(English) P0300 problem

[lordmmx]

Hello chevy guys,

I have 2005 Chevrolet Evanda 2.0 with Automatic gearbox and I have P0300 issue that I can't deal with for some reason.

First of all, weirdest thing is that P0300 appears only when car moves, if i'm parked i can do whatever i want with engine from idling to reving it to the limit. no p0300 will appear. but once car gets into motion, p0300 appears after some time - after a minute or after 5 minutes and stays on until i don't stop and shut down the engine.

also car looses just a little bit of power but it's not shaking or doing any weird stuff, idles normaly, runs normaly, but check engine light keeps flashing.


I have already replaced spark plugs, cables, coil, also replaced oil in gearbox just to be sure there is enough so it does not cause any shifting problems that could end up in p0300 dtc.

Compression is:
cylinder 1 - 15.5
cylinder 2 - 16
cylinder 3 - 15.5
cylinder 4 - 15.5

Last thing I'm about to replace is knock sensor.

I have changed my tactics from searching on the internet and asking people around to just go balistics on that car and use parts canon [replace everything I can think of], but still p0300 shows up.

[bodzio204]

Twoje pomiary ciśnienia to bardzo ważna informacja, że problemem wypadania zapłonu nie jest dół silnika - czyli pierścienie, zawory, tłoki, rozrząd.
Szukałbym raczej w wtryskiwaczach, woda w paliwie, ciśnienie paliwa, czujnik halla, nieszczelność w układzie dolotowym, świece, cewki(kable).

[lordmmx]

cables, coil and spark plugs are new. Replaced just recently.

Where is hall sensor located?

[BeKa]

crankshaft position sensor is behind AC compresor. did you check fuel filter? maybe its too lean mixture ?
you can try check timing belt synchronization too?

[lordmmx]

I have only P0300 error showing up. I had error P0342 before, but it was fixed by replacing camshaft sensor.
I can replace crankshaft sensor, not sure if it will help as the car starts normaly.

About fuel fiter, I do replace every filter with oil change (oil, fuel, air, interior) so fuel filter is new (2000+ km)
I'll get timing belt sync checked.

[lordmmx]

So, timing belt is okay, it's spot on.

Today I got evanda hooked up on way better diagnostic and it showed me that i get missfire on cylinder 2 and 3. at the same time and same amount.
Changed sparkplugs, changed cables again. still cylinder 2 and 3.

[BeKa]

2 and 3 is on same ignition coil. if you got another one try chainge it

[bodzio204]

Właśnie, współnym punktem 2 i 3 cylindra jest cewka zapłonowa

[lordmmx]

missfire on 2 and 3 happens with ignition coil that is brand new, but i'll try old one again with diagnostic tool connected.

[lordmmx]

I'm suspecting ECM / ECU to be faulty.
I have spare one but it's from evanda with manual gearbox. I've opened them up both and they look identical inside - wiring, components, everything.
But when I install it to evanda, gearbox stops shifting - jumps into 3rd gear and stays there.

Is there a way how to make ecu talk to automatic gearbox? like a firmware reflash or something.

it's MR-140 ecm