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GQ with erratic idle ...

Tech Talk for Nissan owners.

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RN
A speed camera would have prevented that!
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Joined: Sat Feb 05, 2005 3:46 pm
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GQ with erratic idle ...

Post by RN »

One of my work colleagues informed me that he is having problem with his early GQ. I told him to post the symptoms to me and I would post it on OL...can someone offer any assistance to this problem...He wrote:


"Further to our conversation the other day the problems are as follows.

The vehicle is a 1989 GQ Nissan Patrol manual 4.2 Lt Wagon. Petrol / Gas. Just under 250,000 Kms

The problems started as flooding with petrol when switching back from being on gas. If you didn't have a fair bit of road speed up to clear the motor it would flood and stall. It was then a prick to clear & restart. This was diagnosed as a faulty needle & seat which was replaced, fixing that problem.

It then developed 2 new problems, first the fast idle takes a long while to come off. This appears to be temperature dependant as if it is a really hot day the idle is fine. The colder the outside temperature the longer it takes the idle to come off.

The second is that it periodically will not idle on when on petrol. It starts and runs fine but just dies away and stallswhen you stop. This problem will disappear for a couple of days every now & then but comes back.

The truck has been back to the guy who did the needle & seat twice and when he could no longer help me, has been off to another workshop that was highly recommended by people at work. After this guy had it the idle problem didn't change but it ran fine on petrol for about 2 weeks then the idle problem came back.

The gas system is Impco where you switch to petrol and pull the cable out. Fuel filters have been changed and the pump is fine. It will tow the caravan at highway speeds fine on petrol so fuel flow isn't the problem.

I am sure that this problem must have happened to someone on OL and I would appreciate the advice...

cheers

RN
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Post by sneaky_pete »

I had a similar problem with my carby GQ patrol, where it wouldnt idle, or idle roughly but would pretty much run fine through the rev range.

Rebuilt the carby and its been fine ever since :armsup:
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RN
A speed camera would have prevented that!
Posts: 15822
Joined: Sat Feb 05, 2005 3:46 pm
Location: Check your six.

Post by RN »

Thanks Pete,

rebuilt means for kit, gaskets etc...

I thought that his fuel mixture at idle may be sometimes being contaminated by the two fuels mixing..ie like a solenoid isn't closing off and he is get a bit of gas with his petrol...just a thought, but I will keep an open mind.
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Post by BIG GQ »

Can you organise to clear my traffic history in QLD? License # 66181907

If so I'm prepared to help :rofl: :rofl: :rofl: :rofl:


Seriously though First thing to look at is a complete carby kit as gas will often dry out seals, gaskets, etc. ;)
Cheers
Linc

[quote="chimpboy"]Punctuation is the difference between 'I helped my Uncle Jack off his horse' and 'I helped my uncle jack off his horse.'[/quote]
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User avatar
RN
A speed camera would have prevented that!
Posts: 15822
Joined: Sat Feb 05, 2005 3:46 pm
Location: Check your six.

Post by RN »

BIG GQ wrote:Can you organise to clear my traffic history in QLD? License # 66181907

If so I'm prepared to help :rofl: :rofl: :rofl: :rofl:


Seriously though First thing to look at is a complete carby kit as gas will often dry out seals, gaskets, etc. ;)
So you have some traffic history now...well do you?,.... punk... :shock:


Wave of wand..all demerits wiped. :D

Thanks for that.... :armsup:
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Post by BIG GQ »

RoadNazi wrote: So you have some traffic history now...well do you?,.... punk... :shock:
Do i what. Have a look at the history on that DL number. Although I do not DUI these days which has helped of late.
Cheers
Linc

[quote="chimpboy"]Punctuation is the difference between 'I helped my Uncle Jack off his horse' and 'I helped my uncle jack off his horse.'[/quote]
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User avatar
RN
A speed camera would have prevented that!
Posts: 15822
Joined: Sat Feb 05, 2005 3:46 pm
Location: Check your six.

Post by RN »

BIG GQ wrote:
RoadNazi wrote: So you have some traffic history now...well do you?,.... punk... :shock:
Do i what. Have a look at the history on that DL number. Although I do not DUI these days which has helped of late.
I don't mix business with pleasure...your secret is your secret. ;)
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Joined: Sat Apr 24, 2004 10:17 am
Location: Gold coast QLD

Post by Madmac »

my TB42 runs fine onroad but as soon as i hit a few bumps offroad the idle goes up the shit, ive been told that its crap from the float chamber that gets into the jets. last time i just reversed a couple of plug leads and let it backfire a couple of times and it came good, im currently running some fuel additives to try and clear all the crap out.
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