Drop in RPM GQ petrol

Engines and Engine Systems
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Jules
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Re: Drop in RPM GQ petrol

Post by Jules » 31 Jan 2019 12:23

Wondering if it could not perhaps be the Ignitor system that is starting to show its age, been in my lorrie for probably 10years now
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Re: Drop in RPM GQ petrol

Post by Peter Connan » 31 Jan 2019 16:58

I very much doubt that Jules. I believe the Ignitor will either work or not work.

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Re: Drop in RPM GQ petrol

Post by bogeyman » 01 Feb 2019 13:41

Jules,
If possible , get out and look at the exhaust fumes when it misbehaves. Blackish smoke will tell you that it is getting too much fuel at idle. Float level eratic.

Another possibility is a small amount of water in the fuel. It will sit in the bottom of the float chamber and form a small droplet in front of the main jet.
When driving it will just get sucked through but at idle it will mess with the mixture.

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Re: Drop in RPM GQ petrol

Post by Jules » 04 Feb 2019 20:26

die culprit is gevind - it was a vacuum pype

I do however have a chi chi chi sound coming from it sounds like the front wheels, when I turn it disappear and when going straight it returns 😳

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Re: Drop in RPM GQ petrol

Post by iandvl » 05 Feb 2019 05:53

Jules wrote:
04 Feb 2019 20:26
die culprit is gevind - it was a vacuum pype

I do however have a chi chi chi sound coming from it sounds like the front wheels, when I turn it disappear and when going straight it returns 😳

Shalom
Glad to hear you got the culprit in terms of the carb issues.

As for the chi chi chi sound, perhaps try locking the hubs to make sure it is not an issue with them ? Not sure if your hubs are manual or auto locking, but that is generally indicative of a hub requiring maintenance on the auto locking assemblies.

Alternatively, perhaps brake pads ?

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Re: Drop in RPM GQ petrol

Post by ricster » 05 Feb 2019 09:02

The chi chi chi is possibly the old school high tech early warning system on the brake pads indicating that they are almost ready to be changed
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Re: Drop in RPM GQ petrol

Post by Michael » 08 Feb 2019 06:16

Jules wrote:
04 Feb 2019 20:26
die culprit is gevind - it was a vacuum pype

I do however have a chi chi chi sound coming from it sounds like the front wheels, when I turn it disappear and when going straight it returns 😳

Shalom
Jack one wheel up at a time and feel the wheel bearing play, you will probably find it is a bit loose and needs tightening :thumbup:
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Re: Drop in RPM GQ petrol

Post by Jules » 16 Feb 2019 16:04

Some report back, the chi chi was not the brake pad early warning system, my left wheel bearings was so loose it was scary , the culprit was the lock washer and fortunately the bearings still fine. However I am going to convert as per TourdeFrans my front bearing system from GQ to GU
73956BC1-1BE9-4EAA-BF76-88D0785ACEBA.jpeg
lock washer moertoe
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Re: Drop in RPM GQ petrol

Post by Alex Roux » 16 Feb 2019 18:38

Daai lyk redelik m**r toe vir my
Skilpad & Shortie

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Re: Drop in RPM GQ petrol

Post by ricster » 18 Feb 2019 09:03

Wow..... that must have been really loose. Pleased you caught it before it got worse, and damaged other things.
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