FIXED!!!!!-Smog failed due to EML light, did a drive cycle, now car is messing up!

[TerminatorX5]

would a bad fuel pump be part of the original issues with the car?

in other words, can all (or part of) the original symptoms (short of the broken DISA pin) be attributed to a bad fuel pump, or fuel filter?

[upallnight]

Originally Posted by TerminatorX5

would a bad fuel pump be part of the original issues with the car?

in other words, can all (or part of) the original symptoms (short of the broken DISA pin) be attributed to a bad fuel pump, or fuel filter?

A weak fuel pump may not be able to deliver the fuel at the design pressure so less fuel will be injected into the engine and the computer will view that as a lean condition hence the p0171 and p0174 codes.

[diddy0071]

So is the fuel filter a bitch to change and what tools will I need? I did the alternator on this baby, so if it is anything like that, I can handle it. I don't have clamps for fuel lines if those are needed.

[upallnight]

Only way to identify the problem is to perform a fuel pressure test at the fuel rail to determine what type of fuel pressure you have. If the fuel pressure is low or non existence you can replace the fuel filter since the OP doesn't know when the filter was replaced and if the fuel pressure is still low or non existence then it probably the fuel pump.

[upallnight]

Youtube video on replacing a fuel filter in an E46 which is similar to our E53 with the M54 engine.

https://www.youtube.com/watch?v=B4T_pVvXtps

And if you have to replace the fuel pump

https://www.youtube.com/watch?v=GMptYkzb2dU

[TerminatorX5]

Originally Posted by diddy0071

Like I stated, I took my vehicle to get smogged. It had been giving me a P0128 (Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) code for a few months now, and I hadn't gotten the time to replace the thermostat for it, but other than that, it was running good, I reset the code and took it in. The test passed all except the EML, as stated, I needed to do a drive cycle to get the system to reset. I did a drive cycle (2 minute idle, 3 minutes 20-30mph, 15 minutes 50-60, stop and idle for 5 minutes in gear) and I drove my car home no problems. A few hours later, I turned it on, and immediately knew something was wrong. The car was idling rough, and when I tried to take off, it lurched and started driving like a 15 year old learning stick. I parked it and left it overnight until this morning when I decided to start an inspection. I checked the oil, (it was low) and added what was needed. I checked the air filter (K&N oiled air filter) it looked clean. I turned it on, and still that rough idle. I took it for a quick drive around the block and it was just hesitating everywhere. I about wanted to cry at the frustration (this is my only vehicle for work, and I work tommorrow!). It gave me 3 codes and they are:

P0171
P0174
P0732

Why did they pop up all of a sudden? Did the fucker at the smog shop do something on purpose to fuck up my vehicle? I need help. I replaced the alternator on this a few months back, so if I have to tackle something in the engine, I will do it. I just want my car fixed, and ASAP. Any ideas friends? Please, help. I am desperate.

are these consistent with low fuel pressure?

DISA was faulty, that is a fact... could faulty DISA contribute to continuing of the symptoms?

I wish you had INPA to monitor live engine data... I am trying to remember from my car, if the INPA registers the fuel pressure - i know it displays mass and temp of the air...

it might not help you right now, but for future reference, once you are up and running, consider getting INPA and the rest of the software tools...

do we have any members with INPA who are close enough to diddy?

[upallnight]

Originally Posted by TerminatorX5

are these consistent with low fuel pressure?

DISA was faulty, that is a fact... could faulty DISA contribute to continuing of the symptoms?

I wish you had INPA to monitor live engine data... I am trying to remember from my car, if the INPA registers the fuel pressure - i know it displays mass and temp of the air...

it might not help you right now, but for future reference, once you are up and running, consider getting INPA and the rest of the software tools...

do we have any members with INPA who are close enough to diddy?

DISA will not contribute to a NO START problem, it does contribute to a driveability problem if it is not operating correctly since the whole purpose of the DISA valve is to vary the length of the intake runners.

More info can be found on this website:

BMW E46 330i M54 3.0L > Engine > Intake > ES#25793 Intake Air Adjustment Unit/DISA Valve - 11617544805

I would ditch the KN air filter and go back with the factory airbox. The KN filter doesn't make any more HP, but the oil from the filter does gum up the MAF.

Only thing the KN air filter do is you can hear the air being sucked into the engine AKA boy racers.

[diddy0071]

Originally Posted by upallnight

DISA will not contribute to a NO START problem, it does contribute to a driveability problem if it is not operating correctly since the whole purpose of the DISA valve is to vary the length of the intake runners.

I would ditch the KN air filter and go back with the factory airbox. The KN filter doesn't make any more HP, but the oil from the filter does gum up the MAF.

Only thing the KN air filter do is you can hear the air being sucked into the engine AKA boy racers.

The K&N was simply purchased so that I didn't have to always buy a new one. Simply clean and replace.

[TerminatorX5]

i am digging through the WDS - i suspect that something is unplugged, or has a poor connection... the onset of the symptoms just does not sit well with me... good thing upallnight pointed to DISA and that issue is resolved... but there is something more there... one of things i thought, that both MAFs, the OE and the aftermarket are not good, but the engine should be running with default values, and it does not... lets see if i WDS has anything to say...

[TerminatorX5]

is there a sure way to verify proper operation of DISA? like, listen to it? or watch it? could we still have something in that area that might be mulfunctioning or not correctly seated in a position?

this question is to the forum at large...