2000flair
On the road - Eastern Canada
New Member
Joined: 07/08/2023
View Profile
 Offline
|
A while ago we had a big exhaust leak on my 2000 Flair, Workhorse 7.4L. We took it to the shop and they replaced both manifolds.
2 days after we got it back, we went on the road and after 20 minutes the problem came back on the drive side only. We took it back to the shop and they fixed it under warranty, they said the manifold they installed was defective.
We drove it a couple of times, about 500km each time without a problem.
Last Friday we went out again and at some point the engine started stuttering, then vibrating hard enough that the steering wheel was shaking some. I slowed down and the vibration went away but the RV lost a lot of power and it started smelling like gas inside. I pulled over turned the engine off and looked around but didn't see anything abnormal (I am definitely not a mechanic but I tried all the same).
I started it again and went back on the road. The driving was better but the tapping noise from the manifold started a couple of minutes after that. Not very loud at first but by the time we reach our destination it was like the first time we had the problem.
I imagine the heads are not the problem since the shop replaced the manifold twice and never mentioned that to be a potential issue.
Is it possible that it's coming loose? Does anyone have an idea of what may be causing this to occur?
Thanks.
|
IB853347201
Eastern Ontario
Senior Member
Joined: 06/18/2018
View Profile
Offline
|
Could be an ignition issue. When was the last time you had your spark plugs and wires replaced?
2010 Suncruiser
|
jimh406
Western MT
Senior Member
Joined: 06/11/2006
View Profile
Offline
|
Definitely possible for the manifold to be loose.
'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.
NRA Life Member, CCA Life Member
|
RLS7201
Beautyful Downtown Gladstone, MO
Senior Member
Joined: 10/26/2002
View Profile
Offline
|
I suspect you may have a catalytic converter that is not flowing freely.
That will cause the exhaust manifold problems and power loss.
Richard
95 Bounder 32H F53 460
2013 CRV Toad
2 Segways in Toad
First brake job
1941 Hudson
|
2000flair
On the road - Eastern Canada
New Member
Joined: 07/08/2023
View Profile
Offline
|
IB853347201 wrote:Could be an ignition issue. When was the last time you had your spark plugs and wires replaced?
They were replaced the first time the change the manifolds in July.
|
|
|
2000flair
On the road - Eastern Canada
New Member
Joined: 07/08/2023
View Profile
Offline
|
jimh406 wrote:Definitely possible for the manifold to be loose.
I have a feeling that may be it but I'm only learning all of this so I appreciate the input of more experienced people. https://www.rv.net/SharedContent/cfb/images/smile.gif
|
2000flair
On the road - Eastern Canada
New Member
Joined: 07/08/2023
View Profile
Offline
|
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?
|
fyrflie
Martinez, CA. USA
Senior Member
Joined: 07/31/2003
View Profile
Good Sam RV Club Member
Offline
|
I recently had my manifolds resurfaced. I installed them exactly to factory torque specs. New studs, nuts, etc.
After several hundred miles, I found two nuts that were loose. Retorqued to factory spec and so far no more issues.
Did the shop check the new manifolds to make sure the surfaces were flat ? Just because they’re new doesn’t guarantee anything.
Good luck and let us know how it all turns out.
|
RLS7201
Beautyful Downtown Gladstone, MO
Senior Member
Joined: 10/26/2002
View Profile
Offline
|
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
|
2000flair
On the road - Eastern Canada
New Member
Joined: 07/08/2023
View Profile
Offline
|
fyrflie wrote:I recently had my manifolds resurfaced. I installed them exactly to factory torque specs. New studs, nuts, etc.
After several hundred miles, I found two nuts that were loose. Retorqued to factory spec and so far no more issues.
Did the shop check the new manifolds to make sure the surfaces were flat ? Just because they’re new doesn’t guarantee anything.
Good luck and let us know how it all turns out.
Thank you, I'll ask them to check for that.
|
|
|
