Need Happy Honda Guy

Gene Owner Glendora, California Posted   Latest   Edited  
Event
Driveability
2007 Honda Accord LX 2.4L (K24A8) 5-spd (APG6)—1HGCM56877A180983
Near Stall At Idle In Gear When A/C Comes On

Hi Guys,

We have this vehicle that has a condition where the idle speed drops pretty dramatically when sitting at idle in gear and the AC clutch cycles on.

I thought we fixed this with all the mounts.

Car is 4CYL with 163,275 miles on it. (I mistakenly called out a V-6 earlier)

Car back in: Started with and alternator replacement and battery disconnect.

We have performed all over due maintenance: valve adjustment, plugs, T-body and intake clean, LOF

Relearned crank pattern, reset idle as best we know how.

Note: this car has no idle motor.

We have to be missing something, so I am tossing it to you guys for suggestions.

Thank you,

*Scott is helping me edit this post, I apologize for the lack of info on my initial post.

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Daniel Owner
Long Beach, California
Daniel
 

Whats going on with the car

+2 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Daniel, I'm working with Gene and have updated the post with more info.

+1 Ð Bounty Awarded
Justin Mobile Technician
Herriman, Utah
Justin
 

I missed the symptom here also. What is the complaint?

+1 Ð Bounty Awarded
Gary Manager
Stuart, Florida
Gary
 

What is the year, make and model also?

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Scott Manager
Claremont, California
Scott
 

Hi Gary, I'm working with Gene and have updated the post with more info.

+1 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Justin, I'm working with Gene and have updated the post with more info.

+2 Ð Bounty Awarded
Randy Curriculum Developer
Raleigh, North Carolina
Randy
 

YMM, auto vs manual, etc??? Symptom and or DTCs???

0 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Randy, I'm working with Gene and have updated the post with more info.

+1 Ð Bounty Awarded
Stephen Technician
Portland, Oregon
Stephen
 

Hello Gene, There is a TPS memory clear and idle relearn done with Honda HDS scan tool, I have also done this with Autel Maxisys. Without a factory level scan tool, try this: Clean throttle plate, disconnect battery again and touch cable together for few seconds. Then start engine and let it get fully hot without touching throttle, after fully hot rev it up and then recheck hot and cold

+1 Ð Bounty Awarded
Craig Owner
Rowland Heights, California
Craig
 

Gene, What are the A/C Head pressures when issue happens and is the field coil circuit clean when engaged ? I assume from your post the Issue only happens when the A/C is turned on?

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Gene Owner
Glendora, California
Gene
 

Hello Craig, the head pressure is about 180 psi. we have checked the charge on the a/c everything is dialed in. we notice if the fans are disconnected or if the unplug the alternator and turn on the a/c everything is nice and smooth. It seems to me the more lots on the engine the worst its felt. We checked the engine vacuum hot at idle is 21 in. in gear is about 18 in. and when the a/c is

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Avery Mechanic
Kansas City, Missouri
Avery
 

One key thing here I notice is that you stated if you disconnected or if the alternator is unpluged everything is smooth. You also mentioned that you replaced the alternator. Why was the alternator replaced originally, was this issue present the vehicle came in the first time? Is the alternator a decoupler style? Fuel trims? How are they looking?MAF at idle?

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Gene Owner
Glendora, California
Gene
 

the alternator was not charging when the vehicle came in. mass airflow is reading 2.5 grams at idle no loads. the fuel trims are about 3%.

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Randy Analyst
Denver, Colorado
Randy
 

What is the reading with ac on? Read Rudy’s reply, I have seen the same thing he is describing on another vehicle. It was failing IM240 and a shop was struggling with it. They brought it to me and first thing we noticed was it had a power issue. Long story but what happened on that one was the compressor got so hot it welded the clutch to the compressor bearing and then locked the engine up in

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Martin Diagnostician
Burleson, Texas
Martin
 

Sounds like something is lugging the compressor down when it engages. Maybe over oiled system? Maybe the customer has been adding refrigerant to it? You said this started when the alternator was replaced? Does this car have a one way clutch type alternator pulley? If it goes away with the alternator unplugged, that's where I'd start looking. Hope this helps.

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Luis Technician
Lake Forest, California
Luis
 

Hi Gene have you try to do TP relearn under special functions most oe level scan tools have that option snap on, Autel, after you do the tp relearn you need to go into PGM live data and look for pid that says idle learn it should say completed or not if not completed you need to let it idle for at least 20 min until that live data status shows the idle learn completed

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Rudy Technician
Montebello, California
Rudy
 

If the charge is correct and the pressures are correct,Id call it a bad compressor. I have replaced quite a few for that problem on Honda K series equipped vehicles. Including on my own vehicle.

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Gene Owner
Glendora, California
Gene
   

Hi Guys, Thank you for all the input. I'm not great at posting, my technicians usually do this as they are working on the car. we are at wits end, spent allot of time and parts chasing this, still no luck. to date we have replaced compressor, made sure oil level is correct, I'm sure it's not AC. To recap, at idle, in gear, when AC turns on there is a noticeable 200 to 500 RPM dip, engine

0 Ð Bounty Awarded
Craig Owner
Rowland Heights, California
Craig
 

Gene, Seems like low Alternator output. I am sure your guys checked the voltage drop from alternator to battery. What about running a fused wire from alternator to battery? Be interesting to see what changes when Alternator/fans are unplugged(fuel and/or spark readings).

0 Ð Bounty Awarded
Gene Owner
Glendora, California
Gene
   

Hi guys, It's been a few days since the customer has picked up the car and I am still some what not exactly sure on the cure. We ended up replacing the alternator with a different brand and the concern was gone immediately. The only difference that we could see was the voltage out put on 1st and 2nd alternator was 14.6 volts, the 3rd replacement voltage out put was 13.8. we did test for AC

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