I'm looking at an 88 turbo II to buy, the miles on the engine are unknown. He estimated it at 60000+ I have a copy of the compression test which i'm going to try to post. What are good compression numbers? Also seller says that it needs a new TPS and the injectors are possibly leaking. What does it cost to replace these parts? What are the symptoms when these parts are bad?

Thanks

 

Compression doesn't really look great. Right now from what I could tell you are slightly above min. on the rear. (not good) TPS on a 88 T2 should run ~$170? new and a LOT less used. The injectors are probably NOT leaking. It is probably the fuel pulsation dampner which runs ~$110. The other thing that COULD be leaking is the injector o-rings... which is ~$30, basically if you are going to take it all apart to do the pulsation dapner, then IMHO you might as well go ahead and replace the vacuum lines, injector o-rings, and fuel hose under the manifold as well. (Not a bad job once you get to it). Personally I would probably keep looking unless there is something SPECIAL about this car... (ie. great condition, price, etc...) BTW- All the prices that I listed did not include labor, which if you get it done at a competent shop will cost you probably $200 - $300...

Good luck,

 

looks like your side seals may be a bit dodgey, but 75psi aint too bad for a motor that has done a load of miles

 

the actual numbers dont mean anything you dont know if the engine was hot or cold, and you dont know the cranking rpm.
if anything the front rotor looks a bit tired, see how its slower to come up to compression. besides all a compression test tells you is that the engine is good right now, you dont know the condition of the water seals/cooling system or if the oil control rings are any good.

mike

 

Usually the rear rotor has lower compression than the front.

 

I agree with j9fd3s.The compression test should be performed at operating temperature,and corrections are made for cranking rpm and altitude.Typically cranking speed is 250 rpm or thereabouts,in Florida you must be close to sea level!Nicer numbers at standard conditions would be 7.5 all around.On a Mazda rebuild I have seen 8.0 all around.
As far as symptoms---leaky fuel injectors are most obvious when you try a hot start and it won't leaky injectors may contribute(also a sign of low compression),otherwise all you will see is somewhat higher fuel use and some lumpy running(unless one or more is stuck open).
Leaking fittings on the fuel system will be obvious--you can smell it!(Leaking pulsation damper appears to be a hot topic right now--I haven't had one in 21 car-years)
A bad TPS can show up in many ways depending on what and how bad--somethings to look for,poor idle,jerkiness going on and off throttle.

 

thanks for all the input.

 

Does that mean it's a good thing?