Main Relay

[Jmells93]

This might b a real dumb question but would the main relay b the reason a cylinder wont fire because of lack of fuel to that injector?

[BLUBB2]

So are you saying you have a dead cylinder?

[visualpoet]

The main relay will not keep one cylinder from firing. ALl four, but not one. Are you getting spark at that cylinder? Fuel? It's easier to help you out if you give us more information.

[deevergote]

The main relay simply turns the fuel pump on. That's it. If only one cylinder is getting no fuel, then you have another issue. Most likely the injector or the wiring going to it.

[Jmells93]

i have spark, i did a compression test and everything seemed good, and i can hear the injector clicking which leads me to believe that it is working.... the car will run on 3 cylinders and of course wen i pull the no.1 spark plug nothing happens to the idle and wen i gets up to operating temp u can really tell its only on 3 cylinders

[deevergote]

In that case, it sounds like there's something wrong between the distributor cap and the spark plug.

Replace the cap, replace the rotor, replace the wires (NGK or Sumitomo are my suggestion... no need for "performance" wires, which can actually be worse), replace the spark plugs.

Another possible issue is that the injector could be clogged. It may be working mechanically, but not flowing any fuel. I would hit a junkyard and pick up a few injectors to try... or try swapping injectors between cylinders (if the dead cylinder changes with the injector, then the injector is your problem.)

[Tippey764]

If you mess with the injectors at all be prepared to buy new injector seals

[Jmells93]

i did that and still the same thing.... new cap, new rotor, new plugs, new wires... got new seals for the injector... i asked so many ppl that have a good knowdge of cars and still noone knows

[deevergote]

When swapping injectors, there was no change? Still the same dead cylinder?

[Jmells93]

Yeah.... but cud it b a dead cylinder since there is compression in there????