Fordmods Logo

Fordmods Advertising

Automatic AU xr8 stalling in reverse while cold 

 

Page 1 of 1 [ 5 posts ] 

 
 Post subject: Automatic AU xr8 stalling in reverse while cold
Posted: Tue Aug 30, 2016 3:33 pm 
Oompa Loompa
Offline
User avatar

Age: 26

Posts: 38

Joined: 19th Nov 2014

Ride: Falcon AU I XR8

Location: Wootton
NSW, Australia

This one has me stumped.
Recently my car has bern idling a little rough in the morning while cold - only while cold.
No big deal, its always been a little rough, however when I change into reverse, the car idles really rough, dropping to around 200rpm at which point it either stalls or chokes back to 600 rpm then either repeats the process or stabilises at 900rpm.

I initially thought it was a battery issue as the interior light flickers while it idles.
Checking the battery though, I get 12volts at crankover, which then builds up to 14.8v in about five seconds

So, ruling out the battery, I next thought maybe its the air intake as I only just put a new air filter on two weeks prior.
No luck, everything was clean and clear.

Maybe it was a loose or cracked vacuum hose - again, no dice, lines were all good.

This problem started and gradually got worse when my mechanic - without my requesting it - serviced and tuned my throttle body at 300,000kms, though when it first started, it was the opposite - the car idled too high (1250rpm) while warm

So I checked the throttle body. Cleaned it and put it back together, nothing. Still doing it.

The only thing left I can think of is the automatic choke, but I don't know anything about that.
The car runs perfect when in drive, even if cold, and theres no problems with reverse once the car has warmed up.

Anybody got any tips / ideas?


One other little strange thing is that once every few months, just randomly, while the car is idling, the speedometer will fluctuate between 0 and 20 km/h depending on the exact idle speed - even though I am stationary.
After driving a few kms I guess it fixes it as I don't see it again for a few weeks to months

 

_________________

Owner of a 1992 EB Falcon, 2000 AU series II falcon and now a 1999 AU series I AU XR8

Top
 Profile  
 
 
 Post subject: Re: Automatic AU xr8 stalling in reverse while cold
Posted: Tue Sep 13, 2016 9:49 pm 
Getting Side Ways
Offline
User avatar

Age: 32

Posts: 1097

Joined: 10th Nov 2004

Gallery: 10 images

Ride: GU patrol, XH XR6, Isuzu Mux

Location: Mackay
QLD, Australia

didn't the V8 in the earlier EF/EL have a function that they limit engine torque significantly in reverse to protect the transmission. possible this function still exists in the later models. this may be why it looses power/ torque in reverse. but if it runs rough might have to get that sorted first. maybe try removing the inhibitor switch and trick it into thinking its in drive but really in reverse, see what this does.

 

_________________

' 96 Xh XR6 Ute
'96 DF LTD 6cy
'08 GU Nissan Patrol
'15 Isuzu MUX LST

Top
 Profile  
 
 
 Post subject: Re: Automatic AU xr8 stalling in reverse while cold
Posted: Wed Sep 14, 2016 1:00 pm 
Getting Side Ways
Offline

Posts: 2438

Joined: 5th Nov 2004

Gallery: 7 images

Location: Brisbane
QLD, Australia

Could be the O2 sensors - My AU did this but also in Drive until the ECU failed it every morning.

Once of my sensors was intermittent - heat related.

Nigel
Top
 Profile  
 
 
 Post subject: Re: Automatic AU xr8 stalling in reverse while cold
Posted: Mon Sep 19, 2016 4:27 pm 
Oompa Loompa
Offline
User avatar

Age: 26

Posts: 38

Joined: 19th Nov 2014

Ride: Falcon AU I XR8

Location: Wootton
NSW, Australia

I'm leaning toward O2 sensor as well.
After removing a section of muffler from my exhaust, the car is idling far better, but is still slightly choking this time when I first accellerate in reverse. Far better than it was before though.

Before we go blaming the exhaust, I can say I doubt it was related to that.
The exhaust was only 10 months old or so and was a straight-through sports exhaust. There were no blockages or even carbon deposits.

 

_________________

Owner of a 1992 EB Falcon, 2000 AU series II falcon and now a 1999 AU series I AU XR8

Top
 Profile  
 
 
 Post subject: Re: Automatic AU xr8 stalling in reverse while cold
Posted: Mon Sep 19, 2016 5:42 pm 
Getting Side Ways
Offline

Posts: 2438

Joined: 5th Nov 2004

Gallery: 7 images

Location: Brisbane
QLD, Australia

Try disconnecting the o2 sensors. That at least will give you a consistent result. The Eau should fail them fairly quickly
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 5 posts ] 

Who is online

Users browsing this forum: No registered users and 15 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Thu Dec 08, 2016 11:06 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names