My truck makes a shhhh sound when I accelerate the air pedal?

Tiny
JOJOS10
  • 1995 CHEVROLET S-10
  • 64,000 MILES

I had my catalytic converter checked that's not it, plus my truck jerks if I accelerate to fast also I can press the air pedal all the way down and it wont speed up at all, I checked my transmission, it switch gears my belt is good. So, over all I hear the "sHHHHH" sound only when I accelerate the air pedal, and when I accelerate fast from stop position it wont move fast it will climb RPMS slow.

Do you
have the same problem?
Yes
No
Sunday, October 7th, 2012 AT 8:59 PM

11 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,517 POSTS

Sounds like the cat converter is clogged. Have the back pressure checked to verify

Roy

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 9:49 PM
Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

Did you check for trouble codes? Is the Malfunction Indicator Light showing?
Noise described seems to indicate a leak somewhere or clogging in exhaust system.

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 9:49 PM
Tiny
JOJOS10
  • MEMBER

Roy yes it was checked, also, no cel comes on.

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 10:26 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,517 POSTS

How was it checked? What was the back pressure measurement?

Roy

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 10:36 PM
Tiny
JOJOS10
  • MEMBER

I saw him put his hand over tail pipe.

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 11:33 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,517 POSTS

Thats not a test. It can still pass enough exhaust to feel it but not let the engine breathe.

Thats why you need to measure the back pressure.

Roy

Was this
answer
helpful?
Yes
No
Sunday, October 7th, 2012 AT 11:36 PM
Tiny
JOJOS10
  • MEMBER

@ Roy I just had my cat converter installed a month ago my engine is good, it never blow black smoke out the tail pipe also, thank you for taking the time to help me with this problem.

Was this
answer
helpful?
Yes
No
Monday, October 8th, 2012 AT 2:26 AM
Tiny
EVOLVE960
  • EXPERT
  • 49 POSTS

Sounds like a gross vacuum leak actually, something intake side or brake booster. Those are the biggest lines you have in the system ( 1/4 ) some larger. Especially if its leaking to the booster that will cause a whole host of issues. If vacuum is dropping in the system it also could be shutting down the fuel pressure regulator which would allow more fuel into the rail under hard acceleration.

Was this
answer
helpful?
Yes
No
Wednesday, October 10th, 2012 AT 12:37 AM
Tiny
JOJOS10
  • MEMBER

I found out it is the EXHAUST manifold flange gasket. May I ask will this cause all these symptoms?

Was this
answer
helpful?
Yes
No
+1
Wednesday, October 10th, 2012 AT 1:00 AM
Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

Yes, exhaust leaks can cause performance related issues. Have it rectified first.

Was this
answer
helpful?
Yes
No
Wednesday, October 10th, 2012 AT 1:46 AM
Tiny
M_H_RITZEL
  • EXPERT
  • 2,770 POSTS

Check the vacuum line going into the truck. It is by the brake booster. One side goes to the engine and the other to a t with one part going into the firewall. The vacuum line works the heater control. The other side is plugged into a caninster inside the drivers side fender.

Was this
answer
helpful?
Yes
No
Please consider a donation if we helped you
Tuesday, October 16th, 2012 AT 8:31 PM

Please login or register to post a reply.

Related Accelerator Questions

Recommended articles