The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 99-06 GMT800 Chevy and GMC Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-27-2015, 08:03 AM   #1
J Shepardson
Registered User
 
Join Date: Mar 2003
Location: S. Pa
Posts: 30
03 blazer 4.3 fuel pressure

Hi guys, I just ran a fuel pressure test/leak down and was hoping I could get some thoughts on my readings.
This is what I got:

Key on @ 58 psi, after the key is on for 3 seconds it drops down to 53 and remains constent, no further drop

Idle @ 50

reving the engine @ 48~58

holding the throttle at 2k (the max it will go) @ 58

Then engine off @ 46 (will hold without loss)

These numbers seem kinda low to me, any thoughts?
Thank you

(This is a repost, believe I originally posted this in the wrong sub forum)
J Shepardson is offline   Reply With Quote
Old 07-27-2015, 08:35 AM   #2
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
Re: 03 blazer 4.3 fuel pressure

Keeping in mind we may have variation in gauge calibration I see no cause for concern. Is there a certain problem you're going after?
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 07-27-2015, 11:21 AM   #3
J Shepardson
Registered User
 
Join Date: Mar 2003
Location: S. Pa
Posts: 30
Re: 03 blazer 4.3 fuel pressure

She's been spitting, sputtering and stuttering. I've had her for 5 years and there has always been an idle miss, recently it's been getting worse, now she's really carrying on when driving. I just started getting a solid ses light which is now blinking, it's coming up as a random misfire. I've changed the plugs, cap, rotor, fixed the vacuum leaks and checked the maf. Nothing seems to be making a difference. She seems to run fine cold, but after she gets up to temperature she throws a tantrum. Other than testing the fuel and knock sensor (which I haven't done yet) I'm at a loss.
J Shepardson is offline   Reply With Quote
Old 07-29-2015, 11:11 AM   #4
68C15
blood type; Retumbo
 
68C15's Avatar
 
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
Re: 03 blazer 4.3 fuel pressure

It may be time to take it to a shop
__________________
Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
68C15 is offline   Reply With Quote
Old 07-29-2015, 12:07 PM   #5
ironroad9c1
Master Hater
 
Join Date: Apr 2006
Location: Temple,Tx.
Posts: 402
Re: 03 blazer 4.3 fuel pressure

these things are bad for chewing up dist gears and just dist in general going bad I got a metal replacement from skip white on ebay for my ex wifes 2002 ZR2
__________________
1997 C1500 ECSB 4.3/NV3500 8.5 3.42
"This evening, all of you bleeding hearts... why don't just go ahead and hug yourself for the next 20 minutes or so, because there's a really good chance you're gonna be offended".- Captain Owen Honors
ironroad9c1 is offline   Reply With Quote
Old 07-30-2015, 08:23 PM   #6
J Shepardson
Registered User
 
Join Date: Mar 2003
Location: S. Pa
Posts: 30
Re: 03 blazer 4.3 fuel pressure

I'll double check that distributor for play this weekend
J Shepardson is offline   Reply With Quote
Reply

Bookmarks

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


All times are GMT -4. The time now is 08:19 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com