replaced ignition switch and it will not turn past the run position
Hello I want to start off by saying that I am new here, so I apologies if this is in the wrong location. Anyways getting to the point, I own a 2001 Chevy Silverado ext. cab with the 4.8. and I had to...
View ArticlePuzzled by wet weather issue
So...2003 4.8L, automatic, stock. 209,000 miles. In normal driving, most days, no issue, have driven a few hundred miles in a day without a problem. But, about a month ago, I went through a puddle,...
View Articleintake manifold and throttle body
4.8ltr changeing to jegs intake amnifold and 92mm throttle body to i need bigger injectors than the stock ones lot ppl telling me to upgrade to bigger cc injectors is this true if so what would you...
View ArticleFuel cross over tube fitting retrofit
I recently disasembled fuel rail and cleaned my fuel injectors that were clogged and caused my truck to stall while driving and than had to get it towed due to no start on my 2005 4.8L. I am happy with...
View ArticlePO3O2
Hi...just picked up a 2000 Silverado 1500 LS and this flashing code is coming up...plugs and wires are new...swapping the coil on #2 cylinder did nothing...cleaned MAFS...clean air filter...if not...
View ArticleTAC module/ TPS/ PPS issues
03 Chevy Silverado 4.8 ext cab 2wd. Brand new 0 mile trans bought from Napa and I just installed a couple weeks ago. Been trying to get truck out of reduced power ever since. I'm new here so sorry if...
View ArticleFuel or Idle issue?
I've got a 2000 silverado 1500 4.8 2wd ext cab. I just replaced the fuel pump at 169k miles (was making noise and stalled out a couple times) I replaced it with an ac Delco pump and also replaced the...
View ArticleReplaced Alternator. Now won't Start. Won't even Crank.
To start with the truck engine worked fine but the headlights were flickering and we were told it was the alternator so we replaced the alternator. After replacing alternator the truck will not even...
View ArticlePedal lag 4.8
RedSLEd said: Yep, it's normal. They're tuned for MPG and low emissions. There are ways to improve it. Click to expand... What might be the cheapest way to get rid of that lag in the pedal? I have the...
View ArticleLeaking coolant - what is this hose in the pic?
Ok, lately I've been leaking coolant. I have a pressure tester on it. The system won't build pressure at all. I can pump pressure in it all day and it never gets above 0. But, I now see a leak. Under...
View ArticleLoud whine and clunk noise .
I Let off the brake and I can hear a strong whining sound then followed up with a CLUNK! noise . I can feel the Clunk underneath my feet . Please help!!!!
View ArticleWhining noise
Recently picked up a 2002 GMC Sierra 4.8 auto because I needed a rear end. Fixed the rear drives good. My engine is now making a very loud noticeable whine coming from the back of engine driver side....
View ArticleHelp needed throttle sensor question
So I just got a P0121 throttle position sensor 1 engine code. Problem is I look online for 2007 Silverado throttle position sensor and it seems they're are lots of sensors all looking different to each...
View ArticleLong crank after sitting 30 + mins
Hi guys, First time poster here... I picked up a 2001 silverado ext. cab about 6 weeks back and have been chasing this issue where if the truck is sitting for about 30 minutes of longer, upon restart...
View ArticleFluctuating oil preasure
Okay not sure if this is actual oil pressure as it's only just occurred. Oil pressure gauge is fluctuating between the half way point and 275kPA on the gauge (so is the battery gauge between 14 and 12V...
View Article2008 Silverado 1500WT / 4.8L - Inconsistent misfire.
I have a company truck that i have been unfortunately tasked with maintaining, it has an inconsistently occuring misfire/stall, sometimes it misses under load, sometimes it happens at idle, sometimes...
View Article01 Silverado high idle..... Very high idle
Hello everyone, new to the forum. I've searched and looked thru any related issue post and none are quite like mine. This will be long, so bare with me. I'm not exactly sure when this started, but when...
View Article4.8 LS killing oil pressure sensor
Can someone please help me I can't seem to figure out why my 4.8 is killing oil pressure sensors kill mad I drove it like 35 miles away from home made it half way back and the low oil pressure came on...
View Article05 Silverado with 4.8l start and instantly die
This truck starts right up and dies a second later. I've checked all the fuses and relays and everything seems good. I took the cover off from around the fuse box and checked all the wires and cant...
View Articlerear main seal replacement cost
i think i have a leak in the rear main seal im going to the shop to get it fixed how much do you think ill have to pay?
View ArticleTruck overheating and i am stumped
Guys I am completely stumped on this one. My silverado has over heating issue. Only at idle with the a/c on. It takes 30-45 min to start getting hot. So stop and go traffic Is not a problem. So when I...
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Starter too close to flywheel
Hello, I just installed a 4.8 in my 99 Silverado with a nv3500. But I’m having a problem with the starter housing hitting the flywheel. And due to the starter being so close, the starter gear is always...
View ArticleOverheating with Coolant Back Pressure
https://www.silveradosierra.com/threads/truck-overheating-and-i-am-stumped.745874/post-7447821 I'm described the issue in the other thread. To be succinct, my Silverado 1500 the overheating after...
View ArticleNew water pump but still leaking
I had a small coolant leak that was landing on my serpentine belt and flinging all over my engine compartment so I changed the water pump, gaskets, thermostat and housing. But this morning I noticed a...
View Article09 4.8 slight miss at idle
Hey Everyone. I'm New to the forum. I'm an ASE Certified Technician and all that crap. This is a question about my own personal truck. I bought the truck about a year ago. She's got some miles on her...
View Article2010 Sierra 4.8 crank no start no codes
Hello everyone, I have a 2010 Sierra 4.8 with this crank no start that has me stumped. My truck will just crank and never start. I have an autel scan tool that allows me to prime each injector to test...
View ArticleClicking Sound
When I crank my truck and let it idle for about 5 minutes there is a clicking sound from around the gas tank, what would that be closed loop or open loop?
View Article2011 Chevy Silverado over heating
My 2011 4x4 1500 Silverado 4.8L seems to be overheating normally the temp. Gauge reads 210, what's very unusual is that this seems to be an intermitted problem that the temp, will be at 210 and reach...
View ArticleReduced engine power
I just bought a 2007. On the message board "reduced engine power" shows up, throttle body was replaced before I bought it. When I plugged in the obd2 scanner code P0068 MAP/MAF Throttle Position...
View ArticleP0300 & ABS Light? (2001 GMC Sierra)
Hello everyone, this is my first post so it may not be written up correctly. I’ve searched through the forums and have yet to find a similar thread. Just recently I bought a 2001 GMC Sierra regular cab...
View ArticleLow idol after bat terminals disconnected for a week
While replacing starter on 2003 Silverado 1500 4.8ltr, I disconnected battery terminals for about a week due to other issues needing repair (I damaged crankshaft sensor wire harness) After the...
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Leaking coolant on head.
Been having an issue with coolant leaking and thought the reservoir was the problem. After smelling burning coolant I looked around and on both heads it has developed a little puddle. Is this a head...
View ArticleInstalling Oil Cooler possible/worth the hassle?
So recently, my radiator has started leaking pretty bad. Need to replace it soon. My radiator only came with two ports from the factory, just for the transmission lines. I also do not have a motor oil...
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Best Upgrade for 4.8 performance!
I have a 2010 4.8L V8 and I'm wondering what I can do to get that quick response feeling in the pedal! I haven't touched anything in the engine and would like a good list of engine upgrades to add that...
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