arie1955

I fear my motor is blown. It runs, but is pulling only like 4-6 psi Vacuum at idle. When it ran correctly, it was like 14-16. Could this be a vacuum line problem, or a pure motor problem (apex seal or something). I would love any help or answers before I consider the motor Dead.

EricM

Check if the line to your MAP sensor is connected

ejmack1

Hmmm, so since you didn't explain, I am taking it that the motor runs fine, and you are just seeing low vacuum correct?

arie1955

yes, extremely low vacuum, the car will start and run, and if you go under boost, will still pull hard. I am just at a loss, happened when I was going about 80 down the Grand Central Parkway on a sunday morning to work, all off a sudden, had high end bog, and then the vacuum problem showed up. I am afraid to take to a local mazda RX7 shop, becuase they will probably tell me the motor is gone without even doing anything if I leave them the car. Can this really be a vacuum problem?

arie1955

also, and becuase the vacuum is soo low, the car has a lump lump sound at idle

maxcooper

If the MAP sensor hose is still connected, it is almost certain that you need an engine rebuild. Lumpy idle and low and jumpy vacuum are sure signs of a broken seal. The car may still run fine once the revs are up; I ran a 13.3 @ 108 with two broken apex seals once.

-Max

arie1955

I will check tommorow at the shop, thats where the car is, the MAP sensor is the one on the firewall at the top next to the TB, right?

skunks

its in/hg btw, but in anycase, what is your idle at?

arie1955

MAP Sensor connected, #'s above are in Lbs (autometer gauge), the car will idle around 950 if warmed up

RX-187

Just out of curiousity (nothing related to particular problem) how many miles do you have on your engine?