Question about 1999 Pontiac Firebird

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Have to replace the #5/#2 ignition coil on a 1999 firebird (3.8l) and I am traveling so my wife who is pretty good with tools can not see what is holding the coil on. what size bold / nuts hold it on? Thanks

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Going off my memory, because im not at the shop to grand a pack and verify it, i know its small.

maybe 1/4 or 5/16 -- unless its metric then between 6 and 8mm.

best i can do for now, hope it helps

Posted on Sep 05, 2010


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1 Answer

My 1999 firebird turns over but will not start

Well it could be any number of things.

A quick way I use to find out if it's ignition (spark) of a fuel problem is to remove a hose from the intake and shoot some starting fluid into the intake. Then try to start the engine. If it starts and runs for a couple of seconds then it's a fuel problem. If it don't, then it's probably an ignition problem.

If you suspect an ignition (spark) problem then you can confirm by using a tester like this;
KD Tools Ignition Tester Calibrated for Standard Ignitions KDT2757 Advance...

Make SURE you get one for HEI ignition, not standard ignition like the one linked. i simply posted it to give you an idea as to what it looks like.

IF the 'check engine or service engine soon' light has been on you could try to scan for codes to see if there is any showing up. Try to scan for 'pending codes' also as that may give an indication as to which way to turn.

If there are any trouble codes DON'T simply buy the part without checking the live data if possible. Rather hard to do without the engine running though, but if you do get it running CHECK the live data.

Firing the 'parts cannon' at a vehicle can get pretty pricey, especially if it don't fix the problem.

Hopes this helps.

Aug 01, 2016 | 1999 Pontiac Firebird

1 Answer

Why will my Mercury Mountaineer only travel 10mph

Failed Ignition Coils & cylinder misfires

Have you not checked for codes?

Pretty soon the new converters will fail

The bad coils spike the pcm drivers & you
loose tps signal & thus go into failsafe &
6 to 10 mph

Someone worked on it & has little knowledge
about Fords,never did the requires testing or
used the scan tool data or possibly never road
tested,happens all the time.

Jul 28, 2014 | Mercury Mountaineer Cars & Trucks

2 Answers

P0302 cylinder 2 misfire detected

the problem is a sparkplug or wire you must be replaced

Apr 22, 2014 | 1999 Toyota 4Runner

1 Answer

P0300 1999 firebird

P0300 means that a misfire was detected. Unfortunately that doesn't narrow it down much. You'll need to do more diagnostics to find out if it's being caused by ignition or fuel. A good scanner will have a misfire counter that can help tell which cylinder is causing it unless it's intermittent. Good luck.

Mar 19, 2012 | 1999 Pontiac Firebird

1 Answer

My 1999 firebird has been on a computer and a firing problem for number 5 cylinder came up, changed plugs and plug wires and its still doing it what else could cause this problem

Misfire #5 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps.

Oct 06, 2011 | 1999 Pontiac Firebird

1 Answer

Need location of coolant temp sensor so it can be replaced

Here it a pic of the CTS for the computercoolant temp sensor

(1) EVAP Canister Purge Solenoid
(2) Fuel Pulse Dampener
(3) Fuel Rail with Injectors
(4) Crankcase Vent
(5) Left Bank Ignition Coils/Modules
(6) Left Bank HO2S Sensor 1
(7) Engine Coolant Temperature (ECT) Sensor
(8) Fuel Pressure Gauge Test Connector
(9) Throttle Position (TP) Sensor
(10) Idle Air Control (IAC)
hope it helps if you need more info just ask!dont forget to vote on the answer thanks have a good day DB

Aug 19, 2010 | 1999 Pontiac Firebird

1 Answer

Firing order

For the 3.8L
Firing Order:
(front of vehicle)
Ignition Connections:
(front of vehicle)

Feb 18, 2010 | 1999 Pontiac Firebird

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