Sign up for FREE! Become a GM-Trucks.com Member Today!
In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience.
By Scott Lamb II
2008 Chevrolet Silverado 1500 LT 5.3 Vortec. 2WD. I've got a head scratcher here. So filling up the other day, I went to start the truck, and acted like it didn't have any fuel to start. Either that or fouled plugs. Took a few tries and started hard, idled rough for about a minute and then was running good. It's been cooler outside as its winter, roughly in the 20s and 30s. But the truck was already at operating temperature. It's happened twice now after I've filled up and no other time does it do it. Few things: Around 3 weeks ago I forgot to replace the gas cap, lost it on the road. Didn't replace it until the first time it started hard. I've recently changed the oil. Along with that I used a lucas oil additive made for variable valve timing. I also used a fuel treatment for carbon deposits. After looking with my telescope camera, it did its job. Now I did get 2 codes. P0171 and P0174. Bank 1 and Bank 2 Too Lean. Definitely running on the lean side. After this last hard start, I had my scanner hooked up reading the live data, Fuel Trim (Lngshft1 and Shrtshft1; Lngshft2 and Shrtshft2) was low. Lngshft1 and ShrtShft Bank 1 showed fuel trim at start up was -10.4% on Shrtshft1 and -25.6% on Lngshft1. Running very lean on bank 1, and bank 2 was also running lean. I did clean the MAF sensor, replaced the air filter. Check for vaccum leak for about an hour and could not find one. Fuel pump is good, runs just fine. Got out the multimeter and everything seems to check out. I'm thinking its possibly the fuel filter, maybe a bad MAF, purge valve, or O2 sensor. I've been researching for a few days and looking over the truck but cant figure it out. Rather than going through the task of replacing everything and hoping it works, I figured I'd see if anyone else and had similar problem and found the solution. It runs great any other time, MAF showing correct numbers, same with Fuel Trim showing normal numbers. It's only when I fill up. Maybe a fuel pressure issue somewhere.
Hello, I have a 2001 Chevy Silverado 2500HD, It has a 5.3L V8 Vortec engine with 288,000 miles on it. It has 265/75/R16 AT tires, Things that are original include 6/8 ignition coils, MAF sensor, fuel injectors, serpentine belt, ect sensor (ive heard of problems?) Things that have been done to the truck since I got it include Radiator and water pump, hoses, heater hoses, Spark plugs and wires, fuel pump and O2’s in October 2017. 2 new ignition coils (The other 6 are stock) Oil changes/new air filters, Valve cover gaskets, (Used Throttle body cleaner and MAF cleaner about 1.5 years ago)
When I 1st bought the truck in late 2016 was getting around 13-15 hwy which was good for me at the time. About 6 months in, the fuel economy started to decline, though it was not overly concerning to me yet, but within the last 6 months (around September of 2019) it took a hard hit. What was a decent economy, I only get 9 or 10 miles a gallon on the freeway, and don’t even get me started about the atrocity that is city driving. However, I have noticed that my Long-Term Fuel Trim on both banks is anywhere from 14-18% no matter when I check it, hot or cold, idling or at 2000RPM. No one has been able to give me any direction on how to recover any mpg's so far. I use the truck for work daily, I do a lot of driving, but still, it shouldn’t be so low! I just need some guidance here, as to where to (re)start as for fixing this thing. Thank you so so much if anyone has any types of input. Please help! somebody!
Hello, I have a 2008 GMC Sierra 1500 SLE Crew Cab 5.3L, no aftermarket parts or wiring in it, all stock.
I had ice on my windshield this morning, not thinking i tried to use my wipers and washer fluid to defrost my windshield. The wipers did not move at all due to the ice, so i turned turned the wiper switch back to the off position. After chipping the ice away, the wipers started in the constant low speed setting and would not stop! Tried turning the truck off but they stayed on. I disconnected the battery and reconnected but the issue continued, so i pulled the fuse as a temporary fix. Does anyone know what this could be??
To my understanding it could be the wiper pulse board, fuse box, or the wiper switch arm. The turn signals and washer fluid still work fine so i don't believe it would be the wiper switch arm.
I have checked online and it seems that others have had this issue but it happened randomly, so i'm hoping that since my problem seems to be directly from using the wipers when they were stuck, it may be an easy diagnosis.
Any and all suggestions would be greatly appreciated!
Recently Browsing 0 members
No registered users viewing this page.
Most OnlineNewest Member
Who's Online 204 Members, 1 Anonymous, 3,712 Guests (See full list)
- AK High Country
- f8l vnm
- Cool J
- Shawn O'Leary
- Malachi Maness
- Booger T
- Phillip Luckart
- Ray Pickle
- Ed P
- Nikolas Ryan
- The G-Man
- Rhonda Reed
- Scooter Scott
- 14 Silvy
- Mike GMC
- @[email protected]
- Bob Mac
- High Country Steve
- Maize & Blue