Cylinders Mis-Firing

Choleric · 11-08-2007, 11:21 AM

I vag-commed my A4 1.8T because of a reoccuring check engine light. It said I have cylindars misfiring.

What is the best solution? I am most likely going to take it to my local mechanic who works on European cars. But is there anything I could possibly do before or instead of this. What's the cost looking to be on this thing?

The worst part of all this is that has been getting very cold lately and my car struggles to start and wont start at all in the early morning.

Plus I just had a full service done last year, and now its acting up again, I am ready to sell this thing and buy a newcar.

Centurion · 11-08-2007, 11:32 AM

A big possiblity is that a vent needs to be adjusted. That was the case with my moms car a while ago and we took it to a mechanic who got the job done wihtin four hours without changing any parts. Shouldn't cost you more than 100 dollars.
Issues with the engine are a nightmare, especially because it gives mechanics an opportunity to gauge you bank account.

Don't forget to check the plugs.

monster · 11-08-2007, 06:09 PM

Could be a faulty fuel injector putting too much or too little fuel into the combustion chamber.

martinbo · 11-09-2007, 04:52 AM

In my experience with three misfiring 20V 1.8T engines is that your problem is more than likely one or more coils (your car has four of them) that are on the way out. Replace all four coils and you'll be sorted.

Choleric · 11-24-2007, 10:04 PM

Thanks for the input guys. I got back from the shop last week just before I drove 1000 miles to and from Colorado.

Turns out there was a large hole in the intake causing a huge vacuum resulting in the cylinders misfiring. They also replaced the coolant censor sense that was faulty.

Everything seems to be running fine now, started cold no problem at 9°F. Though, they did say Martin, that I may need to replace my coils, if that didn't help.

They also suggested a Timing Belt change, especially with my car approaching 100K miles. Which I have read about being a problem.

Gullwing · 11-24-2007, 10:21 PM

Timing belt should be replaced soon. The timing belt idler pulley on my 2.8 exploded a few years ago. I was very lucky the belt did not jump any teeth on the camshaft pulleys or major engine damage would have happend.
Or you could upgrade to a Mercedes, see they realize metal chains last much longer then crappy belts on critical engine parts

11-08-2007, 11:21 AM	#1
Choleric Moderator Join Date: Oct 2005 Location: Aksarben Posts: 3,201 Thanks: 613 Thanked 1,131 Times in 613 Posts	Cylinders Mis-Firing I vag-commed my A4 1.8T because of a reoccuring check engine light. It said I have cylindars misfiring. What is the best solution? I am most likely going to take it to my local mechanic who works on European cars. But is there anything I could possibly do before or instead of this. What's the cost looking to be on this thing? The worst part of all this is that has been getting very cold lately and my car struggles to start and wont start at all in the early morning. Plus I just had a full service done last year, and now its acting up again, I am ready to sell this thing and buy a newcar.

11-08-2007, 11:32 AM	#2
Centurion Jetsetter Join Date: Sep 2005 Location: Sweden Posts: 9,202 Thanks: 1,037 Thanked 1,507 Times in 805 Posts	Re: Cylindars Mis-firing A big possiblity is that a vent needs to be adjusted. That was the case with my moms car a while ago and we took it to a mechanic who got the job done wihtin four hours without changing any parts. Shouldn't cost you more than 100 dollars. Issues with the engine are a nightmare, especially because it gives mechanics an opportunity to gauge you bank account. Don't forget to check the plugs.

11-08-2007, 06:09 PM	#3
monster Fanatic Join Date: Oct 2005 Location: Sydney Posts: 2,083 Thanks: 808 Thanked 927 Times in 485 Posts	Re: Cylindars Mis-firing Could be a faulty fuel injector putting too much or too little fuel into the combustion chamber.

11-09-2007, 04:52 AM	#4
martinbo Fanatic Moderator Emeritus Join Date: Sep 2005 Location: Johannesburg Posts: 1,701 Thanks: 324 Thanked 531 Times in 269 Posts	Re: Cylindars Mis-firing In my experience with three misfiring 20V 1.8T engines is that your problem is more than likely one or more coils (your car has four of them) that are on the way out. Replace all four coils and you'll be sorted.

11-24-2007, 10:04 PM	#5
Choleric Moderator Join Date: Oct 2005 Location: Aksarben Posts: 3,201 Thanks: 613 Thanked 1,131 Times in 613 Posts	Re: Cylindars Mis-firing Thanks for the input guys. I got back from the shop last week just before I drove 1000 miles to and from Colorado. Turns out there was a large hole in the intake causing a huge vacuum resulting in the cylinders misfiring. They also replaced the coolant censor sense that was faulty. Everything seems to be running fine now, started cold no problem at 9°F. Though, they did say Martin, that I may need to replace my coils, if that didn't help. They also suggested a Timing Belt change, especially with my car approaching 100K miles. Which I have read about being a problem.

11-24-2007, 10:21 PM	#6
Gullwing Enthusiast Join Date: Dec 2005 Location: Las Vegas Posts: 217 Thanks: 7 Thanked 45 Times in 31 Posts	Re: Cylinders Mis-Firing Timing belt should be replaced soon. The timing belt idler pulley on my 2.8 exploded a few years ago. I was very lucky the belt did not jump any teeth on the camshaft pulleys or major engine damage would have happend. Or you could upgrade to a Mercedes, see they realize metal chains last much longer then crappy belts on critical engine parts

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