Question about 1993 Mercedes-Benz S-Class

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Compression leak in #3 injector

Need to know the part# or name of the part that goes between the tread ring/precombustion chamber and the injector,it appears to be made of black plastic or nylon and may seat into the thread ring that holds down the precombustion chamber

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Seem it"s seal ring,ty

Posted on Apr 18, 2009

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1 Answer

Chambers 3 & 4 are not firing

wet indicates excessive fuel
check the injectors and seals
run the fault codes
do a compression test to check gasket between 3&4

Nov 15, 2015 | Cars & Trucks

1 Answer

I have a Daewoo lanos 1500 98 and firing very weak on 3. ive changed distributer, leads, plugs, what can I look for next?

You may have a failed or clogged fuel injector (if it uses multi-port injection) or that particular cylinder may have low compression because of a burned valve or bad piston rings. Have both the injectors and the compression tested and be sure a full leak-down compression test is performed.

Nov 02, 2014 | 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.
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)

  • VISUAL INSPECTION (of spark and injector parts)
  • (F142), (K334) ASD RELAY OUPUT CIRCUIT (i disagree)
  • CHECKING FUEL PRESSURE (why only 1 cylinder?)
  • 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.
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

Changed injector o ring and now it wont turn over like it vapor locked

A vapour lock will not stop and engine from turning over but a hydraulic lock will . The difference is vapour compresses , fuel doesn't. Remove the spark plugs and wind the engine over to clear fuel that has leaked into the combustion chambers .

Apr 06, 2014 | 1995 Chevrolet Corsica

2 Answers

Truck shakes when started, smokes blue, lots of blow by

Blue smoke on starting is a sign of oil in the engine cylinders. .
Excessive fuel would be black smoke on starting. I am concerned that it happens when starting. This is an indication of a valve issue. Bent, broken, bad spring, wallowed guides. This repair is not going to be cheap. Only way to know for sure is either a compression test or leak down test.

Mar 19, 2017 | Cars & Trucks

1 Answer

Leaking and burning engine oil. Black smoke coming from exhaust

Hello Chelsea

There are only three places you can lose oil.

From the valve stems. This burns oil and it will be present in the exhaust. It is the least expensive to fix as only the cylinder head has to come off.

From the piston rings and especially the oil scraper ring, (two compression rings and one oil scraper ring). This requires engine removal, a rebore, new pistons and rings. This also causes oil to be burned in the combustion chamber.

Oil leaks from joints in the external seals to the engine, the sump for example. Also from the oil breather pipe. You can check this by sliding a piece of carboard after you park and check it before you drive next time. Any POOLS of oil signify a leak.

By you saying your oil is black, signifies oil is seeping into the combustion chamber and being partially scraped back.

Check the compression with a tester, and measure against what compression is supposed to be. You can Google this.

Aug 14, 2017 | 1999 Toyota Corolla

1 Answer

Cyllander5 misfire codep0305

you need to include what kind of car, year, engine, mileage-generally though, one of three things cause this-a misfire due to ignition (bad plug, plug wire) a leaking or bad injector (but i do not know if you have a car with fuel injectors since you don't mention what kind of car/year you have)-the only other thing could be compression (burnt/leaking valve, cracked or brolen piston rings). install a new plug there, while you have it out, check compression by inserting a compression gauge hose in the open cylinder and have someone crank the engine AFTER you have removed the ignition coil (if you have one) or removed the ignition fuse or plug wires. Check/replace the plug wires (if compression is good) and check to see if the injector for that cylinder is 'clicking' (hold a broom handle against the injector while the engine idles, the other end to your ear). No clicky, a bad injector.

Oct 10, 2011 | Cars & Trucks

1 Answer

Missfire cyl.3-4 on 3.5lt.

there are only 4 things that will cause this, in order of probability-a leak in the seal around the spark plug, filling the chamber with oil, causing either the coil in that cylinder to short, or if it is dry, the coil itself is bad. Check the boot that goes around the plug for leaks. an injector that is not pulsing (you should be able to hear it if you place a long handled screwdriver against it and your ear to the other end, it should click) will cause a miss, and bad compression in that cylinder, which is the least likely and most expensive to repair.

Jul 26, 2011 | 2000 Oldsmobile Intrigue

1 Answer

Ce lights on code reads #3 cylinder misfire

I assume this 'complete' tune up was plugs, wires and plennum (intake surge tank) gasket?
If so, recommend you first check to see if you are getting an injector pulse to the #3 injector (a noid light is normally used to verify the injector is receiving the 'pulse' from the ECM. The noid light is a very useful tool in finding out if you have problems with your fuel injector. It is cheap (around 10 dollars per piece), easy to use (if the light blinks, your injector is receiving the electrical pulse to open). If after you verify the injector pulse is present, the next step is to determine if the injector or cylinder is the problem. A simple verification process requires swapping the #3 injector with another to see if the misfire moves to the swapped cylinder.(.i.e, move #3 injector to #2 cylinder & the #2 injector to #3 cylinder.).. Then run engine to see if the P0303 changes to P0302. This would VERIFY the injector is in some way defective. If the misfire STAYS at #3 cylinder, you'll want to perform a compression test of all the cylinders. If after this test you find #3 cylinder is more than 10% lower than all the other cylinders, do a 'Leak-Down' test to determine if the low compression is due to leaky valves (intake or exhaust) or whether the piston/rings are the problem. NOTE: If all the cylinders are withing 10% of each other during the compression test, the possible causes are, injector O-ring leak, vacuum leak at the intake manifold at #3 cylinder, or the spark plug not firing under compression.

Mar 15, 2009 | 2000 Hyundai Sonata

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