How do I replace my ignition coil on my 97 tahoe 5.7 v8

Hello,
Your question lists codes p305p, and p305, which are not valid codes. Did you mean P0305? This is a diagnostic code referring to a misfire on cylinder #5. It looks like you've replaced parts that could be causing a misfire, but did not fix the problem.

A simple check to verify your misfire is not being caused by an ignition coil (the 4.8 liter engine has a coil-near-plug system, with one coil for each spark plug) is to swap the suspect coil (cylinder #5) with a coil from a different cylinder on your engine.

Cylinder #5 is the third one back from the front of the engine on the driver side of the engine. After you swap coils between a good cylinder and #5 cylinder, clear the codes and see if the misfire followed the coil- if a misfire code sets on the cylinder you moved the cylinder #5 coil to, you know the coil has a problem. That will at least help you rule out the remainder of the ignition system.

To Remove......
1. Remove the spark plug wire from the ignition coil.
2. Disconnect the ignition coil electrical connector.
3. Remove ignition coil bolts.
4. Remove ignition coil.

To Install.....
1. Install ignition coil.
2. Install ignition coil bolts.
3. Tighten ignition coil bolts to 8 Nm the same as 71 inch pounds.
4. Connect ignition coil electrical connector.
5. And finally, install spark plug wire to ignition coil.

Could be an ignition switch. Could be coils or ignition module. Have the codes read.

1 - 3 - 7 - 2 - 6 - 5 - 4 - 8

It has the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils

The engine cylinder locations are numbered :

firewall

4 - 8

3 - 7

2 - 6

1 - 5

front of Ford F-150 ( V8 )

Check your coil pack. Sounds like one or two need replacing.

ignition control module!!

Hi, the cap, and rotor may be collecting moisture, or the ignition coil shorts out with moisture. You can spray these with a water bottle, while it is running, to find the concern. It lies in one of these ares. Make sure you inspect the coil wire as well. Good luck...Coop

i have a 97 Tahoe with 5.7 vortex it had weak spark at plug it would turn over well but not fire enough to start and would foul the plugs with gas if i removed the fuel pump relay and tried it would dry out enough to start i would replace relay and it would keep running had ignition mod checked ok replaced coil problem went away

I believe those motors have a distributorless ignition system. Each cylinder has a coil mounted on top of the valve cover.

Crank sensor has to be bad,or the ignition module.Remove the ignition module and have it checked at the parts store.If it checks bad,replace it,if it checks good replace the cranksensor.The cam sensor,cranksesor,and the control module control injector pulse,and coil spark.I would point more to the ignition module.But I have known the crankshaft sensor to do this also.I hope this was helpful,if so,let us know,thanks,and good luck.