Go Back   Tahoe Forum - Chevy Tahoe Forum > 1994 - 1999 Chevrolet Tahoe/GMC Yukon Year Models > Technical Discussions

Welcome to the Tahoe Forum - Chevy Tahoe Forum.
Register to remove these ads.


Technical Discussions This forum is for technical discussions related to customizing your Tahoe/Yukon



Reply
 
Thread Tools Display Modes
Old 11-28-2008, 01:38 AM   #1
Sejo
Tahoeforum Apprentice Member
 
Join Date: Jan 2008
Posts: 22
Sejo is on a distinguished road
Default 99 Tahoe - Trouble Accelerating / Hesitation


Register to remove these ads. It's free!
Over the last month my 99 4WD Tahoe has been giving me problems
accelerating when I give it a heavy foot. When I hit the gas down it loses acceleration almost like it's
being starved of air or gas. When I hit the gas the engines just bogs down, begins to hesitate, and will not accelerate.

It'll drive ok if I'm light on the pedal; and the engine feels smoother than ever.

This morning I took it out on the interstate (after is sat overnight - cooled off) and ran it hard and it was MOVING - GREAT ACCELERATION. I left the truck running for an hour or so, driving around town and sitting idly in the drive way to let things warm up and I took it back out on the interstate. This time....the hesitation was back. Could my fuel pump be overheating? I changed it about 4 years ago. The symptoms only got worse after an 11 hour road trip. It got progressively worse over the last 4 hours of my trip. In the end I had to be light on the gas pedal to get it to speed; at speed it ran great, but if I had to accelerate for any reason (passing, inclines, etc.) it wouldn't GO! Just had to cruise.

Any ideas?
Sejo is offline   Reply With Quote
Old 11-28-2008, 08:07 AM   #2
mygreen98
Full Access Member
 
Join Date: Nov 2007
Posts: 298
mygreen98 is on a distinguished road
Default

fuel pump, or fuel pressure regulator.
mygreen98 is offline   Reply With Quote
Old 11-29-2008, 08:36 AM   #3
treepete
Full Access Member
 
treepete's Avatar
 
Join Date: Sep 2007
Location: Genesee Twp, WI
Posts: 1,302
treepete is on a distinguished road
Default

fuel pump
treepete is offline   Reply With Quote
Old 11-30-2008, 06:52 PM   #4
Sejo
Tahoeforum Apprentice Member
 
Join Date: Jan 2008
Posts: 22
Sejo is on a distinguished road
Default

What about if; when I slam the gas for it to go....it hesitates, the engine REVS up, but the truck doesn't move and starts to sputter?! Still the fuel pump?
Sejo is offline   Reply With Quote
Old 11-30-2008, 07:05 PM   #5
peterey2
Full Access Member
 
peterey2's Avatar
 
Join Date: Oct 2008
Posts: 196
peterey2 is on a distinguished road
Default

I'd say the fuel pump too. But i corrected a problem with symptoms jus like yours by simply replacing a fuel filter.
peterey2 is offline   Reply With Quote
Old 11-30-2008, 08:35 PM   #6
Sepiroth
Spam Executioner
 
Sepiroth's Avatar
 
Join Date: Jun 2008
Location: Kouts Indiana
Age: 37
Posts: 960
Sepiroth is on a distinguished road
Default

Have your fuel pressure and fuel volume checked. Your pump is to be pushing 58-62psi. It does read as if your pump is starting to give up the ghost
Sepiroth is offline   Reply With Quote
Old 12-02-2008, 03:49 PM   #7
Sejo
Tahoeforum Apprentice Member
 
Join Date: Jan 2008
Posts: 22
Sejo is on a distinguished road
Default

So I finally had to get back home.

I checked the fuel pressure. The fuel pressure at engine idle was about 55psi, and at high revs it's 60psi. I ran the truck with the gauge attached and it ran at 60psi - 55psi when coming to a stop. Whenever I encountered the problem I was having on the interstate the pressure dropped to 50psi. Fuel Pump?

I went and had the Cats checked out. The guy said they seemed ok other than a MASSIVE leak coming from their weld (replacement cats); he fixed that weld along with replacing the O2 Sensors (all 4). Thru in some complete fuel system cleaner. Also changed the fuel pump with a Bosch one from Advance Autoparts with lifetime warranty and the truck is not hesitating any more.

Could I have patched the problem temporarily, or did I fix it? The O2 sensors that were in there were the originals so I am sure they weren't helping the problem. The cats are about 2 or 3 years old. The entire exhaust system is cr@p, so I'll have to save up for a nice catback exhaust with headers.

I drove it home 11 hours 75-80MPH, stopping only to refuel, and no hesitations. I'd call it good. It was the smoothest ride I had ever had in the Tahoe.
Sejo is offline   Reply With Quote
Old 12-02-2008, 04:36 PM   #8
mygreen98
Full Access Member
 
Join Date: Nov 2007
Posts: 298
mygreen98 is on a distinguished road
Default

probably lazy fuel pump. they stink in these vehicles !!!!!!!!!!!!!!!!!
mygreen98 is offline   Reply With Quote
Old 12-02-2008, 04:46 PM   #9
Sejo
Tahoeforum Apprentice Member
 
Join Date: Jan 2008
Posts: 22
Sejo is on a distinguished road
Default

Quote:
Originally Posted by mygreen98 View Post
probably lazy fuel pump. they stink in these vehicles !!!!!!!!!!!!!!!!!
That is for sure!! This is my 2nd one already. I had to replace it in '05; I think it failed prematurely. Lifetime warranty now.

I do run the Tahoe hard on long trips and around down; bound to happen I guess.
Sejo is offline   Reply With Quote
Old 12-02-2008, 09:02 PM   #10
PotentialTahoe
Full Access Member
 
Join Date: May 2008
Posts: 52
PotentialTahoe is on a distinguished road
Default


Register to remove these ads. It's free!
I too have a similar problem. My rpm and mph gauges will go out when driving and the accelerating feels very sluggish. But when the rpm and mph gauges are working, it runs as it should, very powerful good accelaration.
PotentialTahoe is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



 
Advertisement

Other Sponsors






All times are GMT -4. The time now is 03:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All rights reserved and copyrighted
Fully Driven Auto Network
GM Truck Forum
Ford Raptor Forum
Dodge Ram Forum
Chevy Cobalt Forum
Chevy Camaro Forum
FJ Cruiser Forum
Ford Truck Forum
88-98 GM Truck Forum
73-87 Gm Truck Forum
Ford Expedition Forum
Chevy Equinox Forum
Chevy Cruze Forum
Jeep Liberty Forum
Jeep Forum
Dodge Ram SRT10 Forum
Chrysler 200 Forum
Scion xD Forum
Scion xB Forum
Dodge Challenger Forum
SRT Forum
Nissan Titan Forum
Buick Enclave Forum
Cadillac Forum
Cadillac XTS Forum
TRD Forum
Central US Mopars
Southeast Mopars
Cadillac CTS Forum
Oklahoma Dodge Ram Club
Softball Forum