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- Joined
- Jul 15, 2014
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- Location
- Edmonton, AB, Canada
- Vehicle Year
- 1994
- Make / Model
- Ford
- Engine Size
- 3.0L
- Transmission
- Automatic
Hey guys.
So I'm running my 347 fed with a quickfuel hr650 carb and it was running fine but rich. Because of the lift and duration on my camshaft, I put a 3.5 (down from 6.5) power valve in, also I forgot to mention my idle vacuum is about 7-8in. I also stepped down two steps of jets on the primaries and secondaries. (This is a mechanical secondaries carb) and if ran fine the first couple days. Then last night it started stumbling and the. I noticed when I dropped the hammer (about the throttle point when the secondaries should kick in) my afr went through the roof, over 17:1 and I lost power bad.
Ignition is all mad with mech advance dizzy, 6al box, and coil. Plugs are fairly new, gapped at 0.055, fue pressure was a steady 6-6.5 psi as required by the cab, oil pressure and temp were writhing spec.
I was also considering I got a bad tank of gas as I just filled up yesterday afternoon for a good night of cruising. Would a bad tank of gas cause a bad lean condition?
Before this happened, when I jetted down, I was running perfect between 13.5 and 15 all the time through my entire power band all the way up to 6500rpm.
Please throw some ideas my way as I'm racking my brain trying to figure this thing out.
So I'm running my 347 fed with a quickfuel hr650 carb and it was running fine but rich. Because of the lift and duration on my camshaft, I put a 3.5 (down from 6.5) power valve in, also I forgot to mention my idle vacuum is about 7-8in. I also stepped down two steps of jets on the primaries and secondaries. (This is a mechanical secondaries carb) and if ran fine the first couple days. Then last night it started stumbling and the. I noticed when I dropped the hammer (about the throttle point when the secondaries should kick in) my afr went through the roof, over 17:1 and I lost power bad.
Ignition is all mad with mech advance dizzy, 6al box, and coil. Plugs are fairly new, gapped at 0.055, fue pressure was a steady 6-6.5 psi as required by the cab, oil pressure and temp were writhing spec.
I was also considering I got a bad tank of gas as I just filled up yesterday afternoon for a good night of cruising. Would a bad tank of gas cause a bad lean condition?
Before this happened, when I jetted down, I was running perfect between 13.5 and 15 all the time through my entire power band all the way up to 6500rpm.
Please throw some ideas my way as I'm racking my brain trying to figure this thing out.
