I am sure this issue has been beat to death multiple times, but I cant find the answer.
I have a 2005 Silverado 1500 z71, I have had this issue for about 2 years now. the issue being that no matter what part I replace my 4wd wont reliably work.
here is a list of what parts have been replaced.
Drivers side wheel hub- twice
Passenger Side wheel hub- three times
Diff. actuator- twice
4 button switch on dash- once
Transfer case motor- once
So what is happening is, the dash will read service 4wd, i have taken it in to a shop where they have been replacing the parts, and i have come to the conclusion they are just throwing parts at it to find a fix. Every time they would replace a part it will work about 2-3 days but then give me the same service 4wd message. if i push one of the 3 4wd buttons on the switch the light will blink for a while then stop and it seems like it doesn't shift into 4wd. But i have crawled under the truck while someone else selects a 4wd button, I can hear and feel the transfer case changing into to 4wd mode. but the front diff actuator does not engage. I have checked and cleaned the ground wire under the drivers door twice but that doesn't seem to help. I am done throwing money at the shop to fix it, so this is my last resort.
any help or ideas is greatly appreciated,
I got a 2016 Lifted (6 inch) Diesel Colorado with a 6 foot bed at the end of October. Since then I ran into an issue where you can hear a knocking noise from the front end when you turn while its in 4WD. I took it to the dealer and they have been trying to fix the issue but its going on 6 weeks (they had it for 3 weeks trying to fix the remote start before that).
They thought they fixed it with a new axle, one CV (?), new fabricated spacers, and tilting the transfer case i think.. I got it down to the end of the service entrance and it made the noise again when I turned. What can it be?
Today they tried to buy me out by offering me a new trail boss (very base model) and I would have to pay more than I am now and not have the bells and whistles my current one has (if I ever get to drive it).
I think I might have an injector issue. I'll first give the symptoms and what I've done to diagnose it, but the one thing I cannot find on here or the interwebs is how to replace the fuel injectors on my L86 engine. I understand it's a GDI engine and not as simple as a port fuel injection engine, but I figured there'd be something out there...no go. I'm pretty sure I've read every thread on here about cold start/injector issues, but pardon me if I state something that's already been said. Not looking to rehash any other threads, just get thoughts on my situation and others experience with replacing these GDI injectors.
My truck is a 2016 GMC Sierra Denali, 6.2L, 8 speed, 75k miles. Only run 93 octane fuel and all routine maintenance is completed on-time or early by me. Only use top end recommended products in all maintenance.
My issue is only a cold start issue and it's intermittent, but now happening more frequently. It drives fine with full-power and has no other issues. The cold start issue first came up around 70k miles when I did an auto-start in my driveway. I could hear the truck struggling to keep rpm's, it sounded like it was barely chugging along. I opened the door and looked at the rpm's and they were bouncing like crazy. Truck stalled out and threw a code for cylinder 3 misfire (P0303). I cleared it and it started up perfectly. I chalked it up to it needing spark plugs/wires replaced (had original OEM still in). I did so the next weekend with the OEM ACDELCO iridium plugs and Taylor 10MM racing wires (much better than stock). She cold started flawlessly for the next 5k miles and the issue was long gone in my mind. Fast forward about 3 weeks ago when it did it again after sitting in my work parking lot all day. The code this time was P0106 (MAP Pressure Sensor reading issue). I installed a CAI system (aFe Power Momentum GT) around 72k miles, so I figured maybe I accidentally messed up the MAF sensor in the install (even though it was fine for 3k miles). So I replaced the MAF sensor. Was fine until a week ago, when it had another rough cold start but didn't throw a code. I assumed it was the P0106 code again so I replaced the MAP sensor this time. Good for another week and now it's had 2 rough starts this week and stalled once right after starting, so getting progressively worse. This time it threw the P0303 code again.
I happen to be borrowing a tech tool and did a diagnostics check on the cylinders and it showed cylinder 3 has had 699 misfires, the next highest was 19 (both cylinders 6 and 8). I also checked the code history on the ECM and it showed P0106 (map sensor pressure fault), P0300 (multiple misfires), and P050D (cold start rough idle). I read the cold start rough idle can also mean coolant is leaking into the oil and/or through the head. I have not noticed my coolant running low, regardless I change my oil and just did it as recently as last weekend, but it's never looked milky or smelled like coolant. I also checked all the head bolts and around the head gaskets - didn't see any coolant.
Ruling everything out to this point, all I'm left with is bad seals on injector 3 that's allowing leak back during initial engine start - causing the misfires on cylinder 3. What's strange is that about 20 seconds after start-up the idle evens out and drives smoothly the entire time. It's only a rough cold start intermittently (getting more frequent), but no other issues. Am I missing anything?
How-to on replacing GDI fuel injectors?
I've read how costly it is for a shop to change out these GDI fuel injectors so I was hoping to do this on my own. I do 90% of my repairs/maintenance - with exceptions to major work. This is the first GDI engine I've owned so I don't want to jump into something and cause more damage - but I feel confident I can learn and do it right.
Are there any instructions/how-to's on doing this job? From what I understand, with a GDI engine the pressure is much greater in the fuel lines so it's important to properly relieve the pressure. Also, I've read that I may need to replace the fuel injector rails/lines when I replace any injectors due to the stainless steel being so soft that it will leak in no time after replacing only the injectors. I don't mind spending money on the right tools if it'll save me money in the long run. Thoughts on doing the job myself? PS - I've searched YouTube and Google for ANY instructions (even for other GDI engines) and have found nothing on how to bleed the fuel pressure, just videos about putting on new injector gaskets.
I’m not the handiest mechanic around so I ask you try your best to simplify your answers. First off, I have the four button 4wd and 4HI, 4WD Auto, and 4LO flash endlessly when I hit them, while 2HI stays solid. 4HI and Auto does nothing, no feeling or sound of engagement or anything, just flashes till I switch it. 4LO flashes but I feel and hear the clunk and it seems to have more torque. Any ideas where to start looking?
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