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I bought a used 1999 Saab 93 about a year and a half ago, currently has 107,000 miles. My check engine lite has been on most of the time. I replaced the DIC about a week ago. I intially took my Saab to a Saab specialist he could not isolate the problem. The codes are P1171 and P0171. After much reading and looking for my MAF, I could not find one or where it might plug in. I understand it should be attached to the air filter compartment and intake tube. Maybe the problem, duh? But where the heck is the wiring for plug & play so to speak? Any assistance would be much appreciated! Thanks...........
 

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If your car has a red DI cassette it will be T5 engine management which doesn't use a MAF. The main sensors are the O2 on the downpipe, the intake air sensor on the throttle intake and an intake pressure sensor (MAP) on the underneath of the LH strut brace. If it's the MAP sensor the first thing to do is check the rubber pipe from the throttle to it for cracks or splits. At 107k miles it's worth replacing all of these small diameter vac pipes. Also I would change the O2 sensor at that mileage as well.
 

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Thanks

I do have the red DIC, so I do not have a MAF. I have the map sensor instead. I have check and replaced most of the rubber lines. I will do a double check on things. Basically, the Saab guy I go to did most of this. The o2 sensor has been replaced. The codes are lean mixture. My mpg is excellent. He mentioned he had a similar issue with same year/model. He took the glove box out and had to re-sodier some wires, and the problem was solved. I am not sure it is worth it. The car runs great. Anyone of know this as a fix?

Thanks!
 

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You can check out the ECU/sensors harness with a multi-meter and some slave wires, or do a close physical examination of the connectors..

Use some bluing on the connector, then the connection scrape would be evident.
All of the vacuum hoses should be checked out..
I do think the sensors can be overly sensitive at times.
 

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The MAP is pretty reliable. The vacuum hose from the TB to the MAP (at least on the NG900) used to be the one solitary silicone hose among the vacuum lines. The hose could still have a crack in it, but not very likely.

If the FPR does not follow the manifold pressure fast enough, for whatever reason, then relative fuel pressure will lag boost, and the engine will intermittently run lean when accelerating on open throttle. The fuel will eventually catch up to the boost, and 99% of the time the engine will run just fine, but lean mix faults will be generated now and then during maximum boost.

A faulty Evap canister purge valve can do the same thing at idle - at times, the engine will get too much air/oxygen, for the amount of fuel being fed in, and the A/F mix will run lean.
 

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Discussion Starter #7
Thanks again!

Interesting on the Max boost. I was running the car at over 110 mph, I did this a few times. After the last run the engine lite came on and has never gone off.

However, shortly after buying the car the engine lite came on. After a couple of weeks it went off. And, came on after I did the above.

Happy Thanksgiving!
 
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