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

[Jeh]

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]

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

[t2erns]

yun nga sinabi ko before na may air leak na hindi namemetro o nasusukat ng maf sensor kaya may endency na mag stall or bumaba engine rpm. yung iat check mo connector kaya nag high voltage pag poor contact ang nababasa ng ecu ay yung pull-up voltage nya na usually ay 5v.
Please wag mo bitayin ang maf sensor mo, nagsasabi lang ng totoo yan (analyze the dtc).
tip: pag may air leak
MAF system bababa ang rpm or mag stall system
MAP system (speed density) pag may air leak tataas engine rpm

[Jeh]

Mga paps! Update ko kayo.

Changed again another IACV. Also changed airbox and intake tube. Replaced O-ring sa MAF din and then ensured walang vacuum leak by spraying carb cleaner (ok naman results).

Started the engine, warmed up and napansin ko sobrang stable na ng rpm ko. Steady lang. Even with aircon on.

Still nung tumagal na nakabukas, engine stalls at idle and with aircon. Now, parang nagworsen pa, upon stalling, di na sya start agad. Either hard starting or wont start at all.

Tried to changed cam sensor sana kung ito possible cause kasi last palit nito is like 2005 pa. So i bought one in fordland, Pero ayaw umandar. Puro crank lang. So i said to fordland defective, now pinalitan nila (grayish updated version). Ayaw padin. Bakit ganun? Isnt it supposedly plug and play lang ang pagpalit ng camshaft sensor?

Tapos dun sa stalling problem ko, halos napalitan ko na lahat eh. Ano pa pede icheck guys? How about aircon system? Related kaya dun?

I have read in international forums din na baga computer box na ang sira? Pano po ba pinapacheck ang computer box? Problem kasi is di ko naitatakbo ng malayo kotse para madala sa reputable shop. Okay sana if within makati.

I am running out of options here mga sir. And possibly money. Hehe. Need your sincerest advsie.

Kung may makakapagdiagnose lang sana.


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[t2erns]

original pa ba set up ng ac system mo? baka hindi nadedetect ng pcm ang engagement ng compressor kaya hindi na aadjust idle speed. dito sa makati shop namin hindi ko naman ma recommend dahil malupit sa singilan amo ko he he

[Jeh]

original pa ba set up ng ac system mo? baka hindi nadedetect ng pcm ang engagement ng compressor kaya hindi na aadjust idle speed. dito sa makati shop namin hindi ko naman ma recommend dahil malupit sa singilan amo ko he he

Hehe thanks sir. Mukhang orig settings pa naman po. Ang nangyari kasi, may time na nawalan na ng lamig yung ac, kaya ngpalinis narin ako at nagpalagay ng freon. I cant really recall kung dun nagstart yung symptom. Ano po ba effect if namali yung high and low pressure settings? May effect po ba yun?

Tapos sir, naka dalawang kuha na ako ng camshaft sensor, at di gumagana sakin? Ang alam ko kaso plug and play lang yun. Possible kayang defective pareho? As of the moment may kausap na ako fellow lynx owner na ittry ko nabili kong sensor kung gagana sa kanya. Sa wed pa kami magkikita.

San shop nyo bossing?


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[t2erns]

yun iba kasing gumagawa ac pag hindi na napagana compressor nilalagyan na lang thermostat and pag nabago na set up hindi na na aadjust ng pcm un idle speed (hindi nadedetect ang pag on ng ac) kaya may tsansa na mamatay. un high pressure land nakaka apekto kasi nahihirapan engine pag mabigat na compression ng compressor.

btw dito lang kami p ocampo, san antonio village

[oj88]

Nobody mentioned if this car is equipped with an EGR valve and whether or not it has been diagnosed or replaced.

[Jeh]

yun iba kasing gumagawa ac pag hindi na napagana compressor nilalagyan na lang thermostat and pag nabago na set up hindi na na aadjust ng pcm un idle speed (hindi nadedetect ang pag on ng ac) kaya may tsansa na mamatay. un high pressure land nakaka apekto kasi nahihirapan engine pag mabigat na compression ng compressor.

btw dito lang kami p ocampo, san antonio village

Ito siguro isusunod kong icheck sir. For now, hintayin ko ulit ika-3rd replacement ko ng nabili ko na camshaft sensor. Ayaw kasi umandar dun sa dalawang ipinalit. Once andar, test drive then check if nawawala stalling. If hindi nawala, will further check other components ulit.

Crankshaft sensor at TPS nalang di napapalitan. [emoji24]


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