SHO hesitates

[Tha Green SHOrnet]

My SHO hesitates when I take off from a stand still and it hesitates even worse when I'm driving and is running the air-conditioner. I can feel it jerking and hesitating while i'm driving. If I'm at a corner and traffic is heavy, i'm afraid punch it to get into the traffic because it might stall. Can someone tell me what this problem is?
Also something is knocking very loud under the car. I can mainly hear it as i'm going over a bumpy street while turning a corner. Can someone also tell what this could be?

Thanks
Tha Green SHOrnet

 

[remy_zero]

It could possibly be a dirty MAF. I had this happen in my 93 SHO, and I just cleaned the MAF and it cured my hesitating. Just an idea. When you take off the MAF, and correct me someone if I'm wrong, there are two little wires that sense the airflow(or something like that). Those two little pronged wires get dirty and cause poor performance.

 

[sdpatt]

By hesitation, do you mean that the engine lacks power and does not respond to the gas pedal motion or do you mean that the engine misfires and stumbles when you are trying to apply throttle? The first could be caused by a bad throttle position sensor or dirty mass air flow sensor filaments and the second could be caused by bad spark plugs, bad plug wires or oil in the spark plug wells.

Knocking under the car? Let me listen... oh, now I hear it. It could be one of many things in the suspension or the last cat that you ran over. Non specific noises are extrememly hard to diagnose over the internet. Front suspension? Rear? When turning? Sharp bumps? More information would be helpful.

 

[Tha Green SHOrnet]

Thanks Remy_Zero and sdpatt for your prompt replies. I will look into both of your suggestions. Thanks again.

 

[bradman]

In my experience, hesitation can also be caused by O2 sensors indicating lean, thus causing the EEC to compensate rich. In extreme cases, the engine will "bog" initially when you hit the throttle, or even stall, due to a near flooding condition, until the mixture leans enough to pick up the RPMs. You should see if you have any diagnostic codes by running the EEC self test procedure at www.shotimes.com.