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DaviiD · Alfa Arna Joined: 25 Jul 2007 Posts: 9

Hi.

I've just bought a 1.7 16V Permanent 4 and have some problems/questions:

Question 1:
ECU in this car was was originally fitted in car with lambda sensor. Then wiring was removed and changed with non lambda wiring, but ECU remained the same. Now, how do i convince ECU to always run in open loop mode ? Is this only done by FQS (which i wired correctly) or something else needs changing too ?

Question 2:
When driving with 4WD on and going into a slow hard turn with low speed (or starting) i feel juddering from rear wheels. It feels like i have no viscous coupling or 100 % rear diff lock. Rear diff is open diff, right ? Is this normal behavior or not ?

Question 3:
When i turn key to ON position i hear click when electric coupling engages. But sometimes it does not engage but it keeps clicking. If i leave car clicking it will, after numerous clicks, disengage 4WD and illuminate 4x4 warning light. But if i start the car and rev it a little, it will engage 4WD normally when alternator comes on. Is this normal ?

Will post pictures soon.

Thanks.

Admin · Posted: Thu Jun 12, 2008 11:51 am Post subject:

Hi

Not sure about the ECU.

The judder is normal. The viscous coupling is trying to get the front wheels combined speed to match the rear wheels combined speed, which is not possible on full lock so it lands up locking the viscous coupling up.

My P4 occasionally does the same, but I blip the throttle to get the alternator going quickly and generally never have an issue.

All the best

Keith
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ZeNiTh-PbArM · Posted: Thu Jun 12, 2008 6:15 pm Post subject:

Hi,
i'm sure about the ECU.
the judder is quite normal, but can be felt most of the time when the viscous coupling rubber mounts are worn.
the electromagnetic coupling oscillating is really an electrical problem due to voltage drop in the wiring harness. As said, start the engine quickly and/or clean and tighten terminals, ground connexions, battery connexions, ...

regards,
zp

ceci · Alfa Arna Joined: 17 Apr 2008 Posts: 15

my p4 made a clicking sound when i turned on the ignition and after driving for a while it would disengage and the 4x4 light would come on.................i got the car checked and it was a faulty disengaging sensor so i bought and fitted a new one.
now when i turn on the ignition there is no clicking sound and the 4x4 light stays off .
the car now runs as it should. 4 wheel drive.

i suspect if you can hear a click when the ignition is turned on it means the sensor is starting to fail.

i was told the sensors are sensitive to heat and over time they fail.

hope this helps

paulhide · Posted: Mon Jun 16, 2008 10:45 pm Post subject:

Totally agree with the tooth mesh sensor diagnosis.
Isn't there a relay in the loom for telling ECU which fuel-type/whether to use lambda probe? There's an article somwhere on here isn't there?
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DaviiD · Alfa Arna Joined: 25 Jul 2007 Posts: 9

Thank you all for answers.

It is relay like connector, but it's not a relay.

paulhide · Posted: Tue Jun 17, 2008 8:38 am Post subject:

Yes and somewhere on this site there is an article or a link showing which parts of the connector to link for different variations of fuel running. Anyone know where it was?
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bobbber · Posted: Tue Jun 17, 2008 9:16 am Post subject:

www.sanderfamily.com ?
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DaviiD · Alfa Arna Joined: 25 Jul 2007 Posts: 9

2 ZeNiTh-PbArM: You can also use brake while starting the car. Brake disengages magnetic clutch so there will be no clicks. Once the car starts you just let the brake off and clutch engages with no problems.

The car now goes as it should, but there are still some questions that i'd like to be helped with:

- How much free play is allowed in rear diff? Lets say you have 4WD disabled and you try to turn prop shaft while rear wheels are on the ground. Is it normal that it has approx. 1/8 - 1/10 turn of free play ?

- Viscous coupling can not be turned by hand. What torque is required to turn it ? If you grab input and output shaft, can you turn them by hand ?

- Is viscous coupling serviceable ? Grease in it needs changing ?

Thanks for answers.

Admin · Posted: Sun Jul 13, 2008 9:20 pm Post subject:

Hi

Not sure how much play is OK in the rear diff, but that does sound too much.

I have a spare viscous coupling and cannot turn it by hand.

Don't believe the viscous coupling is user serviceable.

All the best

Keith
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paulhide · Posted: Sun Jul 13, 2008 11:46 pm Post subject:

Yes you can turn propshaft (ie viscous coupling) slowly by hand, but takes some doing.
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