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View Full Version : Misfiring and Knocking-- Compression Results, Please help?

RShotl
January 24th, 2007, 17:12
I have been trying to fix my 1996 Jeep Cherokee sport, 4.0L 4x4 w/ 118K miles. I hope to god this car isn't dead because I am broke and need to get to school 20 miles away and I have no one to get rides from.
So far done the wires, spark plugs, distributor cap, rotor ignition, put in a new fuel injector where I thought I needed it. I pulled all the injectors and let them sit in cleaner over night. The new injector and cleaning all of them seemed to improve the driving a bit, but still knocks around when first applying gas/idle speeds mainly-- but some higher.
Anyways... just ran compression test... seems like bad news? What does this tell me??? Am I in trouble? Can this be causing the misfiring/knocking? Please any information you may have to help. I will be so happy if I can get this Jeep running : #1 - 120 then added some oil let it sit for a few minutes --> 140 #2- 150 #3- 150 #4- 160 #5- 160 #6-160
FatXJ
January 24th, 2007, 17:32
It is common for it to be lower on the #1 due to many factors which I will not go into right now.

The main thing is which injector did you replace? It looks like the #1 has a leaky injector and is washing down the cylinder.
RShotl
January 24th, 2007, 17:43
It is common for it to be lower on the #1 due to many factors which I will not go into right now.

The main thing is which injector did you replace? It looks like the #1 has a leaky injector and is washing down the cylinder. I replaced the 1st cylinder's fuel injector very recently, within the last 50 miles. So what do you think is up with the compression results? What am I up against here?
RShotl
January 24th, 2007, 18:06
I just went out there again and now that first cylinder that I gave oil is reading 150....... Hmmm, seems compression checks out fine-- I should move on to other things or not??
RShotl
January 25th, 2007, 07:06
anyone?
Dr. Dyno
January 25th, 2007, 08:49
How's the oil pressure when the engine's hot?
RShotl
January 25th, 2007, 10:25
How's the oil pressure when the engine's hot? Oil pressure is 60++ to 70 or so?
RShotl
January 25th, 2007, 16:56
any help please???
Flash
January 25th, 2007, 20:15
Have you tried the the premium (hi octane fuel 91) if that makes the knock go a way then it time...........for a ROAD TRIP:variety: or you need some kind of upper cylinder cleaner to get the carbon out of the cylinder.

If that don't make the knock go a way:dunno:

can ya make it Knock when idling or revving it up in neutral?

Flash.