Question about 1999 Pontiac Grand Prix

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Where is the #2 cylinder located in a 1999 grand prix, 3.8 6 cylinder - computer said ....misfire on cylinder #2

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  • Pontiac Master
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Back left of engine
where is the #2 cylinder located in a 1999 grand - 5cc87dc.gif

Posted on Oct 08, 2010

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  • Pontiac Master
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Firing Orders NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.
3.1L & 3.4L Firing Order where is the #2 cylinder located in a 1999 grand - gmpc-31-fo.gif

3.8L Firing Order gmpc-38-fo.gif

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Posted on Oct 08, 2010

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  • Master
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Call the dealer, they will supply you with the answer. You can also find the answer online. Have done both many times.

Posted on Oct 08, 2010

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3 Answers

Can catalytic converter on 98 Pontiac grand prix cause misfire on cylinders in car


No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.

To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

Feb 01, 2015 | 1998 Pontiac Grand Prix

1 Answer

How do you reset the ecm in a pontac grand prix 2005 3.8L


Not sure what you are trying to do.
If the cylinder is not firing you would need to figure out if you are missing spark to the plug or fuel to the injector.
After the problem is fixed you can have someone scan the computer and clear the trouble code to turn the check engine light off.

Dec 25, 2012 | 2005 Pontiac Grand Prix

1 Answer

Misfire on cylinder 5 on 1999 grand prix 3.1


have you checked your coil on that cly, or spark plugs at all?

Jan 17, 2012 | 1999 Pontiac Grand Prix

1 Answer

99 pontiac grand prix that is still mis firing even after we changed plugs and wires, not sure what to do now please help


Misfires can be caused by several things including all the parts you have already replaced as well as faulty ignition coils, faulty injectors, vacuum leaks and engine mechanical problems such as low compression.
With the proper equipment, injector operation can be verified by performing injector balance tests, where the operation of the injectors in the misfiring cylinders is compared to the other cylinders that are not misfiring.
Also, engine mechanical failures such as bad piston rings or leaking/burnt valves can be diagnosed with a simple compression test.
An easy (and very inexpensive ) way to verify ignition coil operation is to swap the coil from the misfiring cylinder(s) with the coil(s) from the cylinder(s) that is(are) not misfiring. Then clear the fault codes and drive the vehicle. If the same cylinders are still misfiring, the coil is not the problem. If the misfire moves to the cylinder that you swapped with - replace the coil.
Sometimes, injectors can also be tested this way, but on most GM V-6 or V-8 engines, this is not practical due to the labor involved in "swapping" injectors.

May 10, 2011 | 1999 Pontiac Grand Prix

1 Answer

2002 grand prix 3.1 code says number 6 cylinder misfire detetected. I changed the coil pack spark plug and wire and alSo changed the board tat the coil sets on. Computer stillsays #6 misfire detected. The...


It's a possibility the injector is the problem. It may not have the psi it needs, therefore the cylinder could be misfiring, or the injector could be letting too much fuel in. Before I change the injector, I would try to have someone to clean the injection system to see how it works. The cleaning around in South Carolina is $99-$149 depending on where you go.

Jul 04, 2010 | 2002 Pontiac Grand Prix

1 Answer

1999 grand prix gt 3.8v 6 error codes 300 and 302


The PO300 code is random/multiple cylinder misfire detected. Sinsc you have the code PO302, that means that cylinder 2 is the one misfiring, usually a bad coil pack, or spark plug.

May 12, 2010 | 1999 Pontiac Grand Prix

1 Answer

1999 pontiac grand prix gtp won't start


well from what it sounds like is that it is your fuel injectors try going to a full service garage and have them clean the fuel injectors if you cant get it there go to auto zone and pick up a can of sea foam and do it your self thru a vacum line such as the brake booster there is a vacum line that comes out of that and goes straight to your cylinder that will help you there its recomended once a year or every 15000 miles good luck hope it works for you

Jul 06, 2009 | 1999 Pontiac Grand Prix

2 Answers

Diagram of 3.4 DOHC Motor online


Both knock sensors are screwed into the side of the cylinder head between the front 2 cylinders.

Jun 22, 2009 | 1996 Pontiac Grand Prix

1 Answer

'99 grad prix 3.1 engine missing. P1374 code manufature Ignition


the code reader should tell you what cylinder it is if so switch the injectors around to see if the misfire moves to a different cylinder if it does you have a bad injector

Jun 17, 2009 | 1999 Pontiac Grand Prix

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