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1999 Silverado - Intermittent lack of power after start
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azchevy
New User
Jun 11, 2009, 7:53 AM
Post #1 of 7
(4393 views)
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1999 Silverado - Intermittent lack of power after start
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Hello everyone. Vehicle details:
1999 Chevy Silverado
4.8L
~136,000 mi
This is kind of a difficult problem to explain as it is not constant. Occasionally, my Silverado will act like it's not getting any fuel or air to the engine when I start it after it's been sitting for awhile. When I press the gas, there will be a lack of response from the engine, and often times the engine will almost die or will die until I back off the pedal. This doesn't happen very often, but this week I am in a higher elevation (about 7000ft compared to 1000ft) and it is happening worse than ever. This morning when I started it, the engine couldn't even rev up to idle and it died. When I restarted, it seemed to idle better. I am at a loss to explain what this is because it only happens when the engine is cold. Once I've been driving it around for a bit, the problem goes away. I was thinking it could be an O2 sensor, but shouldn't the ECM be running in open loop until the engine is warm? I've also replaced the EGR valve, spark plugs and wires, fuel filter, and cleaned the MAF Sensor in an attempt to fix the problem. Any help would be greatly appreciated! Thanks!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2009, 9:15 AM
Post #2 of 7
(4382 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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The first thing I would look at is fuel pressure. These systems are super sensitive to pressure and a loss of only 5 pounds can cause that. Try to rig a fuel pressure gauge so you can observe it while driving to watch for a pressure drop.
The spec is
Fuel System Pressure Key On Engine Off 55-62 psi
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Guest
Anonymous Poster
Jun 11, 2009, 11:06 AM
Post #3 of 7
(4374 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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Well I went to go buy a new ECT sensor since it's only about $15, and on the way back my truck just decided to quit working. Now I can hardly even idle and the truck just sputters and dies if I try to give it gas. This is making me lean more toward a fuel system issue... maybe a bad fuel pump? I'll end up having to take it to a shop though because I'm 2.5hrs away from home.
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azchevy
New User
Jun 11, 2009, 11:08 AM
Post #4 of 7
(4372 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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Hmm... I guess I wasn't logged in when I posted last.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2009, 11:09 AM
Post #5 of 7
(4370 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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The fuel pump is what I was leaning toward also but checking the fuel pressure is the first step. I don't think the temp sensor is going to do anything for you.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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azchevy
New User
Jun 11, 2009, 11:23 AM
Post #6 of 7
(4366 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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Ok, thank you for your advice. I wish I had my fuel pressure gauge up here, but I was going to wait to do that until I got back home tomorrow so I didn't have to pay someone to do it. Unfortunately it's looking like I don't have a choice now.
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azchevy
New User
Jun 11, 2009, 2:54 PM
Post #7 of 7
(4360 views)
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Re: 1999 Silverado - Intermittent lack of power after start
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So it ended up being the fuel pump. I'm just irritated that I have to pay someone to install it since I can't drive my truck over 150 miles home.
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