Got a 1174 code and gas mileage went to crap. Thought it was the MAF or an intake leak. Cleaned MAF, found no issues.

Was about to start digging in when i found this cracked hose off of the crankcase breather, cut the end off, reattached, problem solved!!

Was also the mysterious oil spotting that I had not found in the last several months. Took about 30 mins start to finish...

Hope this helps someone else.


2003 MKIII with 150k Miles, still looks and runs like new!

 

sorry dude, but its time for new hoses and a new cyclone separator. the reason for the split is the cyclone separator goes bad and the hoses get chewy. You should replace the hoses that run to both the separator and underneath the intake. Trust me, you fix that hose and as soon as it gets really cold, the engine will blow the oil all over the back of the motor and you loose alot. Replaced all them this time of year.

best thing to do while you are at it is to replace the coolant passage cover underneath those two pipes. they leak as well. Remove all the hoses and replace the gaskets to the crosstube and the orings.

Trust me, the bmw guys will tell you the same thing.

 

and remove the metal hose they attach too and clean the crap out of it as well. thats the main part of the freezing

 

Oddly enough, that is the new hose. Did the hoses, the oil separator, and the coolant passage connections within the last 6 months...

It looked like either the clamp caught it too high on the nipple, or it was just a bad hose.

 

Hello I have a code p1174 to an I checked everything . Change spark plugs an wires thanks to blue water . I still have the code . I clean the maf sensor I thought I was ok . Reset everything an the dam light came back on an with the same code it running rough standing still . Please help guys thanks

 

A vacuum leak could do this, as it allows "un-metered" air to enter the intake manifold, and the calculations, based on the info from the clean MAF, are outside the correction limits of the fuel map adaptions. Imagine you have a bowling ball sitting on the floor of the garage. You put a piece of 4 foot by 4 foot plywood on top of the ball. You stand on the plywood, and balance. While juggling. This is what the ECU is doing with all the sensor inputs, trying to keep fuel/air mix at an ideal ratio. And when the plywood touches the floor on one edge you have reached the adaption limit.

PCV system hoses are always a prime suspect. You can spray some squirts of carb cleaner around the suspect area and listen for change in engine speed.

 

What year is your Range rover187? How many miles? This original post was for a '03, which doesnt really have ignition wires. I am going to guess we're talking 99-02. With just the 1174, and nothing with bank 1, unless it's just below the limit to set the code (you'll need a scanner with live data to tell you that), you're looking at a non-global fault, so the MAFS, and upper intake hoses shouldn't be the source of the problem. With it running rough at idle, it would need to be a pretty big vacuum leak, so probably not intake gasket. Could be looking at a partially clogged injector, bad O2 sensor, or incomplete combustion for any number of reasons.

 

hello i still having the code p1174 with 110,798 miles on her it a 03 dis2 se i have changed the plugs with nkgs and wires to the one disco mike mintion cleaned maf sensor checked for leaks none what so ever. what else could it be need info thanks