I have a 1985 Ford F150 4x4 with a 300 inline straight 6 in it. It will not go over 25 mph. It also has a hissing noise coming out of the tail pipe. Can anyone help me figure out what is wrong with it?????


Asked by Mar 17, 2014 at 10:30 PM about the 1985 Ford F-150 XL Standard Cab 4WD SB

Question type: Maintenance & Repair

5 Answers


you may have backed into something and kinked the exhaust pipe restricting flow, what goes in must go out and over 25 mph you would be surprised the volume of air needing to flow thru

1 of 1 people found this helpful.

A plugged Catalytic Converter is very likely too. Unbolt the exhaust right after the Exhaust manifold and give it a try. It's noisy. Most Muffler shops are willing to check it out too. It's simple and quick for them.

1 of 1 people found this helpful.

see thats what we have been thinking we haven't had this truck but a month and we just can't seem to get it running right. Thanks we will be taking it apart today


we fixed it the Muffler was messed up and full of stuff thanks so much ya'll


Great! Enjoy your truck!

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