Engine Trouble
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Engine Trouble
Well i just tried starting my F100 for the first time today, i just got done rebuilding the carb and this truck has been sitting for a while, its got a 302 engine in it and when i try starting it, it kinda trys to start but it floods and fire shoots out the carb and my dad says that if flames are shooting out of the carb you should be able to turn it over and it should suck the flames back into the carb but it dosent do that so if anyone had any ideas it would be nice.
Post Fiend
Joined: Nov 2000
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From: Glendale Arizona
Typically fire out the carb indicates a still open or burnt exhaust valve. The spark is igniting the cylender and backing up past the valve....OR your timing is way off.
It can also be indicative of a wiped cam.
Check your firing order timing from Number one TDC and also check your float as it seems to be dumping fuel from the rebuild.
Garbz
It can also be indicative of a wiped cam.
Check your firing order timing from Number one TDC and also check your float as it seems to be dumping fuel from the rebuild.
Garbz
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Yea i have checked the floats and they are fine is there any posible for the muffelers to be cloged or rusted so exhaust it cloged, it has been sitting outside for like 9 years and i just baught this truck and im trying to get it running.
Post Fiend
Joined: Nov 2000
Posts: 6,060
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From: Glendale Arizona
Nine Years... It may be a little more extensive than you thought..
Did tou have the intake off?
Sounds like a stuck lifter. It will hold open the exhaust valve. this area gets varnished fom oil deposits and after sitting moisture and what not infiltration due to just relative humidity in the air will rust them in the bores.
As for the carb flooding it has crap stuck in the float from the nine year old varnish still in the gas tank and lines.
A compound of issues
Garbz
Did tou have the intake off?
Sounds like a stuck lifter. It will hold open the exhaust valve. this area gets varnished fom oil deposits and after sitting moisture and what not infiltration due to just relative humidity in the air will rust them in the bores.
As for the carb flooding it has crap stuck in the float from the nine year old varnish still in the gas tank and lines.
A compound of issues
Garbz
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Yes i had the intake off, i put a diffrent one on there and i rebuilt the carb and the carb is like brand new, no varnish or anything in there so i might do a compresion test to make sure all the valves are fine.
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Can you turn over a motor by hand?
I was just woundering cause i cant even move mine at all. But it is not frozen up or any thing.
I was just woundering cause i cant even move mine at all. But it is not frozen up or any thing.
Last edited by IB Tim; Jun 19, 2007 at 05:17 AM.
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Originally Posted by PROSTOCK
...which means you had the distributor out.....I'd check that you have the timing right.
If you have backfiring and flame out the carb that means that valves are open when they normally shouldn't be...
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I just did a compresion test today and all of the cylenders are 120 execpt for one is like 96 so i dont know if that means anything or not, and i have not had the distributer out or anything but i am trying to get it timed but i need to get it started first.
Post Fiend
Joined: Nov 2000
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From: Glendale Arizona
Start back at basic engines 101.
Determine the year of your engine. Look on the intake for a ford part number like C8OE
D4OE ect.
Remove the spark plug wires and spark plugs.
Remove the passenger side valve cover.
Bring the number one cyl up to top dead center by rotating the crank clockwise.
(fords use the passenger bank as 1,2,3,4 and the drivers bank as 5,6,7,8)
As number one comes up place a finger over the spark plug hole and feel the compression go past. Keep the pistion comming up in the bore untill you see the harmonic blancer and timing pointer getting closer together. Once the pointer is directly on TDC or 0 stop. Bolth the intake and exhaust rockers should be closed.
Look at the distributer the rotor will now be pointing at NUMBER 1 CYL.
Start from this point and Reinstall the plug wires and spark plugs one at a time.
Ford uses a firing order of 1,5,4,2,6,3,7,8 on the 302. This is on early non roller 302
Some later mid eighties carb HOs and rollers use a 351 W firing order.
Garbz
Determine the year of your engine. Look on the intake for a ford part number like C8OE
D4OE ect.
Remove the spark plug wires and spark plugs.
Remove the passenger side valve cover.
Bring the number one cyl up to top dead center by rotating the crank clockwise.
(fords use the passenger bank as 1,2,3,4 and the drivers bank as 5,6,7,8)
As number one comes up place a finger over the spark plug hole and feel the compression go past. Keep the pistion comming up in the bore untill you see the harmonic blancer and timing pointer getting closer together. Once the pointer is directly on TDC or 0 stop. Bolth the intake and exhaust rockers should be closed.
Look at the distributer the rotor will now be pointing at NUMBER 1 CYL.
Start from this point and Reinstall the plug wires and spark plugs one at a time.
Ford uses a firing order of 1,5,4,2,6,3,7,8 on the 302. This is on early non roller 302
Some later mid eighties carb HOs and rollers use a 351 W firing order.
Garbz