Misfiring at low rpms when running on LPG.

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Re: Misfiring at low rpms when running on LPG.

Post by El_Ventu on Thu May 23, 2013 2:33 pm

I tried to change injection timing, but there are'nt differencies.

And also, changing its timing, blocks the possibility to add the gasoline contribution.

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Re: Misfiring at low rpms when running on LPG.

Post by El_Ventu on Tue Oct 01, 2013 6:56 pm

El_Ventu wrote:

Then I take a look (for the first time) at the EFI troubleshooting procedure indicated on the workshop manual.
I shorted the diagnosis contact and I read two errors, number 16 and 31...

According to the manual, I have problems on:

"code 16:Ignition signal: No ignition confirmation signal is inputted."
I must check ignition circuit, igniter and the ECU.

"Code 31:Pressure sensor:When the signal from pressure sensor becomes open or shorted"
I must check pressure sensor circuit, pressure sensor or ECU.
Done the first 20'000km on LPG, today I changed oil, filters, spark plugs etc.
Then I took a look for error codes...and Error 16 reappeared.

Hm...

I start to search on the web and in scrapyards for replacing of coil and/or igniter...

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Re: Misfiring at low rpms when running on LPG.

Post by HighlyJetted on Tue Oct 01, 2013 7:41 pm

Does your piggy back ecu interrupt the spark signal?
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Re: Misfiring at low rpms when running on LPG.

Post by El_Ventu on Sun Oct 06, 2013 8:47 pm

No, the LPG ecu doesn't interrupt the spark signal, it is connected at the coil negative.

Found some used ignition parts at over 250€...

I think I must do some modifications on it, adapting cheaper parts.

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Re: Misfiring at low rpms when running on LPG.

Post by El_Ventu on Mon Oct 07, 2013 7:18 pm

I done some regulations...
The air gap between the signal generator and the three "pins" in the distributor was too high (about 2mm!!) instead of the specified 0.2-0.4mm...Suspect Suspect 
I think this give a weak signal to the ECU...
I also shortened the ignition cables (I bought some "universal" one in march, that are too long) and re-gapped the spark plug to 0.7mm.

IT SEEMS it's running about perfectly now, but I have to do some tests... Very Happy

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Re: Misfiring at low rpms when running on LPG.

Post by HighlyJetted on Mon Oct 07, 2013 7:44 pm

I do hope you cure this misfire one day.

Misfires can be one of the hardest faults to pin down, and can be caused by multiple factors!
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Re: Misfiring at low rpms when running on LPG.

Post by El_Ventu on Wed Oct 09, 2013 5:25 pm

It seems that the problem was solved!
In addition to the tuning of thesignal generator position and the shortening of the ignition cables I ordered three bosch spark plug designed for LPG (WR7KI33S) from e-bay, I never bought these spark plugs because of the price in shops, I found it at 22-25€ each, from e-bay three pieces plus shipment less than 30€... Very Happy

For now all ok, I keep my finger crossed...

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Re: Misfiring at low rpms when running on LPG.

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