4AFE help

[spike49]

I have a 1993 4afe engine. it runs in three cylinders 1-strong 2-nothing 3-strong 4-not as strong when the engine is running I can pull plug wires from the 1 cylinder it stalls 2 cylinder no change 3 cylinder stalls 4 cylinder not much change -a little weaker I have spark at all 4 cylinders compression at all four and fuel at all four could it be the distributer or coil? has anyone had a similar problem that could please enlighten me all suggestions are appreciated thank you

[fredk]

try switching the plug wires on the 2 dead ones

[hatchy_gt-s]

check the rotor and cap for wear do you know when it was last replace?
check for proper compression (149psi for example)

[spike49]

I've tried changing plug wires around used a known good wire still no change I,ve also changed the cap and rotor I've used the spark plug from one of the good cylinders no change wire from good cylinder no change fuel injector from a good cylinder no change this is why I wonder if it is a pickup coil or something like that every other cylinder is good if I remember correctly the two cylinders that don't work are in order in firing order 1 and 3 work 2 doesn't work at all and 4 is weak I will check the compression in the cylinders looking for 149 still any comments or suggestions are appreciated

[Pineapple]

Connect a spark plug to the wire. Touch the outside of plug to chassis ground. you can have all 4 four out so you don't do it one at a time. Crank the engine and look for spark. It may not be spark problem.

[spike49]

I have spark looks the same as the other cylinders still haven't checked for a compression reading I know that there is compression- spark plug in wire sitting in hole started the engine and blew the spark plug in the air bounced off hood with a degree of force

[Pineapple]

So you may have injector problem. Either injector is plugged, bad or wire is lose.

[spike49]

I have changed the injector with an injector from a good cylinder good cylinder stays good bad cylinder stays bad there is fuel to the cylinder any other thoughts arre appreciated

[fredk]

are all 4 plugs the same color?

[Pineapple]

Looks like bad wire on 2-4 injector. Engine is batch fire and I believe 2-4 fire at same time.

[spike49]

good cylinders 1-3 redish tint to plugs 2-4 black plugs

[spike49]

thank you for the idea do I just check the yellow wire for continuity? I will look in my book and see if it tells me what to do or how to check the wiring I am hopefull

[spike49]

by batch-fire do you mean that one wire fires in this instance two injectors a second wire does the other two?

[fredk]

try new plugs

[spike49]

Originally Posted by fredk

try new plugs

i tried new ecu 2 cylinder still weak backfires a little when 2 wire removed stops backfiring if I pull 1 or 4 wire stalls spark at all wires