Am I being BSed by a dealership?

[TSGB]

Aside from a resounding "yes," I'm looking for a more specific answer.

I requested a leak-down pressure test on a 2004 Ranger with a 4.0. It blew just a little puff of blue when the salesman started it. According to their service department, 1997 and newer OBDII systems diagnose for that. Do they, and how? It seems like it would require a sensor on every cylinder to track compression.

 

[Cornfield creations]

On OBDII systems, they monitor misfire's through the crankshaft sensor. A drastic change in compression across cylinders can cause a improperly read misfire from the computer. They may be referring to that.

 

[496truck]

When you said "leakdown" they most likely thought you were talking about the evap system. Which it does self test.

You want an engine cylinder leakdown test which is an entirely different thing.

FWIW, I'd walk away from that one.

 

[sweetk30]

put the walking boots on and start walking as its a ranger and smokes .

 

[AJMBLAZER]

I'd buy another 4.0L Ranger in a heartbeat...but the smoking...nope. Someone mistreated it pretty bad for it to be doing that.


Tacoma > Frontier > Ranger > Dakota > S10 > Canyon/Colorado

However the Taco and the Frontier cost a ton and have high resale.

 

[cuervo]

Smoke at start up is valve guide seals, normally.

 

[mwood1985]

i had a 01 ranger. around 8 inches of lift 35s and i dogged the crap out of it in every mud hole in south georgia i could find and after 200,000 miles 3 transmissions 2 transfer cases and new diffs once the original motor still ran smooth as new. no smokes. if that ones smoking id be the first to tell you the motors hurting due to abuse and to pass on it