Piston Slap: An Exedy-ous From Logical Clutching?

James writes:

Hi Sajeev,

I’ve got a 2003 Impreza WRX (blob-eye) that’s covered 96,000 km now. I bought it two years ago from the original owner, who seemed to take very good care of the car (every receipt since new). The car has been almost faultless.

About 4,000 km ago, at 92,000 km, the original clutch was clearly on its last legs. Under wide open throttle in 3rd gear, the clutch would slip and struggle to get power down. So off it went to a local WRX specialist to have the clutch replaced with a new kit: new pressure plate, machined flywheel and new Exedy OEM (standard, not heavy duty) replacement clutch.

However, when I got the car back, it felt completely wrong.

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Piston Slap: Start With Spark Plugs!

Done Duratec’d Out? (photo courtesy: Supaman)

TTAC Commentator Supaman writes:

Hi Sajeev,

Haven’t visited TTAC in a while but I’m back! My Mazda 6 has now crossed the 101k mileage marker and all your nuggets of wisdom have helped keep this classic functional and beautiful. However, there’s another problem rearing its head that has plagued even the Mazda forums I’ve visited for a resolution.

It involves the car’s driveability at anything below 3000 rpm. Doesn’t matter whether the engine is just warming up or at operational temperature, the car will hesitate (sometimes violently) in a stuttering/bucking fashion when accelerating from a stop through the gears until I crest that magic 3000 mark on the tach. Out on the highway, passing in top gear is almost impossible because of the engine’s hesitation if revs fall below that number, requiring a downshift to 4th to keep them up. At first I thought my manual skills were to question but then I never started experiencing this issue until around the 87,000 mile mark. It has since gotten worse. Sometimes the bucking is enough to trigger the CEL but then it always goes away after a while.

Browsing the forums I’ve tried everything from cleaning the MAF sensor, fuel injector cleaner, throttle body cleaning as well as replacing the O2 sensor. I’ve narrowed it down to either spark plugs (some forum members replaced theirs but the problem came back hours later), the coils or possibly a vacuum leak. One post I read indicated a potential cylinder misfire. Even Mazda dealers were confounded.

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Piston Slap: Crystal Ballin' With Yo Tranny! (Part II)

Aaron writes:

Hey Sajeev,

Huge fan of TTAC and the piston slap articles. My problem is that I noticed my car(2007 honda civic)would shudder, under light throttle and low rpms especially when going up a slight slope. This usually happens at 30km/hr or 40km/hr. I took it to the honda dealer(4 months ago) and he said the torque converter(tc) needs to be replaced(300 for tc plus 900 for labour and stuff).

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  • Beachy Asphalt only works to keep the dirt road below it dry, and it is the dry dirt that holds up the asphalt surface to make a smooth road surface. Once the asphalt cracks or a spring wells up and the dirt gets wet, all bets are off. It is usually due to a spring that perennial potholes form. They are very hard to get rid of.
  • JamesG I’m the owner of the featured car that’s currently on EBay. Thanks for such a nice write up on these cars. Mine happens to be in excellent condition and the photos don’t do it justice. The HT4100 isn’t as bad as some made them out to be and they can go 200k miles with proper maintenance. I also own a 79 w/the analog fuel injected 5.7 350 which should have been used through 1985 but ever-increasing CAFE regulations called for more economical power plants which made GM shelve this great motor.
  • Jeff S Adam on Rare Classic Cars recently bought a pristine 71 Kenosha Cadillac.https://www.youtube.com/watch?v=lY-G2dExgXE&ab_channel=RareClassicCars%26AutomotiveHistory
  • Jeff S Wouldn't most of the large suvs in NYC be livery vehicles? If so that would be hurting those who make their living by driving for hire.
  • EBFlex Yes their mass transit is great if you want to be beat within an inch of your life or pushed onto the tracks by some random psycho.