Question about 1984 Pontiac Fiero

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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 injector on. I also tested the wires from the harness to the injectors and the one has power and the other one doesnt, the other ones also not a ground.

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  • Pontiac Master
  • 6,826 Answers

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.

Posted on Nov 12, 2009

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2 Answers

Why my fiero wont run


The injectors need to be tested for pulses between the two wires (not to ground or +12) with the engine turning. With it still, you will get almost the same reading (only noticeable if you use a meer) from both wires since the injector has a coil of wire between the two terminals. The electronics may float between ground or +12 on the wires depending if they are powered up or not.

Do you have the appropriate pressure at the fuel rail? A V6 takes a lot more pressure than the 4 cylinder cars.

Aug 16, 2014 | 1985 Pontiac Fiero

1 Answer

I have a 84 Buick T-Type it's getting fire an it gets gas up to fuel rail but I don't think the injectors are spraying


Have you checked the injector circuits with a test light to see if you have voltage and a pulse ground from the computer ?
Can you spray carb cleaner into the intake to make it try to start ?

Feb 20, 2013 | 1984 Buick Regal

2 Answers

84 pontiac fiero injector want spray on crank up


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

Mar 11, 2011 | 1984 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

Replaced multi port injectors,new timeing chain


Ensure the battery cable are not damaged and are tightly connected. Sometimes the cable ends become loose due to corrosion and wear thin.
Also try replacing the Mass Air Flow Sensor, it's the switch looking thing, to the right of the air filter box; I think it runs about $6-$10s. Good luck.

Dec 23, 2009 | 2000 GMC Jimmy

1 Answer

I got a 85 firebird 2.8 multi port it wont start when its cold have to spray gas right in the intake but once its started it will start right up


ck cold start injector should have power when key is turned to start position for maybe a second or two if you have power probably a bad cold start injector no power try fuse or look at wiring diagram trace wire

Dec 22, 2009 | 1985 Pontiac Firebird

1 Answer

My 1992 4. liter wont start in the morning. It starts and runs fine all day after the first start. Starting fluid worked but doesn`t any more


check the temperature sending unit and the manifold air temp sensor. Can also be related to a bad pump ballast resistor (on fender near master cyl.) as you have already figured out, is is a fuel problem. but fuel system injectors are triggered by computer that takes info from everywhere. Time to break out the manual and the multi meter and do some testing...Start with what I recommended though.

Oct 13, 2009 | 1992 Jeep Cherokee Sport

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

1 Answer

Intermittent Misfire on cyl #4 1997 Buick Lesabre


How's your coolant level? The intake manifolds on the 3.8L engines are prone to breakage at various locations causing coolant leaks into the crankcase and vacuum leaks on intake ports.Removal of the upper intake manifold will be necessary for inspection. Also, check for vacuum leaks at various locations on the outside of the intake manifold using WD-40 or brakeclean/carburetor cleaner sprayed hoses, non-electrical components, at the base of the manifold etc. As for a faulty injector, not likely but if you suspect one you can always swap the suspect injector with another on the engine and see if the misfire follows the injector. Just be sure to relieve the fuel pressure before servicing. Hope this helps.

Jan 23, 2009 | 1997 Buick LeSabre

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