1989 Mustang LX No injector pulse - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 08-30-2009 Thread Starter
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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.
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post #2 of 10 (permalink) Old 08-30-2009
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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.

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347 in progress
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post #3 of 10 (permalink) Old 08-31-2009 Thread Starter
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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
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post #4 of 10 (permalink) Old 08-31-2009 Thread Starter
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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
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post #5 of 10 (permalink) Old 08-31-2009
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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.

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post #6 of 10 (permalink) Old 09-14-2009
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I had a similar problem, with no injector pulse, it was the eec relay.
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post #7 of 10 (permalink) Old 02-01-2011
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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. :?:
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post #8 of 10 (permalink) Old 02-01-2011
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Do you have 5v to the TPS?

When the green light drops...
The Bullsh!t stops. :shiny:
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post #9 of 10 (permalink) Old 02-01-2011
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Quote:
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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!
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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 ?
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