I've recently had my car serviced and it now comes up with a P0300, the service included both a timing belt and heated O2 sensor, I checked the spark plugs and they are fine. I would appreciate some help identifying the cause, thanks.
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I've recently had my car serviced and it now comes up with a P0300, the service included both a timing belt and heated O2 sensor, I checked the spark plugs and they are fine. I would appreciate some help identifying the cause, thanks.
Could be the plug wires, the coil, or oil in the spark plug tubes depending on the year.
it's a 2006 I checked plugs and tubes, haven't tested the coil yet. I had an aftermarket pod filter on the car, which I reverted to standard. idles better with original airbox, but issue still persists.
1. My Aveo's 2007 1.2 (petrol + LPG) engine started being not so calm and car was a bit more lazy, same day engine light went on and I had the same P0300 random misfire problem showing on my OBD reader. I did some research myself and tried to replace some parts new and some used... I got new ignition module, cables and spark plugs all for 50 €, also checked injectors at the local car electrician who said they are working good. Nothing helped. Finally my mechanic was available. I told him everything I tried (some sensors replaced, which I had sitting, used). Mechanic figured one cylinder doesn't work and he checked cables going to injectors. Cable of the suspicious cylinder didn't have power. I am not sure where is power for the LPG injectors coming but mechanic opened the big power connector where power for all for injector cables comes from and one had a bad contact. He pushed it a bit and all works now. Seriously? That is it?! No engine light, problem fixed. Engine purrs.
2. My car gives one all blinker flash when I unlock it with remote, but when I lock it, it doesn't. Also lock/unlock with a key, no flash. I am pretty sure it used to give flash when unlock with a remote. Any ideas?
1. I don't think it's one cylinder. I had checked how many missfires I was getting with a diagnostic tool, and it was saying that all the cylinders were missing at various times. Which makes it seem more likely to be an ignition coil issue or maybe a crankshaft or camshaft sensor issue.
2. Could be something simple, like a battery or debris inside the key fob, probably worth checking those and seeing what happens.
Are you sure that a diagnostic tool tells you which cylinder exactly, cause mine didn't? I think it just said multiple misfire. Mechanic diagnosed it by pulling out the spark plug cable and returning it one by one while the engine was working. Three times engine started working badly and with one plug nothing happened. That showed that that cylinder was already not working at all.
It seems that this forum is dead. We are not getting any answers.
Check all your connections first that s what I did to mine
This statement along with your earlier statement of a new timing belt is making me wonder if the belt was installed incorrectly causing all the misfires.Quote:
Originally Posted by Jaded_Crown
I wondered that, I did a bit of research, and it sounds like I should have a noticable amount less power, which I don't. The only thing different is the idle. I wonder if while it was apart if something may have ended up stuck in the intake manifold, potentilly affecting airflow.
Whenever a new issue shows up I always ask myself what was the last thing that was done on the vehicle. A high percentage of the time the new issue is related to the last repair. In this case it’s the timing belt.
It appears that timing is not the issue, timing is correct, and I also was recommended to clean the MAF sensor, which did improve the issue.
I do wonder if the ignition leads could be part of the issue, I'm going to check them in the next couple of days.
To add to this, just did an IACV, and now idle is consistently at 2500-3000 rpm when I go off of the throttle.