1998 GT i can feel the issue in the gas peddle

[JojoGT98]

Okay so I just got my first Mustang ever it's a 1998 GT. A lady was moving and it belonged to her husband who had died four years before but she said that he had just rebuilt the engine before he passed away. Anyhow so I can feel the problem that I'm going to describe in the gas pedal it feels like a bumping / grinding feeling at low RPMs and I almost would want to say that it was similar to like a rod knock because I just had a Buick that had a rod knock but if it doesn't have the sound though. Like that clack clack clack clack. I was able to feel that same feeling in the gas pedal of my Buick but now here I'm driving this new Mustang that I really don't know exactly what has been done to it. And I just want to try to troubleshoot this issue without having to go to a shop because my budget is little to none. Under the hood engines completely clean when I lift the hood and I throttle up I don't hear anything the engine sounds totally quiet so I was wondering would it be possibly a exhaust leak or transmission issue or something I mean has anybody else to experience this? really you can feel it in the gas pedal for sure as I accelerate the sound / feeling kind of goes away but then I always feel that that feeling whatever the hell that sounds like feeling is on the gas pedal. The oil looks clean I mean like I didn't do a oil change or anything just pulled the dipstick. didn't see any metal flakes or didn't look dirty or anything no milk and it smells all right. Any ideas should this be an issue where I just like park the car until I find out what it is so I don't hurt the motor

 

[Potomus Pete]

Its probably nothing. You would know it if its a rod.

 

[wmburns]

Are you looking for an educated guess? How about bad motor mounts?

WHY? The Mustang is hard on motor mounts. When they break it causes the motor to set lower in the K-member. This allows an easy path for the motor's vibration to the car's frame.

When comparing two cars one with a good motor mount and one with a bad mount the motor will set lower in the K-member (enough to notice when you know to look for it).

 

[JojoGT98]

So since then at low idle now . the is a definite knocking almost a thud that you can feel and hear from the inside of car . it's a inconsistent thudd .. So motor mounts is it? I'll have to slide up in there and take a good look its kinda hard when I don't have the place or tools. I'll let you know

 

[Potomus Pete]

The motor mount makes a ton of sense. Mine were metal to metal. Not even mounts anymore ,and my shroud was way low. Check and see if your fan is centered in the middle of the shroud. Its probably hanging way low. I recently replaced my mounts and it made a huge difference in sound and vibration. Its easy to do mounts if you have two jacks. Just read up. If its a mount you could go for a while, mine had no rubber left for a long time.