Low Compression in Cylinder #2

[Vengence]

This kind of goes along with my other post.....

When my Engine was misfiring (P0302) My mechanic and I both thought it could be spark plugs, wires, and coil pack.....All Replaced.

However, after driving for a while the Code came on while I was driving. Indicating something worse than just ignition misfiring......

After a compression test, my mechanic said that Cylinders 1, 3 and 4 had 180PSI and Cylinder #2 only had 100PSI.

Thing is, He mentioned that we may have to send the head in to be inspected/repaired if it is the head or maybe valve and valve rings.

Thoughts? Comments? I do not know what to do at this point.

[NitroPT]

*A proper compression test followed by a leakdown test will confirm if it is head or block related without having to remove the head.
You can also scope the cylinder to check for glaze or anything that is out of normal.

Honestly I would redue the *compression test based on your results claimed? And then consider my other suggestions.

[chuzz]

Hmmmm, I know what I would try, but I'm an old shade tree hack that only works on his own stuff for 45 years. Back in the old days of carburetors, if I ran into a situation like that, I'd suspect a little carbon might be holding the exhaust valve open. I'd take about 8 oz. of tap water, remove the air breather from the carb and trickle water down it with the engine running. The trick is to keep it running while trickling the water in. The water helps bust up any carbon deposits on the valves and even on the pistons. I've done this with throttle bodies too. Just remember, if you try it, there's no guaranteed it will work. You MIGHT just have a burned valve.

[NitroPT]

Don't I have pictures of doing this to my PT Cruiser some years ago?? I am pretty sure they are around somewhere?

Water injection is not old school!




Charlie the problem with the first responses is the posted results. I am not sure what is mention of "my other post" is suppose means? If he had another thread about this issue maybe it should be referenced in a http?

[Vengence]

Just so you all know, the injector and engine were cleaned using a carbon cleaner and it ran fine for a about 6 hours. Then the code came up while i was driving home. So it has been cleaned but i will tell my mechanc to do a dry/wet compression test.

[Imakenocents]

I'm with Nitro Pt on this one, a leak down test would also be my recommendation. It will zero in on the problem area.

[NitroPT]

Originally Posted by Vengence

Just so you all know, the injector and engine were cleaned using a carbon cleaner and it ran fine for a about 6 hours. Then the code came up while i was driving home. So it has been cleaned but i will tell my mechanic to do a dry/wet compression test.

If an engine does have a carbon issue there is very few automotive retailed products with specific claims regarding varnish and carbon that will remove any amount of either in a single application if there is already a verified problem with either.

Water used correctly through the intake system will remove more in a single application for carbon issues than most any automotive internal intake combustion cleaner chemical.

A leak down test in this case will be more productive than a wet/dry compression test. But I suppose at this point more information may be helpful to guessing (poking fun @) the problem your mechanic can't figure out in the physical diagnostic work on your PT Cruiser.

[Vengence]

Mechanic did that and heard air leaking through the exhaust area. So there is a leak somewhere but atill unknown if its a valve or the head gasket.

[ptcruisersteve]

Originally Posted by NitroPT

Don't I have pictures of doing this to my PT Cruiser some years ago?? I am pretty sure they are around somewhere?

Water injection is not old school!




Charlie the problem with the first responses is the posted results. I am not sure what is mention of "my other post" is suppose means? If he had another thread about this issue maybe it should be referenced in a http?

NitroPT, you have some nice pictures performing a water combustion cleaning on your own PT in the link below.
DECARBONIZING ENGINE WITH WATER

[Vengence]

Originally Posted by NitroPT

Don't I have pictures of doing this to my PT Cruiser some years ago?? I am pretty sure they are around somewhere?

Water injection is not old school!




Charlie the problem with the first responses is the posted results. I am not sure what is mention of "my other post" is suppose means? If he had another thread about this issue maybe it should be referenced in a http?

My other Post being New Cruiser, Odd Issue. Link Below this.
New Cruiser- Odd Issue

Couple things, Not 100% nor assured by mechanic, but I am almost positive that it is not an issue with the Head Gasket. Why? 1. No Oil leaking anywhere and 2. No oil in the coolant. Also, I think it is just an Air Leak somewhere or Vacuum Leak. Hearing air somewhere in the engine area/exhaust area is a clear sign of a air leak. However, not positive on that and it very well may be in the valve area, maybe a valve being stuck partially open due to build-up. (Possibly unlikely as my mechanic did a Engine Carbon Cleaning before the code came up last, but may have still been some left, idk)

However, At this point, My mechanic no longer has the PT......The Dealer who I bought it from does for him to look into, diagnose and more than likely repair on his dime not mine as I have only had a damn month with this bullshit. (Am I pissed off? Hell to the yeah!) Update you guys further as more info comes in but please do not stop commenting possibilities or correct any information I stated previously in this reply.