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Old 09-22-2015, 07:25 AM   #15
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I'd go with spark plugs. I replaced plugs on one of our cars, got Bosch platinum. It started developing a bad miss under load and in wet conditions. Turns out 3 out of the 8 plugs cracked with under 10k miles on them. Replaced with Ac Delco as my mechanic recommended and it solved the issue. Mechanic said Bosch and NGK are not what they used to be.

If that doesn't help, I'd try the coil. Had similar issues on a different vehicle. Replaced the coil, solved the problem and it started easier. Coils will start to break down over an extended time.

Those of you that said spark plugs seem to be close but not all the way.
I replaced 4 plugs at a campground all on the drivers side. I turned the rubber insulator to the right then the left with a tool they would not break from the porcelain. I did manage to pry off those 4 with a great deal of effort and replaced with 4 platinum plugs (Ac Delco) .
The next day the missing was a memory😀. The next morning we filled up from about a quarter tank with three cans of Heat and about 40 gal. of Shell gas , the missing started at once and lasted all day 😁 the plugs I had the room and strength to get out were tracing down the side looks like it to me , I will try to include a picture.Click image for larger version

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Thanks all
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Old 09-22-2015, 01:17 PM   #16
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From the looks of the plug you are burning lean...google spark plug images....then check timing and vac leaks
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Old 09-22-2015, 03:15 PM   #17
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I looked at this on my phone at first....looking on PC its hard to tell anything from this picture.

But new plugs...run fine for a while then gets miss....most likely not the plugs

Just curious did you set/check the gap on the plugs?

Also that plug only has 6K miles on it right?

If its easy to get to the coil, change it... you said you saw a faint light at idle...bad juice at high rpm means bad burn
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Old 09-23-2015, 11:55 AM   #18
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I agree, coil would be my next thing to try.
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Old 09-23-2015, 02:02 PM   #19
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If you have fuel injection I'm voting for a failing fuel pump.
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Old 09-24-2015, 09:28 AM   #20
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Even if it's a carburetor engine it could still be a fuel pump issue. There should be an electric booster pump close to the fuel tank. If this pump fails or is failing fuel delivery to the carburetor will be impacted causing low pressure to the carburetor.

Something to consider.
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Old 09-24-2015, 05:20 PM   #21
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Even if it's a carburetor engine it could still be a fuel pump issue. There should be an electric booster pump close to the fuel tank. If this pump fails or is failing fuel delivery to the carburetor will be impacted causing low pressure to the carburetor.

Something to consider.
I suggested fuel starvation in the beginning and the plug looks way too lean to me.
The symptoms of fuel starvation under load are very similar to a missing engine. Years ago I was going up a 10 k pass in Colorado in my 79 excella, when the engine started to sputter. Prior to my trip I installed a secondary electric fuel pump by the tank with a switch on the dashboard. Once i flipped the switch all troubles went away.
I would double check the fuel delivery components. Carburetors have an internal cylinder type cartridge filter that can cause all kinds of problems.

PS: Look at my avatar on the left thats on the summit of that 10 K pass (Molas Pass). Proof that I made it
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Old 09-24-2015, 06:47 PM   #22
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Peter, I totally missed your first post!

I would think if the fuel pump was failing it could run lean if you're not pulling hills but running at a steady high speed. Be interesting to see what Trident ends up finding to be the problem.

Brad
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Old 09-25-2015, 07:51 AM   #23
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I had a very similar problem once when I borrowed my fathers SOB motor home. I finally found the problem in the fuel selector valve as it had two tanks. I only filled the main tank so there was no need to mess with the valve. What I finally found was the fuel selector valve was not opening all the way thus restricting fuel flow through the valve causing a super lean condition.
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Old 10-03-2015, 07:38 PM   #24
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We limped from Bar Harbor Maine to Englewood Ohio and found a competent person with an analyzer that also works on trucks and yes even motor homes, problem solved.
I wish I could say that the problem was caused by sun spots, some imaginary hole in the ozone, or that myth sweeping the world, called global warming but I can't.
No the two spark plug wires 1&3 that I didn't have the strength in my hands to change failed. How ? Well I knew the wires got hot right where they pass by the EGR valve so last year I put fire proof white cloth packing ( not asbestos ) material in that space to protect the wires from some of the heat (but apparently not soon enough.) I didn't see it arcing to the block at that point at idle but under a load ( pulling a hill )it took the path of least resistance. By the time the analyzer was put on it had a bad miss at idle making it easier to find.
It's running great will now pass anything but a gas station. We are now at lake Santa Rosa State Park, NM and we couldn't be happier thanks for being there it helped a lot.
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Old 10-05-2015, 02:19 PM   #25
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After reading this I have only one thing to say... If you haven't done so or can't remember when you have replaced your plugs and wires or performed your basic maintenance then do it now. It's one of the first things I do when purchasing a new (used) vehicle. I change all the fluids, filters, plugs, wires, distributer cap and rotor as standard practice no matter what they look like. Much easier then chasing my tail when driving down the road.
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Old 10-05-2015, 08:43 PM   #26
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After reading this I have only one thing to say... If you haven't done so or can't remember when you have replaced your plugs and wires or performed your basic maintenance then do it now. It's one of the first things I do when purchasing a new (used) vehicle. I change all the fluids, filters, plugs, wires, distributer cap and rotor as standard practice no matter what they look like. Much easier then chasing my tail when driving down the road.

Good advice
Would not have helped here, but good advice.
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Old 10-06-2015, 09:30 AM   #27
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Not sure why it wouldn't have helped in your case as well. If all those items were replaced before you hit the road, the issues you've had would never have happened. You basically had bad plug wires from the start and that was never addressed. Still, glad you found the problem and can rest easier now.
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Old 10-07-2015, 11:51 AM   #28
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Not sure why it wouldn't have helped in your case as well. If all those items were replaced before you hit the road, the issues you've had would never have happened. You basically had bad plug wires from the start and that was never addressed. Still, glad you found the problem and can rest easier now.

As stated earlier in the letters I mentioned jest some of the things I have changed one year and about 6000 miles ago. I hope I don't need to change platinum plugs and wires every 6000 miles? The EGR valve insulation barrier from the factory had fallen away. I attempted to replace the barrier with material used in a furnaces but I apparently didn't get it in soon enough the damage was all ready started to the (new) wires. I see the tech used my fix after changing the two wires I didn't have the strength in my hands to change. In addition to this I didn't want to change the two wires at the new distributer cap and rotor on the plastic distributer.
Thanks for your input that is good advice to anyone that buys a used vehicle of any kind I have always tried to do jest that in my life.
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