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Running Problems: Please Help.

thewelsho

By thewelsho
in Scottish Scoobies

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thewelsho

thewelsho

Posted
Posted (edited)

Hi Folks, please help:

Here's the deal

Replaced turbo with VF34 and sports cat downpipe installed. Car mapped and running tremendously well. Took the car on track 3 days after the map and it was fantastic. Drive home, fantastic. Up the next morning, fuel light on took it to the petrol station and 100 yards from the forecourt, the car gives starts to run lumpy as I appraoch the give way, I think oh no, Im out of gas. I make it to the pump, fill up, drive off, same problem.

Its been running like a bag of spanners ever since, mostly in low revs. Changed the plugs no joy, ran a different MAF was a bit better but still not right. I have spoken to everyone and anyone and can't get a solution. It has been suggested that it might be injectors or coil packs (earlier suggestions were thought to be a damaged ring-land due to the ECU knocking at same low revs, however, it seems that its a misfire that is triggering the KS thus making matters worse).

SO! Can anyone help, even to lend me a coil pack or whatever else it might be? I am going to put the car off the road for a couple of days for extensive checks, but would rather avoid that if possible because: a) I NEED the car ;) I DON'T need the expense!

Other info that might be of help:

  • WRX MY06 2.5
  • Diagnostics checks show no sensor faults
  • Misfire at low revs (mostly)
  • No smoke or vapour from exhaust
  • Water levels fine
  • Put fuel cleaner in, no joy

Thanks

John

Edited by TheWelsho
thewelsho

thewelsho

Posted
  • Author
Posted (edited)
get shot of it and buy a classic!...........................

Yeah, I'd get a whole 50 pence for it... Piloschit that it is. ;)

Edited by TheWelsho
the squiggle

the squiggle

Posted
Posted
Yeah, I'd get a whole 50 pence for it... Piloschit that it is. ;)

Possible you have picked up some sediment at the bottom of the tank which could be fouling the pump, filter, regulator or fuel lines

Stab in the dark really but the fact it happened at a really low fuel level may be significant

Green Hornet

Green Hornet

Posted
Posted
but the fact it happened at a really low fuel level may be significant

John,

Wise words. Worth checking the bag filter in the tank to rule it out if nothing else - not a difficult job to do if you've got a spare hour and easier to get at with the rear seat out. Just something else to look at /rule out.

Cheers,

Stewart.

thewelsho

thewelsho

Posted
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Posted
John,

Wise words. Worth checking the bag filter in the tank to rule it out if nothing else - not a difficult job to do if you've got a spare hour and easier to get at with the rear seat out. Just something else to look at /rule out.

Cheers,

Stewart.

Cool! How do I get IN the tank??? Remember you are talking to a total novice! And what am I looking for reagrding a filter, pump and sediments? ;)
thewelsho

thewelsho

Posted
  • Author
Posted
Possible you have picked up some sediment at the bottom of the tank which could be fouling the pump, filter, regulator or fuel lines

Stab in the dark really but the fact it happened at a really low fuel level may be significant

Thanks Squiggly-One-Cayote!

scoobaroo

scoobaroo

Posted
Posted (edited)
Yur a guy and a half Marty, apart from the guy!

p.s. Its easier to work from inside the car, unless you want a sore back ;)

Disconnect the battery and open the fuel cap before you start :P

Also to get the back seat squab out its easier if you loosen the seatbelt anchor points, if you have a strut brace fitted it makes for easier removal.

Marty.

Edited by Scoobaroo
thewelsho

thewelsho

Posted
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Posted
p.s. Its easier to work from inside the car, unless you want a sore back ;)

Disconnect the battery and open the fuel cap before you start :P

Also to get the back seat squab out its easier if you loosen the seatbelt anchor points, if you have a strut brace fitted it makes for easier removal.

Marty.

Thanks mate! What do I do once I get all that out. I mean, how do I clean the pump and the filter etc. What sort of damage am I looking for etc? I can see this ending it a BIG BANG! LOL

scoobaroo

scoobaroo

Posted
Posted

The pump itself is unserviceable, the only thing you can do is check that the filter bag aint full of crap.

If you had another pump to test on your car, this would eliminate the pump.

Sounds a long shot to me, but its another cause you can score from you list.

Just a stab in the dark from me, does your fuel regulator have a gauge on it ??

Maybe sitting at the wrong pressure, worth a try ;) i`m sure someone round your area can loan you theirs for five minutes.

Marty.

colin_ross

colin_ross

Posted
Posted

It may be the fuel pump/filter as you ran it low but did you really run it That far down i.e. way past the point you normally fill up?

Before I started pulling the pump out I'd do a few more check under the bonnet.

The maf was an excellent place to start, did it make any difference at all. If it did you may have a blown lamda as well. When the maf goes the resultant missfuelling has a habit of doing the lamda in too. They're a few quid though so try and borrow one bore you shell out.

The coil pack suggestion is also an excellent one as the lumpy idle but running smoother higher in the rev range (not on boost though) is an excellent description of the sympton. A very quick ceck is to disconnect your coils one at a time and see if it makes the idle worse or remains the same. If it stays the same you know you've found the problem. Again, get a loan of one for a couple of hours and go round and swap out your old ones one at a time for a more reliable test.

thewelsho

thewelsho

Posted
  • Author
Posted
It may be the fuel pump/filter as you ran it low but did you really run it That far down i.e. way past the point you normally fill up?

Before I started pulling the pump out I'd do a few more check under the bonnet.

The maf was an excellent place to start, did it make any difference at all. If it did you may have a blown lamda as well. When the maf goes the resultant missfuelling has a habit of doing the lamda in too. They're a few quid though so try and borrow one bore you shell out.

The coil pack suggestion is also an excellent one as the lumpy idle but running smoother higher in the rev range (not on boost though) is an excellent description of the sympton. A very quick ceck is to disconnect your coils one at a time and see if it makes the idle worse or remains the same. If it stays the same you know you've found the problem. Again, get a loan of one for a couple of hours and go round and swap out your old ones one at a time for a more reliable test.

Thanks Colin

I ran the car for about 20 miles with the light on, but I have done that before. Is it ok to idle and rev teh car withthe airbox and air intake left off, or do I need to put all that back together again after I take out each coil pack?

I have no idea where I can get the bits. None of the sensors are triggering the CEL, is that normal?

Cheers!

colzo

colzo

Posted
Posted

Been following your tales of woe John, sorry I can`t help in any way but hope you find the problem fast so you can begin to enjoy the car again.

thewelsho

thewelsho

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Been following your tales of woe John, sorry I can`t help in any way but hope you find the problem fast so you can begin to enjoy the car again.
Cheers ma man! Me tae!
colin_ross

colin_ross

Posted
Posted

I'm afraid I'm not too familar with those newfangled newages but on a classic if you tried to run it with out the filter box you'd be opk, as long as you've not gone past the point the maf senses the airflow. You only need to turn it over for a min or two so there's not much risk of any debris getting sucked in. Worse case you just do a dry fit without doing up all the clamps etc.

Again, with a classic (mine), I did a maf and lamda and didn't throw a cel. Until I reset the ecu that is. I did n't bother buying one though I just got Andu to turn the lamda funtion off. My current down pipe doesn't even have a boss to fit one.

There's loads of guys on here that I'm sure would help you out with parts to figure it out, just ask. If any of my stuff firt you'd be welcome.

BTW, might have cut it a bit close to you the other morning whist queing on the clydeside expressway passing you in my gsrx. Didn't mean to wake you up.

thewelsho

thewelsho

Posted
  • Author
Posted
I'm afraid I'm not too familar with those newfangled newages but on a classic if you tried to run it with out the filter box you'd be opk, as long as you've not gone past the point the maf senses the airflow. You only need to turn it over for a min or two so there's not much risk of any debris getting sucked in. Worse case you just do a dry fit without doing up all the clamps etc.

Again, with a classic (mine), I did a maf and lamda and didn't throw a cel. Until I reset the ecu that is. I did n't bother buying one though I just got Andu to turn the lamda funtion off. My current down pipe doesn't even have a boss to fit one.

There's loads of guys on here that I'm sure would help you out with parts to figure it out, just ask. If any of my stuff firt you'd be welcome.

BTW, might have cut it a bit close to you the other morning whist queing on the clydeside expressway passing you in my gsrx. Didn't mean to wake you up.

Clydside Expressway, in the morning? Me? I don't go that way!

thewelsho

thewelsho

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My mistake, last week about 4 ish? Man these shifts do my head in.

Aye, was on my way to AndyF to get teh car checked over. I ended up going over teh bridge

and head out Rutherglen way, traffic was a nighmare.

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