(Help) Honda City iDsi Misfiring on CNG

[sk_020]

Advancer is the culprit. I'm facing exact same problem in my city and I had taken a panga with advancer due to which it had gone mad and car started giving a big jerk as u explained on downshifting and sometimes on shifting up.
go to CNG mechanic. Take a test drive with new advancer. If you feel any difference. then it is surely advancer.

[fawadakbarkhan]

Thanks for the explanation bro!!

BTW, how did u tune it? Was yours 2 in 1 setup? I did tune the advancer according to a v.useful thread posted on PW. I guess I messed it up more.

[fawadakbarkhan]

BUMP for anyone else who might have an answer.

[sk_020]

Thanks for the explanation bro!!

BTW, how did u tune it? Was yours 2 in 1 setup? I did tune the advancer according to a v.useful thread posted on PW. I guess I messed it up more.

No problem bro.
I think you have followed a tomasetto advancer thread. I did the same and ended up ruining the advancer. I don't know whether it is 2 in 1 or else. I was setting it's timing. Which ruined the advancer. A happy 5-6k ka kharcha muft ka..

[argtr65]

It might be due to oil in cng kit,get it checked.

[hash4u]

backfiring can be due to bad plugs
or advancer
since this car has no plug wires or distributor we can rule that out(and assuming car is fine on petrol)
do check advancer wiring/fuses etc before opting for replacement

[ShAgY102]

Check Plugs and Plug Wires plus check air filter too. Usually advancer does this type of problem get it diagnosed from a good CNG technician or I suggest to take advancer out install the desi T bolt and then see if happens? I highly recommend use of advancer and use Manual T bolt for only a few kms to check.

[fawadakbarkhan]

No problem bro.
I think you have followed a tomasetto advancer thread. I did the same and ended up ruining the advancer. I don't know whether it is 2 in 1 or else. I was setting it's timing. Which ruined the advancer. A happy 5-6k ka kharcha muft ka..

haha, yes exactly. I followed it as well. Btw this silver city in ur dp was involved? or some other city?

and yaar, I don't know if tuning can ruin an advancer. :S

[fawadakbarkhan]

BUMP guyz, still need help, advancer installed in corolla GLi and used for 450kms. Not an issue. I touched 165+kph with it. Advancer is fine. Plugs are also ok.

The other day, found another bad fuse jacket, wasn't THAT bad but still got it replaced. Now the issue is that car doesn't idle on CNG while cold.

As soon as engine reaches optimum temp, it becomes fine. But misfiring has almost gone, now there are small lags in acceleration. one can feel that the car lost its power for about a second or so and came back to life.

[sk_020]

haha, yes exactly. I followed it as well. Btw this silver city in ur dp was involved? or some other city?

and yaar, I don't know if tuning can ruin an advancer. :S

YEah. the city in my dp was involved. Got it cnged couple of months back.

[sk_020]

BUMP guyz, still need help, advancer installed in corolla GLi and used for 450kms. Not an issue. I touched 165+kph with it. Advancer is fine. Plugs are also ok.

The other day, found another bad fuse jacket, wasn't THAT bad but still got it replaced. Now the issue is that car doesn't idle on CNG while cold.

As soon as engine reaches optimum temp, it becomes fine. But misfiring has almost gone, now there are small lags in acceleration. one can feel that the car lost its power for about a second or so and came back to life.

Most probably throttle body needs service.

[umair94]

I was facing a similar issue with my Cultus. First I got air filter changed and got the CNG kit serviced.(Oil removal procedure) But that didn't help much. Then I got tappets adjusted, Plug wires and Spark Plugs changed and problem was solved.

Might be different for ur car but u can give these things a check

[fawadakbarkhan]

Most probably throttle body needs service.

But its perfect on petrol? The issue is only on CNG, started a few days back. Before that I could easily kill a GLi with this car.

[fawadakbarkhan]

Carby cultus or Efi? and don't you think the issue if realted to tappets n stuff should be on petrol as well?

I was facing a similar issue with my Cultus. First I got air filter changed and got the CNG kit serviced.(Oil removal procedure) But that didn't help much. Then I got tappets adjusted, Plug wires and Spark Plugs changed and problem was solved.

Might be different for ur car but u can give these things a check

[fawadakbarkhan]

BUMP!!! Help

[Durrani_45]

bro get ur cng removed ur engines life is getting less day by day due to cng btw its idsi cng ki kiya zarorat hai apko shehzaday

[Rex_K]

^^^

Durrani Bhai, Koi hum jesa Petrol afford nae kr skta. Har koi Durrani thori hota hai. Ap tu apni car Jet fuel pr bhi chala sktay ho.

[hash4u]

then adjust gas flow screw for the lag
and the iddle screw on reducer to fine tune it
if that doesnt work, kit has its own choke, that might need to be fixed

[umair94]

Carby cultus or Efi? and don't you think the issue if realted to tappets n stuff should be on petrol as well?

Efi cultus. Jus Tappets didnt help the situation either. Main culprit were the wires, and plugs had to be changed anyways. Car was jus doin on CNG only so i wasnt accepting all the wires need changing thing either. Then the mechanic proved it by putting some borrowed wires. Dont know the logic or reasoning behind this but it solved the issue. Mechanic also said tappets can also cause it but failed to explain y only on CNG

[coolsmart]

@ROBM
should have posted on fan club. wts the current status and how it was resolved.
My city was also missing on CNG and sometime would die. On petrol it was fine. After tappet setting from an almashoor tuner and TB,spk plg cleaning, the car has become very light and gained power. It was also not speeding on CNG before.