Question about 1996 Pontiac Sunfire

6 Answers

1999 Sunfire 2.2 skips at 400 rpm

My sunfire at 4000rpms skips and backfires in the muffler and will not go above 4000 rpms. Any Ideas on what he problem may be?? It's a good little car and great on gas and I got it for nothing at my work.

wkodi@comcast.net

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  • wkodi Jul 07, 2008

    I do not have a Distributor I have Coil Packs. Would This Cause the same problems? It goes to 4000 rpms and then skips and backfires in the exaust. But when I 1st start it, it runs fine at low RPM. My sunfire at 4000rpms skips and backfires in the muffler and will not go above 4000 rpms. Any Ideas on what he problem may be?? It's a good little car and great on gas and I got it for nothing at my work.

  • wkodi Jul 08, 2008

    OK, so does anyone know if the problem I am having with it can be from the coil packs?? She goes to 4000rpms and then cuts out and backfires in the exaust.

    Thanks All

  • wkodi Jul 08, 2008

    I did this already. I ran it thru and they seem clean. The engine seems to run and idle fine at low rpm. It's when I rev to 4000 that it skips and backfires, it only backfires a liitle not like a big bang or anything. It just won't go over 4000 rpms and stay at that. Would bad Coil Packs cause this??

    Thanks

  • wkodi Jul 08, 2008

    No arcing at all. Like I said it does idle fine at regular Idle sitting still. But when I rev her up to 4000 she skips and does the backfire thing. I hear they are great little cars and good on gas. I thought if I could get her running good I would start driving it to work with the gas prices being what they are.

  • wkodi Jul 08, 2008

    I will try to replace the coil packs and let you all know. Thanks for all the great feed back.

    Phil

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6 Answers

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Here's a list of posible causes, I would lean towards a timing issue

1 Inspect Ignition Timing Incorrectly adjusted engine timing. 1999 Sunfire 2.2 skips at 400 rpm - grey_line.gif 2 Inspect Timing Chain Slipped or worn timing chain. grey_line.gif 3 Inspect Timing Belt Slipped or broken timing be1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifsrc="http://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 4 Inspect Point Set Burned, w1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifectly set ignition points. grey_line.gif 5 Inspect Firin1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifrk plug wire(s) not connected in correct firing order sequence 6 Inspect Distributor Worn, loose or incorrectly adjusted distributor. 7 Inspect Crankshaft Position Sensor Damaged or faulty crankshaft posi1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifr circuit. grey_line.gif 8 Inspect Crankshaft Timing Gear Worn ti1999 Sunfire 2.2 skips at 400 rpm - grey_line.gif grey_line.gif 9 Inspect Spark Plug Wire Loom - Performance Improperly adjusted or worn/malfunctioning carburet1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifsrc="http://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 10 Inspect Camshaft Position Sensor A Damaged or faulty camshaft position sensor will transmit incorrect ignition and fuel delivery information. grey_line.gif 11 Inspect Camshaft Interrupter-Magnet A Damaged or faulty camshaft interrupter-magnet will cause the camshaft1999 Sunfire 2.2 skips at 400 rpm - grey_line.gifsor to receive and transmit incorrect ignition and fuel delivery information. grey_line.gif 12 Inspect Camshaft Timing Gear Worn or broken camshaft gears may 1999 Sunfire 2.2 skips at 400 rpm - grey_line.gif fuel intake, compression, combustion and exhaust. 13 Inspect Distributor Cap Loose or cracked distributor cap grey_line.gif 15 Inspect Point Dwell Point dwell not within specified range grey_line.gif 16 Inspect Point Gap Incorrect point gap setting. grey_line.gif 17 Inspect Timing Set Slipped timing chain or worn timing gear(s)

Posted on Jul 07, 2008

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  • 487 Answers

Sounds like a faulty oxygen sensor. Just go to autozone or something like that and let them test it. Sure it will be that.
If it is the sensor put in a new one and than unplug the car from the battery for 24 hours to reset the computer. Your problem should be solved

Posted on Jul 08, 2008

  • eric bosman
    eric bosman Jul 08, 2008

    is a known problem with the sunfires

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A bad coil pack can cause this, it could be just one, could be all. Could also be the timing belt has stretched or skipped, a partially plugged egr valve, a bad o2 sensor, a partially plugged catalytic converter, a loose vacuum line for the advance, bad plugs, bad plug wires, a bad cam sensor, or a bad throttle positioning sensor. Any of these will cause the car to sputter at a higher rpm.

Posted on Jul 08, 2008

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Sounds like you could have a coil pack out or if you have plug wires one of those wires might be arching. It's also possible that a spark plug is bad but normallying it's one of the first two before the plug.

Posted on Jul 08, 2008

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Before you do anything else, run some injector cleaner through the car. Sounds like it is leaning out.

Posted on Jul 08, 2008

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  • 1,036 Answers

Hi,
This sounds like an ignition fault. This would explain the fuel sometimes not being burnt and exploding in the exhaust.

Pull the plugs, and inspect them for damage. Gap them to within limits and try again - or just replace them if it is near a service interval.

Clean your HT leads and distributor with an alcohol based cleaner. Then refit and try again Again this is a major cause of misfires.

If still no good, replace leads and check distributor assembly for wear. Replace if corroded, cracked, worn or burnt.

This should cure the problem. If not - ask again.

Thanks for using Fixya!

Posted on Jul 03, 2008

  • Richard Perkins
    Richard Perkins Jul 07, 2008

    I too have coil packs sitting on top of the injectors on my little peugeot.



    Last year it started to misfire. A short time after that it died completely.



    A local garage stripped the loom, but could not fix. The Peugeot dealer quoted me £1200 for a new coilpack and ECU. A local garage replaced ECU and coilpack and now all is fine again.



    The fault originated in one of the coils in the coilpack. This then caused a misfire, but also fed back EMF to the ECU - which soon fried it too. So, new coilpack, new ECU to fix.



    This has been one of the most expencive "little" cars I 've ever had.

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