Coast Resorts Open Roads Forum: Tech Issues: Exhaust manifold question


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2000flair

On the road - Eastern Canada

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Posted: 09/13/23 04:05pm

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RLS7201 wrote:

2000flair wrote:

RLS7201 wrote:

I suspect you may have a catalytic converter that is not flowing freely.
That will cause the exhaust manifold problems and power loss.

Richard

good point, is there a way for me to check that or is it something they must do a the shop?

A pressure gauge in the O2 sensor port would tell a lot.

Richard

Will take a loot at that for sure. Thanks

theoldwizard1

SE MI

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Posted: 09/14/23 03:30pm

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Likely no OEM manifolds available.

Aftermarket are "questionable" quality.

udidwht

Renton Highlands, Wa.

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Posted: 09/16/23 10:26pm

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Sounds as if 1 or more spark plug wires may have burned. Check all your wires carefully. It helps to wrap them with high temp sheaths (8) from the end of the wire.

Also check each of your exhaust donuts where the exhaust manifold meets the pipes. The donuts can burn up and you'll get excessive noise combined with power loss.

1994 Fleetwood Southwind Storm
P-30 chassis 7.4L 454 TBI 58,301 miles and counting....(as of 06/08/19)
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2000flair

On the road - Eastern Canada

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Posted: 09/17/23 02:00pm

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udidwht wrote:

Thanks, I’ll check the wires once more but they were replaced at the same time the manifolds were replaced the first time and they also added the temp sheaths.

I think there may be a problem with the combustion that makes the engine shake and loosens the manifold. The shop that installed them will take in the rig in 2 weeks to fix under warranty but seeing that it’s the 2nd time it happens i’d like to find the root cause so there is nit a third.
I will consider all the tips and advice everyone has given me and hopefully it’ll be corrected for good.