1993 celica st

[spike49]

I have a 1993 st and have found an engine from a 93 gt will it just swap right in or is this a project that requires extensive work the st engine fires on three cylinders good compression on all four ecu is good dist. good could it be timing belt ive checked the injectors all spray suffeciently changed a good one to the none firing cylinder no change I am at my wits end. any help would be appreciated Thank You

[RobMilkshakes]

To use the GT engine it would require a fair bit of work. You would have to move an engine mount, swap the wiring harness, ECU, (i believe) the fuel pump, transmission, CV axles, hubs may(?) be different.

A timing belt wouldn't cause that. Usually its an ignition issue for why just one cylinder isn't firing.

[93celicaconv]

How did you check your injectors? Did you check each injector plugged into its own wiring connector? If you only used one wiring connector for testing all your injectors, then you haven't ruled out the wiring harness yet.

Which cylinder is dead? Did you check the spark plug for that cylinder? Did you check the high tension cable between the distributor and the spark plug on the dead cylinder?

I've had this problem many times on my 2 ST's, and a typical fault in the spark plug wire, where it goes down in the tube in the valve cover, starts arcing to the metal spark plug tube because of a crack in the spark plug wire casing down there. If you know when cylinder is dead, when the engine is running, just pull the spark plug wire off the spark plug, pull it up a little, but not out of the spark plug tube in the valve cover, and see if it arcs to the metal spark plug tube in the valve cover from somewhere other than the very bottom. If it arcs half way up the spark plug wire, then you know you have a bad wire. If you can just replace that wire, try that to see if the problem goes away. If you don't have a replacement wire handy, for a temporary test, just wrap the area of the spark plug wire where it is arcing with a few wraps of electrical tape. If this solves the problem, go get yourself a replacement wire set.

I carry an extra set of spark plug wires for my 2 ST's with the 4A-FE engines just because of this problem.

[spike49]

Originally Posted by 93celicaconv

How did you check your injectors? Did you check each injector plugged into its own wiring connector? If you only used one wiring connector for testing all your injectors, then you haven't ruled out the wiring harness yet.

Which cylinder is dead? Did you check the spark plug for that cylinder? Did you check the high tension cable between the distributor and the spark plug on the dead cylinder?

I've had this problem many times on my 2 ST's, and a typical fault in the spark plug wire, where it goes down in the tube in the valve cover, starts arcing to the metal spark plug tube because of a crack in the spark plug wire casing down there. If you know when cylinder is dead, when the engine is running, just pull the spark plug wire off the spark plug, pull it up a little, but not out of the spark plug tube in the valve cover, and see if it arcs to the metal spark plug tube in the valve cover from somewhere other than the very bottom. If it arcs half way up the spark plug wire, then you know you have a bad wire. If you can just replace that wire, try that to see if the problem goes away. If you don't have a replacement wire handy, for a temporary test, just wrap the area of the spark plug wire where it is arcing with a few wraps of electrical tape. If this solves the problem, go get yourself a replacement wire set.

I carry an extra set of spark plug wires for my 2 ST's with the 4A-FE engines just because of this problem.

I checked the injectors by swapping with a good firing cylinder good cylinder still good bad cylinder still bad

Ive replaced the spark plug wires the distributer cap comes with wires connected to it I will try the tape deal

It is the third cylinder

[93celicaconv]

If you already replaced the spark plug wires, and the same cylinder is dead, then no point in taping the spark plug wire casing that is down in the spark plug tube (I really doubt two different spark plug wires just happen to be defective).

Do you have an automotive stethoscope? If you don't, they are cheap and very helpful. Sears or most auto parts stores carry them. If you do, you should put the wand on each injector on the cylinders that you know are working - you should hear a very noticeable clicking noise meaning the injector solenoids are working. Then put it on #3 cylinder. If you hear clicking, then the wiring to the injector, and the injector solenoid, is working. If you don't hear clicking, but you know the injector works (because you swapped them around already), then there is a problem in the wiring going to the #3 injector.