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[JamesV6CDX]

3.2 V6

I am running Stag 300, with dual output KME gold and fast flow Magic Jet injectors. Pulls to the red line with no issues at all.

Since converting to manual, I am noticing that at idle, it's revving to high. It will often just sit at 1500 to 2000 rpm in neutral.

If you switch to petrol, after a short while it doesn't do it at all, at any time. On gas - it does.

I've been through and checked there are absolutely no air leaks.

The pressure is 1.05 bar and nozzle size is 2.5mm. Fuel maps ok.

Any advice would be much appreciated!

I also get fuel trim bank 2 code quite a lot.

I suspect this has always been a problem, but wasn't really noticible with the auto transmission, which would have just swallowed up those revs.

Any suggestions?

[Lazydocker]

Cant think of any reason for it to do it on LPG and not on petrol... After all, it's the petrol ecu that's controlling it

Have you done a full calibration since converting to manual?

[TheBoy]

What are the trims doing at idle on LPG (may need to watch them for 15mins or so).

Suspect the map is out at idle

[zirk]

My 3.2 LPG Manual (although never was an Auto) did something similar a few months back, pulled off the Motorway from a long run and noticed it was idling high about 1300rpm but was fine on petrol, did a few times over the next day or so after a longish run.

I dissed the battery over night and run of petrol for a day or so, its been fine on LPG ever since (apart from another recent problem which is not related), so might be worth a shot give the main ECU a reset with battery off.

Chris.

 

[Kevin Wood]

What are the trims doing at idle on LPG (may need to watch them for 15mins or so).

Suspect the map is out at idle

I have seen manual DBW cars do this when the MAF is out, so I would agree that a mixture issue might also do it. As said, fuel trims would be interesting.

[feeutfo]

Is 2.5 nozzle size not too big, btw?

[Lazydocker]

Is 2.5 nozzle size not too big, btw?

Don't know with those Magic injectors

[JamesV6CDX]

Yep all calibrated etc. Lines overlay each other perfectly.

Didn't start calibration, or gather the petrol curve, until it had run on petrol for 500 miles and trims were solid.. I then mapped it.

Took minimal adjustments..

[Lazydocker]

Check codes and trims then... Pay attention to the trims at idle on both fuels.

Does it do it all the time or only occasionally? Under what circumstances/Can you replicate it?

[Kevin Wood]

Might also be worth checking the MAF output at hot idle, everything turned off. typically 12Kg/h or so.