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Old 03-13-2010, 12:14 AM   #15
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Similar problem, different engine.

Quote:
Originally Posted by drag'nwagon View Post
Tim,

9 times out of ten on big block chevys (especialy if they sit for long periods) it is the rotor and cap. Since you said the fuel pump is humming that is the first thing I would I do (it is also the cheapest). If it were a vac problem you would most likely hear it hissing.
Hi, My Mac Tools truck was acting like it was starving for fuel, but in acuality it was just a bad distributor rotor. These are known for grounding under load on any GM engine that has HEI system. Many a good mechanic was fooled by this because of the fuel starvation type symptoms. It's cheap and a good place to start without wasting time and money on fuel system parts.
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Old 03-13-2010, 04:02 AM   #16
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Bad Fuel

How old is your fuel? Did you add new to old fuel? My suggestion is drain and replace fuel. You can start off with 10 gal or so to be sure. This is an easy fix/test. I am a Auto/Truck technician and can tell you bad /old gas acts just like that.
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Old 03-13-2010, 06:55 AM   #17
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Quote:
Originally Posted by drag'nwagon View Post
Tim,

9 times out of ten on big block chevys (especialy if they sit for long periods) it is the rotor and cap. Since you said the fuel pump is humming that is the first thing I would I do (it is also the cheapest). If it were a vac problem you would most likely hear it hissing.
We used to just pop it off, and hose the inside of the cap with WD-40...
sorry to hear your plans cancelled en-route... that's the worst... hope you're down-the-road soon!
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Old 03-13-2010, 07:12 AM   #18
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Agree with Robert...

Would go to the distributor/ign module first. Our 454 Burb exhibited the same
backfire/power symptoms several times in it's 160k. Once carbon tracks in the dist cap, once the ign module.

Your plan is a good one and probably worthwhile if your maint. history justifies it.

Good luck...
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Old 03-13-2010, 07:44 AM   #19
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i'll also join the rotor bandwagon. if the bottom of the rotor looks orange, the advance weights are rusting. hit those with some wd-40 so they don't rust and bind.
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Old 03-13-2010, 10:05 AM   #20
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B-cup---Good suggestions here about the ingition system---but I would start with the fuel filters first. We have a 290 MH and have had the very same problem twice in the last 30,000 miles.

Both times it turned out to be fuel filters. You should find three filters if your MH has a carburater---one by
the electric fuel pump---one along the fuel line that runs along the frame (usually about half way forward)---and one inside the carb where the fuel line enters the carb.

I have changed the first two filters on our coach but have never needed to change the one in the carb---cured the problem both times!!!

Dist cap, rotor always a good thing to do. If you need ignition wires, be sure to get high quality HIGH TEMP wires only---they will take the heat these monsters create--if routed properly

Hope this helps---Bob
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Old 03-13-2010, 10:11 AM   #21
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Definitely replace all the fuel filters. My rig has three, one at the rear pump, one under the step, and one in the carb at the fuel inlet.

But, if you heard backfires, I'll give odds your problem is ignition.
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Old 03-13-2010, 10:13 AM   #22
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Sorry your trip was cancelled.
Check (replace) your vaccum lines. The spark advance/retard may not be working. When you put the pedal to the floor is sounds like flooding or ignition bad timing. Have the carb inspected look under the cap for signs of arcing. A fuel filter will cause a sluggish response. However it usually does not cause backfiring.
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Old 03-13-2010, 10:24 AM   #23
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I'll jump in on the cap roter combo. Chevy's HEI seem's to be prone to roter/cap failure. Your symptems seem ignition to me,not fuel. Adios, John
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Old 03-13-2010, 10:32 AM   #24
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My $ .02 worth. If it sputters under 45mph=Ignition. Over 45mph usually fuel.
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Old 03-13-2010, 11:43 AM   #25
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We had an old Chevy crewcab with a 454. Rebuilt the carburetor twice over the years, because the float went bad (sank) and overfilled the bowls, which flooded the engine. It would run, but no power. The big clue was a really strong gas smell from fuel running out of the carb. It's getting harder and harder to find anyplace that rebuilds carburetors anymore...
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Old 03-13-2010, 11:59 AM   #26
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I have had the problem twice both times fuel filter.

What I do not understand is the loss of power in reverse but no problem going forward unless you got on it. Mine did the same thing.

Always carry a spare as they can go out with little notice.
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Old 03-13-2010, 09:39 PM   #27
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Quote:
Originally Posted by Buttercup View Post
no power to the MileMarker Overdrive.
was sputtering,
zero power
backfiring
wasn't enough power.
Had same, but at highway speed, second time on takeoff from light.

Turning key off and back on, it drove home, motor runs fine, proceeded to replace parts recommended by others and did tests, did a 2500 mile trip never to happen again, my problem is I don't know which item fixed it. So I hope you try motor after each procedure, then you will know what fixed yours as your problem isn't intermitant. Mine didn't have any symptoms outside of the two times losing power.
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Old 03-14-2010, 02:28 PM   #28
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Exclamation Sputtering cancels our trip

Just thought I would fire up my 454 and suddenly I had a BAD CASE of the Sputters. Could'nt figure it out for a minute, then hit the boost pump switch and viola! sputters gone. Seemed like ignition but when I hit the Auxillary pump everything went back to normal. The extra 3 feet added to the chassis when AS built it is more than the mechanical pump on the engine and the tank pump will handle on my rig, so the boost pump just back of the step has to be on or it's no go period.
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