[Need Help] Ford Lynx - Engine misfires and stalls at Idle when engine is warm (worst if with A/C)

**sirkosero** · September 17th, 2016 10:44 PM

Mukhang stored code yan kung di naman nakailas CEL

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**Jeh** · September 17th, 2016 11:16 PM

Originally Posted by sirkosero

Mukhang stored code yan kung di naman nakailas CEL

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Problem sir is that wala kasing CEL indicator yung lynx.

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**Janemar** · September 17th, 2016 11:49 PM

Originally Posted by Jeh

Mga sir. Eto lumabas na trouble codes.

What does this mean? Advisable bang bili agad ako maf? Or is it possible stored trouble code lang ito kasi nung hinahanap culprit eh tinanggal namin once ung MAF sensor.

After kasi iclear yung code at scan ulit, wala na lumabas na trouble codes.

Possible ba na ung stalling problem ko hindi din madetect thru trouble codes?

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High signal means short to ground

And low signal means open circuit.

Most probably dahil nga dun sa pag tangal lang ng connector. PERO, sana tsinek ng technician kung anu ang live data na reread ng IAT(ambient temp +10-20deg c. Pag maninit makina) sensor and ng MAF(sabay sa RPM pag nirev.)
mo after reset.

If abnormal pa rin, it could be the MAF nga since nandun din built in ang IAT sensor.

**jick.cejoco** · September 18th, 2016 06:05 AM

Originally Posted by Jeh

Mga sir. Eto lumabas na trouble codes.

What does this mean? Advisable bang bili agad ako maf? Or is it possible stored trouble code lang ito kasi nung hinahanap culprit eh tinanggal namin once ung MAF sensor.

After kasi iclear yung code at scan ulit, wala na lumabas na trouble codes.

Possible ba na ung stalling problem ko hindi din madetect thru trouble codes?

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Some glitches are just way too fast even to the "best" scan tool. You will need a digital storage oscilloscope to be able to see down to nano seconds. Try with a good known part if the shop doesn't have a dso or is limited in capability

**jick.cejoco** · September 18th, 2016 06:15 AM

Sometimes due to corrosion or oxidation, signals tend to be noisy "confusing" the PCM or the signal becomes too weak. One of the solutions is to apply stabilant 22 to the terminals

http://www.wurth.co.nz/cat/files/ass...s/page0054.pdf

**Jeh** · September 19th, 2016 09:04 AM

Given the above inputs, can anyone recommend me to a shop (pref. Near makati or pasay-since namamatayan ako makina), wherein kayang tyagain at hanapin sira ng kotse ko?

Yung ibang shop kasi parang proseso na kung magtrabaho eh at mukhang may isang mekaniko lang na maalam at yung iba helper lang. Pag madami na customer usually di na naaasikaso maigi. Hehe

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**Jeh** · September 19th, 2016 09:09 AM

Also, given na yung lumabas na trouble codes at yung symptoms, can i conclude na nasa air/intake area lang to?
1) faulty maf?
2) faulty wiring system sa maf, iac, tps??
3) vacuum leak?

Or may possibility paring nasa ignition, fuel or cooling system?

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**jick.cejoco** · September 19th, 2016 09:51 AM

Originally Posted by Jeh

Also, given na yung lumabas na trouble codes at yung symptoms, can i conclude na nasa air/intake area lang to?
1) faulty maf?
2) faulty wiring system sa maf, iac, tps??
3) vacuum leak?

Or may possibility paring nasa ignition, fuel or cooling system?

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since you have the diagnostic trouble codes, start from there.

check your voltages at the MAF connector

blue/black battery voltage with KOEO (key on engine off)

gray/green less than 1 volt

gray/black 1.8 volts at 20 degrees celsius
2.2 volts at 30 degrees celsius

violet/white less than 1 volt

black/orange 0.7 volts KOEO
1.3 volts after engine warm up

**Jeh** · September 19th, 2016 01:18 PM

Originally Posted by jick.cejoco

since you have the diagnostic trouble codes, start from there.

check your voltages at the MAF connector

blue/black battery voltage with KOEO (key on engine off)

gray/green less than 1 volt

gray/black 1.8 volts at 20 degrees celsius
2.2 volts at 30 degrees celsius

violet/white less than 1 volt

black/orange 0.7 volts KOEO
1.3 volts after engine warm up

Is this with the use of a multimeter? Will a cheap one work? Marami kasi nagbebenta sa lazada. If yes then i will do it myself. Hehe

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**jick.cejoco** · September 19th, 2016 02:15 PM

Originally Posted by Jeh

Is this with the use of a multimeter? Will a cheap one work? Marami kasi nagbebenta sa lazada. If yes then i will do it myself. Hehe

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not only is a good reputable digital multi tester an investment, you also need to have reliable readings for proper diagnosis. dont be so obsessed with the cheapest. you get what you pay for