Question about 1984 Pontiac Fiero

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84 pontiac fiero injector want spray on crank up

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Where does the injectors get there pulse signal from on a pulse1986 pontiac fiero gt ..and where is it located.

Posted on Jul 20, 2014

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What have you done to correct the problem?
have you check for voltage at the injector?
Do you have fuel psi at the rail before and after the fusl regulator?
Lee Davidian

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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1 Answer

1986 pontiac fiero valve cover torque specs?


Six to eight foot-lbs (72 to 84 inch-lbs)

Feb 21, 2013 | 1986 Pontiac Fiero

1 Answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors


Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.

Mar 20, 2011 | 1986 Pontiac Fiero

1 Answer

Engine will pump gas to start the engine but as soon as it started it would start pumping gas? i have a 84 thats doing it


The 84 was the first year of production and tended to have some problems. You can go to
www.fierostore.com
for fiero specialists and parts.
Hope this helps!!

Nov 17, 2010 | 1986 Pontiac Fiero

1 Answer

Do you know plug wire line up for a 1995 pontiac fiero 2.3


The Pontiac Fiero was made from 1984 to 1988
In the 84 thru 88 Fiero's they had the 2.5L In-Line 4-Cylinder or the 2.8L V6.
I have included both below

For the 2.5L In-Line 4-Cylinder:
Firing Order:
1 - 3 - 4 - 2
Cylinders:
.........(back)............
|...1....2....3....4...|
.........(front)
Distributor Connections:
..............2
...................(+)
....4
....................1
(+)
..........3

For the 2.8L V6:
Firing Order:
1 - 2 - 3 - 4 - 5 - 6
Cylinders
.......(back).........
|...1.....3.....5...|
|......................|
|...2.....4.....6...|
........(front)
Distributor:
............2
......1.........3
(+)...............(+)
......6.........4
............5

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Jul 09, 2010 | 1985 Pontiac Fiero

1 Answer

Where does the OBD reader plug into in the 88 Fiero? Need to run codes to see why ck engine light intermittingly goes on and off...


On my 84 I had many years ago, I had to remove the panel right behind (rear of )the shifter. If I remember the cigaette lighter was there as well.
How is the Fiero running?
I still wish I had mine, but kids got in the way, and the high price of replacement parts.

Jan 05, 2010 | 1988 Pontiac Fiero

1 Answer

I have a 84 potiac fiero 4 cyl and the multi port injector wont spray when trying to start. I tested it with two wires to the batery and it works, but the wires coming out of the harness wont turn the...


Be careful putting 12 volts to the injector harness,it will burn the e c m out.The module in the distributor,and the pickup coil work together to pulse the injector and energize the coil.The ignition module is most likely the problem,but the pickup coil in the distributor,would be my second choice in the two.See if it has spark,or spray a little bit of starting fluid in the intake,not much,if it fires,and tries to run,replace the module,and the pickup coil.If it has no spark,the module replacement will be all that is needed.

Nov 12, 2009 | 1984 Pontiac Fiero

2 Answers

Too much fuel pumped into the carb. What to do?...adjust?...set?


The idle air control valve may be at fault, also the throttle position sensor may be telling the engine th wrong information and sending too much fuel, a couple other ideas come to mind but I not an expert. A faulty injector is one of them.....I another idea that may help as well: Vacuum Leak: The ECM will try to compensate for leaks up to a certain size. This will cause the ECM to compensate and possible send too much fuel to the engine...???? Good Luck

Mar 15, 2009 | 1986 Pontiac Fiero

1 Answer

1987 pontiac fiero 4 cyl does not start, over fueling


its most likely the cpu fuel management this could cause the car to be running to rich

Mar 02, 2009 | 1986 Pontiac Fiero

2 Answers

1988 Pont Fiero won't start


are you friggin kidding me, nobody has replide to such a friggin stupid *** question.... that is so basic please call me and i will fix it over the phone......562-503-5134 isaac

Jul 24, 2008 | 1988 Pontiac Fiero

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