I almost purchased a Fd a couple of days ago but when I went to test drive it, the car would totally bog and stall at full throttel pass 3k rpm. The owner offered to have it fixed for free and brought it to a local shop and they said it was the oil pump. I wasn't quite convinced that the motor was in great condition so I had to pass this one up. Did I do the right thing? I was really looking forward to owning a Fd. Oh yeah the motor had 70,000 miles to it. Any advice and comments are aprreciated, thanks.

 

most normal local auto shops will not know the insides of an FD from there butt. doesn't sound liek an oil pump problem to me though.

 

How much did he want for it? And second question.. would it surge at all at 3k or so? If the price is right and its just surging I would pick it up..

 

yeah it would go past 3000k rpm but not at full throttel the owner said he was going to have the mazda dealership look at it and have it repaired and offered to hold it for me but I started having second thoughts on weather the motor was damaged. The exhaust also needed to be replaced, would it be safe to drive it 300+ miles back? The owner was asking 12k for it. 93 Rx-7 Touring Model

 

Tell him 10k and don't bother having mazda look at it. Then have it towed to your area. Chances are its fuel related, or ignition. How many miles on the car? I know you said 70k onthe engine.. but don't know if it was rebuilt.

 

If the oil metering pump is bad, the ecu will go into "limp home" mode and won't respond well to heavy throttle or rpm. The OMP is very expensive and is several hours of labor to replace.

If the OMP IS bad, it sounds like it may have been bad for a while. This MAY result in damage to the eccentric shaft and rotors, making a rebuild VERY expensive.

Just something to keep in mind.

 

Or it can be something as simple as a vacuum/boost leak - like when MAP sensor is disconnected.

 

Rotary wisdom at it's best!

 

The problem could be something as simple as a fuel filter. The 02 sensor will tell you this. Just connect a volt meter to the 02 and ground. Put the meter on dc volts and use the 2 volt scale. Heat up the engine and make sure the sensor works by snapping the throttle. It should read between .1 and .9 volts. When its nailed it should be around .9 or so. An engine starving for fuel and showing as you say will read real low maybe .2 surely under .6 volt. This is a real easy test. The main thing is to hold the throttle down long enough to get a clean reading. I would also if the 02 test passes look at the exhaust system for a restriction. Sharp sounding leaks in front of the cat are also common with a restricted exhaust.

 

you could see if the car is in limp mode by pulling any available codes.