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#1
11-23-2005, 07:06 AM
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Problems starting! Please help!!!!!!!!!!1
99 with 5.3 problems cranking. Cranks up good. When you shut it off and wait 5 to 10 minutes cranks back up fine. If wait hour or more it dont want to crank. It will spin over for about 5 to 10 seconds befor it cranks. If it sits over night and you crank it, it cranks up fine.
Use to have problems with idling but that problem has disappeared. Have noticed since it has started getting cold that untill it warms up it runs very poorly, spitting, sputtering, and backfires. Once it warms up it runs with no problems. Want to fix the problem badly. Went to Auto Zone had it put on their computer and it said it was a firing problem. Changed plugs and wires but nothing else. 
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#2
11-23-2005, 07:30 AM
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Re: Problems starting! Please help!!!!!!!!!!1
If it's a firing problem, I would suspect your coils. However, the way you described the starting problem, it sounds like fuel filter and/or fuel pump
__________________
   "When I step on the gas, I want people to think the world is coming to an end!" - Homer Simpson 2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
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#3
11-23-2005, 12:27 PM
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My friends '99 did that. We suspected the fuel pressure regulator on the driver's side fuel rail. Pulled the vacuum line and fuel dripped out. He replaced the regulator. That solved his problems and his fuel mileage increased.
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#4
11-23-2005, 08:34 PM
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Re: Problems starting! Please help!!!!!!!!!!1
Are your battery cables tight, or have you had it tested? If it doesn't want to crank after it 's warm, you may want to look there first. (By "Cranks", I'm assuming you mean it turns over, but doesn't start. There's a big difference between "Cranks fine", and "STARTS fine")
(Recent cold weather also can cause alot of IAC problems, I've been starting to see quite a few of those pop up in my shop lately. You may need to clean it, and the throttle body as well. I believe GM has a TSB about this, Hard start, poor idle, etc.)
__________________
ASE Certified Automotive Technician ASE Certified Service Consultant ASE Certified Parts Specialist Employed at an Independent Shop Vehicles: 2005 Silverado LS Crewcab 4X4 1979 GMC 4X4 Jimmy 1977 Chevrolet C20
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#5
11-23-2005, 08:39 PM
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Re: Problems starting! Please help!!!!!!!!!!1
100% fuel pressure reglator
__________________
Matthew Brough  1997 Geo Prizm -- 301,000 miles 2000 Honda Accord -- 225,000 miles 2004 GMC Yukon XL -- 223,000 miles 1987 Jeep Comanche -- 116,000 miles 
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#6
11-23-2005, 11:54 PM
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Re: Problems starting! Please help!!!!!!!!!!1
Fuel Regulator
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2001 5.3 LS Stock 6 channel Alpine 3566 Amp Jason Extreme Slam Camper Shell Michellin X-Radials 79K Miles
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