Skip the auto shop - Our mechanics make house calls

Q: Decreased Consistent Acceleration on freeway

asked by on

I bought my '94 Mercury Topaz V4 Automatic about a month ago. I pulled the codes and it had a P158 for the MAF sensor. I replaced the MAF sensor, air filter, PCV​, and fuel filter. I was on the freeway today and I noticed it was making this exaggerated revving sound after 60 mph. Then it slowly and consistently lost speed. I immediately got off the freeway in time to coast into the gas station as it cut off. Then when I tried to restart it, it won't turn over. Help!

My car has 466339 miles.
My car has an automatic transmission.

Hi there:

Although it’s probably the worst case scenario, what you’re describing looks a lot like a timing belt issue. However, it’s also possible that an ignition system component like the coil or main relay might have also failed which caused this situation to happen to your Topaz. The only way to know for certain is to have a professional mobile mechanic complete a car is hard to start inspection, so they can pinpoint why this happened and recommend the right repairs.

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

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: Experiencing shift shock from 1-2 and a little from 2-3 when car is cold.

Hi there. It really depends on the terms of your purchase as to what I'd recommend. If the vehicle is under warranty then it's best to let the dealership make the repairs. However, if it's not, it would probably be...

Q: Gear shift lever?

Hello. The gear shift lever can become stuck in park for a variety of reasons. If one of the steering column components was not installed properly then that could be a possible reason as to why the vehicle is not...

Q: Strange noise while idle and worst when decelerating

Hello, thank you for writing in. The knocking noise from the video may be related to the new distributor that was installed. The distributor and timing can cause pre-ignition of the air-fuel mixture. This causes the rough idle and the...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...