Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
09-30-2003, 02:55 PM | #1 | |
AF Newbie
Join Date: Sep 2003
Location: Los Angeles, California
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
|
5.7 Vortec Loss of Power Up Hill Final Straw
My Chevy Tahoe with a 5.7 Vortec looses power when going up hill and I get the usual Engine Miss Fire Code. Dealer completed a $100 diagnostic and recommends a $2000 valve job. I replaced plugs, fuel filter, plug wires, dist cap, and air filter. No change in performance and the check engine light still comes on going up hill. I took the advice of a poster who suggested cleaning off the mass air flow detecter with carb cleaner since I have a K & N filter. This improved performance, thanx for this info, but did not fix the problem. From all the posts regarding this problem, Tahoes, Burbs, Silverados,... etc, it seems to me that GM made a bad design. Everyone is being told that the valve guides need to be bored out. Not a simple job. Not a cheap job. Every dealer wants to charge upwards of $1500, and some people are getting GM to pay half. This is unacceptable. GM is responsible for selling a bad desing that needs fixing after normal use. I suggest contacting consumer reports and the Better Business Bureau to force GM to change the design to prevent this, and to fix the bad product they have already sold. Had I known about this design flaw, I would not have invested in this engine.
|
|
12-10-2003, 06:32 PM | #2 | |
AF Newbie
Join Date: Dec 2003
Location: San Jose, California
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
|
I believe brand new vortec heads are $500 each at the dealer, wouldn't hurt to check. I'd compare that to a valve job, I believe the new heads are complete with valves/guides/springs/keepers/locks/etc. and ready to go.
Most of that $2k is labor, it's definitely an all day job to swap heads and I've done it a few times.
__________________
'01 BMW 330i fuckin slow! '98 Infiniti QX4 stock as a rock '98 Tahoe 2dr 4WD sport X5 HID's, 265/75-16 BFG's, stock motor '93 Mustang LX coupe heads/cam/intake + stock 302 shortblock 11.95 @ 114 best so far all motor |
|
12-30-2003, 09:01 AM | #3 | |
AF Newbie
Join Date: Dec 2003
Location: dallas, Texas
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: 5.7 Vortec Loss of Power Up Hill Final Straw
to find if your valves are bad have compresion check performed if compresion is low have oil squirted into cylinder ifcompresion goes up its rings if it doesnt its valves if the compresion isntlow then you can rule out cylinder problems
|
|
10-24-2011, 01:39 PM | #4 | |
AF Newbie
Join Date: Oct 2011
Location: Morrisville, New York
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: 5.7 Vortec Loss of Power Up Hill Final Straw
sounds more like your poppets are sticking. Check fuel pressure should be 53-65 psi. Is it random misfire or specific cylinders. Had the same prob with mine. dealer gave me the same line and I converted mine to multiport for around 500.00$ and gained mpg and power.
|
|
10-25-2011, 12:18 PM | #5 | ||||
AF Enthusiast
Join Date: Jul 2005
Location: the Seasonally Frozen Wastelands
Posts: 884
Thanks: 12
Thanked 58 Times in 58 Posts
|
Re: 5.7 Vortec Loss of Power Up Hill Final Straw
Quote:
Everything wears out eventually. I know of some problems with the Vortec heads, but wiping the guides prematurely isn't one of them. Sure, it can happen. Not a common problem though. Quote:
Quote:
What's clear here is that a PROPER diagnosis has yet to be done--or--the original poster hasn't shared the complete results of that diagnosis.
__________________
. . For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory, released (intentionally or negligently) into the world in 2019 (VOWL-19). Ten trillion to start with, increasing as needed from there, PLUS compensation for the sickened, and "wrongful death" settlements for the families of those who didn't survive. END trade with Communist China. |
||||
10-25-2011, 06:01 PM | #6 | |
AF Fanatic
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
|
Re: 5.7 Vortec Loss of Power Up Hill Final Straw
I'm quite sure DUTCH has this problem corrected.
this post is 8 years old ///// LOL.... |
|
10-27-2011, 08:01 PM | #7 | |
AF Newbie
Join Date: Apr 2007
Location: Killeen, Texas
Posts: 28
Thanks: 0
Thanked 0 Times in 0 Posts
|
Re: 5.7 Vortec Loss of Power Up Hill Final Straw
The issue is some times not the valves. If you are having the problems i would check in to the spider injectors and the upper and lower intake
|
|
|
POST REPLY TO THIS THREAD |
Thread Tools | |
|
|