2002 Chevy Silverado 2500 8.1 Rough Start Car

Username	Post: 2001 chevy hard starting (Topic#253380)
t_e_b_3 Forum Newbie Posts: 13 Reg: 11-03-10 User Info Send Private Topic View Profile	11-26-10 08:26 AM - Post#2009694 2001 chevy 2500 hd 4x4 w/8.1L. Truck has about 150,000 on it. starts hard have to to crank it for about 30 sec or more. Thought it was a week fuel pump, but fuel pump went bad and has been replaced and it did not cure the problem. has new fuel filter, plugs and wires. what should i check next? thanks Email Report

black95jimmy Senior Member Posts: 9356 Age: 77 Loc: Venice, FL Reg: 01-05-02 User Info Send Private Topic View Profile	11-26-10 09:10 AM - Post#2009706 In response to t_e_b_3 FPR. 82 Monte Carlo SC, 355 w/Vortec heads, roller rockers, 625 Demon Carb, TRUE DUALS. 2009 Sub.5.3L LTZ 30 Gallons of gas @ $2.28/gal. bla bla bla. Email Report
t_e_b_3 Forum Newbie Posts: 13 Reg: 11-03-10 User Info Send Private Topic View Profile	11-26-10 09:16 AM - Post#2009708 In response to black95jimmy that was what i was thinking just making sure their wasn't something that i didn't know about. thanks Email Report
alanco Forum Newbie Posts: 42 Age: 82 Loc: Fallon, Nevada Reg: 11-18-10 User Info Send Private Topic View Profile	11-29-10 02:17 PM - Post#2011187 In response to t_e_b_3 Plug in a code reader and look for codes. When they don't start almost immediately it is either ignition or fuel injection. However, I am certain that you have a check engine light and it is throwing a few codes. Cold starting problems are the fault of the cold start circuitry which enriches the overall air fuel mixture. Hot or any other starting condition is the air fuel mixture. You can test it simply by using carb spray and giving it 2 seconds of carb spray, then cranking. If it starts immediately then it is your fuel injection. Since this is all computer driven, you have to look for codes and fix the bad codes....... I would not suspect the FPR because it does not cut off fuel, only has a window of regulation. Since it starts and runs, it really can't even be the regulator.... 80 Olds Cutlass built as a pro cruise car: 355 Chevy 2004R OD Trans, 8.5" 4.11 4 link rear. 01 Pontiac GrandAm SE 4 cyl 06 GMC Sierra 2500 4x4 LongBed ExCab w/Duramax Diesel 84 S-10 Blazer 5 sp manual, 4wd V-6 engine Edited by alanco on 11-29-10 02:21 PM. Reason for edit: No reason given. Email Report
black95jimmy Senior Member Posts: 9356 Age: 77 Loc: Venice, FL Reg: 01-05-02 User Info Send Private Topic View Profile	11-30-10 06:25 AM - Post#2011543 In response to alanco Quote: I would not suspect the FPR because it does not cut off fuel, only has a window of regulation. Since it starts and runs, it really can't even be the regulator You could not be more WRONG on that statement. A leaking FPR will cause excess fuel in the vacuum lines, causing a very rich mixture at first. It will start, but run like crap until the excess is gone. 82 Monte Carlo SC, 355 w/Vortec heads, roller rockers, 625 Demon Carb, TRUE DUALS. 2009 Sub.5.3L LTZ 30 Gallons of gas @ $2.28/gal. bla bla bla. Email Report
CaptainK Senior Member Posts: 8252 Loc: Maryland Reg: 02-25-02 User Info Send Private Topic View Profile	12-01-10 03:48 AM - Post#2011990 In response to black95jimmy I have just begun noticing these hard start symptoms in my 99 Silverado. Looks like a new FPR is in my near future...... '99 Silverado (NBS) Email Report
Ezrider Member Posts: 8 Loc: lucerne valley, califonia Reg: 09-28-02 User Info Send Private Topic View Profile	12-01-10 04:22 PM - Post#2012227 In response to CaptainK 2001 8.1 could be the crank position sensor there was a recall on them and they can cause hard starting problems and can also cause the engine to stall, check the fuel pressure while running and also while turned off. check for spark while cranking need to figure out weather it is spark or fuel related. to check the regulator you can take the vacuum line off and see if any fuel comes out where the vacuum line attaches. 1988 chevy camaro 1980 datsun 280zx 1983 chevy suberban 4x4 Email Report
Boog Super Senior Member Posts: 4013 Loc: Central Arkansas Reg: 04-28-02 User Info Send Private Topic View Profile	12-02-10 04:07 PM - Post#2012724 In response to Ezrider Be sure to check for gas in the vacumn line after just shutting the engine down as sitting over night the gas will drain back out of that line and give the appearance the fpr is ok. I recently went through this with my 2000 GMC. I posted what I did in another forum. Here's the link. http://67-72chevytrucks.com/vboard/showthread.php?... Boog 69 Chevy step 06 GMC ccsb Z71 09 Yukon slt 4 wd All GM...'nuff said! *JR Nation* Email Report
kashin Forum Newbie Posts: 64 Loc: Mt.Pleasant, Pa. Reg: 09-12-10 User Info Send Private Topic View Profile	12-05-10 12:40 AM - Post#2013704 In response to Boog father in laws truck shut off on our way hunting today. Cranks and wont start. I changed filter and no fix. auto store suggested fuel pressure regulator....Where the heck is it located.2001,4.3 silverado 2 wheel.Thanks Wait! I just saw the link with a pic previous to my question.MY truck does not have a fuel rail that the pic in the link does but that is the exact FPR they gave me. My fuel lines go into the rear of the intake,??? SO WHERE WOULD My REGULATOR BE.did they give me the wrong one?? Edited by kashin on 12-05-10 12:46 AM. Reason for edit: No reason given. Email Report
kashin Forum Newbie Posts: 64 Loc: Mt.Pleasant, Pa. Reg: 09-12-10 User Info Send Private Topic View Profile	12-05-10 05:27 PM - Post#2014040 In response to kashin found the fpr and it is under the platic section of the intake(why I have no idea) but that was not the problem. must need a fuel pump Email Report
ChevyHD Forum Newbie Posts: 6 Loc: EC MN Reg: 07-07-10 User Info Send Private Topic View Profile	12-16-10 09:03 AM - Post#2018814 In response to kashin Does it start hard after truck has sat over night or a long period of time or does it just start hard after you've drove and engine is warm and has been shut off for 15-20min? Email Report
Stefko Poster Posts: 53 Loc: Vernon, N. J. Reg: 07-17-08 User Info Send Private Topic View Profile	12-28-10 05:18 PM - Post#2023759 In response to t_e_b_3 Pump pressure checked with the proper tool? My 2000 van had hard start problems from a bad rotor(high resistance between the spring steel and the thicker bar). In addition, a short draining the amps out of the battery has also been a problem. 13 volts work well. 12.5volts did not. I attached a Sears trickle charger up to the battery and had a red trouble light come up at first. The following morning the trouble light was off, full charge was on and the van started just fine. My instrument gauges come back to life 10 seconds after removing the key from the ignition. Email Report
Stefko Poster Posts: 53 Loc: Vernon, N. J. Reg: 07-17-08 User Info Send Private Topic View Profile	12-28-10 05:30 PM - Post#2023767 In response to kashin Invest in the right tool to check the pressure. It is worth the investment. you will use it for the rest of your life. And I forgot to mention that the coolant temp sensor measuring more than 5 degrees difference from the air temp sensor when cold can be a problem. Edited by Stefko on 12-28-10 05:34 PM. Reason for edit: No reason given. Email Report