Question about 1997 Pontiac Grand Prix

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Misfire cyl-2 plug,wire,coil pack fine injectors fine no vacuum leaks,smoked engine,compression test all fine

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I believe that both 2 and 6 cylinder show up as cyl 2 on the diagnostics tester. so you will need to check the wire and plug for both cylinders.

Posted on Sep 25, 2012

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Posted on Jan 02, 2017

GM Elec
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SOURCE: 1998 pontiac grand am misfire cyl 4

I'm a bit confused concerning your spark plug wires as the standard 2.2 engine does not have them, so my suggestion is based on the 2.2 engine as the 4 cylinder you state you have.
If the secondary electrical has been replaced, I would suggest inspecting the fuel injectors for operation.
The easiest way to test the operation of the fuel injectors is to listen for a clicking sound coming from the injectors while the engine is running. This is accomplished using a mechanic's stethoscope, or a long screwdriver. Place the end of the stethoscope or the screwdriver (tip end, not handle) onto the body of the injector. Place the ear pieces of the stethoscope in your ears, or if using a screwdriver, place your ear on top of the handle. An audible clicking noise should be heard; this is the solenoid operating. If the injector makes this noise, the injector driver circuit and computer are operating as designed. Continue testing all the injectors this way.
If all appear to be functioning we can move on to the next suggestion.
Let me know.
Regards.

Posted on Mar 31, 2009

  • 31 Answers

SOURCE: I have a 1996 Pontiac Grand AM GT 2.4 L. I got a

fuel injector sound like the problem if you have checked the power with a node test the injector and you have pwer then mest likely the ijector is clogged ,so first make shure you have power to the injector hope this is helpfull

Posted on Jan 07, 2010

  • 110 Answers

SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my

A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Posted on Feb 25, 2010

SOURCE: possible vacuum leak dont know what else

What codes did auto zone tell you? You wrote it down,along with the explanation? Why replace the coil packs? You did some kind of test first? You need to spend the money on education first,then test equipment,then parts.

Posted on Mar 09, 2010

csmock132
  • 4669 Answers

SOURCE: 1999 Grand Am 3400 v6 misfire.

I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.

Posted on Apr 09, 2010

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2004 Sorento began with code P0305, cyl #5 misfire. Inspected and replaced plugs, wires, and coil pack on cyl #2. Repair shop told me cyl #5 injector bad so they replaced. Still has misfire.I suggeste


If you had code P0305, I don't know why they would have done anything to the #2 cylinder but if they have already replaced the plugs, wires and injector; here are a few more items to check:
1) Check connections from ECM. Look for any corrosions or bent/broken pins.
2) Check the fuel line pressure
3) Check the engine compression
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Check wiring harness around and including plug to the coil pack. Also check fuel pressure with vehicle running. I'm not sure of the specs but, Iit should be around 35 to 40 psi. at idle, and 50 to 75 at higher RPM's. I've seen Fords run with a bad fuel pump and demonstrate these exact symptoms

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Hi Justin
you seems that you have a good idea about engines and injection systems, lets say that the computer see's rich exhaust and pulls back fuel mixture. creating misfire. why the engine is misfiring on one cylinder only??
my advice to you
1 search for a vacuum leak corresponding to the misfiring cylinder, like a manifold gasket or injector seal.
2, do a compression test for all cylinders, probably you have a burnet valve.
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1998 nissan frontier xe 4 cyl auto misfire cyl #2 engine vibrates like a bad sparkplug when driving


To review - - do you know for a fact the distributor is firing that cylinder? And do you have power and a ground pulse for that injector ?
You say no vac leak, but have you done a compression test on all cylinders ? Is it possible the egr valve is leaking and affecting that cylinder ?

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1999 mercury mystique cylinder 2 misfire ! Changed gasket, plugs, wires, and coil pack and problem still exist !!! Please help !!!


Okay kevin, the first thing is to make sure there is no vacuum leak, start the car and look and listen around for a hissing sound.if no leak is found then we will move on to the next test which would be a compression test, this test will tell you if the cylinder has compression and will help with the next step. seeing that you replaced the plugs wires and coil pack, if you have good compression then the injector would be the next step. check the connector on injector, if all looks good then the next step would be to swap injectors from that # 2 cylinder with #4 and then drive the car and if light comes back have it scanned and see if the misfire moved to cylinder #4. if it did move then you will be sure it is the injector. do compression test first , test all cylinders, make sure to have all plugs out and unplug coil pack connector when doing compression test. write me back with the results. good day

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Heavy idle, random misfire code 04 trailblazer


I would start with the inlet manifold gasket, these are know to break down causing vacuum leaks which can cause this issue, also check around engine for other vacuum leaks

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Vehicle came in for check engine light on and running rough,i scanned 1 dtc present p0306 misfire detected cyl #6,the coil had been replace a month earlier same problem,i tested injector pulse with noid...


A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.

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2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

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99 dodge caravan #4 cylinder misfires, i replaced spark plug wires and spark plugs. Scanner showed #4 still misfiring, could this be the coil?


It could very well be a bad coil pack,or you have low compression in that cylinder.If the compression is good then go with the coil pack,if not you may need a head gasket or an intake manifold gasket.

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1 Answer

'97 A4 1.8T, coolant leak resulted in brief overheat,leak fixed,diag.code now shows #2 cyl.missing (badly), compression good,injectors good,coils/plugs good,missing badly,could the brief overheat have


did the car over heat for long?
there could possibly be damage to your head like warping due to overheating and blowing a head gasket or something along those lines .
first check the oil dipstick is it milky?
then check the coolant is it oily?
and when it is running is it blowing any white smoke?
if you replaced the plugs and it is misfiring did you plug the wire all the way back on the plugs if not then the problem is a plug wire being loose and loosing connection with the plug.
sounds like a simple fix if you don't have water in your oil or white smoke coming out the exhaust.
troubleshooting it can be a bigger job but if you nail the right symptoms down you can corner the problem.
like if it is a coil pack or bad wire switch them with another one and see if the problem follows the wire or coil pack.for instance take the number one plug wire off and the number two wire off and put the number one wire on number two and see if the number one misfires. if so then the wire is the problem if not then try numbers three and four until you find out which cylinder is the culprit.
good luck and happy hunting.


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