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Old 08-08-2022, 10:42 AM   #1
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Holiday Rambler dying issue

1987 holiday rambler aluma-lite xl class A motorhome 7.4
Loses power or dies shifting from first to second every time. It usually loses power and doesn't die, but after it shifts out of first it doesn't go in to second gear it gets so quiet it seems to have died, so I turn the steering wheel and realize I still have power steering so I know it hasn't died when I give it gas immediately I get nothing no power and no sound just silence again making me think that it died and I'm just coasting. By now a few seconds have passed. I'm assuming at this point I'm still in first gear and I give it gas again, the transmission finally goes into second gear and the power is there. At this point I can hear the engine and I'm picking speed just fine. Any ideas or suggestions?
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Old 08-08-2022, 11:48 AM   #2
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Be a good idea to find a transmission shop while its still moving on it's own power. Could just be low on trans fluid I guess.
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Old 08-08-2022, 03:20 PM   #3
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A vacuum leak to the trans modulator will make the 1-2 shift kinda slip.
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Old 08-08-2022, 03:27 PM   #4
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Is the 454 a throttle body injector, or carb?
When is the last time you changed the fuel filter?
Could there be water in the fuel?
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Old 08-08-2022, 07:43 PM   #5
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Speaking of changing fluids, when last was the A/T fluid and filters replaced?
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Old 08-08-2022, 11:08 PM   #6
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Do you have a tach. Is tach raising as this happens. Is it slipping and rpms are going up and no acceleration . I kinda assume you would hear engine revving up ,even though without putting torque out its smoother and quieter.
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Old 08-09-2022, 09:26 PM   #7
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I would check for vacuum at the vacuum modulator at the rear of the transmission first. If the modulator sees low vacuum, the transmission will not top-shift until high rpm.

You should have a TH400 in a 1987 Chevy RV. The vacuum modulator affects the shift points with the use of engine vacuum.

- Start the engine and leave the transmission in park.
- Locate the vacuum modulator on the passenger side rear of the transmission.
- Check the rubber hose end and the metal tube for leaks. Shut off the engine and replace the hose if you find a problem.
- Pop the vacuum hose off the modulator and install the vacuum gauge/pump. The gauge should read close to 20 inches of vacuum at idle. If not, check the source of the vacuum on the intake manifold for a leak, blockage.

Also check to make sure you have no transmission fluid leaking from the modulator (externally, or through the vacuum port).
A leak from the vacuum port indicates the modulator diaphragm is torn. If so, the modulator will be malfunctioning and the engine will suck the transmission fluid out of the transmission and it be burnt in the engine. Also if the leak is bad, you might see white/grayish smoke from the exhaust. At that point I check to make sure the trans fluid is still full.

If you have a vacuum pump, install it on the modulator, and pump it up 10- 20 inches of vacuum. Verify it holds vacuum. It should be able to hold the vacuum for a few minutes without dramatic loss of vacuum. If it looses vacuum, replace the modulator.



Quote:
Originally Posted by Channing View Post
1987 holiday rambler aluma-lite xl class A motorhome 7.4
Loses power or dies shifting from first to second every time. It usually loses power and doesn't die, but after it shifts out of first it doesn't go in to second gear it gets so quiet it seems to have died, so I turn the steering wheel and realize I still have power steering so I know it hasn't died when I give it gas immediately I get nothing no power and no sound just silence again making me think that it died and I'm just coasting. By now a few seconds have passed. I'm assuming at this point I'm still in first gear and I give it gas again, the transmission finally goes into second gear and the power is there. At this point I can hear the engine and I'm picking speed just fine. Any ideas or suggestions?
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Old 08-12-2022, 06:11 PM   #8
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Quote:
Originally Posted by D Gardiner View Post
I would check for vacuum at the vacuum modulator at the rear of the transmission first. If the modulator sees low vacuum, the transmission will not top-shift until high rpm.

You should have a TH400 in a 1987 Chevy RV. The vacuum modulator affects the shift points with the use of engine vacuum.

- Start the engine and leave the transmission in park.
- Locate the vacuum modulator on the passenger side rear of the transmission.
- Check the rubber hose end and the metal tube for leaks. Shut off the engine and replace the hose if you find a problem.
- Pop the vacuum hose off the modulator and install the vacuum gauge/pump. The gauge should read close to 20 inches of vacuum at idle. If not, check the source of the vacuum on the intake manifold for a leak, blockage.

Also check to make sure you have no transmission fluid leaking from the modulator (externally, or through the vacuum port).
A leak from the vacuum port indicates the modulator diaphragm is torn. If so, the modulator will be malfunctioning and the engine will suck the transmission fluid out of the transmission and it be burnt in the engine. Also if the leak is bad, you might see white/grayish smoke from the exhaust. At that point I check to make sure the trans fluid is still full.

If you have a vacuum pump, install it on the modulator, and pump it up 10- 20 inches of vacuum. Verify it holds vacuum. It should be able to hold the vacuum for a few minutes without dramatic loss of vacuum. If it looses vacuum, replace the modulator.
Thank you that definitely makes sense I was under there today didn't see a problem but now I know exactly where look thank you I will check it out today
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Old 08-12-2022, 06:15 PM   #9
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Quote:
Originally Posted by vito.a View Post
Is the 454 a throttle body injector, or carb?
When is the last time you changed the fuel filter?
Could there be water in the fuel?
Change all three fuel filters and pump 6 months ago and it's carbureted (Quadrajet)
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Old 08-12-2022, 11:59 PM   #10
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Or I am thinking maybe TORQUE CONVERTER LOCKING, causing engine to BOG? Maybe a simple fix, tho? e.g. wire, solenoid, linkage...? but cud b engine issue, such as TPS, or MAS? CHECK CODES??? Good Luck
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