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Audi TT multiple misfire HELP pleaSE :)


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ligroy
Novice

Mar 5, 2018, 10:53 AM

Post #1 of 13 (517 views)
Audi TT multiple misfire HELP pleaSE :) Sign In

hey all, i have a 2002 Audi TT
so the issue was, my car was running sluggish, so taking out the manifold and getting to all the vacuum hoses, i find out my PCV valve was broke, was breathing air both ways,so.i replaced breather hose, PCV valve and few other vacuum hoses that were old, i also took out manifold and cleaned it out, changed oil as well and last thing i did was change fuel filter, i turn my car on and wow sounds like a new car, all issues were gone,,,i drive it down the street about 2 miles, on my way back home car was misfiring and once again running sluggish, i BOD's and saw a miss fire on cylinder 3, thinking it could be a coil pack, i swap coil packs with cylinder 1 and the car now spat out 3 miss fires and the car was struggling to start,,,i swapped out all the coil packs once again and now the car wont start at all, stars and shuts really quick and vibrates.....could this be a bad fule filter? i also dont have too much gas in the engine as i have been doing all this work,,so could it have something to do with fuel not reaching the new fuel filter because of low gas ? im scratching my head,,please any help wold be amazing

i should add, the car does start but turns off quickly and engine shakes and does not make a good sound, seems to me no fuel is going in?

ive posted this on Audi forums but to be honest no one really helps or knows enough to help, so here i am, hopefully some of you more knowledgeable people can help me,,,thanks so much


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 5, 2018, 12:56 PM

Post #2 of 13 (503 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

Using a fuel pressure gauge is the only way you are going to find out if you have a fuel issue. A filter being the sole cause is not likely at all.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ligroy
Novice

Mar 5, 2018, 5:05 PM

Post #3 of 13 (482 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

so itwas not the fuel, but here is an error im getting



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 5, 2018, 5:09 PM

Post #4 of 13 (474 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

Those are not errors. Get a real scan tool and get code numbers.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ligroy
Novice

Mar 5, 2018, 5:34 PM

Post #5 of 13 (464 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

well i did get errors using my wifi OBD, errors were P0300 P0303 P0304 which are misfire, so few people told me it could be i need to put in new manifold gasket as every time you remove it you will get a leak,,so that might be my next step and throttle body gasket..but any help is appreciated


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 5, 2018, 5:42 PM

Post #6 of 13 (460 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

I highly doubt that gasket is you problem. You would be getting lean codes long before misfire codes.

You need to go back to basics testing spark, compression and fuel pressure.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ligroy
Novice

Mar 5, 2018, 9:35 PM

Post #7 of 13 (445 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

spark plugs are brand new, and yes compression testing will be done this week, im just trying to get more expert opinion so i can perhaps hash this out myself..
thanks for all the help


ligroy
Novice

Mar 6, 2018, 3:29 PM

Post #8 of 13 (420 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

quick update,,did a compression test and failed on all cylinders, battery voltage is now at 11.5 im guessing because of the misfires? so this could be the manifold gasket or throttle body gasket? what do you guys think?


ligroy
Novice

Mar 6, 2018, 4:24 PM

Post #9 of 13 (414 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

compression test on the first two cyl's video

https://www.youtube.com/watch?v=7g_gAEgI_rU


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 6, 2018, 7:00 PM

Post #10 of 13 (406 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

You're dreaming. You have no compression. That translate to major internal engine problems. You may have broken a timing belt/chain and that would have bent a whole bunch of valves. It's time you brought this to a professional shop for diagnosis.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Mar 7, 2018, 5:25 AM

Post #11 of 13 (390 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

It sounds like it has compression in the first cylinder, but there's something wrong with your compression gauge. Check to be sure that there is a Schrader valve installed n the hose end and that the Schrader valve is good.

Also when you do a compression check your battery has to be fully charged. Your battery sounds like it's dying.

Also make sure that your injectors are disabled. You don't want fuel going into the cylinders while you're checking compression. Don't be to hasty to condemn the engine if it has no compression in a cylinder. Sometimes the rings can get washed out from cranking on it while fuel is being injected. Put a couple teaspoons of oil down into the cylinders that have no compression and crank the engine a couple of times and recheck.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Mar 7, 2018, 7:14 AM)


ligroy
Novice

Mar 7, 2018, 6:23 PM

Post #12 of 13 (364 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

thanks for the reply,yes you are right my battery was dead i checked, took it in the shop to get it charged and they said its dead,,compression tool is brand new, and yes i removed fuel pump fuse before i did the compression test..my question would be now that i know the battery was dead, does a battery need to be fully charged for the compression test to show any results at all?
also could my battery have died because of these misfires and all the testing ive been doing?
ill put some oil in the cylinders and do the compression test again on a full battery..
its easy for me to take the car in a shop and get her fixed, which i might end up doing, but to be honest im learning so much and have learned so much about cars in general that i find this to be a a learning process for me and i sort of enjoy it, thanks to you guys and your help Smile


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 8, 2018, 2:32 AM

Post #13 of 13 (347 views)
Re: Audi TT multiple misfire HELP pleaSE :) Sign In

? Your Shrader valve on compression tester is nothing like any I have? Battery should crank engine at normal crank speed that's all the matters. If you did for a while the 11.5V you saw was fine alone it's what it might read while cranking that matters just for that.


Compression gauge should be done with all plugs OUT, crank engine defeating any ignition or fuel delivery and count at it goes up the 4th stroke counts but should hold that on the gauge until you let that pressure out - it didn't so was just a failed test IMO.


Even a lousy running engine if alternator was spinning fast enough even 600 RPM it should charge or show ABOUT 13.5V to high 14.? but not over 15V with a working but weak battery.


If it can't do that and is trying to run out of any normal range so are all the thing that make it run.


In essence you could do a compression test without a battery at all if you could just turn the engine some other way not done by anyone.


Best if engine is warm and do it again with a squirt of oil especially if low it will go up how much matters for what it all means. Learn the gauge you have and what compression testing mean and how it's done for the tools you have. I can't know how you did it but it wasn't good looking nor a valid test IMO so start over and do it right,


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