Engine is shaking and really loud

Tee · 04-18-2023, 01:00 AM

Hey all,

I was driving and stopped on a traffic light, suddenly my check engine light came on, rpm dipped, and the car started shaking and was really loud (sounds like a cammed V8)

The check engine light went away but the car is still really loud, rpm constantly dips, shakes heavily especially at idle.

I replaced the cat and installed a HFC and a mechanic checked for any vacuum leaks, checked MAF sensors, throttle bodies, etc.

Spark plugs were recently replaced (however one seems darker than the rest). The mechanic suspects it could be the ignition coils, but there are no codes whatsoever when we scanned the ECU.

Could it be the ignition coils or fuel injectors even though there are no codes? If not, what could it be?

ZoomZ · 04-18-2023, 01:56 AM

Check electrical plugs to coils. Make sure they are snug and someone didnt break the lock tab.

vtec to vvel · 04-18-2023, 09:58 AM

Get a OBD II to see if there are any codes and go from there.

ZoomZ · 04-18-2023, 11:53 AM

Quote:

Originally Posted by vtec to vvel

Get a OBD II to see if there are any codes and go from there.

He already did I think.

"The mechanic suspects it could be the ignition coils, but there are no codes whatsoever when we scanned the ECU."

vtec to vvel · 04-18-2023, 12:12 PM

Quote:

Originally Posted by ZoomZ

He already did I think.

"The mechanic suspects it could be the ignition coils, but there are no codes whatsoever when we scanned the ECU."

I stand corrected

Richie370Z · 04-10-2024, 02:09 PM

Hello Tee, did you ever find out what the issue was? I ask because this same exact thing just happened to me. No Codes and all the same symptoms.

Thank you in advance..

Averying · 04-10-2024, 02:54 PM

Quote:

Originally Posted by Richie370Z

Hello Tee, did you ever find out what the issue was? I ask because this same exact thing just happened to me. No Codes and all the same symptoms.

Thank you in advance..

How long has the issue been happening? Ive noticed that sometimes the check engine light doesn’t appear until the car has been driven for a few miles and/or the car has been turned on/off a few times with the issue persisting.

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04-18-2023, 01:00 AM	#1 (permalink)
Tee Base Member Join Date: Jan 2022 Location: Dubai Posts: 1 Drives: 2014 370Z Rep Power: 3	Engine is shaking and really loud Hey all, I was driving and stopped on a traffic light, suddenly my check engine light came on, rpm dipped, and the car started shaking and was really loud (sounds like a cammed V8) The check engine light went away but the car is still really loud, rpm constantly dips, shakes heavily especially at idle. I replaced the cat and installed a HFC and a mechanic checked for any vacuum leaks, checked MAF sensors, throttle bodies, etc. Spark plugs were recently replaced (however one seems darker than the rest). The mechanic suspects it could be the ignition coils, but there are no codes whatsoever when we scanned the ECU. Could it be the ignition coils or fuel injectors even though there are no codes? If not, what could it be?

04-18-2023, 01:56 AM	#2 (permalink)
ZoomZ Track Member Join Date: Jan 2017 Location: Vancouver, BC Posts: 760 Drives: 17' 370Z Nismo Rep Power: 40617	Check electrical plugs to coils. Make sure they are snug and someone didnt break the lock tab. Tee likes this.

04-18-2023, 09:58 AM	#3 (permalink)
vtec to vvel A True Z Fanatic Join Date: Feb 2015 Location: 813 Posts: 3,915 Drives: 13 Z Rep Power: 502909	Get a OBD II to see if there are any codes and go from there. ZoomZ likes this. __________________ Don't like what I post? Too bad. I really don't give a sh!t

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Richie370Z Base Member Join Date: Nov 2014 Location: Fort Lauderdal Posts: 6 Drives: 15 Nissan 370Z MB A7 Rep Power: 11	Hello Tee, did you ever find out what the issue was? I ask because this same exact thing just happened to me. No Codes and all the same symptoms. Thank you in advance..