Compression


ItsA5Spd

ItsA5Spd

15+ Year Member

Joined
Sep 16, 2008
Messages
79
Points
3,101
City
Harrisburg, PA
Vehicle Year
1996
Transmission
Manual
Hi all, I'm going to to a compression test here soon and want to know what kind of PSI I should be lookin for. I think that it should be in the 110-130 PSI range, is that right? any help is great. Thanks!!:icon_thumby:
 
more important than the actual number is the ratio between the cylinders. you want all cylinders to be within 30-40 PSI or so of each other. if you have a lot of variation between cylinders, or one cylinder is much lower than the rest, you have a problem.
 
You do want some pressure. I like 120 and above. Readings between cylinders should be within 15% of each other.

Take the readings with the engine warm. All plugs out, and disconnect the electrical connection to the fuel injectors. Turn the engine at least 4 revolutions.:)shady
 
OK, thanks guys. Oh, where is the connection for the injectors? Also, will parts off of a 93 STX fit my truck?
 
just hold the gas pedal to the floor while you crank it. this will cut the injectors and supply the cylinders with more air to compress (give you a better reading).
 
Wicked_Sludge said:
just the spark plugs to keep the engine from trying to start.
Click to expand...

Right, I knew that. OK sounds good, I'm gonna do it here soon. One quick question what is the biggest tire I can fit stock and the biggest tire if I level it? Thanks:icon_twisted:
 
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