Code issues HELP!

I''ve gone to the experts and they arent helping. I have a 2008 Mazda 5. Codes are reading a lean engine condition.

History: Car went thru a hydrolock condition(not covered under warranty of course). We replaced 2 piston sets and engine runs beautiful. After a few minutes check engine comes on, codes are 2177,2187,2097,2195. Mazda says they dont know what the codes are and recommend replacing PCU, but cant say positively if thats the problem.(I think they''re just shooting in the dark) Had an independent specialist for code issues come look at it at my place, he could not tell me what part the codes were for either. Codes will clear but come back.

HELP IN ORLANDO!

thanks...

Do you have an aftermarket intake on it? If so, put the stock setup back on, clean the maf and clear the codes then see what happens.

Might also have a bad o2 sensor.

Does the van run fine?

I looked up the codes in my 2006 Workshop Manual, like you said, they are all Lean Condition codes.

Before replacing PCU, I would start by looking at o2 sensors as rodslinger suggested.

I imagine if it was hydrolocked, it might have damaged the front o2 sensor.

Codes suggest fuel line pressure, air leak into the exhaust before the o2 sensor, faulty o2 sensor, faulty PCU.

What is "hydrolocked"?

Rocket said:

What is "hydrolocked"?

Click to expand...

Hydrolocked is a term applied to the action of the engine trying to compress water instead of air in the piston and cylinder. Water can not compress like air, therefore the piston is locked in the cylinder, while the crankshaft and rods will still try to rotate. Damage can occur to the piston, rods, valves, etc.

This is caused by sucking water into the engine, instead of air, through the intake, or can also occur with a bad headgasket leak.

From the wikipedia:
Hydrolock (short for either hydraulic lock or hydrostatic lock) is a condition of an internal combustion engine in which an incompressible liquid has been introduced into its cylinder(s), resulting in the immobilization of the engine's pistons. The liquid causing this malfunction is often water, hence the prefix "hydro-". Hydrolock occurs in a 4-stroke engine when liquid is sucked into the engine's cylinder(s) during the intake stroke and, due to the incompressibility of the liquid, makes the compression stroke impossible. This, in turn, prevents the entire engine from turning, and can cause significant engine damage if one attempts to forcibly turn over or start the engine. Typically, connecting rods will be bent, making the engine uneconomical to repair.