Question about 2006 Porsche Cayenne

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No compression on cylinder 3 and air leaking sound

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  • Ricardo Carrau
    Ricardo Carrau Oct 20, 2013

    A compression test its already been done p1 159. P2 159. P3 0 p4 149. P5 159. P6 159. Its working perfectly except cylinder 3 .... The engine wasnt over revv or anithing like it and it dont matter because of the DME wont let it over revv.. One thing is that there is an air leaking sound like it is a manifold air leak sound

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How do you know there is no compression? If you scanned it and you got a cyl3 misfire then remove your coil and make sure your spark plug is tight.

Posted on Oct 20, 2013

  • Ricardo Carrau
    Ricardo Carrau Oct 20, 2013

    Ricardo Carrau A compression test its already been done p1 159. P2 159. P3 0 p4 149. P5 159. P6 159. Its working perfectly except cylinder 3 .... The engine wasnt over revv or anithing like it and it dont matter because of the DME wont let it over revv.. One thing is that there is an air leaking sound like it is a manifold air leak sound Oct 20, 2013

  • mekanik84 Oct 20, 2013

    So perform a leak down test, If you getting air leakage sounding from the intake you may have a bad intake valve, or seat. To have no compression at all and no symptoms prior you will have no choice but to tear down the cylinder head, you may have just dropped the valve. Do a leak down test and see where the air is leaking from.

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Have changed all plugs and coil packs but still giting miss in 1 3 5 cil think its a short in wire hornins but cant find a diagram


If you are getting a misfire code on those three cylinders (all on just that one bank of engine!), it's probably not an electrical short, but something else causing misfire. Misfire codes are set when the power output from that cylinder is less than expected: the pcm senses a crankshaft lag in power output and sets the code.

Typically, misfires are caused by weak or missing spark, or by fuel/air mixture problems, or by low cylinder compression. The fact that your misfires are all on one bank (side) of the engine sounds suspiciously like the fuel/air mixture might be wrong for that bank, or the cylinder compression is low on that bank.

You could use a spark tester just to check spark on 1, 3, & 5. Use a calibrated spark tester to compare both banks-all 6 cylinders. I think you will see equal spark at all cylinders. The only shorts would be in the spark plug wires. And not likely all 3 went bad at once, although you could check them, maybe swap a few around and see if the misfire follows the wire.

Start looking for air or vacuum leaks that only affect bank 1. Possibly an intake manifold leak, could also be an exhaust leak, something that affects the air/fuel mixture in the bank 1 cylinders. Also you could do a compression test of the cylinders to make sure bank 1 is good, same compression as in bank 2 (the other side of engine). Just some tips to help you out, good luck.

Feb 20, 2016 | Cars & Trucks

4 Answers

Holden viva 2005 wagon auto electrician said there is no compression in number 4 cylinder and not much in number 1 and maybe the valve could have been damaged? Advice appreciated please.


The valves allow air and gasoline to enter the combustion chamber, to be ignited by the spark plug, and to allow the burned gases to be exhausted from the chamber.

When the valves do not work, a mechanic needs to remove parts of the engine, to see what's wrong, and to make repairs.
It could cost you $500 to $1000 US dollars.

Maybe, time to "junk" the TEN-YEAR-OLD vehicle, and buy another one ???

Apr 20, 2015 | Holden Cars & Trucks

2 Answers

P0303 cylinder 3 misfire


which engine? ; again, and WHAT ENGINE ???????
your fixing and engine and don't know what's there? really?
303 means misfire.
but more accurately it means weak combustion
and can be cause by 3 things. or more.
1: bad spark , be it the plug or wires, or coil
2: low compression, lots of ways. 10 or more, ask.
3: bad air fuel ratio to that cylinder 3, air leaks?

the ECU discovers this with the spark monitor
this monitor (runs all the time) it sees, the crank shaft
not accelerate fast enough, (weak power stroke on #3)
that is all you need to know on P030x codes.

if spark is prefect
and AFR good.
then it must be compression, right?
even water leaks to the combustion chamber can do this.
it is misfiring, that you can bank on.
no engine posted, why do that?

all we know here, is a body. a 05 GC.
3.7L
or
4.7L?
or?
5.7L ?????

ill quote the fsm
for you.
i toss coin, lands on 3.7

the FSM listed items for 303, some are IFFY (comments)

  • INTERMITTENT MISFIRE #3 only. !!!
  • VISUAL INSPECTION (of spark and injector parts)
  • (F142), (K334) ASD RELAY OUPUT CIRCUIT (i disagree)
  • ENGINE MECHANICAL PROBLEM (50 causes)
  • IGNITION COIL
  • COIL CONTROL CIRCUIT
  • SPARK PLUG
  • CHECKING FUEL PRESSURE (why only 1 cylinder?)
  • FUEL PUMP INLET STRAINER PLUGGED (ditto)
  • RESTRICTED FUEL SUPPLY LINE (ditto)
  • FUEL PUMP MODULE (ditto)
  • CHECKING FUEL LEAK DOWN (injectors leaks)
  • FUEL INJECTOR (injectors sticks)
  • INJECTOR CONTROL CIRCUIT (shorts or opens in the line)
  • PCM (last , if ever. i bet not it)

Basics is better.
1: SPARK BAD.
2: FUELING BAD. (LOTS OF WAYS , FUELing OR AIR LEAKS)
3: BAD COMPRESSION, or even water leaks or cam lobe damage
or valves in head bad. ,

does your engine use COPS? coil over plugs????
why not say what engine.

did you replace the spark plugs and use the correct type
and gap them per the hood EPA sticker (look up)
and if it has COPS, did you at lease make sure the COP boot
on #3 is brand new? if not why not?
using the old boots on #3 is wrong, idea. they all fail. soon.
the 3.7 has COPS
put new boot on it. (buy them, if possible. (i carry spares at all times)
then look in the wells. are the wells full of oil or water. BINGO.
did you even look there?

the one hard part of misfire is , is the AFR, air fuel mix ok on #3
and compression, W.O.T. the tool is like $20 and 15min work.

Sep 04, 2014 | 2005 Jeep Grand Cherokee

2 Answers

What is compression leak


Compression is what happens when the piston comes up and compresses the fuel/air mixture. Then the spark plug ignites it and the explosion drives the piston down in turn, turning the Crankshaft in turn making the car go. A compression leak is when this compressed fuel/air mixture is escaping from the combustion chamber.. This can happen 3 ways. 1. Bad piston rings, 2. Blown head gasket or cracked head or block, (usually caused by overheating), Or the least costly.. loose spark plugs.

May 16, 2014 | 1999 Cadillac DeVille

1 Answer

My car lags to accelerate and shakes


Check for spark at each cylinder. Is it missing? Or is it a transmission problem? Is engine response fine in park?

If you have a misfire, troubleshoot with this in mind: for combustion to occur, the cylinder needs air, gas, spark, and compression. Misfires occur because one of them is missing or not correct. As in say, the fuel/air mixture could be incorrect, or the compression could be too low for that cylinder to produce power. So you check the easiest first- 1. check all cylinders for spark. 2. Then check that gas is being injected into the cylinders. 3. Then check for vacuum leaks from vacuum hoses and the intake manifold gasket and the throttle body gasket. The fuel is metered in by how much air the computer knows is going past the mass air flow sensor or the MAP sensor. If extra air gets sucked in through a leak, the mixture can be leaned out way too much. 4. If you have gas and spark, and still misfiring, you may have a mechanical problem-now you need to check compression in the cylinders.

If you have a transmission problem, it could be the torque converter clutch not releasing. Transmission problems are very vexing, worse than a curse.

Dec 18, 2013 | 2000 Honda Accord

1 Answer

Can I repair a bad cylinder without taking apart the motor in a 2000 Monte Carlo?


Are you talking about compression readings? If so, and you only have 30 psi, engine is in serious state of disrepair. The cylinder head will have to be taken off to fix the problem-sounds like a stuck valve, a non sealing valve, or a blown head gasket. There's no way to get to it without removing the head.
Apparently you had a compression test done? If you had done or would do a leak down test of that cylinder, it would pinpoint the source of the problem-whether an intake or exhaust valve, or a head gasket, or piston or ring damage. With a leak down test, wherever the air is escaping from the cylinder points to the source: if for instance, air leaks out the exhaust pipe, you know it is the exhaust valve not sealing in that cylinder. If air leaks out the intake-it's the intake valve.
Air hissing from the oil dipstick tube would mean compression is being lost past the piston rings-going into the crankcase.

Feb 22, 2013 | 2004 Chevrolet Monte Carlo

1 Answer

Timing chain broke and bent valves in my 202 pontiac grand am, all has been replaced and now cylinder #3 has no compression


Put #3 cylinder in firing position then put air pressure in that cylinder and remove the oil cap. If air comes out throttle body the intake valve is leaking. If air comes out the tail pipe the exhaust valve is leaking. If air comes out where the oil cap came off the piston is leaking.

Jul 28, 2011 | Pontiac Grand Am Cars & Trucks

4 Answers

My engine light came on. I went to Autozone to get a reading. It read PO301 3rd cynlinder misfire. So I put new plugs and wires. The engine light never went off. I re check the plugs and wires. But I kept...


Low compression can be caused by different things. And NO YOU DON'T need a new engine yet. You need to take the car to a repair shop that you trust and have them do more tests. A bad Valve will cause low compression and thats a lot cheaper than a whole new engine. A bad head gasket can cause low compression and that's cheaper than a new engine. You need to have the repair shop do what's called a "leak down" test. This is where the cylinders are pressurized one at a time and if they are losing pressure, the mechanic can pretty much tell you the problem. For example if air is coming out the exhaust, then the exhaust valve has failed, and if air is coming out of the intake, the the intake valve has failed. If it bubbles out of the radiator then the head gasket has most likely failed. Take it in and let me know..

Jan 15, 2011 | 2006 Dodge Stratus

1 Answer

Giving a 300 and a 301 code where do i start sounds fine when started and then when you put in gear it start misfiring


P0300 - Random / Multiple Cylinder Misfire Detected

Possible Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plugs
- Replaced Injectors
- Replaced Ignition Coils

P0301- Cylinder Number 1 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.

Jan 14, 2011 | 2002 Toyota Tacoma

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