Question about 1986 Pontiac Fiero

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1986 Pontiac Fiero V6 2.8L rebuilt..I started it up, within 45 seconds the exhaust manifolds turn bright red and start burning up. I triple checked the timing, it is idling a bit higher than normal still. I've swapped injectors, replaced them...I did removed the Catalytic converter, it's over 20yrs old and I don't need it... any thoughts? It's got fresh fluids, motor is great, starts right up, but the manifolds glow within 45 secs.

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That is usually from a clogged catalytic convertor and/or the pre-cat or collector that sits in between the manifold and the cat. If you left the pre-cat on, remove it and see what the result is.

Posted on Jun 03, 2010

  • Sexy928S4
    Sexy928S4 Jun 03, 2010

    As soon as I get home I'll check it out. Didn't even think of it! Female here!!! lol.

  • Sexy928S4
    Sexy928S4 Jun 03, 2010

    OK home...quite quick.. this motor does not have a pre-cat collector...turns out the newer 2.8L have this, I have a 1986. Thanks for your solution though :)

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You can also check to make sure substrate from the converter didn't blow into the muffler and plug it.

Posted on Aug 19, 2010

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SOURCE: o2 sensor location 1997 pontiac grand am 2.4 4 cyl auto trans

BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.

P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.

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SOURCE: 1987 pontiac fiero starting problem

the ignition control module goes bad as well. when it goes bad, things like this happen too often in these cars. my car had the same problem. and it didnt work right til i changed the ignition control module which is inside the pick up coil

Posted on Jan 01, 2010

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1 Answer

Why the exhaust manifold turn on red?


Ok I beleive your asking why your exhaust manifold is turning red. If this is the case you probably have a blockage in your manifold, or the cat is clogged. somewhere the is an obstruction not allowing the exhaust gasses to escape properly and the temperature just keeps raising. You need to fix this right away! If I were you I would take the exhaust apart and clean it, or just replace it, then take off the manifolds and clean them out, if you do not find the obstruction then the cat is clogged and needs replaced!

Oct 12, 2012 | 1986 Pontiac Fiero

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Check fuel pressure, ignition spark, and compression and report findings.

Aug 04, 2012 | 1986 Pontiac Fiero

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Is it normal for v6 fieros exhaust manifolds to glow red at night


Yes, they are made of a very thin steel, so watch for cracks in them.

When the time comes, here is a good source for parts:

http://www.fierostore.com

Hope this helps.

Oct 10, 2010 | 1986 Pontiac Fiero

1 Answer

FIERO GT V6 THE MANIFOKL IS GETING RED AFTER START THE ENGINE, WHAT I HAVE TO DO?


That is usually caused by a plugged exhaust system. Either the converter / pre-converter or muffler is plugged. Also check to make sure EGR valve is working properly

Jun 23, 2010 | 1986 Pontiac Fiero

1 Answer

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Make sure the spark plug wires are on right (propper firing order), and check the TPS sensor. Are there any exhaust leaks or vacuum leaks? Did you use the original intake manifolds and Holley throttle body? If not you need to replace the PROM chip with the one from the donor car.

Sep 20, 2009 | 1986 Pontiac Fiero

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If it is coming from your motor...you should be looking for a new motor or a good garage to have that motor rebuilt.

Mar 05, 2009 | 1986 Pontiac Fiero

1 Answer

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The thermostat is held in place by a rubber seal around it and the access cap. One of those is allowing the thermostat to move freely.

The bright red manifolds indicate that combustion is occurring in the exhaust manifold. This is usually a retarded ignition timing issue. Check your timing and see if that helps the hesitation at idle.

Good luck,

Rebel Faggioli

Dec 20, 2008 | 1986 Pontiac Fiero

1 Answer

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I agree. I would start by inspecting from the tail lights wiring and move up. You will have to remove interior pannels to see the harness.

Dec 11, 2008 | 1986 Pontiac Fiero

2 Answers

I just bought a 1986 fiero 2.8 v6 when i start the car it run about 5,000 rpms and will not come down to an idle


Check the EGR tube that bolts to the bottom of the upper intake (close to the throttle body) to the EGR Valve for cracks. Also check for Vacuum leaks. Also have the cold start system check for problems. The COLD START INJECTOR SWITCH might be bad.(The cold start injector switch activates the cold start injector on all V-6 Fieros. This switch turns on the cold start injector on initial start up to get the engine to start quicker and run smoother when it is cold.)

Jul 30, 2008 | 1986 Pontiac Fiero

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