Piston Slap: A Rather Thirsty Escort?

Sajeev Mehta
by Sajeev Mehta

TTAC Commentator Weltron writes:

Hi Sajeev!

The car I am writing about today is my winter beater, which is a 1999 Ford Escort SE sedan which says it has a tick over 155,000 miles. The problem I’m having with it is it it getting dreadful gas mileage. My average tank is about 19 miles to the gallon (in comparison that is what my twin turbo straight six Volvo gets around town). Over the winter I replaced both of the o2 sensors and got a marginal improvement (about .4 mpg).

And here’s the kicker: the dumb thing runs perfectly. No error codes or anything. Idles smooth and everything (well as far as Escort refinement goes). When I go on the highway (which is fairly often) I can see upward of 21… If I’m lucky.

Help please! I’m debating on whether to sell it or not due to this gas mileage problem for something bigger (thinking an Oldsmobile Eighty Eight/LSS or if I’m feeling lucky … an Aurora if I do end up replacing the Escort.) Thank you in advance for your help.

P.S. Here’s a list of what has been replaced/cleaned since the fall.

Mass air flow sensor cleaned


New air filter


New spark plugs/ plug wires


New o2 sensors (both upstream and downstream)


New muffler


New tires

Sajeev answers:

It’s funny how well-maintained vehicles occasionally have an obvious problem that’s impossible to diagnose. But going to the beautiful, enjoyable yet expensive and complicated Northstar powered Oldsmobile is the wrong move!

You’ve done the basics, kudos to you. That makes our job easier. Considering your Volvo drives in the same manner (presumably) there’s certainly a minor problem outside of driver error. And I wouldn’t be so adamant if it didn’t happen to me:

Try changing the fuel filter first, then get new/reconditioned fuel injectors.

That’s it. I know you’ve slooooowly been losing power and efficiency. Perhaps you notice a mysterious fuel smell? The injectors are no longer turning on/shutting off correctly. And when you get ’em installed, ZOMG SON, note the instant acceleration improvement and the later MPG lift.

So go ahead and keep it, even if the cylinder head might be a problem in the future.

[Image: Shutterstock user Chill Chillz]

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.

Sajeev Mehta
Sajeev Mehta

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  • Beerboy12 Beerboy12 on Jul 28, 2014

    I would have suspected a fuel leak in the return lines. Cold weather plus a short commute would definitely return bad MPG to. A faulty thermostat that does not block water from the motor in the warm up faze could add to the problem to. Basically the engine block and oil never get to running temp. so the car is running on it's electronic little "choke" all the time.

  • Chicagoland Chicagoland on Jul 29, 2014

    I had 2000 Scort for a beater and had the thermostat replaced, and that helped mileage. But I also agree with fuel filter and injectors. It's 15 years old, so age wears a motor out also.

  • Dartdude The bottom line is that in the new America coming the elites don't want you and me to own cars. They are going to make building cars so expensive that the will only be for the very rich and connected. You will eat bugs and ride the bus and live in a 500sq-ft. apartment and like it. HUD wants to quit giving federal for any development for single family homes and don't be surprised that FHA aren't going to give loans for single family homes in the very near future.
  • FreedMike This is before Cadillac styling went full scale nutty...and not particularly attractive, in my opinion.
  • JTiberius1701 Middle of April here in NE Ohio. And that can still be shaky. Also on my Fiesta ST, I use Michelin Pilot Sport A/S tires for the winter and Bridgestone Potenza for my summer tires. No issues at all.
  • TCowner We've had a 64.5 Mustang in the family for the past 40 years. It is all original, Rangoon Red coupe with 289 (one of the first instead of the 260), Rally Pac, 4-speed, factory air, every option. Always gets smiles and thumbs ups.
  • ToolGuy This might be a good option for my spouse when it becomes available -- thought about reserving one but the $500 deposit is a little too serious. Oh sorry, that was the Volvo EX30, not the Mustang. Is Volvo part of Ford? Is the Mustang an EV? I'm so confused.
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