What’s up guys,
Having a random cold start rough idle issue with my ‘16 suburban with the ecotec 5.3. This happens completely randomly, typically when colder temperatures outside but not always. MIL will be triggered but will go away after some driving. Some instances it flashes and then will go off. Sometimes when the light is triggered the ABS and stabilitrack light will be on and the transmission will roughly upshift and downshift. The indicator light will go away and typically the shifting will be fixed by shutting the vehicle off for a period of time and then re-starting everything will be back to normal.
From what hat I have gathered U0401 means that the transmission control is not getting good signal during these times.
In regards to the engine, I have between 5-20 misfires counts on all cylinders except #7 which has 80 and #8 which has over 6,000.
Obviously there is a problem with #8, being a non AFM cylinder and being of random occurrence I’m thinking injector or coil pack. Any thoughts?
So for the last 6 months or so my truck has been throwing P050D cold start rough idle. I'm at 36k on the truck and it's a 2015. I brought the truck into the shop for diagnostics. They confirmed that for 1-2 minutes on a cold start condition, cylinder 4 misfires for about a minute or two then stops. They confirmed this multiple times. They verified no vacuum leaks, spark plugs and ignition coils checked out fine, bore scoped the cylinders and found no issues and no coolant leaks, they did a bunch of rebalancing and program checks, verified the related sensors, essentially everything with the exception of checking the injector itself because of the process and time it takes to do so. I know that these newer trucks send double pulses to the injectors during cold start until the truck warms up then it goes back to normal pulse frequency. I guess my question would be what is more likely? The fact that the injector is bad or that during the cold start the injector isn't receiving the pulses? I imagine that all the injectors would be wired in parallel to an extend and that all injectors would essential receive the same signal so I feel that the later is less likely and more than likely the injector itself. But the auto shop won't confirm that the injector is the actual source of the issue because they couldn't test it.
I have an 02 Silverado 1500 4WD with a code P0443 (and a P0171, but I don't know that those are connected). However for now I am working on the P0443 code, Purge Valve Solenoid Circuit?
What I have done thus far: 1) Bought a new Purge Valve Solenoid, check engine light w/ code still on after clearing codes. 2) I tested the old and new solenoid with a power probe and blowing through to make sure it is engaging. ie. air can flow through with now power, but after power probe initiates the valve shuts and can no longer allow air to go through purge valve solenoid. 3) Attempted to test if power was going through to the plug going to the purge valve solenoid, appeared to be getting 12.3v. I'll admit I'm not electrical savvy, but I seemed to get voltage to the plug when the key was turned to "on" position.
Thanks, what else can I look at, or re look over?
Hi guys, I need some help.
On Thanksgiving I had remote started my truck to go make the last minute run to the supermarket. As I left my house to jump in and take off, I found the truck’s engine had stopped. When I started the truck with my key, the check engine light was on. I took it over to my local dealer and after a week and a half, I was told my aggressive treads (Nitto Trail Grapplers) could be the cause. The work order stated the tech swapped out my wheels and tires for a set of factory wheels and tires and could not get it to misfire. The work order also stated that code P050D was found. I did read in several treads this has come up and injectors was normally replaced. My truck was purchased in Oct 2014 and had 25606 miles on it when I took it in. There are a ton of lifted, leveled, stock trucks out there with the same tires so was wondering if anyone else had this issue. It’s really hard to accept that my tires (which has been on since 2014) is the cause.
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