Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 5.0L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

5.0 Mustangs Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 08-30-2009   #1 (permalink)
Over-rev is offline Rookie


Joined: Aug 2009
Posts: 5 Threads: 1
 Over-rev's Country Flag
Napa   California
Over-rev is on a distinguished road
Default 1989 Mustang LX No injector pulse

Im haveing a hella of a time tryn to sort this problem out.

Just dropped ina new engine harness and computer, I am getting spark and Fuel press, Just no injector pulse.

Im almost running outta Idea's, I have 2.5 volts to my TPS .

It shows 4 volts at the red wire in the salt and pepper connectors on the intake and also shows the same 4volts at the ecc relay? When I jump the Diagnostic port(upper R hand corner tan/grn wire) I get the full 12 volts? jumped from Battery positive.

Ive been dealing with Foxbody for 13yrs and never seen this before, I am sure glad I found this site and look forward to Staying.
Over-rev is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 08-30-2009   #2 (permalink)
89coupe is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2008
Posts: 5,257 Threads: 6
 89coupe's Country Flag
Cartersville   Georgia
89coupe is on a distinguished road
Default

Have you checked the ECM grounds?

Also the Tan/Light Green wire you jumped to positive, is the the Fuel Pump trigger, and its a cycled GROUND. And shouldnt be jumped to positive. Its possible you shorted something out in the ECM ground circuit, and could explain the the Low Voltage to the Injectors.
__________________
89 Coupe
347 in progress
89coupe is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 08-31-2009   #3 (permalink)
Over-rev is offline Rookie


Joined: Aug 2009
Posts: 5 Threads: 1
 Over-rev's Country Flag
Napa   California
Over-rev is on a distinguished road
Default

Quote:
Originally Posted by 89coupe View Post
Have you checked the ECM grounds?

Also the Tan/Light Green wire you jumped to positive, is the the Fuel Pump trigger, and its a cycled GROUND. And shouldnt be jumped to positive. Its possible you shorted something out in the ECM ground circuit, and could explain the the Low Voltage to the Injectors.

Thats Odd because before I even jumped the Fuel pump trigger I had 4vlts at Both? I have checked and re-checked ecm grounds and all fuseable links to the ecm.
__________________
1999 SALEEN SC281 #124 ,5.1,HP twin turbo
1989 SALEEN # 071 347,AFR's,Vortec after-cooled
1998 Nascar Edition F150-Roush prototype
1993 Nissan Silvia LS2,Jerico 4spd, D1/FD spec
Over-rev is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 08-31-2009   #4 (permalink)
Over-rev is offline Rookie


Joined: Aug 2009
Posts: 5 Threads: 1
 Over-rev's Country Flag
Napa   California
Over-rev is on a distinguished road
Default

I should have noted this earlier also , I do not have a Fuel pupm sig also. When I do jump the DIA port I still dont have a fuel pump, I can jump it at the relay and it will power up the pump. Thanx 89 coupe
__________________
1999 SALEEN SC281 #124 ,5.1,HP twin turbo
1989 SALEEN # 071 347,AFR's,Vortec after-cooled
1998 Nascar Edition F150-Roush prototype
1993 Nissan Silvia LS2,Jerico 4spd, D1/FD spec
Over-rev is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 08-31-2009   #5 (permalink)
89coupe is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2008
Posts: 5,257 Threads: 6
 89coupe's Country Flag
Cartersville   Georgia
89coupe is on a distinguished road
Default

Ok, you have 4v's at the Black/Orange wire at the EEC relay?

If so. Take a voltage measurement from that same wire at the Starter solenoid. If its 12v's then You have a bad KAMPWR circuit. You could do an OHM test on both ends of this wire. One side starter solenoid(wire unhooked from solenoid) other side PIN 1 at the ECM (ECM also disconnected). Should be 0-5 ohms.

Also check the #1 PIN connection for good measure. This is where everything ECM related starts voltage wise. So it be the first place to look if all grounds are good.

Dumb question, but is the battery voltage good? You know.....Just in case.
__________________
89 Coupe
347 in progress
89coupe is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 09-14-2009   #6 (permalink)
nev30 is offline Rookie

5.0L Member


Joined: Aug 2009
Posts: 25 Threads: 3
 nev30's Country Flag
Melbourne   Florida
nev30 is on a distinguished road
Default

I had a similar problem, with no injector pulse, it was the eec relay.
nev30 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 02-01-2011   #7 (permalink)
89FordCoupeLX is offline Rookie


Joined: Jan 2011
Posts: 32 Threads: 5
 89FordCoupeLX's Country Flag  View 89FordCoupeLX's 5 photos
San Fernando Valley   California
89FordCoupeLX is on a distinguished road
Default

Quote:
Originally Posted by nev30 View Post
I had a similar problem, with no injector pulse, it was the eec relay.

I'm having the Same problem with My '89 Coupe LX, this minute!
And, I even went and bought a new EEC Relay today at Auto Zone and changed it out, and my Pony still will Not Start Freely.

Any other suggestions I can try ??? I'm out of options. :?:
89FordCoupeLX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 02-01-2011   #8 (permalink)
spdjnky_42 is offline Top Dog

5.0L Member


Joined: Nov 2007
Posts: 13,639 Threads: 204
 spdjnky_42's Country Flag  View spdjnky_42's 21 photos
St.Louis   Missouri
spdjnky_42 is on a distinguished road
Send a message via Yahoo to spdjnky_42
Default

Do you have 5v to the TPS?
__________________
When the green light drops...
The Bullsh!t stops. :shiny:
spdjnky_42 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 02-01-2011   #9 (permalink)
89FordCoupeLX is offline Rookie


Joined: Jan 2011
Posts: 32 Threads: 5
 89FordCoupeLX's Country Flag  View 89FordCoupeLX's 5 photos
San Fernando Valley   California
89FordCoupeLX is on a distinguished road
Default

Quote:
Originally Posted by spdjnky_42 View Post
Do you have 5v to the TPS?
Thanks, I'll check that out.

I was reading up on the TPS and saw that it has something to do with the amount of voltage or reading that the computer gets, sending the proper amount of air and fuel mixture into the engine.

So, that could definitely be an option as to why my car sounds like it wants to turn over but still won't?

I've tried lots of things, the TPS was not one of them, but seems as though I'm putting money into the wrong places.

Thanks for the help!
89FordCoupeLX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 02-02-2011   #10 (permalink)
89FordCoupeLX is offline Rookie


Joined: Jan 2011
Posts: 32 Threads: 5
 89FordCoupeLX's Country Flag  View 89FordCoupeLX's 5 photos
San Fernando Valley   California
89FordCoupeLX is on a distinguished road
Any Suggestions? Tps

Quote:
Originally Posted by spdjnky_42 View Post
Do you have 5v to the TPS?

Quick question...
Have any idea where the Throttle Position Sensor (TPS) is on a 2.3L Pony Motor??

I've looked and can't spot it.
I know on the 5.0's, it's on the top of the throttle body, right?

But, where is it on the 2.3L ?
89FordCoupeLX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

Search Engine Friendly URLs by vBSEO 3.5.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164