#TuneUp

TTAC commentator VolandoBajo writes:

Sajeev, my worthy and esteemed fellow Panther defender,

I acquired my ’97 Mercury Grand Marquis LS about six months ago and have enjoyed everything about it. I’m hoping to find a good source for a dual exhaust that doesn’t cost more than the book value of the car, and to convince my wife that the mileage increase will pay for the mod over time.

But my present problem is baseline fuel economy. I see repeated references to a 20 miles per gallon highway figure, but I can only manage 17 mpg at the best of times.

Joey writes:

Hello Sajeev,

I’ve been a reader of yours for years and greatly enjoy your style. (Woot! —SM)

My question is about my ’97 Mazda 626, with a hair over 215,000 miles on it, that’s been in my family for its entire life. It’s reliable, economical, and generally in good condition.

However, I am up for a registration renewal in October, and I need to complete an emissions test. I figured that it would be a good idea to check up on the codes behind the check engine light. The codes came up as an evaporative system and catalytic converter errors, which are both emissions fails.

But wait…there is less???

Sajeev writes:

As the Christmas Spirit draws near and Pistonheads relax with thoughts of good vehicular cheer…screw it, I’ll get to the point:

Can timing chain rattle on start-up magically resolve itself after a mere tune up?

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.

TTAC Commentator sundvl76 writes:

Sajeev,

Your post of 2 Mar 2011 was a great explanation regarding the cause of the “T” joint oil leak I’ve been experiencing. No one on any of the normal Ford sites has been able to pinpoint the problem, so I thank you for the information. (I’d discovered the source, but didn’t know the cause/fix until your post.) TTAC is now on my Favorites list!

Dennis writes:

Dear Sajeev,

I own an 06 Sonata with the 3.3. It is paid off and has 79,000 miles on it. I love this car.

Brian writes:

Hi Sajeev,

I have a 1999 Nissan Frontier. 207k miles, 2.4L four cylinder. I have a Service Engine light which comes on AFTER driving for 30 minutes, parking it and letting it sit for 30 minutes. When I come back and start the truck I get the vibration and Service Engine light. The code is a P0303, i.e. cylinder #3 misfire.

Clint writes:

I usually buy vehicles that need the timing belt replaced. (Most people trade in or sell at that point for $ reasons). I do most of the work myself because it’s not overly complicated if you follow a manual. People at my office ask me about general car maintenance. When I ask about timing belt changes they always respond with, “Do I need to change that?” or “I have never changed that.”