low compression problem

[luigisho]

Thats a good question....I havent tried unplugging the MAF, I will though....should I unplug it before i start it or after, or does it matter?

I don't think it matters as it should revert to the default program setting. I would do it before I started it up.

 

[Mr Anonymous]

I am, but most threads could have been answered by simply doing a search.

You're right they can, but that's really not something for YOU to worry about. If you don't have something helpful to add to a thread, just don't reply. Replies like yours are a far bigger problem than a lack of usage of the search function.

im just concerned about the cylinder balance test that says # 3 cylinder...hoping its just a wire

As suggested above, perform a real compression test. The cylinder balance test may be detecting an injector or spark problem, and it's not really a reliable indication of cylinder compression.

The EGR is fairly new without alot of carbon buildup, I cleaned the EGR port through the intake and still the car throws 332

Replace the DPFE sensor. If it's an ATX, it's the box that sits on the back of the intake.

EGR valves almost never fail. 99.9% of EGR codes can be blamed on either clogged EGR passages or a failed DPFE sensor. If you have cleaned the EGR nostrils in the intake as you say, then as suggested by SeanMc replacing the DPFE sensor would be the next logical step.

 

[benjammin]

Thanks everyone for all the good input...I unplugged the MAF and the idle was erratic, jumping between 750 and 1000 RPMs. Im kind of confused though because ive read in other posts (by using the search function) that the easiest way to check if its the sensor is to pull the vaccuum line from the EGR and plug it, and if the idle gets better it is the sensor. Well ive done that and there was no change whatsoever in the idle. The valve itself is fairly clean, and if they dont often go bad then im wondering if my whole problem could be bad spark. Someone said to spray water on the wire in the dark to see if theres spark....so do i pull the wire spray it down and just crank the engine?

 

[jsj123]

Rubydist said:

I would disagree and say that low compression is not uncommon, and in my experience its often due to sticky rings because people don't change the oil regularly enough. In some cases I've saved them by using SeaFoam and a good synthetic oil with lots of detergent

I assume I can get the seafoam at a local auto parts store, but what brand of oil has lots of detergents?

--Stephen