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06-10-2016, 05:14 AM
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#1 |
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Registered User
Join Date: Apr 2007
Location: pasadena,TEXAS
Posts: 880
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Hard starting problems on my 5.3
Here lately the 5.3 in my '02 Z71 has been hard to start. Instead of just turning the key and it starting I have to turn the key and let it crank a couple seconds more before it starts sometimes giving it a little bump on the gas. It is an automatic with around 135k miles on it. I did a typical tune up at 100k of plugs wires. I also just recentlt replaced the fuel pressure regulator. This problem has been with me for close to a year. Any ideas?
__________________
1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394 Last edited by hdff; 06-23-2016 at 03:35 PM. |
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06-22-2016, 12:29 AM
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#2 |
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Registered User
Join Date: Jan 2011
Location: Edinburg, Texas.
Posts: 194
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Re: Hard starting problems on my 5.3
A few things I have found that cause a hard start with your model are the fuel pressure regulator leaking, fuel pump failing or intake gaskets leaking causing a lean cold start. I would start by running the engine until warm, shut it off and disconnect the vacuum hose at the pressure regulator. Place a small piece of paper over the vacuum port on the regulator. The paper will get wet or change color if the regulator is leaking or seeping. This may take a while. If you have a fuel pressure gauge, monitor fuel pressure with the engine off and make sure the fuel system maintains pressure while the engine is off. If the pressure drops its usually either the regulator or the pump allowing pressure to bleed off. I doubt the intake gaskets are leaking because that usually causes a cold start stall condition.
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06-23-2016, 03:22 PM
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#3 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,217
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Re: Hard starting problems on my 5.3
Probably the pump starting to fail
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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07-09-2016, 12:00 AM
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#4 |
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Registered User
Join Date: Nov 2006
Location: Amador County, Ca.
Posts: 229
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Re: Hard starting problems on my 5.3
Sounds like a after you shut off the vehicle fuel is leaking back into the tank. The first time you try to start it, re-primes the system. The second time, it finally starts.
__________________
1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400 |
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07-25-2016, 05:53 PM
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#5 |
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Registered User
Join Date: Jul 2016
Location: Erfurt
Posts: 51
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Re: Hard starting problems on my 5.3
Hej .. have u ever tried to check your obd II live datas.
I had the same problem and checked all the datas I could get using my obdIIscanner. After I have changed sparks, ing cable, fuel pressure regulator and the fuel pump inkl filter and checking the ignition coils I got the solution. Took a long time ... Stef |
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