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Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Honda
Satisfied Customers: 3969
Experience:  Owner at Carolina Auto service & Sales , 20 years Experience in Foreign & Domestic vehicles
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All engine misfire when is cold only, random 99797, 2007,

Customer Question

all engine misfire when is cold only
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: random 99797
JA: What is the model/year of your Honda?
Customer: 2007
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: new coils spak plugs
JA: Anything else you want the mechanic to know before I connect you?
Customer: only misfires when is cold in the mornings i turn off than turn on flashing engine light goes off
Submitted: 10 months ago.
Category: Honda
Expert:  Chad Farhat replied 10 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 10 months ago.

Hey how are you

1- when cold the ecm taking air fuel ration valus from map, maf & ect sensor aftr warm up it switches to oxygen sensor .

2- on diagnostic scanner ,

1-Get me Fuel trims reading & long term & short term fuel trims, they will read from - 25 % to + 25 %. what is yours at cold engine

2-Fuel status when cold : is it at open loop & when it warms up is it switching to closed loop

3- oxygen sensor upstream readings, are they switching from 0.1 to 0.9 volts

4- check vacuum leaks , spray starting fluid on cold engine around intake manifold does it surge up ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 10 months ago.
ok i will
take a look tomorrow
Customer: replied 10 months ago.
i need to see my friend he has the scanner
Expert:  Chad Farhat replied 10 months ago.

ok sounds good

Just let me know when you get them & post them back here for me .

I m online from 10 am till late daily

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Thank You
Chad Farhat
ASE Certified Technician