Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On - Car Talk

Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On - Car Talk - Nairaland

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Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 12:21pm On Sep 16, 2019

Guys pls what could be the cause.. This cerato 2008 works perfectly well withou AC. But once u put on the AC it vibrates on idle and I can easily notice its putting serious strain on d engine cause I have to turtle more. I have to stop using AC and consequently I cant use it for taxify which is d main reason why I bought it.. Pls help.. Our ill nigerian mechanics have made me to change fuel pump, spark plug, AC compressor all to no avail...

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by ITbomb(m): 1:39pm On Sep 16, 2019

Snap the RPM on idle without ac, also with ac, let's see

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Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 1:44pm On Sep 16, 2019

ITbomb:
Snap the RPM on idle without ac, also with ac, let's see

rpm on idle without AC is 1100. With AC is about 1000

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Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by AutoMoTech(m): 1:55pm On Sep 16, 2019

bell1255:
rpm on idle without AC is 1100. With AC is about 1000

Without AC your RPM at 1100 is too high. It should be btw 600 and 800 depending on the vehicle sha.
Kindly check your idle system if it has one. Clean your throttle body if its dirty.
Do you have a misfire code? Scan the ECU if you have the CEL on...
Also check the compressor and the belt. Is it the right compressor thats fitted to the engine?

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 1:55pm On Sep 16, 2019

AutoMoTech:
Without AC your RPM at 1100 is too high. It should be btw 600 and 800 depending on the vehicle sha.
Pls kindly provide details of the vehicle in question

Kia cerato 2008. Manual transmission

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by AutoMoTech(m): 1:59pm On Sep 16, 2019

bell1255:
Kia cerato 2008. Manual transmission

Sorry i rechecked and saw U posted it earlier

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by ITbomb(m): 1:59pm On Sep 16, 2019

bell1255:
rpm on idle without AC is 1100. With AC is about 1000

I hope you are using specified plugs and all the plugs are firing

If

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 2:03pm On Sep 16, 2019

ITbomb:
I hope you are using specified plugs and all the plugs are firing

If

The mechanic bought tokunbo plugs... I dont know if d plugs are good ones though. Should I buy new ones. I saw some 2k for four plugs. Are they ok?

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by AutoMoTech(m): 2:04pm On Sep 16, 2019

bell1255:
The mechanic bought tokunbo plugs... I dont know if d plugs are good ones though. Should I buy new ones

You didnt see it or check it yourself? shocked

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Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 2:04pm On Sep 16, 2019

AutoMoTech:
You didnt see it or check it yourself?

How will I know since he said they are tokunbo

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by bell1255(op): 2:11pm On Sep 16, 2019

AutoMoTech:
PLS HELP

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by olumzzz(m): 4:35pm On Sep 16, 2019

bell1255:
The mechanic bought tokunbo plugs... I dont know if d plugs are good ones though. Should I buy new ones. I saw some 2k for four plugs. Are they ok?

Nope they are not.
Buy genuine iridium spark plugs, you can buy from radautoworks or import from amazon.
It's about 3k for only one. That's about 12k in total. Also get genuine coils.
But your engine will breathe a new life.
Also scan to check for error codes.

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Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by CHISPAREPARTS(m): 6:32pm On Sep 16, 2019

We could help with a free scan. Send a PM or contact the number in the signature

Re: Car Vibrates on idle And Reduces Engine Output Significantly When AC Is On by otipoju(m): 11:20am On Sep 17, 2019

bell1255:
The mechanic bought tokunbo plugs... I dont know if d plugs are good ones though. Should I buy new ones. I saw some 2k for four plugs. Are they ok?

Never ever buy Tokunbo plugs or sensitive parts for your car ever again. The world is a global supermarket.

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