Low idle on LPG
Submitted: Sunday, Dec 24, 2006 at 08:26
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Ron George
Good morning & merry xmas to all. I`ve got a little prob.with gas [the LPG type] had a re calibration the other day, every thing ok, a few days later a
backfire on starting, nothing unusual there does it occasionally with no probs, but this time the idle has dropped right off to the point of stalling. A couple of Qs. On the side of the converter there are two screws, the top one has a set spring under it, the bottom one hasn’t. One is the mixture control & the other is the idle speed control… which one is which????? The converter I believe is manufactured in Holland, I couldn`t tell you the brand without pulling it off!!!
Could this particular prob be related to the
backfire? as I`ve mentioned previously it has never created a prob when it occurred until now, & that`s assuming that the
backfire caused the prob in the first instance, or, could it just be sheer coincidence that the prob was caused by something else at the same time as the
backfire????
Advice please, conspiracy theories & all accepted. Cheers RG.
Reply By: johnny - Sunday, Dec 24, 2006 at 12:44
Sunday, Dec 24, 2006 at 12:44
just a thought i had a car that used to do that
check the air filter box some time it can unclip them when it back fires creating no resitance so it just sucking in air with no filter which can drop revs
AnswerID:
211885
Reply By: Member - Tour Boy- Sunday, Dec 24, 2006 at 19:03
Sunday, Dec 24, 2006 at 19:03
Hi RG,
if your vehicle is fuel injected ,
backfire WILL damage the air flow sensor so start it on petrol always then switch it over a couple of secs after starting. If you start an lpg vehicle with a bit of throttle there is a very real chance of
backfire.
If it is a carby vehicle the
backfire is far less damaging but have it checked anyway especially if it has only started recently.
The last 3 lpg vehicles I've owned, all different brands of systems and NONE of them idle when cold always have to use the hand throttle. 2 x carby and 1 x injected system. If you destroy your air flow sensor they are up to $900 plus the tow!!
But I wouldn't be without one.
Regards
Tour Boy
AnswerID:
211926
Reply By: prado_95 - Wednesday, Dec 27, 2006 at 19:07
Wednesday, Dec 27, 2006 at 19:07
Since we dont know the specific vehicle, I doubt you will get a specific response.
However a
backfire is usually a result of running too lean, or too advanced.
Backfire on vane type airflow meters will result in a vehicle that wont run at low revs, poorly at high revs, and over $450 for a remanufactured meter (think around $900 from the dealer when they get one in).
Take the car to an LPG specialist, preferably one with a dyno and have it adjusted properly ( guessitmate settings / low engne load settings are used by most installers). Doing just that improved my on road power by 15Kw and improved economy by about 18%.
AnswerID:
212213