Check Engine and Fluctuating RPM

**robgowild** · March 26th, 2015 07:04 PM

Guys please help kung ano kaya ang problem sa car ko, its Mazda 3 2006. I change the engine oil, air filter and spark plugs last week. So for that day ang ganda ng takbo smooth at lakas ng hatak. Now after a day of use coming from a short trip I started the car again and nag start naman without any problem but the CEL came on. So I checked everything wala naman ako nakita problem. I decided to reset it by removing the negative battery terminal. After that nawala naman yung check engine. Then after parking the car for hours sa mall inistart ko ulit then the RPM fluctuates while idle then namatay yung engine. I started the car again and this time okay na with no check engine light (this happen twice). Now after that everytime I started the car for the first time (cold start) the RPM fluctuates and parang mamamatay so I step on the gas to raise the RPM. Pag itinatakbo ko yung car ngayon ang hina ng hatak nya unlike nung 1st day ma tune up.

Now the problem is the check engine light is on again but I did not experience the fluctuating idle na namamatay makina pag cold start. I checked the laser irridium spark plug installed is right. After holy week ko pa mapa check yung car kasi eh.

Any ideas po kung ano problem? TIA

**go-to-guy** · March 26th, 2015 07:10 PM

if the check engine light turns on it's better to have it checked with a scanner para masabi kung ano talaga problem. Yung Civic ko nag-check engine last week & I had it checked sa Servitek, ang mahal nga lang, P950. It showed that I have to replace the Throttle Position Sensor. Nangyayari naman sa Civic ko is it jerks at times.

just to add: the check engine light has to be on when having it checked with a scanner.

**jaypee10** · March 28th, 2015 04:12 PM

wag ka muna mag reset .mag tanggal ng battery kapag papa scan mo na para mabasa ung anong sensor ang nagloloko.

**raycon_24** · March 28th, 2015 07:16 PM

madalas sira nyan ect sensor or thermostat ........ check mo kung puno naman coolant mo or baka nahugot wire https://www.ifixit.com/Answers/View/...0126+%26+P0128

*go-to-guy madali lang DIY pano retriece CEL code ng hondaCheck Engine Light codes (CEL) Diagnostic Trouble Codes (DTC) Malfunction Indicator Light (MIL) and - Honda-Tech

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madalas sira nyan ect sensor or thermostat ........ check mo kung puno naman coolant mo or baka nahugot wire https://www.ifixit.com/Answers/View/...0126+%26+P0128

*go-to-guy madali lang DIY pano retriece CEL code ng hondaCheck Engine Light codes (CEL) Diagnostic Trouble Codes (DTC) Malfunction Indicator Light (MIL) and - Honda-Tech

**jick.cejoco** · March 28th, 2015 07:24 PM

Looks like you need to go-to-somebody who knows

Check you IAC( idle air control) or clean it and reset. Also do a TPS sweep if you have access to a digital storage oscilloscope

**rodetor** · March 28th, 2015 11:57 PM

Did you replace your engine oil filter, when you had your oil changed? Or not?

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**rodetor** · March 29th, 2015 12:00 AM

You mentioned only, you had change your AIR FILTER.

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**rodetor** · March 29th, 2015 12:05 AM

Did you replace your OIL FILTER, when you made an Oil Changed?

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**ricciboy** · March 29th, 2015 05:13 AM

sir let the casa check your speed sensor

**jick.cejoco** · March 31st, 2015 04:59 AM

Originally Posted by ricciboy

sir let the casa check your speed sensor

Speed sensors are input to the PCM as one of the enable criteria for O/D, power door lock, transmission/transaxle upshift/downshift, evaporative emission canister purge and antilock brakes. I do not understand nor have not experienced the speed sensor input for engine speed control