Jamieee

On idle my car sounds like it's missing alittle, under hard acceleration it pulls ok altho sometimes if feels like its holding back.

Driving at a constant speed it really judders! Iv had people say MAF or coil pack?

Is it true if you start the engine and pull the MAF sensor off and it stalls then its not that?

Its a99 UK Turbo with a decat exhaust and panel filter thats it.

Thanks in advance.

joz8968

iTrader: (13)

That's right. So if it idles the same, then it could be knackered... BUT... it's not a failsafe test. Just gives you an indication of whether it could be it or not. So not nuch use really!

99greenwagon

iTrader: (39)

spark plugs?

joz8968

iTrader: (13)

I'm not rising to it 99gw - the mods will soon be having words about our silliness.

Jamieee

??

99greenwagon

iTrader: (39)

i agree mate,genuinly could be plugs tho! im trying to help here!

99greenwagon

iTrader: (39)

private joke between me and joz.....

joz8968

iTrader: (13)

LOL. Don't worry Jamieee.

99gw and I have a long-standing in joke - we're pathetic.

joz8968

iTrader: (13)

Seriously:-

Plugs
Coilpacks
MAF

These are the likely culprits.

172sport

iTrader: (6)

MAF, I had similar, never gave itself up fully, just times of juddering stuttering etc.

I changed cam and phase sensor first to no avail.

99greenwagon

iTrader: (39)

i agree on all of them!

Jamieee

thanks guys, just wanna try the cheapest option first!!

172sport

iTrader: (6)

i got maf, cam and phase for 40 quid

s70rjw

iTrader: (2)

What fuel are you using?

Jamieee

Shell optimax

joz8968

iTrader: (13)

Jamieee

Right after a Diagnostic Test we think its the MAF, so I go to take the old one out, wtf are them screws? You would need like a phillips style screw driver but instead of a point on the end it would need an indent.

Halfords and parkers dont sell the tool, and subaru want £49 to fit the MAF!

Where can I get the tool to do it?

99greenwagon

iTrader: (39)

i used a pair of plier/grips to get them out and then replaced them with normal set screw bolts,8mm spanner size,jobs a gooden,subaru asking £49 is a joke as it is a 2 min job!

joz8968

iTrader: (13)

Are they like the below star shaped indent?:-



If so, these are called Torx (favoured by French car makers, normally).


Or are they like this?:-



Pozidrive.

99greenwagon

iTrader: (39)

they are not pozidrive,they are the same as top pic and in the middle there is a small bit that sticks out a little......if that makes any sense?:

Jamieee

Mr greenwagon is right thats what they are..... i cant get them to budge!

99greenwagon

iTrader: (39)

it takes a bit of doing but if u use adjustable grips or normal biggish pair of pliers as long as you have a good hold on the screw heads they will turn out,squeeze harder and turn!

al_P

maplins sll the screwdriver you are after mate also anyone who can get hold of draper tools

al_P

33 PC SECURITY BIT SET TORX HEX STAR SCREWDRIVER HEAD on eBay, also, Screwdrivers, Hand Tools, Business, Office Industrial (end time 13-Apr-09 14:52:08 BST)

the piece is in that all you need is the screwdriver for it

Jamieee

More confused now than ever.......

1: Car running like a bag when driven normally, would not accelrate, revs all over the place on idle etc (no backfiring)

Iv just changed the MAF as advised after a diagnostic test.

2: Now it drives fine at normal speeds, but once I accelrate its sputters, coughs and backfires..... Its as if the roles have reversed. mad2.gif mad2.gif

Any ideas anyone..... losing the will to live.

Jamie

P.S Iv also now go the check engine light on, is this cus Iv changed the MAF????

joz8968

iTrader: (13)

Possibly - as if the MAF is now good, it's (correct) voltages prob now confuse the ECU (as it may have adapted to the old knackered MAF's voltages).

Do an ECU reset, then go from there:-


Classic (JECS) ECU Reset

1. Ensure engine is at normal operating temperature, turn engine off
2. Locate the two ECU connectors, located under the steering column and consist of a black plastic male and female connector, and a green male female connector
3. With the ignition OFF connect black to black and green to green.
4. Turn on ignition, do not start the engine, depress the accelerator pedal to full throttle, then return it to the half-throttle position and hold for a few seconds, and then release
5. Engine Check lamp turns on
6. Start engine and then drive for at least one minute, keeping road speed above 11 Km/h.
7. ECU is now re-set.
8. At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs.
9. Stop the car and turn off the engine.
10. Disconnect the black and green connectors.
11. Job complete

Black and Green Connectors on Classic

gav2777

ive got a simler problem on my 99 uk turbo drive steady 1500rpm to 3000rpm and it feels like its overfueling when u floor it it clears know its not airflow,plugs,leads changed them couple of months ago, the only other thing it lambda that alters the fuel pluged it in on my m8 diagnostic and lambda sat at a flat 0.9 unpluged the sensor it went to 0.3 gonna get 1 tomorrow hope it fixes it

joz8968

iTrader: (13)

Yeah gav, the Lambda sensor's voltage should continually cycle up and down between 0V and 0.9V, when working correctly.

Jamieee

I did the ecu reset and the light flashed as if all is ok.... soon as I switched off and disconnected the black/green connectors started up and the check engine light was on and the symptoms are the same......

The other wierd thiong is with the old MAF sensor in the check engime light never came on.......

joz8968

iTrader: (13)

Looks like, ironically, that your replacement MAF is knack'd... and the old one is fine!

You only replaced it because you thought it was the problem, yes? Did you voltage test either MAF to see if they're any good?

Prob coilpack/s that giving you the trouble.