Struggling with white smoke and fuel smell (1968 F100)
#16
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 8,600
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Originally Posted by 13mm
the smoke video shows evaporation quickly like steam, oil burning smoke lingers and fades away slowly with a blue tint & smells oily. Water passage at intake manifold may seep into intake runner causing steam cloud smoke.
Vacuum gauge looks like the timing is retarded, advance the timing, slow idle down to get throttle plate/butterfly closed to adjust air bleed idle mixture screws, re check timing with timing light. repeat if necessary.
Just a few sugestions.
may you do well, good luck
Vacuum gauge looks like the timing is retarded, advance the timing, slow idle down to get throttle plate/butterfly closed to adjust air bleed idle mixture screws, re check timing with timing light. repeat if necessary.
Just a few sugestions.
may you do well, good luck
#17
Okay guys I have some updates for you. It snowed here pretty bad the past 2 days and its like 3 degrees out and my driveway is iced so I wasn't able to get the truck outside and started today, but I took some photos in my garage.
1. First of all I have a C4 Transmission not a C6. Some guy was helping me with my truck a while back swore it was a C6 so sure why not, but I looked at the pan today and it was 100% a C4 transmission pan. So I don't think that changes much, but I just wanted to let you know.
2. My oil is getting kind close to black after just 60 miles. I changed it about 2 months ago drove 60 miles and changed the spark plugs then too.
3. I am using Autolite 25 Copper spark plugs (I bought the same ones that the vehicle originally had in them). I can't find my gapper tool, but once I do I'll post what they are gapped at.
4. My Valve modulator is a push green stripe and it was bone dry inside the tube coming out of it so I am going to assume its not siphoning any transmission oil.
5. All the photos of my rockers, carb, trans, oil, etc. Last two pics are of the gauges I just finished putting in and my first time using vinyl, I think it came out alright.
1. First of all I have a C4 Transmission not a C6. Some guy was helping me with my truck a while back swore it was a C6 so sure why not, but I looked at the pan today and it was 100% a C4 transmission pan. So I don't think that changes much, but I just wanted to let you know.
2. My oil is getting kind close to black after just 60 miles. I changed it about 2 months ago drove 60 miles and changed the spark plugs then too.
3. I am using Autolite 25 Copper spark plugs (I bought the same ones that the vehicle originally had in them). I can't find my gapper tool, but once I do I'll post what they are gapped at.
4. My Valve modulator is a push green stripe and it was bone dry inside the tube coming out of it so I am going to assume its not siphoning any transmission oil.
5. All the photos of my rockers, carb, trans, oil, etc. Last two pics are of the gauges I just finished putting in and my first time using vinyl, I think it came out alright.
Spoiler
#18
#19
Just a question that might eliminate the carb. If you run your idle mixture screws all the way in does the engine still run? The reason I ask is that the power valve in an over the counter Holley is a 6.5. When you run a modified cam you have lower vacuum and it could require a lower value power valve like a 5.5 or even 4.5 to keep it from opening at idle causing a very rich idle mixture.
#20
That tranny output shaft looks awful rough (rusted/pitted), and the tranny seal looks dried and cracked. But on the good side the dash looks great! And the inside of the door is very nice. Is that the temp sensor on the manifold (below the dist.) the wire is missing whatever it goes to.
Just a question that might eliminate the carb. If you run your idle mixture screws all the way in does the engine still run? The reason I ask is that the power valve in an over the counter Holley is a 6.5. When you run a modified cam you have lower vacuum and it could require a lower value power valve like a 5.5 or even 4.5 to keep it from opening at idle causing a very rich idle mixture.
#21
#23
Most all Holley carbs I have ever wrenched on, has always had POWER Valve issues, a backfire can rupture the diaphram & then over fueling is sucked into manifold. Unburned fuel turns oil dark.
www . Holley . com has a good website to visit, technical & service info is good, some videos too.
Old holleys use to have a CORK jet plate to Body Gasket that deteriorated in no time, causing engine run issues, Hopefully your carb has the new style blue material gasket.
Sometimes Youtube have video that help showing how to get it fixed.
Internal carb circuits may be gummed up .
Good luck
www . Holley . com has a good website to visit, technical & service info is good, some videos too.
Old holleys use to have a CORK jet plate to Body Gasket that deteriorated in no time, causing engine run issues, Hopefully your carb has the new style blue material gasket.
Sometimes Youtube have video that help showing how to get it fixed.
Internal carb circuits may be gummed up .
Good luck
#26
Most all Holley carbs I have ever wrenched on, has always had POWER Valve issues, a backfire can rupture the diaphram & then over fueling is sucked into manifold. Unburned fuel turns oil dark.
www . Holley . com has a good website to visit, technical & service info is good, some videos too.
Old holleys use to have a CORK jet plate to Body Gasket that deteriorated in no time, causing engine run issues, Hopefully your carb has the new style blue material gasket.
Sometimes Youtube have video that help showing how to get it fixed.
Internal carb circuits may be gummed up .
Good luck
www . Holley . com has a good website to visit, technical & service info is good, some videos too.
Old holleys use to have a CORK jet plate to Body Gasket that deteriorated in no time, causing engine run issues, Hopefully your carb has the new style blue material gasket.
Sometimes Youtube have video that help showing how to get it fixed.
Internal carb circuits may be gummed up .
Good luck
#28
Honestly not much, it still bounces about +/- 5 in either direction. When I adjust the screws about 2 full turns or so it moves about 5 (still bouncing). I got my timing light yesterday, everything is just frozen here so I'm waiting for the temperature to come up a bit. Probably show you guys the timing results tomorrow and take off the carb and put the new 5.5 power valve in and the 121-31 squirters in as well.
#30
"Vacuum gauge looks like the timing is retarded, advance the timing, slow idle down to get throttle plate/butterfly closed to adjust air bleed idle mixture screws, re check timing with timing light. repeat if necessary. Just a few sugestions."