Question about 1997 Pontiac Sunfire

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1997 2,4 sunfire cylinders 2 3 misfire. coil has been replaced, plugs & fuel pressure are good, and cad converter has been dropped..was melted almost shut but now fixed. what do i check now?

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I would suspect a head gasket or head problem.. the catalytic converter being plugged causes heat build up in the engine and overheating in the engine can cause failure of the head hasket or head itself. The reason your cylinders are misfiring could be water leaking from a water port in the head and into the cylinder which would cause the cylinder not to fire..there might be some steamy vapor coming coming out of the exhaust if that is happening

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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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

3 Answers

My 1996 Taurus when I press the gas pedal when cold it sputters and lacks power. When it warms up it runs great.


Possible causes - Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak

The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes



When is the code detected? Engine Cylinder 5 is Misfiring.


When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.



Oct 21, 2014 | 1996 Ford Taurus

1 Answer

2.3l 2001 ford ranger rough idle and running rich and misfiring with p0301 code


You have to correct the cylinder misfires first

You may have vacuum leaks somewhere in the
intake or exhaust

You really need to look at data with a scan tool

You start with Mode $06 & cylinder misfire count ,if that
even works well on your motor

Then you look at fuel trim & add short & long together,
to get an idea if it is running rich,which would be a lean
condition from a vacuum leak or rich from leaking injectors

All the data is only good if you haven't cleared it or disconnected
the battery. If you did, then you have to drive until all I/M Monitors
run & then look at data

You look at O2 sensor data & even scope them

You made no mention of checking for codes
No mention of a cylinder leak down test for valve leaks
Exhaust Converter age or condition !
Fuel Pressure !

Mar 05, 2014 | Ford Ranger Cars & Trucks

1 Answer

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

1 Answer

Crossfire misfire 4/5


DTC codes that will trigger P0304 Misfire Detected Cylinder #4 & P0305 Misfire Detected Cylinder #5.

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

Possible Solutions:
- Perform Injector Service
- Replace Spark Plug
- Replace Injector
- Replace Ignition Coil

Jan 17, 2011 | Chrysler Crossfire Cars & Trucks

2 Answers

Engine code states cylinder 2 misfire. Replaced


sounds like a bad injector, just connection at the injector, also check for leaks at intake, one more thing , do a compression test on that cylinder start there, good luck.

Oct 24, 2009 | 1997 Pontiac Sunfire

2 Answers

My Audi A4 1997 1.8 Turbo is misfiring in the #2 cylinder. Changed the plugs and replaced the coil and still receiving the same code.


Check the wiring to the coil

Check to make sure the fuel injector is working properly.

Check compression on the cylinder

May 21, 2009 | 1997 Audi A4

5 Answers

Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...


misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

Mar 07, 2009 | Porsche 911 Cars & Trucks

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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