Question about 1997 Pontiac Sunfire

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I have a 96 Pontiac sunfire GT with the 2.4 engine it has a super bad misfire I have replaced the map sensor, plugs, coil pack, fuel rails. what elsa could be causeing this promblem

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  • Pontiac Master
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I`m assuming this is a dohc motor.have you checked the ignition module and the connections at the module.its located on the cover where the electrical connector fastens to it.it could also be a jumped timing chain possibly by a bad chain tensioner or worn out chain.

Posted on May 22, 2011

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I have a 96 sunfire that misfires and breaks up when it gets over 4000 rpms. It has 150 psi on every cylinder, the timing is right, has good fuel pressure, good plugs and wires, changed all the sensors,...


have you checked your fuel pressure @ 4000 rpms under load going down the road ?.... if good my next step would be ignition module if it has one under the coil packs , not too familiar witrh eco techs

May 31, 2012 | 1996 Pontiac Sunfire

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Hi i have a sunfire 1997 recebtly my car started to missfire his idle stay beetween 500 and 1000 when step on breaks and it wants to shut down i have change spiplug crank censor map censor and the coil...


Have you changed the spark plug wires? This is the most common cause of a misfire. After changing the wires, I would then have the Timing checked and a new timing belt installed. If this doesn't fix the problem, you may have a Crankshaft Position Sensor or Camshaft Position Sensor failing. If this doesn't fix the problem, have your fuel pressure tested.

Feb 14, 2011 | 1997 Pontiac Sunfire

2 Answers

Replaced motor in 96 sunfire car will not run. Acts like it is flooding out. Have got it to run a few times. Changed map sensor, coil pack, fuel pressure sensor, injectors, crank position sensor, pretty...


Did the old motor run? Is this a used motor? Did you hear this motor run before you installed it? Have you tried running it with the exhaust unbolted from the manifold?

Nov 10, 2010 | 1996 Pontiac Sunfire

1 Answer

P134, p0141, po300, po130 and po135. 2005 Sunfire.


Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 16, 2010 | 2005 Pontiac Sunfire

2 Answers

2001 Pontiac grand am misfiring. replaced plugs,


mine just had that problem...its your M.A.P...I went to the shop to get my check engine light to go off and it said my MAP was bad so i had it fixed and I dont know what they did but after they put it on my car started misfiring...I just left mine unplugged and it runs like new...but if i plug it up my car misfires again...

Jan 31, 2010 | 2000 Pontiac Grand Am GT

2 Answers

1997 pontiac sunfire 2.2litre appears number two and four cylinders are dead but all have spark. after running engine for a bit plugs on those dead cylinders are blackish but dry car runs some what better...


sounds as thou thoses 2 clyinders are running rich either from excesive fuel aka bad injectors or drivability issues bad map sensor leaking intake ? need to scan ecm readings check all the sensors ? are you sure coil pack not failing ?

Aug 31, 2009 | 1997 Pontiac Sunfire

2 Answers

1997 Potiac sunfire


I would check the codes first, with OBDII systems the codes will give you a good idea of what my be doing it, the ETS off is your Electronic Traction-control System, either you have the emergency brake pulled up or it is a seperate issue,

things that may cause your symptoms are,
bad fuel pump-check fuel pressure,
bad MAPS-running the codes should show you if it is but you can also do a diagnostic test
misfire-same as the MAPS, codes will let you know which cylinder then it would be a matter of replacing spark plug and wire(I can't stress enough on getting high quality plugs and wires), if that does not fix the misfire then a compression test is in order
bad coil pack(s)-misfires on two cylinders that are on the same pack, sorry but I do not remember which cylinders are fired by which pack but if you follow the plug wires over to the pack you will see,
vacuum leak-hard to identify but may also have something to do with your ETS light, check the booster vacuum hose for cracks
bad IAC-again the codes should tell you but they may not,


there is the points that I would start off with, I hope that I have been helpful

Oct 11, 2008 | 1997 Pontiac Sunfire

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