redtop only running on 3 cylinders ?

[Queenskid]

I just got my redtop sr20 in to my s14 but there's something wrong with it I went to a few places and they all said the same thing sounds like your only running on 3 cylinders so I changed all my injectors but that didn't help my question is how do I go about fixing this problem how much would it cost or is there something I can do my self to get my sr running right

[bruinbear714]

I just got my redtop sr20 in to my s14 but there's something wrong with it I went to a few places and they all said the same thing sounds like your only running on 3 cylinders so I changed all my injectors but that didn't help my question is how do I go about fixing this problem how much would it cost or is there something I can do my self to get my sr running right

The non-working cylinder is either 1) not getting fuel, or 2) not getting spark, or 3) has low compression.

you can check ignition to the cylinder by unplugging the coil to that cylinder to see if your engine responds.

[SillyRB]

1) make sure its getting spark, check the coils. Put a screwdriver or something to the injectors make sure its getting fuel2) Check to see if the ECU is throwing any codes (just to check) 3) Compression / leak down test

[Teamsprock]

First the easiest thing to do is look at the spark plugs and see if one of them looks different than the rest! If so figure out why that cylinder is different, Sprak, fuel or compression as everyone said. If they all look the same try the power balance test. Start by pulling each coil pack as suggested and see if anyone doesn't make a difference, if they all are fine try that with the injectors unclipping one at a time and see if the rpm's drop on all of them. If both of those check out then do a compression test. I would just do it cold so you don't dump anymore fuel in there if you have low compression. Other possibility is that you have an Injector o-ring leaking so its flooding one cylinder. Once you look at the plugs let us know what you find as that can help a lot to point to the problem, are the plugs new?