Last post on Oct 13, 2013 at 7:47 AM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck
#204 of 421 Hard Starting 5.3L
May 21, 2008 (10:13 pm)
Have a 2001 GMC Sierra 1500,5.3L with 144k miles. Recently developed hard starting problem. No trouble codes present.Cranks with no start until 3rd attempt. Probably would start with one attempt if I didn't let up on starter. Prefer 3 short attempts to avoid damaging starter. Occurs after shutdown of approx 5 minutes or overnight. Will start OK if you shut down and restart immediately. Fuel pump and filter was replaced at 120k miles. Runs fine otherwise from idle to WOT. Have noticed after shutdown,can hear noise in the fuel tank that sounds like fuel pump is still operating or more likely pressurized fuel is returning to the tank. Replaced original plugs and wires since they were long overdue. Truck has run flawless since purchased new. Any ideas where I can start to troubleshoot ?
#205 of 421 96 sierra high idle speed
May 22, 2008 (4:31 pm)
I have a 96 GMC sierra that speeds up it's idle not at first,but as soon as it warms up,to about 1400 rpm. I also seem to have an excessive amount of vacuum or just very strong vacuum. Other than that it runs well.
This is a 305 with central sequential injection.
Any feedback is highly appreciated!
May 23, 2008 (6:29 pm)
hi, i have a 95 Sierra as i took off from a stop sign it suddenly starting sputtering and then died,restarted it and got home after alot of effort.replaced the fuel filter,no difference.it will sit there and idle just fine,rev's up good just when i put it in gear it will bog down and then do a surge of running good,then bog down again.fuel pump or something else?i am at a loss,need some advice badly.thanks
#207 of 421 Re: what the heck [coyotehunter]
May 27, 2008 (4:46 am)
I had a similar set of symptoms on an old car once. I found that the air duct going into the intake was cracked between the air sensor and the manifold. Everything was fine untill I put it in gear, then it would bog out and die unless I VERY SLOWLY fed the gas and built up speed.
The replacement was pretty expensive from what I remember. If this is the problem, a half of a roll of duct tape will work just as good as a new air duct!
Good luck, let us know!
#208 of 421 1994 GMC Sierra all of a sudden bogging down
Jun 01, 2008 (1:44 pm)
Yesterday out of the blue all of a sudden my truck started bogging down, and the fuel gage went from half a tank down to E so I turned around and pulled into the gas station put 20 bucks in and started out of town again....well it didn't stop it kept bogging down especially when I would go to take off....then it took forever to get home, cause I had to go really really slow to get up a hill and had to roll back down one cause it just wasn't going. I checked the fuel filter and it seems fine. Do you have any ideas??? There was no warning it just started bogging down when I accelerate. I'm going to check it out again here in a sec, any ideas would be greatly appreciated.....Thanks! it acts like its not getting enough gas or something.
#209 of 421 Re: 1994 GMC Sierra all of a sudden bogging down [jpmoore]
Jun 01, 2008 (2:15 pm)
Make sure your fuel pressure is with in specs. Running a vehicle low or out of gas over heats the electric pump and will sometimes cause it not put out enough fuel pressur. Curious that you had a fuel guage issue prior to this. I think that the fuel pump and sending unit are one assembly on the year.
#210 of 421 Re: 1994 GMC Sierra all of a sudden bogging down [mickeymouse2]
Jun 03, 2008 (2:19 pm)
Thanks, we went and got a fuel pressure gage, and we are going to check it now. If the pressure isn't accurate shoule we replace the fuel pump? Thanks again for your reply.
#211 of 421 fuel pump connectors getting HOT!
Jun 09, 2008 (8:16 am)
Strange problem. Noticed during warm weather fuel pump would not come one unless i reached under and "jiggled" the connection. then fine. I checked it yesterday and it is getting really Hot at the connector as the truck runs. I cleaned the connection and checked that the ground is still good. Fuel guage works fine. During winter I have less or no problems with this. Right now if you start and run for 10 minutes, the connector and grey wire (power) are very hot to the touch. The diagram shows a capacitor in the pump, what are chances it is bad and discharging all the time? After running for awhile and shutting down, I will have to "jiggle" connection again to restart. Trying to avoid new pump if possible. Thanks guys.
#213 of 421 Re: ABS problems [mac53]
Jul 21, 2008 (8:45 am)
I now have identical problem with my 2000 Sierra 4X4. Dealer is estimating $650 to replace hub, etc. Too bad, as only have 70K miles and bearings are fine. Others are telling me to clean the sensor, once I have access to it. I am most interested in the recall issue. I have never received recall notice on this issue. Did you learn more about a recall? What was your resolution of the abs problem. Thanks