[yogeshnaik]

Suggest to have your Fuel tank and supply lines are cleaned. There might be water/rust/due to bad fuel. After cleaning, use fuel at proper petrol bunk like Shell, pure for sure. Change the oil filter.
Secondly, ensure the the injectors are properly cleaned once again. Bad fuel/rust in tank can block the injectors once again. So suggest to re-clean the injectors. Clean the spark plugs once again (no need to change).
Lastly, if misfire happens, try to check at what rpm it happens. Start the vehicle, slowly raise the rpm approximately increasing the rpm in steps of 10rpm/20 seconds starting from idiling position. at one point you might find the misfire. Note it down, this might be the problem of ECU. If so get the ECU remapped.
Happy debugging

[Otto]

Can you provide some links to pictures of dirty injectors? All this while I was under the impression that the deposit was taking place inside the injector nozzle & restricting the orifice!

These are the ones I could get from a simple google search, but they're pretty much what I was talking about.

[nura]

@yogeshnaik
Thanks for your suggestions. I drove the car about 70 km today. No knocking or misfiring at all.
@Otto
Thanks for the pictures. They are cool & illustrate the point you had made very well.

[RHCP]

Hi all TBHPians,
I have been facing identical problem on my santro...the cars runs fine on a cold start for about 15mins and then starts giving the jhatkas as mentioned by everyone.i have already tried replacing the plugs and plugwires. The workshop thinks its a problem with ignition coil. on scanning it reported camshaft sensor malfunction..
Experts pls suggest on above...and typically how much would the ignition coil n sensor cost ??.
P.S just before this problem started, i had engine overheating problem due to crack in radiator hose pipe.

[akshaymahajan]

Reviving an old thread

I have a 2007 Santro run 125k+ kms. It has been running on CNG since the last 85k kms without any issues.

Since the last couple of months, I have been facing a lot of issues with it.

One of the 4 spark plugs has been fried (shorted) three times in the last 2 months (random loud 'phat' sound from the engine at low revs). It is always the same one. This causes engine to miss and hence the pick up has taken a drastic hit.

The air filter has been replaced, the throttle body and injectors cleaned, but still the same issue.

The car isnt running at its best even on Petrol but CNG just amplifies the problem multi fold.

After reading around, I want to say that its an ignition coil problem and that needs to be changed. However, the mechanic I showed it to says its because of the spark plug wires and replacing those would solve the issue.

All pointers will be appreciated. And if you have a patient mechanic in the western side of Delhi, recommendations are welcome as well.

[fast_elegance]

Bumping an old thread.

We have a 2008 Santro xing. Car was recently serviced and the service center had suggested a MAP sensor replacement due to an occassional jerk that we complained about. We decided not to get this sensor changed at this point as the jerk was very occassional and not worrying.

We got the AC serviced from an outiside ac specialist recently and now there is a strange problem.

Whenever the headlight is turned on, the car starts jerking very badly. There is no such issue otherwise. Showed it to Hyundai ASS and they have now again mentioned that it is a faulty MAP sensor and costs approx. 4k.

I am unable to relate how this issue cropped up and became so intense after the ac service. That too only when the headlights are switched on. This issue previously was not connected to the headlight being on.

Can someone here help me understand if the diagnosis by HASS is correct based on the symptoms? I know this thread has suggestions for checking the spark plugs and cables. These were already done.

Thanks.

[vsaravind007]

Originally Posted by fast_elegance

Bumping an old thread.

We have a 2008 Santro xing. Car was recently serviced and the service center had suggested a MAP sensor replacement due to an occassional jerk that we complained about. We decided not to get this sensor changed at this point as the jerk was very occassional and not worrying.

We got the AC serviced from an outiside ac specialist recently and now there is a strange problem.

Whenever the headlight is turned on, the car starts jerking very badly. There is no such issue otherwise. Showed it to Hyundai ASS and they have now again mentioned that it is a faulty MAP sensor and costs approx. 4k.

I am unable to relate how this issue cropped up and became so intense after the ac service. That too only when the headlights are switched on. This issue previously was not connected to the headlight being on.

Can someone here help me understand if the diagnosis by HASS is correct based on the symptoms? I know this thread has suggestions for checking the spark plugs and cables. These were already done.

Thanks.

Hi fast_elegance, I'd suggest you checking your battery. This seems like something related to the electrical system of the car. It'll be better if you check the alternator(especially the regulator that is in it). This isn't related to the MAP sensor I believe, it could affect your gas mileage though.

[fast_elegance]

Originally Posted by vsaravind007

Hi fast_elegance, I'd suggest you checking your battery. This seems like something related to the electrical system of the car. It'll be better if you check the alternator(especially the regulator that is in it). This isn't related to the MAP sensor I believe, it could affect your gas mileage though.

Thank you very much.

A quick update. Tested the car with a fully healthy battery from a FNG. The missing issue seems to be gone. So now it is confirmed that the issue is with the battery. The diagnosis tool at HASS did indicate an error related to MAP sensor. May be there is an issue with the sensor as well.

Next step is to replace the battery and then take the car to HASS and check if the error still exists. If yes, will get the MAP sensor replaced.

[Naveen_0181]

Originally Posted by fast_elegance

Thank you very much.

A quick update. Tested the car with a fully healthy battery from a FNG. The missing issue seems to be gone. So now it is confirmed that the issue is with the battery. The diagnosis tool at HASS did indicate an error related to MAP sensor. May be there is an issue with the sensor as well.

Next step is to replace the battery and then take the car to HASS and check if the error still exists. If yes, will get the MAP sensor replaced.

I would also suggest to get the alternator checked, a new healthy battery may solve the issue temporarily, if your alternator is not doing its best job then the battery health will go down soon. Alternators have wear and tear parts which could deteriorate with the usage!

[AutoInt]

I have 2004 Santro Xing XG with 92k mileage. As part of the process to renew the registration certificate I have done server with Trident Hyundai in Bangalore. Service advisor mentioned there is a lose connection for the Camshaft Position Sensor coupler and he has tapped it temporarily as the entire wiring harness would cost about 9000 INR.

Today while driving the car I noticed that car would not accelerate for the accelerator inputs for a brief time period and it appeared two to three times in a span of 2 KM and after that it disappeared. I took the car to the service center, the service advisor took a test drive and problem did not appear, he again insisted that it is due to the lose connection of CMP (Camshaft Position) Sensor coupler, no other problem and he asked me to get the coupler from outside and he will fix it free of cost.


Need help where I can get the Camshaft Position Sensor Coupler (CMP Sensor Coupler).


Thank you in advance.

[scorpian]

I doubt you would get the coupler only as its a integral part of wiring itself. You may have to look out for scrapped cars and lay your hands on the coupler.
If not then you have no option but to replace the affected wiring harness for peace of mind.

[AutoInt]

Originally Posted by scorpian

I doubt you would get the coupler only as its a integral part of wiring itself. You may have to look out for scrapped cars and lay your hands on the coupler.
If not then you have no option but to replace the affected wiring harness for peace of mind.

Thank you for your quick response. I am also not hopeful, but thought of giving it it a try to get a coupler before going ahead with the wiring harness.