Question about 2000 Saab 9-3 Viggen

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Hi, I have a 2000 Saab 93. The engine light is on. I took it to have the codes read and they came up with two,p1334 and p1312. They said they were dealer codes so they could not tell me the problem . They said one of them said something about the ignition miss firing. I changed the spark plugs and the light went out for a day. And now it is back on.I also change the direct ignition unit. That I purchased used so know I don't know if it was any good. Can you help? Please.

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  • rlw8s Jun 25, 2009

    Thank you, I will try your suggestions. I always use 93 octane so I do not think that is the cause.

  • rlw8s Jun 25, 2009

    Thanks again.



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P1312 is ignition coil knock detection cyl 1 and 2 and the cause is quoted as wiring open circuit/short to positive, ignition coil assy, ECM.
P1334 is as 1312, but cylinders 3 and 4.

The other thing to that would cause detonation too is low fuel octane causing detonation during acceleration. Or dirty fuel injector and dirty fuel filter. Timing would cause this but i don't think your timing is off since you can get it started. Recap, add fuel injector cleaner to your gas tank for the next 3 fill ups and try using a higher octane rated fuel like 91 and replace the fuel filter for now and see if there are any improvments. keep me posted, be glad to help.

Posted on Jun 25, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 25, 2009

    The other thing to is if your using a oil air filter like K&N, you may have to spray clean the MAF and IAT sensor. Use MAF cleaner and follow the instructions. If the MAF and IAT sensors are dirty from oil, they will give incorect readings to your ECM casusing the improper air fuel ratio which should be 14.7 to 1. The MAP and throttle position sensor also will play a part to this problem too. After the throttle has gone past 80% or the turbo boost has started to go up the O2 sensor's go to a open loop and the MAP sensor takes over to sending information to the ECM to have the engine run richer around 11.3 to 1 so you don't have detonation under hard acceleration. Start with the prevouse suggestion and this was just something for you to think about. Keep me posted and did the parts store give you the right spark plugs??? DO NOT USE PLATNIUM SPARK PLUGS Use a good copper plugs, the platnium plugs during turbo boost will heat up like a glow plug promting detontion which is bad for turbo engines. Keep me posted. 

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Engine light on seems to be running fine what should i do?

Posted on Sep 04, 2010

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