broken timing belt or something else?
07-30-2010, 01:45 AM
#1
AudiWorld Member
Thread Starter
broken timing belt or something else?
So I just bought a 2001 A6 2.7t MT for 1800$ and it supposedly has a broken timing belt. However, no-one ever took anything apart to look. The engine compartment is untouched and the story is that the previous owner "heard the timing belt break" and that all it would do is click when you turned the key. Supposedly when it "broke" he had it towed to a dealership (not an Audi one either I don't believe) and traded it in. Initially when I heard this, I thought, OMG I might have just gotten a totally sweet deal as I paid less than 2k for this car with only 118k and its in great shape!
Well, I got the car home last night and the battery was dead so I charged it all night. I also pulled the following codes last night after a partial charge.
The only thing that made me think perhaps it actually is the timing belt is the two camshaft pos sensor faults.
I cleared those and then let it charge the night. I got up and like a little kid at xmas, I couldn't wait till I got home from work so at 5am I turned the key and the engine turns over. No clicking. No banging. I checked the codes again and again I got the two cam pos errors.
It didn't seem to catch, but I didn't have time to check other things like fuel, ect ect. So while I have all day to think about it, I figured I would post my results and see what the consensus is. If you had a broken timing belt, what codes would you normally expect to pull when turning the motor over?
When I get home tonight I will check plugs, wires, look for unplugged stuff and check compression which should tell me for certain.
Well, I got the car home last night and the battery was dead so I charged it all night. I also pulled the following codes last night after a partial charge.
Code:
Chassis Type: 4B - Audi A6 C5 Scan: 01,02,03,08,15,16,17,35,36,37,45,55,56 Address 01 ------------------------------------------------------- Controller: 4B0 907 551 AA Component: 2.7l V6/5VT G 0001 Coding: 06712 Shop #: WSC 02325 WAUED64BX1N073385 AUZ7Z0Y1627114 9 Faults Found: 17866 - Exhaust Gas Temp Sensor 2 (G236): Short to Ground P1458 - 35-10 - - - Intermittent 17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus P1453 - 35-10 - - - Intermittent 16502 - Engine Coolant Temp. Sensor (G62): Signal too High P0118 - 35-10 - - - Intermittent 17870 - Exhaust Gas Temp Regulation for Bank 2: Implausible Signal P1462 - 35-10 - - - Intermittent 16826 - EVAP Emission Control Sys: Small Leak P0442 - 35-10 - - - Intermittent 17869 - Exhaust Gas Temp Regulation for Bank 1: Implausible Signal P1461 - 35-10 - - - Intermittent 16730 - Camshaft Position Sensor (G163): Implausible Signal P0346 - 35-10 - - - Intermittent 16725 - Camshaft Position Sensor (G40): Implausible Signal P0341 - 35-10 - - - Intermittent 18010 - Power Supply Terminal 30: Voltage too Low P1602 - 35-10 - - - Intermittent Readiness: 0000 0000
I cleared those and then let it charge the night. I got up and like a little kid at xmas, I couldn't wait till I got home from work so at 5am I turned the key and the engine turns over. No clicking. No banging. I checked the codes again and again I got the two cam pos errors.
Code:
Control Module Part Number: 4B0 907 551 AA
Component and/or Version: 2.7l V6/5VT G 0001
Software Coding: 06712
Work Shop Code: WSC 02325
Additional Info: WAUED64BX1N073385 AUZ7Z0Y1627114
2 Faults Found:
17800 - Camshaft Position Sensor Bank 2 (G163): Open Short to Plus
P1392 - 35-00 - -
17746 - Camshaft Position Sensor (G40) Open or Short to Plus
P1338 - 35-00 - -
When I get home tonight I will check plugs, wires, look for unplugged stuff and check compression which should tell me for certain.
07-30-2010, 03:11 AM
#2
AudiWorld Member
Join Date: May 2003
Location: Norwalk, CT
Posts: 185
Likes: 0
Received 0 Likes
on
0 Posts
Seems to me that the easiest way to check for a broken timing belt would be to pull off one of the timing belt covers and look to see if the thing is in one piece as a starting point vs. pulling codes.
07-30-2010, 04:40 AM
#3
AudiWorld Senior Member
Camshaft sensors will prevent the car from starting if they are disconnected. All those other codes are intermittent - a bunch of crap has been unplugged and the ignition cycled, which stored them.
Look at the camshaft hall sensors, source some other sensors and swap them to see if they are bad, and then start getting into wiring.
Look at the camshaft hall sensors, source some other sensors and swap them to see if they are bad, and then start getting into wiring.
07-30-2010, 04:43 AM
#4
AudiWorld Member
Thread Starter
Camshaft sensors will prevent the car from starting if they are disconnected. All those other codes are intermittent - a bunch of crap has been unplugged and the ignition cycled, which stored them.
Look at the camshaft hall sensors, source some other sensors and swap them to see if they are bad, and then start getting into wiring.
Look at the camshaft hall sensors, source some other sensors and swap them to see if they are bad, and then start getting into wiring.
I am just speculating right now because I am at work and so I have multiple hours to wait to get home before taking covers off and looking at things physically and I'm impatient heh
.
07-30-2010, 05:00 AM
#5
AudiWorld Senior Member
If you turned it over a whole lot and you didn't get "camshaft sensor implausible signal" or something, thats a good sign. If you didn't get any noise, that's a good sign. I'd certainly pull the covers and even the core support off and inspect the hell out of everything before I drive it, but as for guessing it's good, the best I can do is hope. If you pull the covers off and set the crank pulley to TDC (very easy with just a wrench), you can tell very quickly if the timing is right.
07-30-2010, 05:12 AM
#6
AudiWorld Member
Thread Starter
If you turned it over a whole lot and you didn't get "camshaft sensor implausible signal" or something, thats a good sign. If you didn't get any noise, that's a good sign. I'd certainly pull the covers and even the core support off and inspect the hell out of everything before I drive it, but as for guessing it's good, the best I can do is hope. If you pull the covers off and set the crank pulley to TDC (very easy with just a wrench), you can tell very quickly if the timing is right.
I shall post this afternoon once I know more. I should post some pics of my find as well.
07-30-2010, 06:18 AM
#7
AudiWorld Super User
O come on! It takes about 15 seconds to determine a broken timing belt...take off the engine covers and pop two of the three clips on the pax side cam gear cover (plastic, don't pop the bottom one, two difficult anyway), flex the cam gear cover to the front, and LOOK at the belt! If it's tight, it ain't broken!!
But too late...you've already spun the engine over...I guarantee if you spin an interference engine over with a broken timing belt you will bend valves!
So, my take on it is that you don't have a broken timing belt.
But too late...you've already spun the engine over...I guarantee if you spin an interference engine over with a broken timing belt you will bend valves!
So, my take on it is that you don't have a broken timing belt.
Trending Topics
07-30-2010, 07:13 AM
#8
AudiWorld Member
Thread Starter
O come on! It takes about 15 seconds to determine a broken timing belt...take off the engine covers and pop two of the three clips on the pax side cam gear cover (plastic, don't pop the bottom one, two difficult anyway), flex the cam gear cover to the front, and LOOK at the belt! If it's tight, it ain't broken!!
But too late...you've already spun the engine over...I guarantee if you spin an interference engine over with a broken timing belt you will bend valves!
So, my take on it is that you don't have a broken timing belt.
But too late...you've already spun the engine over...I guarantee if you spin an interference engine over with a broken timing belt you will bend valves!
So, my take on it is that you don't have a broken timing belt.
I'll have the covers off and checking the belt about 5 minutes after I get home this afternoon. Then I will either be extremely pleased at not having to spend significant $$$ to get this thing running or I'll be figuring out how much I will be spending and still be happy I got the car.
07-31-2010, 04:51 PM
#10
AudiWorld Member
Thread Starter
So its definately a bad timing belt belt. Its not broken, but the teeth are stripped off the belt and neither camshaft will smoothly rotate by hand with the motor in TDC.
So I am pulling the motor and will evaluate the condition of the heads once its out.
So I am pulling the motor and will evaluate the condition of the heads once its out.