Egnine misfiring in the morning

giorgos3924 · 11-11-2012, 02:46 PM

I have hyundai accent 2005 1341cc 86hp, with BRC LPG kit.
When i start the car at the morning, the engine misfiring around 500rpm for a few second (5sec-10sec)
sometimes the engine start ok in the 1100rpm - 1200rpm
and when i touch the accelerator then misfiring again!

The car have 133.000km (11.000km with LPG).
I have replace the petrol filter 2 days ago and the all electric system without multiplier.
I have clean throttle valve and the injectors with stp cleaner.

giorgos3924 · 11-11-2012, 03:12 PM

"in the morning" i mean "cold engine"

Albinus · 11-11-2012, 09:36 PM

I'm not sure what your LPG setup is there, but over here on cold starts most people start the car on unleaded, then once it's warmed up a little switch over to LPG. Cars that are designed for LPG from the factory (such as the Ford Falcon) don't have this issue - just the converted ones.

giorgos3924 · 11-12-2012, 06:13 AM

yes! of course! the engine start ALWAYS with unleaded! the problem there's in the cold start with unleaded! always!

Albinus · 11-12-2012, 07:58 PM

How's the condition of your spark plugs? LPG tends to overheat many plugs as it's a higher octane fuel, causing you to replace them more frequently. Use a voltmeter to check the resistance of your ignition leads while you're at it.

01Accent16 · 11-13-2012, 08:06 AM

My Hyundai Accent does the same thing on a chilled moist morning. When you start it, it will idle low, sputter and shake like a misfire, idle up and then down and does the same thing again. It only does that like 2 or 3 times. I believe it's moisture in the gas tank or something like that. run a can of dry gas thru her.

giorgos3924 · 11-13-2012, 01:59 PM

i have replace the spark plugs ~1000km, 10 days ago! and the problem there's still! no one difference! i use stp cleaner in unleaded tank! i have run for 250km! no difference again in the next morning... i replace the unleaded filter with no difference again!

01Accent16 · 11-13-2012, 02:48 PM

moisture on the contacts or plug wires?

giorgos3924 · 11-13-2012, 03:31 PM

i don't know! i don't check it! how can i check it?
the problem there's 6 months! Until now!

giorgos3924 · 11-15-2012, 12:52 AM

there's a case to be o2 sensor or maf??
multiplier maybe?
my fuel trims in lpg is to close in the unleaded! horsepower is the same!

11-11-2012, 02:46 PM	#1 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	Egnine misfiring in the morning I have hyundai accent 2005 1341cc 86hp, with BRC LPG kit. When i start the car at the morning, the engine misfiring around 500rpm for a few second (5sec-10sec) sometimes the engine start ok in the 1100rpm - 1200rpm and when i touch the accelerator then misfiring again! The car have 133.000km (11.000km with LPG). I have replace the petrol filter 2 days ago and the all electric system without multiplier. I have clean throttle valve and the injectors with stp cleaner.

11-11-2012, 03:12 PM	#2 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	"in the morning" i mean "cold engine"

11-11-2012, 09:36 PM	#3 (permalink)
Albinus Senior Member Join Date: Oct 2012 Location: Greenmount, QLD, Australia Drives '09 HD Elantra 2.0L G4GC Drives '01 Accent 1.5L G4FK (RIP) Posts: 138	I'm not sure what your LPG setup is there, but over here on cold starts most people start the car on unleaded, then once it's warmed up a little switch over to LPG. Cars that are designed for LPG from the factory (such as the Ford Falcon) don't have this issue - just the converted ones.

11-12-2012, 06:13 AM	#4 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	yes! of course! the engine start ALWAYS with unleaded! the problem there's in the cold start with unleaded! always!

11-12-2012, 07:58 PM	#5 (permalink)
Albinus Senior Member Join Date: Oct 2012 Location: Greenmount, QLD, Australia Drives '09 HD Elantra 2.0L G4GC Drives '01 Accent 1.5L G4FK (RIP) Posts: 138	How's the condition of your spark plugs? LPG tends to overheat many plugs as it's a higher octane fuel, causing you to replace them more frequently. Use a voltmeter to check the resistance of your ignition leads while you're at it.

11-13-2012, 08:06 AM	#6 (permalink)
01Accent16 Member Join Date: Sep 2010 Location: NY Drives 01' Accent GS 1.6 DOHC Posts: 83	My Hyundai Accent does the same thing on a chilled moist morning. When you start it, it will idle low, sputter and shake like a misfire, idle up and then down and does the same thing again. It only does that like 2 or 3 times. I believe it's moisture in the gas tank or something like that. run a can of dry gas thru her.

11-13-2012, 01:59 PM	#7 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	i have replace the spark plugs ~1000km, 10 days ago! and the problem there's still! no one difference! i use stp cleaner in unleaded tank! i have run for 250km! no difference again in the next morning... i replace the unleaded filter with no difference again!

11-13-2012, 02:48 PM	#8 (permalink)
01Accent16 Member Join Date: Sep 2010 Location: NY Drives 01' Accent GS 1.6 DOHC Posts: 83	moisture on the contacts or plug wires?

11-13-2012, 03:31 PM	#9 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	i don't know! i don't check it! how can i check it? the problem there's 6 months! Until now!

11-15-2012, 12:52 AM	#10 (permalink)
giorgos3924 Junior Member Join Date: Nov 2012 Location: Greece hyundai accent 2005 Posts: 18	there's a case to be o2 sensor or maf?? multiplier maybe? my fuel trims in lpg is to close in the unleaded! horsepower is the same!

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