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Odd behaviour on tickover and acceleration.

Rob Edge
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22 Dec 2011 19:13 - 22 Dec 2011 19:14 #28965 by Rob Edge

Odd behaviour on tickover and acceleration. was created by Rob Edge

Symptoms:
Occasionally and I mean now and then, when accelerating it feels a bit fuel starved but if you lift off it recovers. At the next junction it will pick up from 750 to 1500 rpm three times then behave normal. I am borrowing a Snap On code reader but anyone got any ideas.
Can't complain because it returned 29.2mpg on average this week.

Last edit: 22 Dec 2011 19:14 by Rob Edge.

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Municipal Waste
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22 Dec 2011 21:15 #29003 by Municipal Waste

Replied by Municipal Waste on topic Re: Odd behaviour on tickover and acceleration.

I actually managed to get above 30mpg the other week, another Jimny first I'm sure :dry:

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Rob Edge
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23 Dec 2011 12:33 #29048 by Rob Edge

Replied by Rob Edge on topic Re: Odd behaviour on tickover and acceleration.

Cleaned all of the visible connections on electrics and took out the pcv valve. Full of gunk so cleaned it with isopropanol and it is now free flowing one way only. Time will tell.

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facade
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23 Dec 2011 19:04 #29112 by facade

Replied by facade on topic Re: Odd behaviour on tickover and acceleration.

Good choice, isopropanol, IPA or propan-2-ol is used as a fuel additive to pick up any water in the tank, so it shouldn't hurt anything.

It is also used in tape head cleaner and windscreen de-icer sprays.

For the price you might as well buy a new pcv valve though, they do cause idle problems when sticky.

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there

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Foxtrot
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25 Dec 2011 19:41 #29207 by Foxtrot

Replied by Foxtrot on topic Re: Odd behaviour on tickover and acceleration.

Hi Rob, I had the same problem with the PCV valve, for only Ãƒâ€šÃ‚Â£17.00 I would change it out to make sure you have nailed it, a lot of technical threads consider a PCV valve as a consumable item and should be changed out at regular intervals.

see my thread below, there is a good link attached which I found, it explains what a PCV valve does and the symptoms when faulty.

www.bigjimny.com/index.php?option=com_ku...7&id=27129&Itemid=75

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Rob Edge
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26 Dec 2011 18:54 #29252 by Rob Edge

Replied by Rob Edge on topic Re: Odd behaviour on tickover and acceleration.

The problem has now gone away but on cold start it tends to rise and fall for about 30 seconds. What controls the cold start tickover and where is it on a single cam. I want to disconnect it to test a theory.

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Odd behaviour on tickover and acceleration.

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