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This could be a bad tachometer signal filter.
Here is an inexpensive replacement. https://www.wc-autoparts.com/tachometer-signal-filter-camaro-firebird-fiero-corvette-gm-gmc-truck-monte-carlo/
Pretty easy to install.
The OEM signal filter have resistors and capacitors that dry out and go bad after 20 years. GM placed signal filter on most of there vehicles between the mid 1970's and the early 1990's.
The other item to check is the tachometer circuit board. They go bad as well. Here is an inexpensive replacement. https://www.wc-autoparts.com/1985-88-fiero-tachometer-circuit-board-ready-to-install-pre-calibrated/



1986 Pontiac... | Answered 2 days ago

Look at the body control module.

2002 Pontiac... | Answered on Jul 21, 2020

You say it cranks but won't start ? Try spraying carb. clean into the engine through the throttle plate . If it starts an dies you have a fuel delivery problem . If it doesn't pull the coils an module .

Pontiac Cars &... | Answered on Jul 16, 2020

the low side fill port is on the passenger side rear or the engine.

Pontiac Cars &... | Answered on Jul 13, 2020

Water pump is on the left side of the timing belt in the cover and spins on an O-ring to adjust the belt. Their is a coolant pipe to the the thermostat housing behind the timing covers backing plate also. Be sure to replace the timing belt with the tensioner/ oil seals along with the water pump. Remove the timing covers back plate and you will find two bolt to the pipe as mentioned. It has a large o-ring behind it. Have fun with this one. From: Ronnie Wrench

1991 Pontiac... | Answered on Jul 09, 2020

check the vents/drainage slots ain't blocked. next check seals for damage/warping.

Pontiac Cars &... | Answered on Jul 07, 2020

Is the engine turning over with the key in the start position? If the engine is not spinning over and you hear a whining noise, the starter is not engaging the flywheel. If the engine is turning over with the starter engaged, the engine has most likely jumped time that creates low or no compression which results in the whining noise.

Pontiac Cars &... | Answered on Jul 06, 2020

Try cranking it at night in the dark and see if you see spark jumping around the spark plug wires or distributor cap..If you do..Replace them..
Remove distributor cap and check contacts on cap and rotor..
Partially remove coil wire and have someone crank engine and look for spark at wire end.
Pretty sure your car has points in distributor ,be sure they're clean or replace them..
Use Google for locations.

1970 Pontiac... | Answered on Jul 03, 2020

Sure sounds like a flat battery.Could also be loose or poor connection with the main battery cables.Try running a wire from the positive terminal of the battery directly to the starter solenoid,if you leave ignition on vehicle should start.If the battery has collapsed a cell jump starting does not always work.You must confirm by swapping the battery to eliminate it as the cause of your fault as any tests are useless unless you do so.let me know once youve confirmed battery is ok.

2000 Pontiac... | Answered on Jul 03, 2020

What's the firing order on 04 3400 motor

2001 Pontiac... | Answered on Jun 30, 2020

On the 2006 G6, it is mounted to the power steering pump near the alternator. Remove the dipstick from the reservoir. The fluid level should be in the cross-hatched area of the dipstick. Add small amount of power steering fluid until the level is correct.

Pontiac Cars &... | Answered on Jun 17, 2020

This could be a few things. Check the fuse and relay for the fan. They will be in the fuse box under the hood.
Check the wire connectors to the fan. They could be dirty or corroded. If you can disconnect this connector you could apply a 12 volt supply directly to the fan to see if it 'kicks in'.
If these are OK. It might be the sensor that trips the fans on and off. That will be located on or near the thermostat housing.
If your engine is running hot it could be a faulty thermostat not operating the sensor correctly.
Running a vehicle with no cooling fans isn't a good idea as it'll overheat, cook the engine and cost you serious money to fix.
**If your are in any doubt get a Good mechanic to look at it. Most mechanics won't charge to check a vehicle.**

Pontiac Cars &... | Answered on Jun 17, 2020

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