Question about 1986 Pontiac Fiero

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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

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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.)

Posted on Aug 03, 2008

Clutch is going

Posted on Sep 24, 2008

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Posted on Jan 02, 2017

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V6 fiero runs rough no power, vibrates and a has different exhaust sound


Have you checked fuel pressure?
Vac leaks ?
Restriction in the air intake ? Faulty EGR valve ?

Jul 31, 2012 | 1986 Pontiac Fiero

1 Answer

I have an 86 fiero 2.8 v6 the car will start and idle.. when I push the gas to rev it up in park it dies and wont restart for hours.. I had the ignition module checked and they said it was good?? any...


Please check the fuel pressure, there is a fitting similar to the refill for the a/c located on the fuel rail. You local parts store may have the gauge available for rental.

Hope this helps.

Feb 19, 2011 | 1986 Pontiac Fiero

2 Answers

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....


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.

Jun 03, 2010 | 1986 Pontiac Fiero

2 Answers

I need the firing order for an '86 fiero 2.8L V-6


The firing order for this car from right to left is:-

4 Cylinder is 1-3-4-2.

and

V6 or 6 Cylinder is 1-3-6-2-5-4.

Good luck and thanks for using Fixya.

Apr 11, 2010 | 1986 Pontiac Fiero

1 Answer

Rough idling


I would think the most likely culprits would be a bad EGR or TPS

Aug 26, 2009 | 1986 Pontiac Fiero

1 Answer

Bouncing RPMs


My car would do the same thing turned ot to be a loose wire at the coil/distributor. there is a plug connector with tow wires one wass loose I crimped the wire no works great

May 04, 2009 | 1985 Pontiac Fiero

1 Answer

Fiero Engine is spitting


Try replacing the Idle Air Control Valve. If that does not work (which it should) try fixing the Throttle Postion Sensor.

Apr 25, 2009 | 1986 Pontiac Fiero

1 Answer

Engine turns off when coming to a stop


I have used this procedure for years.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 10, 2009 | 1986 Pontiac Fiero

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