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Author Topic: Erratic Tickover - Hunting.  (Read 1033 times)

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DeRangeRC

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Erratic Tickover - Hunting.
« on: 22 July 2011, 10:19:27 »
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm  :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
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If its rusty cut it out.
If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!

Shelby

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Re: Erratic Tickover - Hunting.
« Reply #1 on: 22 July 2011, 10:27:40 »
Did you do right down to and including the breather jet (not just breather hoses)?

I had exactly the same problem on mine and after doing all the breather hoses and jet it made a world of difference.  Never stalled again and idles solidly at around 6-700 rpm.
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RobG

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Re: Erratic Tickover - Hunting.
« Reply #2 on: 22 July 2011, 10:39:23 »
Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks
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DeRangeRC

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Re: Erratic Tickover - Hunting.
« Reply #3 on: 22 July 2011, 11:11:49 »
Quote
Did you do right down to and including the breather jet (not just breather hoses)?

I had exactly the same problem on mine and after doing all the breather hoses and jet it made a world of difference.  Never stalled again and idles solidly at around 6-700 rpm.

Yeh, cleaned out IACV and the breather jet at the base of the carb.....was solid with gunk !! ??
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If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!

DeRangeRC

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Re: Erratic Tickover - Hunting.
« Reply #4 on: 22 July 2011, 11:13:32 »
Quote
Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks

You mean on the breather hoses ?
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If its rusty cut it out.
If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!

Shelby

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Re: Erratic Tickover - Hunting.
« Reply #5 on: 22 July 2011, 11:23:07 »
I would check all the main trunking is intact and connected securely.  Check the breather hoses are connected securely and have no splits, cracks etc.

Did you put a new IACV gasket on it (and throttle body gasket if you took that off) or put the old ones back on?

I am not expert  :P just comparing to what I did with mine.  I have a split in my intake trunking on the throttle body, have had to patch it up with a ton of insulting tape at the moment until I can get it replaced.
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Entwood

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Re: Erratic Tickover - Hunting.
« Reply #6 on: 22 July 2011, 11:24:14 »
Quote
Quote
Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks

You mean on the breather hoses ?

Everywhere !!!

Spray around lightly with carb cleaner whilst the engine is running, especialy vac lines and plenum... if/when the engine note suddenly changes thats the air leak .. the carb cleaner has been sucked in as unmetered fuel and the engine note changes.

Fix leak, wipe with paper towel .. result ... engine runs properly and is nice and clean to boot .. :)
« Last Edit: 22 July 2011, 11:25:07 by entwood »
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DeRangeRC

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Re: Erratic Tickover - Hunting.
« Reply #7 on: 22 July 2011, 11:30:28 »
Quote
I would check all the main trunking is intact and connected securely.  Check the breather hoses are connected securely and have no splits, cracks etc.

Did you put a new IACV gasket on it (and throttle body gasket if you took that off) or put the old ones back on?

I am not expert  :P just comparing to what I did with mine.  I have a split in my intake trunking on the throttle body, have had to patch it up with a ton of insulting tape at the moment until I can get it replaced.

Yeh new IACV gasket, didnt have the throttle body off. ?? Will be checking the Air intake now though...."where is me tape"  :)
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If its rusty cut it out.
If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!

DeRangeRC

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Re: Erratic Tickover - Hunting.
« Reply #8 on: 22 July 2011, 11:33:33 »
Quote
Quote
Quote
Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks

You mean on the breather hoses ?

Everywhere !!!

Spray around lightly with carb cleaner whilst the engine is running, especialy vac lines and plenum... if/when the engine note suddenly changes thats the air leak .. the carb cleaner has been sucked in as unmetered fuel and the engine note changes.

Fix leak, wipe with paper towel .. result ... engine runs properly and is nice and clean to boot .. :)

Cheers Entwood, Will try all that later...... and if this doesnt work what would be next ? Need to know worst case  :(

Cam cover gasket ?  :-/
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If its rusty cut it out.
If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!

Entwood

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Re: Erratic Tickover - Hunting.
« Reply #9 on: 22 July 2011, 12:18:41 »
Quote
Quote
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Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks

You mean on the breather hoses ?

Everywhere !!!

Spray around lightly with carb cleaner whilst the engine is running, especialy vac lines and plenum... if/when the engine note suddenly changes thats the air leak .. the carb cleaner has been sucked in as unmetered fuel and the engine note changes.

Fix leak, wipe with paper towel .. result ... engine runs properly and is nice and clean to boot .. :)

Cheers Entwood, Will try all that later...... and if this doesnt work what would be next ? Need to know worst case  :(

Cam cover gasket ?  :-/

Not a chance .. that will give you an oil leak outwards .not an airleak inwards.

You have disturbed a pipe/seal somewhere that is giving you an airleak. THAT is what causes hunting/erratic idling .. nowt else .. :)
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DeRangeRC

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Re: Erratic Tickover - Hunting.
« Reply #10 on: 22 July 2011, 13:09:41 »
Quote
Quote
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Quote
Quote
Quote
Sorry if this has been covered before in here but work means I only get a few minutes to look !!  ::)

After cleaning out the IACV and all relevant breathers last night (found a very good guide on here) I took her for a test run up to temp and when I pulled up on the drive the tickover fluctuates and hunts between 1000rpm & 2000 ish rpm :-[

What are the steps to diagnosis ? What would be the next thing to check ?

Good news is cleaning the IACV has stopped the intermittent stalling !! :)

Need to do some miles in her from Thurs next week and at the moment I dont trust it to the bottom of the road!!

??????
Check for air leaks

You mean on the breather hoses ?

Everywhere !!!

Spray around lightly with carb cleaner whilst the engine is running, especialy vac lines and plenum... if/when the engine note suddenly changes thats the air leak .. the carb cleaner has been sucked in as unmetered fuel and the engine note changes.

Fix leak, wipe with paper towel .. result ... engine runs properly and is nice and clean to boot .. :)

Cheers Entwood, Will try all that later...... and if this doesnt work what would be next ? Need to know worst case  :(

Cam cover gasket ?  :-/

Not a chance .. that will give you an oil leak outwards .not an airleak inwards.

You have disturbed a pipe/seal somewhere that is giving you an airleak. THAT is what causes hunting/erratic idling .. nowt else .. :)

Phew.... thats good news !! :)

Will pop out with my carb cleaner and paper towel this evening and find that leak.

OOF rules   8-)
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If its rusty cut it out.
If its dry, oil it.
If its dull, shine it.
If its stuck.......smack it with a hammer of course !!
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