How to install a spark ignitor in a gas furnace?

SOURCE: I have a problem with

Buy a new ignitor either from the ignitor store online, or your local distributer, Contracter, dealer.. they usually run from 15 dollars to 35. Their simple to change out and deffinite do it yourselfer... Oh and turn off power at breaker panel, you don't need any unexpected surprises!!

SOURCE: Goodman furnace wont light, ignitor suspected

Notice. I do not mind helping diagnose furnaces although I try to be cautious when giving advice on them. Please bare with me if I ask question. I don't want anyone burning their house down or hurting themselves and a furnace will do both.

You stated that you get a steady 4.9v then the fan turns off. Which fan are you speaking of? Also, the igniter should read 3.8 ohm's if it's good. The furnace should be sending 120 v to the igniter.
I'm not sure the igniter is the problem unit I receive a reply from question.

SOURCE: Trying to wire RUUD gas furnace. connection block

No problem have done this many times. R from the t-stat goes to R on the indoor unit. G goes to G Y goes to Y and C goes to C if you have a C or the t-stat the you are using. If there is no C there dont worry about it. It only need to be hookup if the t-stat uses power from the unit to run. Many t-stats today use battery power and do not need the C wire hooked up. Now R and C from the outdoor unit. R goes to the Y on the indoor unit and C goes to C on the indoor unit. That means that you may have two wires under the Y terminal and sometimes under the C terminal on the indoor unit. If on the outdoor unit there is no designation of R and C dont worry, just hook one wire to each of the two wires there for your low voltage connection. It does not matter which one goes to which unless they are marked then it may matter.
This should get you up and running and see it really isn't that hard!! :-)

Testimonial: "Thank you very much! I have been searching the inernet for hours to find a manual or diagram. Got a response within 15 minutes of posting. "

SOURCE: I have Rudd hot air

Hi, Check the flame sensor next to the pilot. It should be a ceramic rod with a metal tip that rests in the pilot flame. It may be dirty. Clean the tip with steel wool real good and make sure it is in the pilot flame good. This will cause that condition to happen. If this doesn't take care of it, get back to me and we will go from there. Should solve you're problem. Merry Christmas,
Shastalaker7

SOURCE: I have a Rudd furnace

Well first you want to verify that there is gas pressure coming from the connector. Turn off the valve and disconnect the connector. Then turn on the valve for 1 second and back off. You should get plenty of gas flow. Be careful doing this!. Then inspect the opening at the adapter to the control. There is a screen inside there. Make sure the screen is clear(not plugged with pipe dope,lint ect). When the igniter reaches the 2200 degrees you should hear the gas solenoid valve click open releasing gas. If you hear it click and no gas is released you will need to inspect the burner orfices. The orfice has an extremely small hole and there is a posibillity that they are plugged with debris. You will need to use a very small wire(like a tie strap) and insert it into each hole and see if there is anything in the orfice. If you do not hear the gas valve click then it might not be getting the signal it needs due to a weak igniter or flame rectification sensor. Does your furnace have a stand-by pilot that is lit by the hot surface igniter or does the igniter directly light the burner assembly?