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JEREMYZ
08-18-2006, 03:32 PM
Hi,

I recently diagnosed my car with a short in the Fuel Pressure Regulator Control unit due to a OBD code of: "P1250- PRC Solenoid Circuit Malfunction". This is also causing a cylinder #2 misfire which makes sense if the engine is getting the wrong gas pressure during acceleration. Could someone please help me out with a diagram, picture or description of where this PRC unit is in my car? I have a '99 528i.

All the guy at the dealership could tell me was that it was somewhere between the front bumper and the windsheild which was no help at all. The part is only about $65.

A am not a mechanic, but like to DIY if I can. PLEASE HELP!
:eek:

Emerald City 99
03-06-2007, 11:41 PM
Did you ever get an answer on this. I have a 1999 323i with same code and sounds like identical problem. Rough (weak) acceleration. Anytime I give it a lot of gas it stumbles and the engine light comes on. Definately sounds like a fuel delivery problem.

Is the part really only $65???

Did you find out where to locate it?

Did it resolve the problem?

keano16
04-11-2007, 11:38 AM
I am having the same problem. Can anybody shed light on this problem. Have you guys fixed this issue?

cn90
04-11-2007, 02:23 PM
1. Get a BMW TIS CD from ebay for $9.95 or so. Lots of repair info for differenet models: E39 E46 etc.

2. Fuel system work is dangerous.
Study the steps before doing it.
The fuel regulator for E39 can be mounted on the fuel rail or under the car (per TIS)
For E46:
http://www.pelicanparts.com/bmw/catalog/shopcart/BE46/POR_BE46_FULful_pg2.htm#item6

But check your vacuum hose first.

speedinnovation
04-19-2007, 03:32 PM
Im having the same problem my self with a 1999 528i with codes P0305-cylinder 5 missfire, P0306-cylinder 6 missfire, P0441-evaporative emissions control system incorrect purge flow, P1250, and P1580-throttle valve mechanically stuck. Has anyone had any sucess getting rid off this code. My car is idling and runing rough and the EML light comes back on after being cleared once i step on the gas pedal. Im really handy with cars but this one has me baffled :dunno:

jda2000
04-19-2007, 06:33 PM
in the '02 530i, the fuel pressure regulator comes included with the fuel filter as one component. don't know about the '99.

skydryice
04-19-2007, 09:30 PM
This should help some... let me know if have any other questions...

s7000
08-24-2007, 06:55 AM
"OBD code of: "P1250- PRC Solenoid Circuit Malfunction". This is also causing a cylinder #2 misfire "

I'm getting this exact code and cylinder #2 is missfiring!

Let me tell you, however, I've diagnosed my problem to a faulty coil pack on Cylinder #2. I'm hoping/betting the missfire would cause a fuel pressure problem and would be prone to generate the P1250 code.

What was the final resolve/ fix for your issue?

MAaamcbray
08-26-2007, 07:18 PM
I have a similar problem - 1997 528. Cylinder #2 misfire with code P1250. I have swapped coil packs and changed spark plugs with no luck. Did you solve your problem?

mrthomas
05-21-2010, 02:49 PM
I have a similar problem - 1997 528. Cylinder #2 misfire with code P1250. I have swapped coil packs and changed spark plugs with no luck. Did you solve your problem?



Me too....I have a 1999 323i I got a p1250 with the random misfire of p0300 and a list of cylinders. I have changed evr and cleaned the intake manifold adjuster unit as well as changing fuel filter,spark plugs and coil packs. still no luck in clearing this code. I know one of the causes of a random misfire can be a lack of fuel pressure so I am at this point now after checking the other possible causes. Anybody correct the fuel pressure problem and cleared the rough idle and check engine light?

mrthomas

Jase007
05-22-2010, 07:13 AM
If you suspect fuel pressure issues .... you need to hook up a fuel pressure gauge to the schrader valve on the fuel rail. IIRC, all E39s are supposed to have 50 +/-2 psi of operating pressure. Mine was in spec when I had a no-run fuel related condition (no codes) and I ended up tracing my no fuel delivery problem to a broken + wire under the fuel level sensor on the passenger (right) side of the car... the side (in tank) above the in-tank fuel pump.

I'm not suggesting that is the source of the problems discussed here.

On my touring (2000, B28M52TU, Siemens MS42) the fuel pressure regulator was integral to the 3/2 running loss valve underneath the car on the driver's side (left). I replaced the 3/2 running loss valve and integral (can be removed and singularly replaced) FPR as part of a coomplete fuel system overhaul (two level senders, fuel pump, FPR, 3/2 valve, sucking jet, etc...).

I bought my fuel pressure gauge from MAC Tools for about $100 and it has schrader valve adapters for newer model BMW/Porche/Audi/VW, etc...

cmica55
08-19-2010, 07:07 PM
these 2 codes came up ,the car is not running bad but the light comes on 99 m3

hottnucks
10-04-2013, 09:55 PM
Hi,

I recently diagnosed my car with a short in the Fuel Pressure Regulator Control unit due to a OBD code of: "P1250- PRC Solenoid Circuit Malfunction". This is also causing a cylinder #2 misfire which makes sense if the engine is getting the wrong gas pressure during acceleration. Could someone please help me out with a diagram, picture or description of where this PRC unit is in my car? I have a '99 528i.

All the guy at the dealership could tell me was that it was somewhere between the front bumper and the windsheild which was no help at all. The part is only about $65.

A am not a mechanic, but like to DIY if I can. PLEASE HELP!
:eek:

10000% your fuel pump and change ur fuel pressure regulator when you do your fuel pump also cause i made that mistake also.. And one more thing DONT CHEAP OUT!! AND DONT BUY STUFF FROM HONG KONG

Mannyf540
10-05-2013, 12:14 AM
Go here and enter the last seven of your vin and follow the web prompts :

http://www.realoem.com/bmw/select.do


Sent from BimmerApp mobile app

ahull
10-14-2013, 06:56 AM
10000% your fuel pump and change ur fuel pressure regulator when you do your fuel pump also cause i made that mistake also.. And one more thing DONT CHEAP OUT!! AND DONT BUY STUFF FROM HONG KONG

Hey - you replied to a post from 7 years ago btw.

Mannyf540
10-15-2013, 02:31 AM
Hey - you replied to a post from 7 years ago btw.

Lmfao.... that so fuking funny !!!

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Burning2nd
10-15-2013, 03:37 AM
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