The Truth About Cars » DI http://www.thetruthaboutcars.com The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. Thu, 02 Jul 2015 14:00:27 +0000 en-US hourly 1 http://wordpress.org/?v=4.2.2 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars no The Truth About Cars editors@ttac.com editors@ttac.com (The Truth About Cars) 2006-2009 The Truth About Cars The Truth About Cars » DI http://www.thetruthaboutcars.com/wp-content/themes/ttac-theme/images/logo.gif http://www.thetruthaboutcars.com Piston Slap: Oil Burning and Carbon Cleaning? http://www.thetruthaboutcars.com/2015/06/piston-slap-oil-burning-carbon-cleaning/ http://www.thetruthaboutcars.com/2015/06/piston-slap-oil-burning-carbon-cleaning/#comments Tue, 09 Jun 2015 11:00:53 +0000 http://www.thetruthaboutcars.com/?p=1085625   Arley writes: Sajeev, I have a 2003 Jetta TDI with 178k miles. Runs 100%. My mechanic recommends a carbon cleaning. What are the positives and negatives? To be more succinct, what can go wrong? You can tune a piano but you can’t tuna fish. (Good to know! – SM) Sajeev answers: Conventional wisdom (for […]

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Looks legit. (photo courtesy: n0str9 @ forums.tdiclub.com)

Arley writes:

Sajeev,

I have a 2003 Jetta TDI with 178k miles. Runs 100%. My mechanic recommends a carbon cleaning. What are the positives and negatives? To be more succinct, what can go wrong?

You can tune a piano but you can’t tuna fish. (Good to know! – SM)

Sajeev answers:

Conventional wisdom (for both diesel and gas engines) is carbon buildup occurs more often when the owner subjects the engine to excessive idling and a severe lack of full throttle acceleration. Today’s direct injected, EGR equipped diesels (and direct injected gas engines lacking a piggyback port-EFI setup a la Toyota V6s) are sensitive to carbon buildup due to idle time, EGR design and cooling system inadequacies, and perhaps even fuel (i.e. varying quality of bio diesel). Don’t take my word, this company’s blog did a good job assessing the problem.

Whew!

So carbon cleaning is commonplace and a good idea. And be it a seafoam-alike treatment or physical removal/cleaning of critical parts, there’s no downside if performed with even a modicum of care.

Question is, do YOU have a problem? 

Considering your mileage (less idling and more highway driving?) and engine performance: probably not. Watch this video (go to 1:39) and DIY if you are even the least bit handy. From the video, make a trip to the parts store for vacuum lines too!

Or just do nothing aside from performing an Italian Tune-Up. That’d work for sure, and it’s totally fun.

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.

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Piston Slap: Inject Fuel Directly into…Oil? http://www.thetruthaboutcars.com/2013/07/piston-slap-inject-fuel-directly-into-oil/ http://www.thetruthaboutcars.com/2013/07/piston-slap-inject-fuel-directly-into-oil/#comments Mon, 29 Jul 2013 12:49:21 +0000 http://www.thetruthaboutcars.com/?p=497213 Evan writes: Sajeev, I have a piston slap question for a friend at work. She drives an ’11 Mazda CX-7 2.3. For over a year she has had an issue with fuel in the oil. Enough that the oil level has been as much as 1″ above the full mark on the dipstick as a […]

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Evan writes:

Sajeev,

I have a piston slap question for a friend at work. She drives an ’11 Mazda CX-7 2.3. For over a year she has had an issue with fuel in the oil. Enough that the oil level has been as much as 1″ above the full mark on the dipstick as a result (oil level was checked after service, and frequently between services). This is noticed within weeks of service/oil change.

The issue seems to be worse with more short trips, and the car has been serviced as recommended by Mazda (or more frequent oil changes when warranty fixes attempted). The dealer has had the car repeatedly over the last year, and now continuously for over 2 months. They have replaced the HPFP 6 times as well as replacing the injectors twice. Leakdown and compression tests show no issues. Canada has no lemon law (just horrible binding arbitration), or the car would probably be a buyback by now.

The dealer has spent over 13k in repairs trying to fix it. They are at a loss, and Mazda forums haven’t helped, so I come to you and the B&B hat in hand. Also, even if they can fix it how much damage will so much fuel dilution cause? Should they demand and reasonably expect some sort of engine warranty extension?

Sajeev answers:

I am totally bummed to hear about your lack of Lemon Law-ing ability in this case.  O, Canada! 

I would seek more information on arbitration and contact Mazda Canada formally (AND via Social Media) to see if they’ll do anything. Sell this Mazda after the (possible extended engine) warranty expires…unless you’re thinking what I am thinking.  Ya know, an LS4 swap.

Mmm, LS4-FTW…that would be so awesome.

(cue harp strings, dream sequence) 

ls4shirtfinal

OH YEAH!  Front wheel drive…with BALLS!  Zoom-ZOOM-Zoom!

Ahem, now where were we?

Finding conclusive information on why fuel-oil dilution exists is tough via Google, but this SAE paper might contain the truth. Too bad I’m too cheap to buy it, too lazy to read and summarize for everyone’s benefit. Maybe some engineers with active SAE memberships can chime in here?

What say you, Best and Brightest?  Time to get a lawyer?

 

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.

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