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Old 01-27-2006, 08:14 AM   #29
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Very reluctantly , I,m jumping in with Terry (not reluctant because of Terry, but because of my previous mess-up with my entry concerning the carb floats ). Choke certainly sounds like it. If that plate isn't closing after a good flooring of the accelerator pedal when it's dead cold, you've got your problem. An open choke plate when cold will cause all the symptoms you've mentioned. (I remember guys hovering over their carbs on cold mornings with their hands cupped over the throat to simulate a choke.) Years ago there used to be a manually adjustable spring load on the side of the carb you could dial to make the choke react longer or shorter by rotating the plastic housing. Sort of a "semi-automatic" version of the old pull cables for choke operation. I don't know if you have that on your engine, but it's a round plastic covered cover on the side of the carb, if you do. As Terry has given several possible reasons for the choke to be malfunctioning, there's no need to add much, but I did want to mention the spring load. Waiting to hear the "final" diagnosis .
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Old 01-27-2006, 08:14 AM   #30
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..................When , you get home you might check into converting your old points ignition system over too an MSD Solid state ignition ystem with a 6A module and a MSD billet aluminum distributor . Be the best money you ever spent on that motor home . They build a high quality product and it's very easy to install . good luck on your trip . r66
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Old 01-27-2006, 08:19 AM   #31
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Originally Posted by route66
..................When , you get home you might check into converting your old points ignition system over too an MSD Solid state ignition ystem with a 6A module and a MSD billet aluminum distributor . Be the best money you ever spent on that motor home . They build a high quality product and it's very easy to install . good luck on your trip . r66
My 89 MoHo has solid state ignition. Were they still using points in '84? Just curious...
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Old 01-27-2006, 09:12 AM   #32
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Originally Posted by guy99
Hello everyone,
We are currently on the homeward leg of our 6000+ mile trip from Northern California to Puerto Peņasco, MX and New Orleans, LA.

.
"

Now that the mechanical wizards have solved your problem and it appears you will be getting home safely can we expect pictures of this amazing trip?
I am quite envious and eager to hear of the travel.
P.S. I am also happy to hear that you are traveling safely with no major mechanical problem.
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Old 01-27-2006, 11:44 PM   #33
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I think you spoke too soon, Chaplain

I'm sitting in the parking lot of a Chevy dealer in San Bernardino awaiting my 7AM appointment wiht the servce department (who may or may not be able to help me before Monday).

We left Gila Bend this morning after having the most difficult time ever getting the Silver Slug started in the morning. Drove 300+ miles passing thru Quartzsite, AZ where we stopped to buy gas (man was that place a zoo) with no problems. When we hit some traffic in this area and had to slow down, the engine began missing and backfiring when I attempted to accelerate hard. Seems to run sort of OK under mild acceleration. Decided not to head for Barstow and stopped here to find assistance. I pulled the fuel filter out of the carb in case that was the problem but that made no difference.

So tonite we'll sleep in the parking lot (they have 30 amp plugs in their parking lot) and see what tomorrow brings.

Life is an adventure.
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Old 01-28-2006, 08:20 AM   #34
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I'm sitting in the parking lot of a Chevy dealer in San Bernardino awaiting my 7AM appointment wiht the servce department (who may or may not be able to help me before Monday)....Life is an adventure.
At this point I would suggest purchasing and installing a fuel pressure kit (see post #6 this thread) - the rear pump may be intermittant - filter/pickup problems, mechanical problems, or electric problems - the oil pressure switches installed on the lower front drivers side of block (safety switches installed so that the rear fuel pump will not run unless the engine is running) have been known to fail.
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Old 01-28-2006, 09:22 AM   #35
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Quote:
Originally Posted by guy99

Drove 300+ miles passing thru Quartzsite, AZ where we stopped to buy gas (man was that place a zoo) with no problems. When we hit some traffic in this area and had to slow down, the engine began missing and backfiring when I attempted to accelerate hard. Seems to run sort of OK under mild acceleration.

Hum...Any chance you have trash/sediment/water/bad gas in your fuel tank? Just couldn't help but notice you went 300 miles with no problems, and then as soon as you bought gas the engine began to act up again. Possible stirring up of junk in bottom of tank? Odd that it seems to settle out, but weird things are common with fuel difficulties. Almost sounds like possibly the trash is just bad enough to give you problems, but not enough to completely block the flow. Rear pump, etc. are certainly capable of causing the same symptoms, but that info on filling the tank and THEN having problems kind of stuck out.
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Old 01-28-2006, 09:35 AM   #36
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My post wasn't clear, I bouht gas in Quartzsite, 200 miles back. I have between 1/2 and 1/3 tank. The station where I bought fuel was very high volumn so I don't think they were selling bad fuel. I've run much lower on fuel and not had any problems.

The filter in the carb looked very clean when I removed it.

The way it acts is sort of like the accelerator pump isn't working or the secondaries are functioning properly. I am confused by the backfiring though.
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Old 01-28-2006, 09:51 AM   #37
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Originally Posted by guy99
My post wasn't clear, I bouht gas in Quartzsite, 200 miles back. I have between 1/2 and 1/3 tank. The station where I bought fuel was very high volumn so I don't think they were selling bad fuel. I've run much lower on fuel and not had any problems.

The filter in the carb looked very clean when I removed it.

The way it acts is sort of like the accelerator pump isn't working or the secondaries are functioning properly. I am confused by the backfiring though.
Guy,

I wasn't insinuating you got the bad gas during that last fill-up, only that you could have had some trash in your tank all along. If that is stirred into your rear filter when you gas up, some may settle out, but enough could be partially blocking that filter to cause symptoms you're describing. Sure sounds like fuel starvation, so I was trying to go after one of the reasons that can happen. I can't remember, but have you removed the rear filter and shaken it out with the tank side down? Long shot, but if you see any sediment or trash with that procedure, it could point to (or eliminate) trash as a cause. After eliminating that possibility, I'd agree with 87MH that the fuel pump at the rear would be next in line for testing. Don't you just love these bizarre symptoms that no one can quite figure out? Goes with the territory, I guess . Keep us posted. I want to know what to do when my rig does this .

Best.
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Old 01-28-2006, 10:23 AM   #38
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Well, as I mentioned, I have admitted that I am powerless before this problem and turned it over to my hig.... Oops, local chevy dealer.

I'll keep you all posted. And I'm happy to answer questions for those who enjoy the puzzle aspect of this situation.
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Old 01-28-2006, 11:46 AM   #39
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Backfiring through the carb or the exhaust? Check to make sure the carb manifold mounting bolts (4 10mm) are tight. I ran into almost the same symptoms and it turned out to be a combination of loose carb bolts (allowing vacuum leak at the carb base - causing backfiring through the exhaust) and a bad frame rail fuel filter.

It drove me crazy with intermittant behavior until I found it.
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Old 01-28-2006, 10:26 PM   #40
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Update

Steve, the backfiring was through the exhaust.

Dealer looked at the Slug today. Replaced the coil. We took off around 3PM today and made about 140 miles. No further symptoms. We'll see how it starts in the morning.
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Old 01-29-2006, 07:19 AM   #41
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Coil?

Coils have fixed stranger problems. It may have fixed the backfiring problem, I guess time will tell if it also fixes the hard start problem, let us all know. We are hanging on the edges of our collective seats for the outcome.
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Old 01-29-2006, 09:26 AM   #42
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This has made me curious!

Guy,

Over the years, I've have had similar electrical breakdowns which can seem like fuel problems.

My last auto was a 93 STS w/northstar & 4 coils. Twice in 140,00 miles I had drivability complaints as stumbling, gas smell on start-up where it would run rough when cold, after warm-up many problems seemed to disappear.

The fix was usually 1-3 bad coils!

I hope the coil fixed your Motorhome!
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