Johnnyb46

I want to knw do I have a bad or leaking head gasket problem I changed spark plugs coil packs and my car is still showing signs of miss fire but only on the bank 1 side cylinder 134 keep showing songs of misfire doing start ups car checks engine light flashes a couple times then stops and cars idles fine I’ll clear the codes it won’t come back but when u drive it it’s good no power lose or anything just that lil tiny shake in the engine every now and then from missing but no check engine light what can it be is my engine bout to go or the head gasket bout to go on that side I’m lose

juanmor40

May I ask where the idea of a bad head gasket is coming from? Is the engine overheating? is there oil mixed with coolant on either reservoir? Are you adding missing coolant w/o any sign of leakage anywhere (burning coolant)?

Perhaps you are referring to an intake gasket between the intake manifold and the engine block. They are very different issues and very different prices when repairing.

Johnnyb46

I was reading about code p0300 and that’s how I came about the head gasket but no leaky coolant or overheating engine Just cylinder 13&4 misfiring

juanmor40

P0300 is a generic misfire code. P030x where x is the cylinder number is the specific cylinder misfire code.

Misfire can be caused by many things since it means the combustion is not proceeding as expected, so it can include:
1 - Bad spark plugs (worn/broken)
2 - Bad ignition coil packs (worn/shorted/cracked)
3 - Bad wiring from ECU->Ignition coil packs (damage wiring, oil in the harness)
4 - Bad injectors (worn, dirty, clogged)
5 - Bad wiring from ECU->Injectors
6 - Air leak in the intake (intake gasket)
7 - Bad fuel pressure (fuel pump damaged, clogged, etc)
8 - Bad valves (burned, carbon build up, etc) --> Lack of compression
9 - Oil in the combustion (worn engine) --> Lack of compression
10 - Coolant in the combustion (head gasket)

There is plenty of issues before getting to the worst ones at the bottom. There are steps to isolate each of them before changing parts. But a blown head gasket will have more than just a misfire.

Johnnyb46

ok thanks yea I change spark pings and coil packs I think it might be a fuel injector but I had been putting injector cleaner in my gas and the fuel pump doesn’t seem to be bad it starts up everytime with no hesitation the performance is still der it’s just missing a lil and I’m Getting them codes ima out a screwdriver 🪛 on the injectors and listen and see if they all are good

Johnnyb46

ok I came from the shop and he checked my spark plugs they are black he says my passenger side is getting to much gas on that side I’m thinking my piston are going as or the walls or it might had jumped time

konigstiger

How about this...

juanmor40

No guessing. You need to scan the vehicle with an MB-specific tool and look at the live data for the engine. You may have a fuel pressure/injection issue. If you engine oil level is constant or within specifications, say 1 qt per 5K miles, your engine is doing fine.

The keyword with these engines is diagnostic, diagnostics, and one more time diagnostic. If you have the money to throw parts at it w/o a diagnostic, I have a bridge for sale .

The MB diagnostic tool can even measure the stretch of the timing chain, and tell you if you are off-timing w/o removing a single bolt.

konigstiger

Of course codes but think of what simple smoke test might quickly reveal.

juanmor40

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A lot cheaper than taking the head apart, or looking at pistons (even with a boroscope). Live data as Dan did, leads to the next step in the solution approach. The static codes cannot tell us more.

Thank you for posting Dan's video. I had forgotten about it.

Johnnyb46

I made a appointment to drop the car off to the dealership this Thursday coming up hopefully they can find the problem and I’ll keep you guys updated