Hello all this may be in here some place I did a search but did not find it.

I have a 1997 f250 5.4L I need to do a compression test. But I can not seem to find a compression test adapter that will reach the spark plug threads.

This is an unmodified 5.4L with no issues with plug blow out. so the heads are still stock.

I would like to purchase a long test adapter but all I am able to find if for 2003 and above test adapters. will they work or is there one that others have used. I cant afford Snap on.

Just a note on issue. Misfire on CYL8
truck runs fine when cold but shimmies and shakes when it warms up. at all speeds except when I hammer the gas.

I know I can just just swap the coil pack and see if it moves but I would like to do a compression test since the truck as 233k miles on it runs fine till warmed up. and Plenty O power when I put my foot in it.

 

standard 14x1.25 will not reach the threads in the hole. I have tryed. It needs to be a long reach adapter. But i want to make sure i get the correct one as not to damage the threads and also not penitrate in to the cyl and posible damage the top of the pistion when i do a compression test.