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2.3L Ford from 1990 Tempo
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jethro
Novice
Mar 22, 2012, 12:44 AM
Post #1 of 14
(2851 views)
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2.3L Ford from 1990 Tempo
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Symptoms:
Takes multiple attempts to start, not firing, sputering once or twice then finally catching on and running fine for a few seconds then will die if throttle not bumped every few sec until it warms a bit. Holding key slightly on seems to help.(ie not fully releasing after starter engagement)
Will die when put in gear if not massaged. Once on road, will accelerate slowly to about 55-60 w light throttle application. If too much, dies. Releasing throttle and lightly depressing will usually cause it to resume running.
Actions:
Fuel pump relay works(can hear, feel it clicking) tried a new one, same result.
Fuel pump energizes for a sec.
Fuel pressure at rail sometimes zero, sometimes 12 psi, sometimes 24-25. Seems no rhyme or reason as to what reading.
Fuel presssure regulator replaced and helped slightly - accelerates a little better when it does run, but still dies if throttle pushed more than slightly.
Voltage at fuel pump is 7.06. Momentarily reads 12v when key on or starter engaged(about 1 sec) then goes and stays at 7(voltage taken from connector while not connected to pump.
Fuel pump "looks" ok....for what that is worth. Have a new pump but not installed yet as am doubtful it will fix problem. Esp after discovering only 7volts at the pump connector. Incidentally, I connected the plug back to fuel pump assembly(still installed in tank) and turned key on to see what happened...expected fuel to shoot out of pipe and got nothing.
Bottom line: Whether or not the pump sends fuel is unpredictable. Pressure seems low, and never starts on first attempt. Car barely driveable, and only w much finesse and gimmickery.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 22, 2012, 3:24 AM
Post #2 of 14
(2813 views)
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Re: 2.3L Ford from 1990 Tempo
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You already know you have a fuel pressure problem to get to the bottom of. If you are questioning the power supply arriving at the pump, then simply apply 12v from another source for testing purposes.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jethro
Novice
Mar 22, 2012, 8:12 AM
Post #3 of 14
(2790 views)
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Re: 2.3L Ford from 1990 Tempo
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I just wasnt sure if pump should have 12v continuous or if the drop to 7v at the pump connection was correct. If the voltage drops to 7 to protect the pump for extended operation, I didn't want to bypass and burn it up.
I will go put a 12v supply directly to the pump and see what happens.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 22, 2012, 8:38 AM
Post #4 of 14
(2788 views)
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Re: 2.3L Ford from 1990 Tempo
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That wouldn't protect the pump, it would harm it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jethro
Novice
Mar 22, 2012, 10:02 AM
Post #6 of 14
(2768 views)
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Re: 2.3L Ford from 1990 Tempo
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Connected 12v directly to pump and it runs and sounds good. I know this is barnyard, but checked the pressure with a tire pressure guage - multiple times, consistently got 19psi. Seems way low for a pressure reading at the outlet.
Also checked voltage at connector using a different ground and again got battery voltage for 1 sec w/key on, then 7v. If starter engaged, same cycle. This baffles me b/c I think it should be 12v steady. I read other accounts of the same voltage drop for Fords. I would like to be sure the power is correct before installing a new fuel pump that doesnt fix the problem. I thought using a direct ground might change the reading but doesnt. The 7v reading is also strange b/c it seems EEC voltage feeds are 5v. The fuel relay I swapped was the outboard one behind glove box. Not really sure what to do next.
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speed
User
Mar 22, 2012, 11:00 AM
Post #7 of 14
(2734 views)
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Re: 2.3L Ford from 1990 Tempo
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As DS stated you have excessive ressistance in your feed wire somewhere. Ypu need to trace your power wire to the relay and see if there is anything thats causing resistance
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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jethro
Novice
Mar 22, 2012, 11:21 AM
Post #9 of 14
(2725 views)
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Re: 2.3L Ford from 1990 Tempo
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Ok then - Going to check the pwr feed wire now. Thanks
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jethro
Novice
Mar 22, 2012, 11:25 AM
Post #10 of 14
(2724 views)
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Re: 2.3L Ford from 1990 Tempo
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I know...I know. But Hey, it worked. Its a direct reading guage and seems to give instant, exact readings.
The "professional" fuel pressure reading set I used the prev three times seems to lag and give vague readings - like there is too much flex/bleed in the excessively long line to the pressure guage.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 22, 2012, 11:45 AM
Post #11 of 14
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Re: 2.3L Ford from 1990 Tempo
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Here is the spec and that's non-negotiable.
Key ON Engine OFF 50 - 60 psi (345 - 415 kPa)
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jethro
Novice
Mar 29, 2012, 4:41 PM
Post #12 of 14
(2640 views)
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Re: 2.3L Ford from 1990 Tempo
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Problem solved: There is a flexible fuel line connecting the fuel pump to the metal fuel pipe going out of the tank. This line had deteriorated and a leak developed between the inner and outer sleeves of the fuel line where the nylon reinforcement braiding is. This allowed fuel out of the pump to be ported back into the tank - hence the inconsistent and insufficient fuel pressures. A replacement piece of fuel line solved it. I also replaced the fuel pressure regulator as this seemed to help it run smoother, and respond to throttle inputs better.
I still dont know why voltage drops from 12v to 7v after a moment, but car starts and runs properly now. I read on another blog where this occurs in other cars too, for example the Mustang.
Thanks Hammer and all for the inputs.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 29, 2012, 4:46 PM
Post #13 of 14
(2637 views)
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Re: 2.3L Ford from 1990 Tempo
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Real late model Fords use a Pulse Width Modulated feed from a module to vary the pressure but not yours. Yours is likely dropping because the pump is consuming too much current or you have too much resistance in the circuit somewhere. It's supposed to receive battery voltage at all times.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jethro
Novice
Mar 29, 2012, 4:53 PM
Post #14 of 14
(2631 views)
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Re: 2.3L Ford from 1990 Tempo
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The circuit was open when I was measuring voltage(unplugged and reading off the contacts)...maybe thats why.
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