2007 Nissan Frontier - Top speed is 60 MPH

Maintenance/Repairs
1

My 2007 Nissan Frontier SE 4x4 V6 4.0 wont accelerate after it reaches 55 or 60 MPH what’s up with that.

2

What happens when you try to accelerate? Do the RPMs go up or stay the same? If they go up I’d suspect transmission problems. If they don’t, you might have a clogged catalytic converter.

3

I just replaced both cats

4

Oh and the RPMs go up

5

Is the check engine light on? Is it an automatic? Or a manual? How many miles on it? Why did you replace the cats?

6

how much of the exhaust system was replaced? cats. resonators. mufflers?
whose idea was it to replace cats? has a mechanic inspected this vehicle?

7

Based on what you’ve posted, I suspect transmission problems. Assuming it’s an automatic, have you checked the fluid lately? How long since it was changed?

4 Likes
8
  1. Car won’t accelerate. Replace exhaust.
  2. Still won’t. Hmm, replace trans?
9

Is the check engine light on? Has your shop checked for engine/transmission diagnostic codes? The computer will respond to certain failures it detects by putting the vehicle in a reduced power mode. There should be diagnostic codes stored if that’s what’s happening. You may need a mode-6 real time parameter test, in particular for fuel trim.

10

Yet your “mechanic” chose to replace the cats?

1 Like
11

I wondered about that too but I presumed the cats were replaced for some other reason. You could easily be right, though.