I have an '87 Toyota Corolla FX16 with the 4AGE DOHC engine, and fuel injection. It’s a long time piddle project. I think I’ve had the car for 14 years. Not so long ago, mileage wise, I had the engine rebuilt w/30 over higher compression pistons. The shop gave me back an assembled short block, and I installed all the rest of the stuff. The car seemed to run OK, but due to having to swap out the
(broken) correct transmission for one that would fit, I got a large change in gear ratios. 80 mph used to be 4k. With the new transmission it was 3.2k. Brought the mileage up from 30 to 36 mpg, but that is not the point of the car. It’s intended to be a fun toy. I noticed the plugs getting a carbon coat. Over the course of the years I acquired a pair of Tomei cams and some higher volume injectors. I assembled these into a spare head (you would not believe the amount of spare parts I have). I finally located a correct close-ratio transmission. I assembled it with the new transmission and the new head. I used a three layer steel head gasket, torqued it down in three passes, waited 15 minutes and torqued it again. It ran great for about 50 miles, and then rough and then no start. I checked compression. 1,3 and 4 had about 90#. 2 had 150#. Stock compression is 185#. I checked the timing most carefully- the marks on the crank pulley and the key on the crank, the knock marks on the cams, the tension of the belt. Same results on retest. I dribbled some oil in the cylinders and got 1-185, 2-300, 3-185, 4-185. Can anybody give me a reasonable reason for these results other than cylinder/piston/ring problem?
This is a long post. I apologize, but I tried to put in all facts I believed pertinent. Thanks for your thoughts.