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Maruti Alto K10: Issues with aftermarket CNG kit installation

There is a clear lag between the accelerator being pressed and the response from the car.

BHPian BikerKeeda recently shared this with other enthusiasts.

Hi,

I recently installed a sequential CNG kit with a timing advancer in my 2013 Alto K10.

The odo was approx around 80k kms when I did the fitment. The engine is in top condition, as the car is single-hand used and maintained properly.

Issues after fitment:

When I press the gas pedal ( literally a gas pedal) at low rpms (800-1800), suddenly, the rpm goes down for a second and a half and then goes up again making the car stall. This happens whenever I want more power and want to drive with half clutch. If I press it hard, the rpm goes down and the engine stalls.

There is a clear lag between the accelerator being pressed and the response from the car.

I don't know how to put it in technical words. My apologies for the same.

The mechanic reduced the spark plug gap, but it worsened the problem. The car now shuts off at low speeds randomly. If anyone is well-versed with CNG components and their working, kindly help me find the fault. I don't want to keep revving my car hard.

Also, please suggest the spark plug gap for the Alto CNG. Will rectify it.

Thanks.

Here's what GTO had to say on the matter:

Like a turbocharger, IMHO, a CNG fitment too is best done at the factory. 2nd choice, the authorised dealer with the manufacturer's support (as with some Hyundais). But I'm no fan of after-market CNG fitments. Whether in the short-term or long-term, have only heard of problems. Plus, the tuning is never as good.


To me, factory fit is factory fit. Just look at the new Tiago / Tigor CNG. What a perfectly-executed CNG installation. The quality is something aftermarket guys can only dream of.

Here's what BHPian svsantosh had to say on the matter:

Find a better equipped CNG retrofitter in Pune. Your current mechanic knows very little about his job.


After a critical job like fuel system mod (LPG/CNG), you need to drive with the retro fitter along side with his laptop and he should tune the CNG system (2nd ECU) to suit your needs. It appears that he has set the tune to too lean to give you more than normal fuel efficiency.

You would need to drive the car, and the tuner has to tune the system based on your driving style for over 30-50 kms, both in cold start and traffic conditions and mainly WOT.

Put back original and new MGE spark plugs and drive in petrol till you find a CNG shop who can read this post and say 'yes sir, I can help you out'.

Here's what BHPian asit.kulkarni93 had to say on the matter:

Check the igniter and spark plugs. Preferably replace both of them. Clean the throttle body. Check the car on petrol after doing the above things. If it works well then take it to the CNG installer and get him to tune the kit.

Here's what BHPian Shreyans_Jain had to say on the matter:

Your installer screwed up. The tuning of the kit is not right. That’s kind of surprising, because it is very rare that someone messes up the tune of a sequential kit on a Maruti car. It’s their bread and butter! Clearly, that person didn’t know what he was doing. Take the car to another shop and let them have a go at it. I am assuming your air filter is new, throttle body is clean and the spark plugs and ignition coils are in good shape. A simple coding job with a laptop should set things right.

Check out BHPian comments for more insights and information.

 
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