Loud truck

Tiny
BAKESTEAK
  • MEMBER
  • FORD F-150
1984 ford f150 w/ 150,000 mi had n exhaust leak. I changed the exhaust manifold gasket and when I started it up it was loud as ever. And now when I start it it runs very loud and will shut off if left idling. I had to take the carberator off to get to the maniflod and I was wondering if that could have something to do with it. It sounds like more than an exhaust leak but im fairly new to this stuff so I dont know. I would appreciate any help I coud get. THANX
Do you
have the same problem?
Yes
No
Thursday, March 29th, 2007 AT 7:18 PM

8 Replies

Tiny
MERLIN2021
  • EXPERT
Check you egr valve! May have rotted off the holding block.
Was this
answer
helpful?
Yes
No
Thursday, March 29th, 2007 AT 7:42 PM
Tiny
BAKESTEAK
  • MEMBER
How do I check the egr valve. I took it off to see if there was anythign obvious but I didnt notice anything. I did pull a little piece of round burnt up steel wool looking stuff. Thanks for the reply
Was this
answer
helpful?
Yes
No
Friday, March 30th, 2007 AT 2:51 PM
Tiny
MERLIN2021
  • EXPERT
Where did you find the steel wool? In the egr passage? If so get a steel coathanger and clear it out right to the throttle. But if the egr shown no signs of rotting out its not the reason for the exhaust noise! Get under the truck and check the converter. Air tube may be leaking, if it has one. But the only reason for loud exhaust noises is a loudy noisy exhaust!
Was this
answer
helpful?
Yes
No
Friday, March 30th, 2007 AT 4:26 PM
Tiny
BAKESTEAK
  • MEMBER
I found the steel wool looking stuff in the brass colored cylinder that surrounds the actual valve. I assume that if the egr valve was startign to rot out it would be obvious. I thnk the problem is in either the exhaust manifold or the intake manifold becasue those are the only two parts I removed. Or the carberator. I dont know if I forgot to put something back on or what but I have been messing with this truck for about a week now and it just seems to be getting worse. Is it an absolute necessity that I torque the bolts holding the manifolds on to the specifications because I did not. Is there anything in the carb that could make my truck loud or does it pretty much have to be the exhaust? Thanks again for all the help
Was this
answer
helpful?
Yes
No
Friday, March 30th, 2007 AT 6:22 PM
Tiny
MCFERRANCE
  • MEMBER
There may be a exhaust donut where the pipe bolts to the manifold that is leaking. Did you take the intake manifold off as well? Is this a 6 cylinder engine? Did you make sure to clean ALL of the old gaskets off and inspect the mating surfaces?
It is important to torque the bolts and in proper sequence as per the service manual.
Was this
answer
helpful?
Yes
No
Friday, March 30th, 2007 AT 8:39 PM
Tiny
BAKESTEAK
  • MEMBER
I did not do any of those things. I didnt think it was the donut because when I pulled the pipe off it didi not have a donut in it and it was not leaking from there but I guess it couldnt hurt to put one on. I didnt take the manifold completely off, I just pulled it away from the engine, pulled the old gasket out and sli the new one in. I didnt torque the bolts properly or clean the surface either. I didnt know the stupid thing could be so sensitive. I guess that is probably where my problem is. Thanks for the info.
Was this
answer
helpful?
Yes
No
Saturday, March 31st, 2007 AT 8:52 AM
Tiny
MCFERRANCE
  • MEMBER
Your particular application may not use a donut. But if any of the gasket material was left intact, it wouldn't properly seal whether torqued correctly or not.
Also, you can usually re-use the carb. Base gasket, but if it doesn't seal properly, it will cause a vaccuum leak, poor idling, and stalling.
Was this
answer
helpful?
Yes
No
Saturday, March 31st, 2007 AT 8:47 PM
Tiny
BAKESTEAK
  • MEMBER
I got it all straightened out. There was a little piece of the old gasket left on the manifold. I didnt know that it would make such a difference. Thanks for all the help. Ill look you up next time I have to get my truck inspected.
Was this
answer
helpful?
Yes
No
Sunday, April 1st, 2007 AT 8:40 PM

Please login or register to post a reply.

Recommended Guides