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Any ideas about my Intermittent Rough idle?

Posted: August 14th, 2018, 7:01 pm
by LagsLux
Hi,

So, I have a 2011 model with a 4JJ1 with 150,000 k's on it. It gets an intermittent rough idle whenever it feels like it. The gearstick wobbles, car rocks, and it sound really rattly when driving it. I don't notice any loss of power or any other symptoms other than the rattly noises and knocks. It has been doing it for quite a while now. But then I can turn it off, come back to it, and start it again and it runs like a dream.
I have recently changed out the SCV hoping it had something to do with it, and I have since blocked off the EGR to eliminate that from the system. Eliminating the EGR has helped a lot with the knocking/tappy noises that come with the rough idle but has not stopped the rough idle. I've checked and cleaned all the sensors.
I know rough idle is usually indicative of an injector problem, but as this is only doing it intermittently I am doubting it's an injector?
Any ideas guys?

Re: Any ideas about my Intermittent Rough idle?

Posted: September 13th, 2018, 11:55 am
by pedropajero96
It would usually point to the EGR, but if you have blocked it off .... dont really know.
I have heard of there being problems blocking off the EGR with it throwing error codes, and i think the fix was to drill a hole in the blanking plate. You would need to investigate this further.

Re: Any ideas about my Intermittent Rough idle?

Posted: September 13th, 2018, 2:16 pm
by LagsLux
Egr delete plate fitted and a resistor put in the maf sensor to stop it throwing fault codes. This has only been done to rule out the egr valve and won't be fitted ling term. I am thinking a vacuum leak possibly?

Re: Any ideas about my Intermittent Rough idle?

Posted: September 28th, 2018, 5:45 pm
by amtravic1
I had a similar problem a while back although the problem was more constant. I had a lack of power and a rattly engine. Turns out some cold night a rat decided to climb up on the engine and had chewed a couple of hoses.

Re: Any ideas about my Intermittent Rough idle?

Posted: November 15th, 2018, 10:14 am
by jazzeddie1234
I had a rough idle which went away sometimes if I restarted, then became more frequent. The local injector guy charged a small fee to whip out the injectors and test them. They were faulty.

Maybe check all your injector connections?