Skip the auto shop - Our mechanics make house calls

Q: Truck wont accelerate over 20mph. what can it be

asked by on

92 ranger xlt v6 4.0 transmission replaced, fuel injectors replaced, heads new, engine replaced 500 miles on engine. Had multiple mechanics look at it but they can't figure it out. Truck wont go faster than 20mph Any ideas?

Either you have a blocked exhaust like a bad converter, a muffler clogged from a broken up converter, or you have a bad ignition module or fuel pressure problem. First try replacing the fuel filter to see if it is clogged. Check to see if the fuel pressure is at 40 psi. If this is okay, then see if the exhaust is blocked. If you would like another opinion on the car, a certified pro from YourMechanic can inspect the acceleration issue and let you know what should be done.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Bad battery in car.

Hi there. If the engine is not cranking over then the most common issue is the battery. Your battery would need to have a load test done to verify if it has failed. If the battery is fine and it...

Q: I'm trying to find out what is wrong with my car

Based on the symptoms you described it seems as if your fan clutch or water pump may be having an issue. I would recommend having your cooling system pressure tested by a qualified professional to determine the exact source of...

Q: Converting

The body for these two models are different. The mounting locations for the the front header panel is going to be different on each one. You can try, but I do not think the parts will be interchangeable.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.