Problems with idling

[4x4er]

Hi all,

First post, and I'm glad I found this site, a glodmine of Feroza info!

I bought a nice Feroza a few years back. It has been a nice rig but for a while every now and then the car would stall at the lights or in similar situations, it would then start soon after. I was a little tolerant with it for awhile but now it's getting worse.
What happens, I can start it first time in the morning to drive to work, I will get to work or 5 minutes down the road and if I let the rev's go under 1000 RPM it can stall and won't start for awhile. The problem is it doesn't do it all the time. As I said I can drive it around all day IF I don't let the Rev's go under 1000 RPM's.
The other day I parked on a hill and it wouldn't start again so I run started it but again until the rev's got over 1000 RPM it would kick in.
Anyway I took it to a mechanic and it has him a little baffled. He checked the spark and it was fine. I had the Check valve replaced under the recall about a year ago, but it actually started before that.
We thought maybe a faulty fuel pump so I had it replaced and it didn't stop it. I also replace a relay and the fuel filter, still no joy.
After reading some of the posts here I think maybe it could be the C02 sensor?
The model is a 1992 EFI model widetrack. 300HD I think it called.
It has been a ripper of a car up until now.
Does anyone have a clue as to what it might be?

Thanks,
Rob

[MightyMouse]

O2 sensor is not operative at idle... there's a contact in the throttle position switch (TPS) mechanism on the side of the throttle body that specifically disables it.

If the switch wasn't working ( which is pretty normal ) the most common symptom is the vehicle hunting by a few hundred RPM at idle - following the sensor output

If th sensors really "dead" it "might" be the cause - but that's a guess. Check that the TPS is doing what it should first ... if it is - it isn't the O2 sensor although they do have a finite life of approx 120,000KM

[4x4er]

Thanks MM,

I spoke to the mechanic today, he said he took it to the auto electrician. It never faulted once!!! However when he went to return it to the mechanic he stalled it and it wouldn't start. They now think that it is the crank position sensor that in going out.
Do you know if that is expensive to fix, eg do you have to replace the whole distributer or can you just put a new sensor in it? That's if it at the distributer.

Thanks

[wags]

Mine was doing the same sort of thing it turned out to be the igniter in the dissy, i ended up getting a whole second hand dissy it was cheeper.

[MightyMouse]

There is no crank position sensor on a Feroza... so you can eliminate that.

The module in the dissy is an option - all those small jap dissys are pretty marginal on the ignition front. Another thing to check is the clearance between the reluctor and pickup in the dissy , i've seen cars that wouldn't start because at low speed the module wasn't triggering due to excessive gap. it must not actualy touch, but small is good.

If it is the module just get a replacement from any Applause ( same basic engine ) from a wrecker ( do it youself ones are dirt cheap ) - just get the whole dissy and swap the Feroza cap.

[4x4er]

Thanks guys,

Sounds like the go, it's at the auto shop still, They stil couldn't nut it out. The latest thing they are looking at is he thinks it's actually pumping too much petrol into the chamber and flooding it. He said there is a strong fuel smell whne it won't start. He said it's strange.
The other thing is he recons that you can't get the diagonsitcs from the car like you can on the new ones as it doesn't tell you wahts wrong with it.
I will hunt around for a 2nd hand dizzy or is it pretty cheap to get a new one? If I do the wreckers, how much would I expect to pay?

Thanks

[tehekho]

Thanks guys,

Sounds like the go, it's at the auto shop still, They stil couldn't nut it out. The latest thing they are looking at is he thinks it's actually pumping too much petrol into the chamber and flooding it. He said there is a strong fuel smell whne it won't start. He said it's strange.
The other thing is he recons that you can't get the diagonsitcs from the car like you can on the new ones as it doesn't tell you wahts wrong with it.
I will hunt around for a 2nd hand dizzy or is it pretty cheap to get a new one? If I do the wreckers, how much would I expect to pay?

Thanks

$20

[4x4er]

Good news!

It has been fixed, It turned out to be the coolant temp Sensor.

Symptoms = after running car to get warmed up, try to stall car or let idle too get it to stall. Then try to start it.
Spark and fuel pressure checked and is OK.

Remove spark plug, notice that it is "wet" and very black.

Diagnose: What this ment was that the Temp sensor was sending too much fuel into the chambers and cause it to flood.

Remedy : replace Coolant temp Sensor = $50.00 and a new set of spark plugs.

Also does anyone have a set of extractors near Brisbane for sale or knows where a place is to get some fitted?

Thanks,
4x4er

[MightyMouse]

Good to hear... as usual a really small thing and easily fixed ONCE YOU KNOW WHAT IT IS :-)