Question about 1997 Pontiac Grand Am

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97 pontaic grand am error code po300 replaced the spark plugs and map sensor and plastic housing on the coil packs still idling funny reset error code it came back on still runny funny

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6ya6ya
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Posted on Jan 02, 2017

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fixincars
  • 335 Answers

SOURCE: 1993 pontiac grand prix 3.1 liter

the 3.1 had some EGR problems, EGR valve stuck open, blown diaphrams, Plugged passages Im not saying that is all your problems and I believe yours has whats called a linear EGR about $350.00 from the dealer (and that is the only place you ever consider buying such a critical part for the emissions system regardless of the cost)
That car is so antiquated as far as computers go that relying on the codes is nearly pointless! Map code can set because of low engine vacuum which you will have with a poor running engine, Check for 5 volt reference voltage at the TPS and MAP with the key on and engine off if no 5 volt reference I suspect a Computer. Computer Ground is on the Thermostat housing and needs to be clean and secure.
There is a legit test in the GM factory manual called the TAP TEST take the ECM (computer) and slap it with an open hand, if the symptoms change the ECM is bad it's very common in the early-mid 90s for the computers to go bad in one way or another the circuit boards come loose and suffer also from cold solder joints.
Make sure the wires are on the correct plugs and hopefuly you used factory plugs and wires and No split fire or bosch plugs only AC delco
Make sure you have good spark on all 6 cylinders.
Contact me at fixincars@yahoo.com with the results and any feedback or questions

Posted on Sep 19, 2008

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dustyboner
  • 331 Answers

SOURCE: 2000 Pontiac Grand AM trouble code P0300

Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:

  • fuel injectors / fuel pressure
  • coolant temp sensor
  • compression - to check for bad head gasket
  • ignition control module
  • EGR system - make sure the valve isn't stuck
  • crank position sensor.
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.

Posted on Oct 15, 2008

  • 1201 Answers

SOURCE: location of coil packs

on the back side of the engine.

Posted on Mar 27, 2009

csmock132
  • 4669 Answers

SOURCE: po300 code, replaced 1 crank sensor needing to know voltage on se

Resistance check the coils. Check for spark on all 6 cylinders.

Posted on Apr 02, 2009

  • 68 Answers

SOURCE: po300 multiple misfires.I have changed the coil

reset the ec module by disconnecting the battery for a few minutes. If that does not work have autozone do a free scan and ask them to reset the codes.

Posted on Oct 13, 2009

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1 Answer

2004 grand am ecotoc idles surges from 500 too 1000 rpms. i had a PO300 code and i replaced map sensor,maf sensor, fuel regulater, spark plugs and boots,icm and coil pack. now i have no code showing b


three things to check-idle air control valve if you haven't checked already-a crack or leak in the intake manifold-or clogged ports in your intake manifold

Mar 24, 2013 | Cars & Trucks

1 Answer

What's your problem? my 2004 mercury monterey has eight codes ,po301,poo53,po106,po316,po300,po304,po305,and po306


PO 300 is multiple misfires detected
PO 301, 304, 305, 306 are misfires in cylinders 1,4,5,&6
PO 053 is HO2S Bank 1 Sensor 1 Heater Resistance
PO 106 is MAP/BARO CKT Range / Perf
PO 316 is Misfire detected 1st 1000 Revs.

On a misfire, I usually push towards the spark plugs, plug wires, and coil packs / distributor coil.
You have PO 106 and PO 053 that need to be inquired about at nearest AutoZone.
They can give you an idea as to what is the problem on these.

Did a MAP sensor **** out and cause all the misfires ?
Did a misfire cause the MAP sensor error?
You see what I'm saying ?...Something caused all the misfires...thinking MAP...but not that familiar with the function of the MAP.

Hope this helps...

Aug 13, 2011 | 2004 Mercury Montery

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How to replace spark plugs on 2000 jeep cherokee classic 6 cyl.? Also does 2000 cherokee have inline fuel filter?


TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Jul 20, 2010 | 2000 Jeep Grand Cherokee

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1996 Grand Am: my pontiac grand am gt, misses while idleing and h...


may be a coil pack. or even a bad spark plug. whens the last time the plugs have been changed?

May 18, 2010 | 1996 Pontiac Grand Am

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

2 Answers

1992 pontiac grand am no acceleration, a rough idle (engine miss)


Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.

Apr 22, 2010 | 1992 Pontiac Grand Am

1 Answer

Loosing power after replaced coil housing and wires


Possible the coil code is a "leftover" if you did not clear the codes after changing what you did. You can clean the internal wires on the air flow sensor with a Q-tip and some carb cleaner. the map sensor can be tested by following instructions in either haynes or chilton manual. Don't replace anything till you do testing. And of course, check the vacuum lines for damage...any cracked or disconnected will cause whatever they are attached to, to not work.

Sep 01, 2009 | 2001 Pontiac Grand Am SE

1 Answer

Po300 code, replaced 1 crank sensor needing to know voltage on se


Resistance check the coils. Check for spark on all 6 cylinders.

Apr 02, 2009 | 1999 Pontiac Grand Am GT

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