What does it mean when one throttle pot is hissing air?
Discussion
Whilst balancing my throttle pots, number 6 keeps puffing out air every so often. It's enough to cause the air flow to drop from 7 to 4 briefly, and is quite a noticeable amount of air if you hold your hand a few cm in front.
Is that a misfire? There's no bang, just a puffing/hissing noise. All other cylinders are fine and I cleaned up all the ht lead connections (they're new anyway) and the little black plugs on top of each throttle pot. Car seems to run fine despite this.
Is that a misfire? There's no bang, just a puffing/hissing noise. All other cylinders are fine and I cleaned up all the ht lead connections (they're new anyway) and the little black plugs on top of each throttle pot. Car seems to run fine despite this.
Got it, thanks Pete.
When you say set to minimum, do you mean the butterflies should all be as closed as possible whilst balancing? This time I tried balancing the bodies whilst the engine was running higher rpm than previously. It gave a reading of just under 7 on the syncrometer. Number 6 is the only one behaving like this and only whilst idling (happens once every 10s or so).
When you say set to minimum, do you mean the butterflies should all be as closed as possible whilst balancing? This time I tried balancing the bodies whilst the engine was running higher rpm than previously. It gave a reading of just under 7 on the syncrometer. Number 6 is the only one behaving like this and only whilst idling (happens once every 10s or so).
That cyl is still too lean yet only 7cfm/min is going in through the throttle mouth. The other air is coming from somewhere else i.e. spindle or base flange.Sounds to me like you need this modification:
http://www.pistonheads.com/classifieds/parts-and-p...
I believe the same guy (ie me) will be selling some insulated gaskets that sit between the body and the head too....
http://www.pistonheads.com/classifieds/parts-and-p...
I believe the same guy (ie me) will be selling some insulated gaskets that sit between the body and the head too....
Ha, I've been looking at that advert a lot recently. Really love to get it done sometime. It's the time off the road whilst the weather is so nice which puts me off (my garage guy took a month to get the 12k done!).
Out of interest, once the bodies are off, how long does it take to get them back again?
Out of interest, once the bodies are off, how long does it take to get them back again?
I know what you mean about the weather. My fingers are crossed that my gearbox stays together till the end of the season!
I can have your throttle bodies back within two days from when I receive them.
It would be worthwhile using gaskets between the bodies and cylinder head while it is apart. I am working on some at the moment that can be used and re used dry and offer some heat insulation between the two parts to reduce intake temperatures.
I can have your throttle bodies back within two days from when I receive them.
It would be worthwhile using gaskets between the bodies and cylinder head while it is apart. I am working on some at the moment that can be used and re used dry and offer some heat insulation between the two parts to reduce intake temperatures.
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