Friday, March 29th, 2019 AT 1:29 PM
HASSAN SHUAIBU
- MEMBER
- 1995 PEUGEOT 406
- 2.0L
- 327,999 MILES
My engine rpm drops to 550 when on AC.
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3 Replies
JOETECHPRO
- MECHANIC
- 705 POSTS
Hey HASSAN SHUAIBU,
Does the same thing happen when you turn electrical loads on?
Does the A/C work?
Turn on all electric items eg. headlights, rear window defogger, wipers.
If this load does not affect the idle then you may have an issue with the the A/C compressor.
How is the idle generally?
Stable and smooth?
A good place to start would be to clean the throttle body on your vehicle. Guide below:
https://www.2carpros.com/articles/throttle-actuator-service
Also check for vacuum leaks:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
I do not have the specifics for your vehicle but i would also advise checking your idle control valve and cleaning if necessary.
You may be able to find a guide for this online.
If you post some pictures we should be able to identify the items you need to remove/clean.
Regards, Joe
Does the same thing happen when you turn electrical loads on?
Does the A/C work?
Turn on all electric items eg. headlights, rear window defogger, wipers.
If this load does not affect the idle then you may have an issue with the the A/C compressor.
How is the idle generally?
Stable and smooth?
A good place to start would be to clean the throttle body on your vehicle. Guide below:
https://www.2carpros.com/articles/throttle-actuator-service
Also check for vacuum leaks:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
I do not have the specifics for your vehicle but i would also advise checking your idle control valve and cleaning if necessary.
You may be able to find a guide for this online.
If you post some pictures we should be able to identify the items you need to remove/clean.
Regards, Joe
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Friday, March 29th, 2019 AT 5:39 PM
HASSAN SHUAIBU
- MEMBER
- 40 POSTS
Yes sir, the AC works fine and it's only the AC that cause the drop in rpm. I assume when AC is switched on the rpm suppose to increase to compensate for the load increase. Though I usually see check engine like when at idle but the moment I start to accelerate the light will disappear. Also when I depress the throttle at idle the light disappears.
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Friday, March 29th, 2019 AT 10:05 PM
JOETECHPRO
- MECHANIC
- 705 POSTS
Hey HASSAN SHUAIBU,
If you can follow the guide below and scan for codes that will be helpful in getting this fixed:
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
It sounds like your idle control is not working.
The guides from before for cleaning throttle and checking for vacuum leaks may find the problem but it will be quicker if you get the codes.
Hope that helps.
Regards, Joe
If you can follow the guide below and scan for codes that will be helpful in getting this fixed:
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
It sounds like your idle control is not working.
The guides from before for cleaning throttle and checking for vacuum leaks may find the problem but it will be quicker if you get the codes.
Hope that helps.
Regards, Joe
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+1
Friday, March 29th, 2019 AT 10:53 PM
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