1993 s-10 missing real bad

[cadillac_bn]

i have a 1993 s-10 with a 2.5 4 cylinder it is missing real bad i can pull the 2 middle plug wires off and it doesn't change anything so pretty much i'm only running on 2 cylinders i put new wires,plugs,cap,rotor,air filter,breather filter and pcv valve and that did not change anything but i am getting spark to all cylinders i've checked that i've also tried turning the distributer and that didn't help either it ran verry good up untill that point i just cant figure it out if anyone has any sugestions please let me know i'll try anything to get her goin again!!!!!! please help me!!!!

[DAB77]

first thing you need to do is a compression test on all cylinders. if you don't have a compression gauge you can rent one pretty cheap at most parts stores. if you have good compression and you have spark at all the cylinders and assuming you have 4 separate injectors, switch the injectors and see if your miss moves with them.try that and post what you have.

[cadillac_bn]

hey thanks for the reply i'm gonna do a compresion test on it today or tomorow but its carberated so i don't have any injectors. any other sugestions before i do a compresion test on it? thanks

[Chris Stewart]

It has a Throttle Body Fuel Injection...looks like a carburetor though.
I had the same motor in a 1986 Cutlass Ciera....it's the Pontiac 151cu.in.
Iron Duke motor, tough piece.
You might look at the sparkplugs on the middle cylinders to see if they're fouled or not.

[cadillac_bn]

i just put new plugs in it and drove it bout 3 days and the 2 inside ones are realy carboned up but the 2 outside pones are burning pretty good someone told me that he thinks my valves are bad and how do i switch my injectors?

[Chris Stewart]

You have 1 injector body and they're pretty reliable.
Is the air filter oily?

[cadillac_bn]

it was but i replaced that the breather filter and the pcv valve and the air filter was only about 8 months old