Jump to content
SAU Community

Recommended Posts

Before the keyboard warriors see this and have a fit yes I've searched. Cry somewhere else.

Brief overview of symptoms:

- Fuel pump makes loud noises

- Car suddenly shut down after running smoothly

- Won't start

- Eventually got it started but hard to keep running

- Revs die with throttle

- Car runs rough and has slight back fire

- RAA dude thinks it's AFM problem

Mods:

GTR fuel pump

HKS Pod filter

3.5" exhaust

12 psi

Book:

I drove to my mates house (about a 20min drive) car was being babied as usual and was running smoothly the whole trip, got to my mates place the fuel pump started making some loud weird noises like squealing, gurgling, and just before the car shut off it sounded like it sucked in a heap of air. I tried to start the car again but nothing, no pumping from fuel pump and no attempt to fire up. I first thought the car ran out of fuel but still had just under ¼ tank left. 2nd thought was maybe fuel pump died…

Let the car sit for a about 10 mins, try to start the car again this time I could hear the fuel pump nosily pumping, crank it a few times with/without throttle and doesn't start. I leave it for a few hours thinking maybe an overheated fuel pump.

Put in 11L of PULP.

Crank the car for awhile, eventually get it started keeping it alive with throttle, revs just keep trying to die, it runs rough and has slight back fire.. Eventually the revs just drop even with throttle and then shuts down. Go through the same process a few times, thought when first shut maybe the pump picked up some dregs in the tank or air, but after running for about 10 mins I though it should have cleared by then.

Checked under hood if things are all plugged in/ secured properly, all look fine.

Called the RAA

An hour later,

The dude looks under bonnet and checks if things are all plugged in/ secured properly and intercooler piping, all good. Couldn't get it started.

His conclusion, not coil packs, not fuel pump but most likely AFM.

What do you guys think???

Anyone got a good AFM I could try?

Link to comment
https://www.sau.com.au/forums/topic/337474-r32-gts-t-skyline-shite-itself/
Share on other sites

My guess would be fuel pump/fuel pressure. If the pump itself hasn't died, theres still alot of things that could have gone wrong with it to cause this. I.e. the gauge is faulty, pump runs dry and dies/won't supply fuel (especially with the noise you described), rubber hose that connects the pump to the bracket split/disconnected, fuel sock sucks up muck with the near empty tank and won't let any more fuel through (had a VR Commodore do this just last week actually and did the same thing, and no it's not a fair comparison), reg/injectors blocked etc. But most of this would happen over a period of time, not instantly.

1. Get a gauge and check what fuel pressure/flow you have.

2. If you disconnect the AFM, the computer will go into limp home mode, and it "should" start, or at least change the way it starts/runs and help with diagnosing it.

This is the first time you've had trouble with the car?

+1 for being fuel related. the fuel pump making noises is a good clue to that. the fuel pump won't start making funny noises if it is something to do with the AFM as the pump would just keep on doing it's thing.

so as people have suggested, check fuel pressure, check fuel pump and possibly replace fuel filter.

fuel pressure issue could be caused by either dodgy fuel pump or dodgy fuel pressure reg, or possibly even blocked fuel filter.

  • 1 month later...

Deff not AFM.

Just wondering if the R32 has 1 or two fuel filters? I found one under the bonnet under the plenum area... but looks like there is another fuel line but can't seem to find the filter? Anyone know?

Cheers

  • 1 month later...

Had a bit of time to check a few more things the other day..

Lifted the hood, had a quick look for anything unpluged or any corrosion, didn't find any.

Did an ECU check, all was good.

Unhooked the hose from the fuel rail and heaps of fuel flows out (filled 2 ltr bottle quickly) from just the ignition on, if hold thumb on the end of the hose quite tight, it stops the flow.

I think fuel is getting in, when trying to start I also pumped the accelerator a few times and it blew a very fine puff of black smoke and had a strong smell of fuel.

Took coil packs off and checked spark plugs, there is unburnt fuel on them and black (plugs are fairly new).

Edited by Sports Crazy

sounds like the fuel pump is ok. the turning it over, etc may have fouled your plugs. try a new set of plugs and see what happens. doesn't explain the sudden cutting out, but may explain the running rough.

if it still runs like arse with the new plugs then i would start looking closer at AFM and injectors and possibly coils and ignitor.

Had a bit of time to check a few more things the other day..

Lifted the hood, had a quick look for anything unpluged or any corrosion, didn't find any.

Did an ECU check, all was good.

Unhooked the hose from the fuel rail and heaps of fuel flows out (filled 2 ltr bottle quickly) from just the ignition on, if hold thumb on the end of the hose quite tight, it stops the flow.

I think fuel is getting in, when trying to start I also pumped the accelerator a few times and it blew a very fine puff of black smoke and had a strong smell of fuel.

Took coil packs off and checked spark plugs, there is unburnt fuel on them and black (plugs are fairly new).

You have flow but not pressure, ignition on the pump should supply 70+psi if the hose is completely blocked off. I'd still be looking at a fuel pump issue. Get a gauge, it's an EFI system not a 253 with a carby...

flow and pressure are essentially the same thing. if it was able to fill up a 2L bottle quickly then it obviously has decent flow and pressure, and if you have to hold your finger over the end tightly to stop the flow then it obviously still has decent pumping pressure. enough at least to start.

Deff not AFM.

Just wondering if the R32 has 1 or two fuel filters? I found one under the bonnet under the plenum area... but looks like there is another fuel line but can't seem to find the filter? Anyone know?

Cheers

two if you count the sock on the pump. the other one is on the strut tower drivers side.

when I tore mine down and pulled the pump the sock was FULL of crap and the pump itself was making horrible noises.

look at both.

flow and pressure are essentially the same thing. if it was able to fill up a 2L bottle quickly then it obviously has decent flow and pressure, and if you have to hold your finger over the end tightly to stop the flow then it obviously still has decent pumping pressure. enough at least to start.

not really. it is was running properly then you should not be able to hold your thumb over it. by rights the pressure should push your thumb off the line. opearting pressure should be 35-40PSIG.

not really. it is was running properly then you should not be able to hold your thumb over it. by rights the pressure should push your thumb off the line. opearting pressure should be 35-40PSIG.

+1

Pressure is proportional to flow and restriction, the pump might be able to push the fuel out with no load, but once the car tries to start the pump has to keep pressure up to the injectors to allow them to spray properly. Get, a, gauge.

As I said before, had a VR commodore with the same symptoms, ran like crap hard to start etc. Fuel would come out if you had the line disconnected, but once the gauge was connected in line and the car running, the pressure dropped off till the car stalled after a few seconds. Ended up being the fuel sock on the pump. New pump and all good.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • So, I started this repair and got as far as "fixing" the holes with some fibreglass. God all those years working on boats came back quickly. I decided I'd reach out to some rust guys just to see what they would say about it. I came across a guy about 40 mins away and went to see him. He said the windscreen needs to come out, that there might be some more bits around the windscreen and he'd quote them at the time. But his quote was $300 to remove and replace windscreen and $3k for the damage he can see. He said he could respray the roof for $1200 and the bonnet for another $800 (somebody has previously rattle canned it, its horrendous). This is $5300 + any small additional bits. It's a lot, I get that and the name of one of my fave youtube channels 'Not Economically Viable' comes to mind.  I'm not being financially rational, but I've taken him up on the quote. He's opening a new shop in November with more room, so we're waiting for that. I'll leave the currently missing headliner out until then. I'm looking forward to it being fixed and having the paint looking nice again (lots of clear coat issues on the roof too). / flame suit on.
    • Oh and some up-and-comings; New rear drivers wheel bearing. I'll do that this weekend while the diff is out. The car is already up and the d/c axles and missing exhaust will help with space. This is the last bearing for me to do and I've been dragging my feet on it. I also have some new EBC blue stuff pads for the car and some new brake fluid. I haven't ever flushed the fluid in this car and looking forward to it. I have 600 degree fluid to put in. Not exactly "race fluid" but better than the typical stuff I have been using.
    • A proper clutch/plate type mechanical diff with quite a lot of pre-load and high locking % is better for drifting. Much more consistent in its behaviour. A helical can be annoyingly vague and inconsistent in how it responds under the sorts of abuse found in drifting.
    • Some updates here. I pulled the entire interior out, minus some trim to respray the seats with Colourlock dye. It turned out really nice though I accidentally let the dog in the car after and she scratched up the front seat.  This is what it looked like before, the colour was just washing out everywhere but thankfully the leather was in good nic. Then after the respray   And after the bloody dog jumped in The headliner is out waiting to be retrimmed, but it will stay out now until Nov - see why below. I replaced the stereo/headunit with a period-styled Android headunit. I have no after pics, but I'll get some. This is because of the missing pixels. I tried to fix this twice with replacement ribbon cables but couldn't. Also the bluetooth interface I'd bought for this was crap. Then there's the rusty roof. Pics and info in this other thread. I have decided to get this repaired professionally, but I'll update that thread. This is why the headliner will stay out for now. I'll be getting the roof and bonnet resprayed at the same time the rust is fixed. I also had an interesting issue with my drivers door lock.  For a small period I was having issues getting any 12v power to the car - I mean *any*. It would have no dash lights, nothing. It happened while I was at the shops and I couldn't get in the car. So, we had 2 problems. The most pressing here is that I was locked out. I have only a single physical key hole on the car, the drivers door and no amount of turning would unlock the car. Surely it doesn't need power for this? The second issue is why am I losing all power periodically, The battery isn't dead, its almost like the battery isn't even there. Two issues that were surprisingly easy to fix. You fellow BMW over-engineering lovers will appreciate this. The lock in the door has 5 states; mechanical lock, electric lock, neutral, electric unlock, mechanical unlock achieved at -90 degrees, -45 degrees, 0 degrees, 45 degrees and 90 degrees. Although, the unlock is towards the front of the car, so opposite for LHD countries. Sticking the key in and turning 45 left or right is what is used 99% of the time. It activates the central locking etc. 90 degrees is for dead battery access and, obvs, only un/locks the one door. But because the mechanical lock is never used and is 27 years old, it seizes up. I was totally unable to turn the key far enough to get to the mechanical unlock (At the time of locking myself out, I didn't even know this was a thing). I eventually did it with some vicegrips and teflon spray.  I made a quick vid for other E39 peeps.   The battery issue is totally new to me also - It wasn't making sufficient contact between the post and the terminal. The terminal was bolted on tight, but the car wouldn't have power. After checking the battery with my multimeter I accidentally contacted the terminal and the battery post and the car got power. The battery was only a few years old and in good condition. I cleaned the post and the terminal with a wire brush, bolted it back on tight and never had the issue again. I'm still surprised that despite having solid contact it didn't work. Also, the car was getting Warragamba sized pools of water in the back when it rained. My initial concern was another rust problem. But when I went out on Weds while it was raining and while I had no headliner in I could see a steady stream of water coming through the roof mounted aerial. As this aerial is for the (now removed) car phone I pulled it out and whacked a blanking grommet in the hole. It seems fine now. I'm thinking I might get the hole permanently filled when the rust is fixed. Moving forward and things in progress; The tailgate needs some attention. I have taken all the trim off to clean it all and address some small rust spots. I have partially done all of this but I'll finish it up hopefully this weekend. As all the trim are now entirely devoid of trim clips I have bought a heap of strong velcro and I'm hoping it does a good enough job as any of this trim in good condition is super expensive and usually in Europe as we dont have many of the wagons here. Suspension and brakes!!! This is exciting. In the front; New control arms New sway bar links New lower Eibach springs (the only modification I'm planning on this car) M Sport shocks (these came with the car and will replace the longer shocks in the car) New top mounts Used 540i calipers (stock brakes suck!) New 540i disks and pads (22x296 mm for 528 and 30x334 mm for 540i) New front wheel bearings (thank all that is holy for bolt on bearings!) Annnnd in the back; New control arms New sway bar links Adjustable air suspension arms (fool the car into what the current height is so the self levelling suspension can match the new front ride height) New ball joints I'll also be doing a brake fluid flush while I'm in there. I'm planning on switching the car over to the 16's that came with it so I can clean up and respray the M Sport 17's. They've lost a lot of colour over the years and have some gutter rash. None of this will start until the E90 is back.
    • You mean you will regret it for drifting duties? I don't quite follow.
×
×
  • Create New...