1990 mustang lx 5.0 - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT

Join Mustang Evolution Today

Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 10-06-2015, 11:02 PM   #1
Registered Member
Join Date: Sep 2014
Location: Odessa
Region: Texas
Posts: 20
1990 mustang lx 5.0

I changed the fuel pump and car was running good. today I started bogging or misfiring
I changed the plugs and wires and it still does it
I Boggs until it dies I press on the gas and all it does is die
Any ideas on what to do?

Sent from my iPhone using Mustang Evolution

Josueb8 is offline   Reply With Quote
Old 10-07-2015, 08:06 AM   #2
Registered Member
smurf stang's Avatar
Join Date: Mar 2014
Location: Miami
Region: Florida
Posts: 1,279
Don't know much about your car, what it has, what has been done to it.

Start by running your codes.

2016 VW GTI 2.0 Turbo

1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
smurf stang is offline   Reply With Quote
Old 10-07-2015, 10:42 AM   #3
Registered Member
Join Date: Sep 2014
Location: Odessa
Region: Texas
Posts: 20
That I know of just .30 over

Sent from my iPhone using Mustang Evolution
Josueb8 is offline   Reply With Quote
Old 10-09-2015, 09:28 PM   #4
Registered Member
wbrockstar's Avatar
Join Date: Mar 2015
Location: Nashville
Region: Tennessee
Posts: 273
Are you 150% sure you tightened the hose clamp fully on the hose that goes between the pump & fuel pump pickup assembly??Were you having similar issues before you replaced the pump or did the issues begin only after you installed the pump??There must have been a reason for you to change the pump,unless you were just replacing it to upgrade to a higher flowing unit.One thing you can do is test it while the dieing condition is occurring.Remove the breather tube(between oil filler neck & throttle body)from the throttle body,spray carb cleaner or starting fluid into that breather tube nipple on the throttle body,reinstall the tube,try to start the engine.If it starts & runs for a few seconds then dies,you've got a no fuel problem.If it doesn't start at all,you've got a no spark problem.You need to check the fuel pressure regulator and check fuel pressure.Let the car idle while you remove the vacuum hose from the fpr.If fuel is seeping from the regulator vacuum port or fuel is present in the hose,the regulator is bad.Check fuel pressure.AUTOZONE rents fuel pressure test kits for a small refundable deposit.Pressure should read 30-45psi with the key on/engine off,30-40 with engine running.Now turn the engine off & take a reading.Wait 5 minutes and take another reading.Did pressure drop more than 5psi in a 60 second period??If yes,the fpr is defective,the fuel pump hose (I mentioned earlier)is leaking or an injector is leaking internally.
I would also inspect your fuel lines from the tank to the fuel filter,to make sure none of them got pinched when you raised the tank back into place.Did you reattach the vacuum hose to the vapor valve on top of the fuel tank??If not,the tank could be collapsing & stopping fuel flow to the engine.The purge valve draws vapors from the tank through that vacuum hose.You can also try pulling codes just in case any are present,due to the misfiring and stalling condition.All you need is a jumper wire & a functional check engine light.
BTW-the check engine light doesn't have to be on in order for codes to be present,so run the koeo koer scans.
D.S.S. 331 10.5:1
Trick Flow Top End
XE276HR 0.544/0.544
80mm maf/70mm tb
1 5/8" Longtubes
Cat Hpipe/2 Chamber FM
wbrockstar is offline   Reply With Quote

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT

1990 mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mustang :: 1990 Ford Mustang crroy71 Member Garages 0 03-17-2014 05:40 AM
Can u put a 1993 ford mustang starter in a 1990 mustang? sydeek 1979-1995 Mustang GT 4 12-16-2011 10:14 PM
Mustang GT Cobra :: 1990 Ford Mustang GT Cobra mustangcobra90 Member Garages 0 07-23-2011 09:14 AM
1994-1998 3.8 Mustang parts on 1990 3.8 tbird Jay Pre-2005 V6 Mustang 0 11-01-2003 02:35 PM

» Like Us On Facebook

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

06:32 AM

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.