hose clamps to PCV hose on the intake manifold side since they were a little loose.
Added by F100Truk on Oct 13 2017 at 7:14 pm
Oct 12 2017
In fact no more miss for the rest of the day. The one that happened this morning is definitely due to the carburetor being cold. Not a big deal because I can run the choke longer, but I wonder if it means I need to make the fuel mixture richer.
Added by F100Truk on Oct 12 2017 at 7:37 pm
This morning while driving around 7:30 am I felt a couple of sputters on light acceleration. This was just a few minutes after starting the engine for the first time in the day, so I think it's because the carburetor was still cold and I had already pushed the choke all the way in. It went away after that and did not miss anymore even if I tried it under load. So no problem, just like it happened as documented in the note on September 20th.
Added by F100Truk on Oct 12 2017 at 9:59 am
Oct 11 2017
Noticed a rock must have hit the front of the hood because a chip of paint was missing. I touched it up with the boxgreen touch-up paint.
Added by F100Truk on Oct 12 2017 at 10:05 am
Oct 4 2017
I was rearranging some of the wiring with a zip tie under the dash close to the ignition switch because it had gotten loose and when I turned the key to the start position I heard a single pop coming from the engine, but I hadn't even turned the engine over, just turned the key to the right. At first I thought I had shorted something out but the truck runs well and all lights and turn signals work as expected. I tried to replicate it again, but it wouldn't happen again.
Added by F100Truk on Oct 4 2017 at 8:06 pm
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