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Old 05-14-2013, 08:57 AM   #1
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Power problem

My TBFI 454 seems to run smooth but when I get on the gas it just does not have much power , then I let up on the gas just a little and it seems to have more power. I wonder what It is causing this. I tuned it up last month with plugs,wires, cap and rotor.
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Old 05-14-2013, 09:04 AM   #2
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Did you check the fuel filters?
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Old 05-14-2013, 09:54 AM   #3
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Originally Posted by wvabeer View Post
My TBFI 454 seems to run smooth but when I get on the gas it just does not have much power , then I let up on the gas just a little and it seems to have more power. I wonder what It is causing this. I tuned it up last month with plugs,wires, cap and rotor.
Automatic transmission? If so, may need adjustment or may be low on fluid.
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Old 05-14-2013, 10:36 AM   #4
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I replaced the fuel filter and Dunn automatic transmission fluid to
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Old 05-14-2013, 08:32 PM   #5
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I was wondering if the Fuel injection could be the problem
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Old 05-15-2013, 07:17 AM   #6
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It has done this from the first time I drove it. Especially climbing mountains ,mash the gas and not much response but let up a hair and it seems to have more power.
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Old 05-15-2013, 07:29 AM   #7
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Exhaust restriction, bad Cat converter, "old school" quick trick, remove oxygen sensor and drive, if it's a bit noisy with more power, check for a naughty kitty.

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Old 05-15-2013, 05:25 PM   #8
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Also remove gas cap. If pump can't pull it will starve. If tank full of junk the tank dock "filter" may be issue. Or could be several of these choices. Also if still on distributor check vacuum advance.
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Old 05-15-2013, 06:55 PM   #9
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Power problem

Mechanics chased a similar problem with my Cadillac's 8.2 Liter V8. It was an intermittent fuel delivery problem that was worsened when the motor was being stressed . . . most severe when climbing a grade with less than 1/2 tank of fuel. My usual mechanic replaced the fuel pump twice as well as all three fuel filters between tank and carburetor but the problem persisted. A mechanic (and excellent diagnostician) who specialized in repairing farm trucks offered to take a look at the problem. Within an hour he had diagnosed the problem as a clogged/collapsed fuel filter sock mounted on the fuel pick-up in the tank. Less than an hour later he had the tank drained and dropped . . . and the sock was collapsed and nearly clogged with varnish and other dirt. He replaced the filter sock and all has been well for the past six years.

I had another issue with the Cadillac many years ago that produced similar symptoms, but also caused the motor to run significantly hotter. That issue was traced to an exhaust heat riser valve rusted solid in an 85% closed position. A new exhaust heat riser valve solved the problem. That valve is now on my annual preventative maintenance check list.

I don't know whether either of these could be an issue with your motorhome's 7.4 liter, but thought that I might mention them as potential issues.

Good luck in locating your coach's gremlin!

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Old 05-15-2013, 08:31 PM   #10
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Also remove gas cap. If pump can't pull it will starve. If tank full of junk the tank dock "filter" may be issue. Or could be several of these choices. Also if still on distributor check vacuum advance.
I drove this to Florida and back and ran fine. it climbed Hills just fine just slow.. it does not have vacuum advance
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Old 07-09-2013, 08:21 PM   #11
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im not sure about the FI chevys but us with the caburators have a secondary electric fuel pump. mine have an on and off switch works ok off unless going uphill the fuel have a hard time getting to the carb.
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Old 07-09-2013, 08:26 PM   #12
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I had a similar issue on a carbureted P30 chassis, the carbon canister vent system failed...loosening the gas cap fixed the symptoms and id'd the problem.

The tale tail was a giant "boing" about :30 seconds after shutting off the engine. It was the gas tank letting go of its vacuum induced collapsed state!
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