Falcon AU Stalling when in Reverse

Morgz88 · 07-05-2007, 07:51 PM

Hey Guys, great forum, am loving it.

I have a Falcon AU Forte 2000 auto.

Just recently, it has started stalling when put into reverse gear.

Only happens first thing in the morning, once normal temp is achieved it doesn't stall but is still a bit humpy when put into reverse. Drive is also a bit humpy at idle but is not stalling.

Seems like it has a little more pull when in drive and reverse too, as in it rolls a bit faster on a flat when no brake is applied.

Everything else about the car seems fine as far as power and performace is concerned (maybe getting 20-30kms less milage per tank).

Anyone experienced anything similar or might know what the cause of this may be?

Thanks in advance.

Morgz.

Morgz88 · 09-05-2007, 07:02 PM

Are there any forum rules regarding first posts that I may be unaware of?

Can't help noticing this is the only post that hasn't had a reply.

Sorry.

JC · 09-05-2007, 08:41 PM

Quote:

Originally Posted by Morgz88

Are there any forum rules regarding first posts that I may be unaware of?

Can't help noticing this is the only post that hasn't had a reply.

Sorry.

Welcome. Despite no replies to your question, you will find plenty of useful info on this site, and no, there are no rules regarding first posts. Actually, in terms of first posts, it's unusually good, in that it's seeking advice, not abusing someone! :-)

As for your problem, the Idle Speed Control (ISC) Valve controls engine speed at idle, so it could be that. Do a search and you should find a way to clean up the ISC (pretty sure this is another of GK's How-Tos).

bodes-sh · 09-05-2007, 09:24 PM

how long has it been since the trans was serviced? if it has been serviced that is, try getting a flush done, while they are at it let them know what is happening and see what they reckon...some solenoids or other parts in the box may need replacing

Fairlane · 09-05-2007, 09:46 PM

Yeah sounds like the idle speed is off to me, best to check the Idle Speed Controller.

Does have the aircon off or on make any difference

Quote:

Seems like it has a little more pull when in drive and reverse too, as in it rolls a bit faster on a flat when no brake is applied.

Thats nothing special, the reverse gear is shorter than first, so thats standard AU fare.

Morgz88 · 10-05-2007, 01:42 PM

Thanks very much for the suggestions guys, much appreciated.

@Fairlane, cant say whether there is a difference with aircon on, as I dont use aircon first thing in the morning and it wont stall once the car is warm. Also regarding the extra pull I mentioned, it seems to only pull more since the stalling started and rolls faster on a flat when not braking.

@bodes-sh, not sure when trans was last serviced, only had the car for a year.

@JC, does the temperature of the car have any effect on the ISC, the stalling in reverse only happens when started first thing in the morning? Once the car is warm the stalling stops but is still a little humpy when put into reverse.

Thanks again for the advice guys.

Robe · 10-05-2007, 01:53 PM

Are you backing out to begin the journey and so this is when the car first has to deal with waking up cold? Reverse might not be the issue in this case

If do you drive forward for some distance and then the poor old thing starts to stagger when asked to go backwards then there is the relationship with being in R.

The only other thing I can think of is the ignition lock-out that protects us from starting in gear playing up some how.

bodes-sh · 10-05-2007, 09:07 PM

i guess a way to determine whether it is reverse or not that is playing up would be to reverse the car in the night before? that way see if it does it driving forwards in the morning...lately mine has been stalling when first started in the morning, i think the fuel pump is on the way out causing this

Morgz88 · 11-05-2007, 11:21 AM

Thanks for all replys again.

Yes its when backing out first thing in the morning that it stalls, and its only when I hit the break to put it into drive that it stalls, but its only just started doing this.

Now it seems to be trying to stall when put into drive, but ONLY when the car is cold.

2 weeks ago it had no problem like this, would simply back out nicely then go into drive with no problem and was running smooth.

Fuel pump hmmm....... now you mention it, it seems to be making a much louder buzzing sound than it used to, maybe i'll pop it out and give it a clean and see how it goes.

Thanks again all.

JC · 11-05-2007, 12:09 PM

Quote:

Originally Posted by Morgz88

@JC, does the temperature of the car have any effect on the ISC, the stalling in reverse only happens when started first thing in the morning? Once the car is warm the stalling stops but is still a little humpy when put into reverse.

Thanks again for the advice guys.

Yes, when the car is cold, more fuel is dumped in so that it will run OK. That means it needs more air too, I guess, so if the ISC is a little dicky, or stuck anywhere, it may not open up enough to allow more air to travel through, which is causing your stalling issues. As the car heats up, the mixtures lean off a bit, requiring less air so the problem wouldn't be as bad once hot/warm.

It's quick and easy to clean the ISC so I would be checking that first.

Morgz88 · 11-05-2007, 10:12 PM

Hey JC, you say it's quick and easy to clean the ISC, any chance you could tell me exactly where it is located?

Have done a search but unable to find the location of the ISC.

I am sure as soon a I see it I will be able to work out how to inspect and clean it, just not sure where to look.

Thanks.

bodes-sh · 11-05-2007, 10:25 PM

right on top of the throttle body, it's a silver can looking thing with a wire coming out the back of it

JC · 11-05-2007, 11:10 PM

Quote:

Originally Posted by Morgz88

Hey JC, you say it's quick and easy to clean the ISC, any chance you could tell me exactly where it is located?

Have done a search but unable to find the location of the ISC.

I am sure as soon a I see it I will be able to work out how to inspect and clean it, just not sure where to look.

Thanks.

Here you go - follow the directions in this link:
http://www.fordforums.com.au/showpos...9&postcount=43

Morgz88 · 14-05-2007, 10:17 AM

Just wanted to say thanks to all who offered advice.

Cleaned the ISC as JC mentioned and it has helped somewhat, car isnt stalling anymore but still humpy in reverse and drive, I can live with that for now.

Have also noticed that pumping the brake or turning the wheel slightly seems to make the idle speed drop for a second or two then return to normal. Seems like it affects the vacuum in the manifold. Is this normal?

Thanks again

Morgs.

JC · 14-05-2007, 02:06 PM

Quote:

Originally Posted by Morgz88

Just wanted to say thanks to all who offered advice.

Cleaned the ISC as JC mentioned and it has helped somewhat, car isnt stalling anymore but still humpy in reverse and drive, I can live with that for now.

Have also noticed that pumping the brake or turning the wheel slightly seems to make the idle speed drop for a second or two then return to normal. Seems like it affects the vacuum in the manifold. Is this normal?

Thanks again

Morgs.

No, that's not normal. Check the inlet manifold bolts - they tend to work loose and create an air leak. The ISC would try to compensate for it, but can only do so much. Also check PCV hoses and MAP hose to ensure these have not come loose creating a vacuum problem - though I would expect your symptoms to be worse if it was one of these loose. I reckon the inlet bolts are the go.