RickB
Yoda
Offline
I filled with gas at the place I always do, only one with pure gas near here.
Drove 15 miles, stopped to buy dinner and then drove 4 miles home.
Running perfectly - that was Friday afternoon.
Left it until today, got in, started it and it was sounding like a helicopter.
Like 2 cylinders and sometimes 3 were firing.
Ok, so I pull plugs and look and two were pretty ugly like soot.
Cleaned and checked gap and reinsterted.
Still not running on all 4.
Pulled the cap, put on a new one I had sitting around.
No change.
Sooty black plugs.
Clean and repeat.
Put in new plugs also.
No change.
Starting to think this electrical problem might be fuel related.
Look over carbs, seem good.
Pull fuel line and run in a jar, good flow and I couldn't see water.
Still no good.
It has electronic ignition with the Crane (IIRC) XR700?
Also has a pair of HIF4's and the '74 exhaust.
All that has been running great for 14 months (installed carbs and exhaust last March)
Also a new Bosch blue coil installed a few months ago.
Only other work I've done over the past few months is replaced the brake hydraulics and the exhaust from the downpipe back.
What can cause plugs to foul horribly withing a couple minutes of running badly?
Black sooty looking plugs, I can take a picture if it helps.
I checked my vacuum lines and all seem good, really don't have many to check since installing the HIF4's.
No smog equipment on this engine since before I bought the car.
Distributor is tight and hasn't moved, I can check timing with a light to make sure.
This thing where it fires on one or two cylinders is strange.
No overheating, in fact it's been running cool with the temp gauge only coming up to maybe 1/3.
Drove 15 miles, stopped to buy dinner and then drove 4 miles home.
Running perfectly - that was Friday afternoon.
Left it until today, got in, started it and it was sounding like a helicopter.
Like 2 cylinders and sometimes 3 were firing.
Ok, so I pull plugs and look and two were pretty ugly like soot.
Cleaned and checked gap and reinsterted.
Still not running on all 4.
Pulled the cap, put on a new one I had sitting around.
No change.
Sooty black plugs.
Clean and repeat.
Put in new plugs also.
No change.
Starting to think this electrical problem might be fuel related.
Look over carbs, seem good.
Pull fuel line and run in a jar, good flow and I couldn't see water.
Still no good.
It has electronic ignition with the Crane (IIRC) XR700?
Also has a pair of HIF4's and the '74 exhaust.
All that has been running great for 14 months (installed carbs and exhaust last March)
Also a new Bosch blue coil installed a few months ago.
Only other work I've done over the past few months is replaced the brake hydraulics and the exhaust from the downpipe back.
What can cause plugs to foul horribly withing a couple minutes of running badly?
Black sooty looking plugs, I can take a picture if it helps.
I checked my vacuum lines and all seem good, really don't have many to check since installing the HIF4's.
No smog equipment on this engine since before I bought the car.
Distributor is tight and hasn't moved, I can check timing with a light to make sure.
This thing where it fires on one or two cylinders is strange.
No overheating, in fact it's been running cool with the temp gauge only coming up to maybe 1/3.