Stalling issue at when at idle in gear

[davev8i]

Hey,

i have had a stalling issue in the past when stopped at traffic lights ect the throttle seems to go up and down until it eventually stalls. Went to a landrover specialist with with the issue said to have been fixed. Wasnt long before it started happening again.
Several visits with each time something new being replaced, a new Air flow meter, New landrover air intake, and new potentiometer.
And now it happened again a couple of weeks ago, i fiddled with the airflow meter connection and has been fine since

Has anyone had this issue? i feel it could a electrical wire perhaps that isnt working properly. I know that the Air flow meters are a bit finicky, it was replaced about a year ago.

Any ideas would be much appreciated

Cheers
Dave

[Tank]

Would help to know what year and model Land Rover you are talking about, Regards Frank.

[davev8i]

Yeah slipped my mind, i have a 97 V8i Auto

[PhilipA]

14CUX has a pretty crude IAC system which depends on the Kerb/base idle to work properly.
If the base idle is set too low then you will get this surging as the IAC plays catch up.
The fix is usuallyto set the base idle at about 600RPM in neutral.

To do this you block off the IAC inlet and the tube that attaches to the inlet and turn the allen key on top of the throttle body anticlockwise to increase idle speed.
Also ensure that the throttle blade and general area is clean with some carby cleaner on a rag.
Regards Philip A

[98discovery]

Hi
Seems as though there is an endless list of possible causes for this problem.....
I have found that the biggest issue for my V8 was ignition timing.Even though the following was worked through
*The MAF was adjusted correctly .
*Ignition system A1
*Injectors removed and cleaned,fuel pressure checked and o.k no air leaks around intake system.
*IAC cleaned and working fine
Eventually the issue was not really eliminated until I set the timing to 12deg BTDC (previously set to 6 deg BTDC).
This made a world of difference to the idle and performance/economy of my vehicle. I have since had a bit of trouble but tracked that down to the plug on he MAF. By cleaning these pins and putting a very slight twist in them as described in other posts the problem was resolved.
In short you need to eliminate each possibility systematically and as I found you will probably gain small improvements until eventually the root cause of the problem is found.
Still not sure why the ignition needs to be set so far advanced but whilst it runs perfectly and doesn't drive me insane with the surging idle and stalling I am happy.:):):)

[bee utey]

Hi
Seems as though there is an endless list of possible causes for this problem.....
I have found that the biggest issue for my V8 was ignition timing.Even though the following was worked through
*The MAF was adjusted correctly .
*Ignition system A1
*Injectors removed and cleaned,fuel pressure checked and o.k no air leaks around intake system.
*IAC cleaned and working fine
Eventually the issue was not really eliminated until I set the timing to 12deg BTDC (previously set to 6 deg BTDC).
This made a world of difference to the idle and performance/economy of my vehicle. I have since had a bit of trouble but tracked that down to the plug on he MAF. By cleaning these pins and putting a very slight twist in them as described in other posts the problem was resolved.
In short you need to eliminate each possibility systematically and as I found you will probably gain small improvements until eventually the root cause of the problem is found.
Still not sure why the ignition needs to be set so far advanced but whilst it runs perfectly and doesn't drive me insane with the surging idle and stalling I am happy.:):):)

Ignition advance raises the base idle speed. Another way is to adjust the bypass idle screw more open. It is in the top of the manifold adjacent to the air inlet, needs a 3/16" allen key. It's one of the first things to check.:)

[Old Farang]

Still not sure why the ignition needs to be set so far advanced but whilst it runs perfectly and doesn't drive me insane with the surging idle and stalling I am happy

It is not unkown for the timing marks to be slightly out on these engines. What you are seeing as 12 degrees may not actualy be that.

[98discovery]

Bee Utey
Your correct the base idle did increase after advancing the timing and as a result I had to make an adjustment to the base idle screw to return it to the correct idle rpm's.(I forgot to mention this in the original hit list of things done!)
It would appear in my case that the engine was running way too retarded as I not only cured the annoying idle issue but gained improvements in the performance and fuel economy.

[It'sNotWorthComplaining!]

A dirty stepper motor (IAC) causes this also. Base idle should not really need adjusting unless some one has played with it. A spray of a good carby cleaner into the hole the IAC screws into should remove carbon that builds up there and soaking the end of the IAC nozzle can stop the fluctuating idle .
we have tried this on a few V8 and it fixed the problem.