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  #1  
Old 05-06-2021, 12:23 PM
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New to X5 world, advice needed please (Cooling and fuel pump)

Hello Fellow Outposters!

I have been in the BMW world for a while, I've had my e46 for 3 years now, did all the work on it myself, Gaskets/seals, manual swapped, cooling overhaul, steering overhaul, electrical gremlin squashing, DME/LCM/TCU coding etc.

Recently I acquired an X5 (2006 4.4l N62 with 302k KM mileage) for my wife, I have done a fair share of research prior to the purchase and most of the critical engine issues were done, the coolant return in the valley pan was fixed with the bimmerfix stent, rear air suspension replaced, all the brake lines were replaced, most of the cooling components were fixed too, and NO SMOKEY EXHAUST!! (Valve stem seals were done too)

TL;DR: Is Delphi fuel pump good? And P/O used Delphi temp sensors, should I get OEM ones with the T-stat I am getting?

I am about to order a delphi fuel pump and Mann filter (The pump is whining and has 302k KM on it...). Seems to have outlasted any BMW pump I have ever seen... This is where I need the first set of advice, Is Delphi a good pump? FCP only have the Delphi or OE BMW which is almost double the price.

The next issue is an interesting one, the P/O did a somewhat cooling overhaul, water pump, hoses, 2 sensors, Expansion Tank, and one of the things on the list was the Dual temp sensor (13621703993) and the fan switch (13621433077, on the lower rad hose), the car is not reporting the correct temperature and seems as though it is not getting to temperature correctly (The fake gauge goes to HOT then comes back down in seconds), I have the thermostat in mind, and I will be replacing that (the P/O did not use OEM or OE parts. Both of the sensors are Delphi from Rock Auto.
The car is spitting out a code, P112B - Engine Coolant Temperature Sensor 1 Minimum Temperature Implausible, which tells me that the T-stat is stuck open along with the sensors not working.
When the code appears, if I power cycle the car, it will not crank the engine, until the code is reset. The car runs fantastic and there is no sign of over-heating.
Am I correct to say: I should get the 2 sensors listed above along with the T-Stat? or just the T-Stat?

(I use OBDFusion to read codes, no other issues are present, just the gauge being weird and the code popping up very randomly, I would use my INPA and/or Scanner 1.4 but I do not have access to them for a while)

Any and all advice is welcome, please don't tell me I am stupid for buying a 302k KM BMW, I know it will require work, I just want to learn the car, I love working on cars and I know they can be reliable with enough effort and money...

Thank you!
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  #2  
Old 05-06-2021, 02:14 PM
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Welcome to the world of E53s

I "like" to rescue beat down BMWs myself and my soon to be parted out E83 has 375k on it and purrs. Sounds like the PO at least did some maintenance which is much better than where I usually start from.

FCP = Warranty = Don't worry about it.

Delphi is a reputable brand and I wouldn't hesitate using them in my vehicle.

"Black Bastard" was doing the temp spiking to hot and then coming back down and it wasn't overheating so I ignored it and it hasn't happened in a while. Mind you there was no error code regarding coolant temp (That I remember anyway)

The temp sensor in the lower hose is something that goes out regularly so I would start off there. I bought an Amazon cheapy for one of my vehicles and it worked just fine.

Personally I don't get too caught up with the whole OE/OEM thing. Many of the "premium german" parts that I've bought have MADE IN CHINA stamped right on them so paying top dollar doesn't necessarily guarantee you are getting good quality either.
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Old 05-06-2021, 02:19 PM
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Quote:
Originally Posted by c-bass View Post
Welcome to the world of E53s

I "like" to rescue beat down BMWs myself and my soon to be parted out E83 has 375k on it and purrs. Sounds like the PO at least did some maintenance which is much better than where I usually start from.

FCP = Warranty = Don't worry about it.

Delphi is a reputable brand and I wouldn't hesitate using them in my vehicle.

"Black Bastard" was doing the temp spiking to hot and then coming back down and it wasn't overheating so I ignored it and it hasn't happened in a while. Mind you there was no error code regarding coolant temp (That I remember anyway)

The temp sensor in the lower hose is something that goes out regularly so I would start off there. I bought an Amazon cheapy for one of my vehicles and it worked just fine.

Personally I don't get too caught up with the whole OE/OEM thing. Many of the "premium german" parts that I've bought have MADE IN CHINA stamped right on them so paying top dollar doesn't necessarily guarantee you are getting good quality either.

Thank you! Very happy with the e53 thus far, lots of odds and ends that need fixing. (The wife loves it even more!!)

I also love rescuing badly maintained cars, itís a great pay off.

Okay, before I order I will let others weigh in regarding the temp sensors, Iím sold on the fuel pump! Thanks!!

As mentioned the temp sensors are relatively new (~ 300 miles on them according to the P/O)

All the work on the car has been relatively good, done by an indie shop and the P/O. Some clips and things are missing which drives me nuts!!!! Ordered a bunch of clips and brackets already.


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Old 05-06-2021, 02:57 PM
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The fuel pump is easy to replace so a reputable third party is not high risk. Consider this: if you buy from a national store you might be able to do a warranty exchange even on a road trip it takes very few tools to change the pump.

I bought a premium OEM brand and when I went to install it was doa so there is no guarantee. I have been using an Amazon fuel pump for a few years. The first one lasted 10 months, the warranty replacement has been going 2-1/2 years now.

OEM parts are a must for mission critical places: O2 sensors, MAF, cam sensors, plugs. I would also prob only use oem coils and injectors.

They are cheap enough I also only use oem for Thermostat.

I need to replace my aux fan and I'm definitely going third party on that one!

Do a little math on the fuel pump; 5000-6000 hours is their life expectancy. Multiply by the average speed reported on the dash you should get a fair estimate of how long it should last.
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Old 05-06-2021, 03:03 PM
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Okay, thank you Andrew! Going to get the FCP Delphi pump, cause lifetime warranty :P

I will also get the temp sensors because they are not expensive and I donít trust these at the moment. Wife was driving me around right now, the temp was pegged to got, OBDFusion was reporting 68įC... so that tells me the sensors are kaput and so is the t-stat.

Iíll be ordering the parts when I get back home.

And update the thread with what fixed what. Cheers!
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Old 05-06-2021, 03:14 PM
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New to X5 world, advice needed please (Cooling and fuel pump)

There is a bug that can cause the temp indicator to peg red when engine is not even warmed up.

It happened to me once. I knew the engine couldn't be hot as it was below freezing out and I only had been driving 5-8 minutes.

I had an IR thermometer with me and I verified the temp was just warm. I turned the engine off and back on and temp went back to normal on the non gauge. (the temp indicator on the dash is a there r position indicator not a dial: 1) warning up 2) warmed up 3) overheated).

The sensor is only loosely connected to the actual engine temp. If you are pulling an engine temp from a sensor you'll note that it's not really coordinated with the "dial" on the dash.
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Old 05-06-2021, 03:16 PM
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Good advice on the fuel pump above. I'll add ...

The original pump was made by Pierburg, since bought by TI Automotive. So if you wanted OE quality without paying for the BMW logo, a Pierburg or TI Automotive one (my replacement said Pierburg on the box, and was stamped TI Automotive on the shell of the pump itself) should get you that.
16-11-6-755-043 fuel pump w/o sender (just the pump = Pierburg 7.22013.57.0)

Given that your current pump has not died yet, you might consider carrying it as a spare just in case you need to use that FCP warranty one day.

Not sure what your 4.4 needs, but on my 2001 3.0i, the OE fuel filter was a Mahle KL96, 13-32-1-709-535. That includes the fuel pressure regulator. I believe some of the filters come with the regulator and some don't.

On the temp sensors, it just sounds like you need to track things down carefully - exactly what sensor is being reported as out of spec - find that and test/replace it will probably be what you need. Sounds tough since you have so many factors in there that are at least a little doubtful.

Good luck.
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Old 05-06-2021, 03:21 PM
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Implausible signal usually means an open or a short but also I think the sensor is two in one and can be either side which can def explain the crazy needle since the needle doesn't really track temp but indicates one of three conditions.
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  #9  
Old 05-06-2021, 03:23 PM
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I have the Delphi pump, replaced the whole assembly. As others have stated it's quite easy to do and very accessible .. I have it in my x5 for 8 months and it's running great so far.

Here is the pic side by side.
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Last edited by Magister88; 05-06-2021 at 03:29 PM.
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Old 05-06-2021, 04:03 PM
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Wow, so much good advice, I was fearful there wouldnít be as much information on the x5 as there is on e46ís, boy was I wrong, thank you all for the valuable info,

OldSkewel; I read about the TI auto pump, but FCP doesnít carry it and I like supporting their cause. I will defiantly keep the old one as a spare, whines like a parrot caught in a blender, but it works.
The filter does have a regulator and I will be getting a Mann filter, itís the only one available. (This is according to realOEM).
RE the sensors, yeah, itís tough, I checked both and both seem to be working or in spec on my multimeter, itís tricky to test because I drive and have my multimeter plugged in.
That being said, OBDFusion is reporting a constant 66c - 68c, which shows the t-stat is stuck open.

Andrew; from what I can see, there are no short, I removed most of the cable shielding and there are no open wires or breaks. So thatís good, (I did have new shielding on hand and have replaced it)
Yeah, I have noticed that the needle jumps as apposed to moving gradually with the engine temps.
I will replace the dual temp sensor and go from there.

Magister; fantastic! Thank you, 8 months is a good trial run haha.

Only reason I was skeptical about the pump is because Iíve had issues with my e46 and aftermarket pumps.
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