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1985 Pontiac Fiero injector will not spray

Tiny
MORPHEW
  • MEMBER
  • 1985 PONTIAC FIERO
  • 4 CYL
  • 2WD
  • MANUAL
  • 33,000 MILES
Fuel injector will not spray. I am getting fuel up to the throttle body. Put a new injector in the Sat.
Car will fire and run with starting fluid, but will not stay running. I can see that the fuel is not being sprayed into the fuel bowl. Not sure if this matters but the fan belt broke, shut the car off replaced belt and now the car will not run. Did check all fuses, and there are no codes from the ECM.

HELP!
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Monday, March 24th, 2008 AT 12:04 PM

10 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Are you sure you are getting enough fuel to the fuel bowl? The belt shouldn't have anything to do with it.
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Monday, March 24th, 2008 AT 12:30 PM
Tiny
MORPHEW
  • MEMBER
  • 3 POSTS
I am pretty sure I am getting enough fuel. Fuel filter is full, I took it off and flushed it. When I replaced the injector, I had to break the seal on the fuel meter it was full also.
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Monday, March 24th, 2008 AT 1:06 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Sorry I miss read what you wrote. I would check and see if you have injector pulse at the injector. If you can obtain a set of noid lights, connect one to the injector connector and see if they flash when you crank the car over. You can try to take a test light and put it between the two terminals on the injector connector. It should do the same thing. Let me know what you find out. I will help you as much as I can
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Monday, March 24th, 2008 AT 1:15 PM
Tiny
MORPHEW
  • MEMBER
  • 3 POSTS
I will get a noid light, tried to use a multimeter couldnt really tell anything. What if it isnt getting any pulse. I am kind of at the end of my rope. The funny thing is it was running when I shut it off.
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Monday, March 24th, 2008 AT 1:23 PM
Tiny
DUMAC
  • MEMBER
  • 1 POST
My Fiero did something like that. Went out one day and just wouldn't start. My mechanic replaced the ignition module and pick up coil and it fixed it. Couple hundred bucks but cheaper than a new car
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Friday, October 26th, 2018 AT 7:17 PM
Tiny
JASPERJJ
  • MEMBER
  • 1 POST
  • 1984 PONTIAC FIERO
  • 185,433 MILES
There is no electrical pulse to the throttle body injector
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Friday, October 26th, 2018 AT 7:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Make sure there is 12 volts to the injector on the one side. The other side is pulsed by the computer. In most cases, the distributor pick up coil sends the signal to the ecm for firing the injectors. Have it checked to verify.

Roy
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Friday, October 26th, 2018 AT 7:17 PM (Merged)
Tiny
LOONATIK
  • MEMBER
  • 1 POST
  • 1988 PONTIAC FIERO
  • 4 CYL
  • 2WD
  • MANUAL
  • 125,216 MILES
I was drivin my fiero and it died. At first I thought it didnt have gas. But when I put gas it still didnt want to inject fuel. The fuel pump work. At first thought that the filter was cloged up. So I changed it. Then the injector squirted a little bit of fuel. Then I thought the injector was cloged up to so I change it and when I did the injector squirts a lot of fuel and chokes the engine. Do you kno wats the problem?
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Friday, October 26th, 2018 AT 7:18 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check fuel pressure with a mechanical gauge, should be about 13psi on a TBI engine.

The injector could also be bad.
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Friday, October 26th, 2018 AT 7:18 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Replace the oil pressure sender, this engine uses the OP sender circuit as a backup. If OP sender is bad, it will shut off pump.
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Friday, October 26th, 2018 AT 7:18 PM (Merged)

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