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Old 01-13-2013, 02:37 PM   #1
cowboy_Rob
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Default 98 forester maf questions

Just picked up a 98 forester dohc for a beater while I rebuild my wrx engine. Now the newer subarus are very picky about rescaling the maf sensor for different intakes so I'm wondering if this one is as picky. It has a cheesy rigged together cold air intake on it and driving it it has some hesitation and dead spots. Figured I'd check here if I should be buying a stock intake to put on before I mess with doing a tuneup and checking the tps sensor and all of that. Thanks in advance.
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Old 01-13-2013, 03:03 PM   #2
Elbert Bass
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Quote:
Originally Posted by cowboy_Rob View Post
Just picked up a 98 forester dohc for a beater while I rebuild my wrx engine. Now the newer subarus are very picky about rescaling the maf sensor for different intakes so I'm wondering if this one is as picky. It has a cheesy rigged together cold air intake on it and driving it it has some hesitation and dead spots. Figured I'd check here if I should be buying a stock intake to put on before I mess with doing a tuneup and checking the tps sensor and all of that. Thanks in advance.

I'd say all of the above. If the intake is rigged then no telling what BS the previous owner read on the internet and believed ;-)
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Old 01-13-2013, 04:20 PM   #3
cowboy_Rob
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the intake is kinda cheesy but if its not gonna hurt anything ill just leave it. i just know the newer ones are very picky and can end up with spots lean enough to damage the engine if you dont retune for it


Last edited by cowboy_Rob; 01-13-2013 at 07:34 PM.
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Old 01-19-2013, 10:48 AM   #4
cowboy_Rob
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Well I tossed a set of plugs and wires in and cleaned the throttle body seems to run fine now so I blame the junk ass Bosch multi point platinums that were in it
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Old 01-20-2013, 09:55 AM   #5
Elbert Bass
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Yup, this ain't no German boxer ;-)
Did you make sure the towers on the coil aren't cracked or burned when you put the wires on?
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Old 01-20-2013, 11:56 AM   #6
cowboy_Rob
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Yea coil looks fine. Just another case of the parts monkeys at autozone convincing someone to buy the 12 dollar Bosch plugs "cuz they cost more they must be better". See it all the time at work take out 12 dollar plugs put in regular 2 dollar ngk plugs and it runs better lol
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Old 01-20-2013, 01:16 PM   #7
Elbert Bass
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Yea coil looks fine. Just another case of the parts monkeys at autozone convincing someone to buy the 12 dollar Bosch plugs "cuz they cost more they must be better". See it all the time at work take out 12 dollar plugs put in regular 2 dollar ngk plugs and it runs better lol
More likely "get a $20 Visa card for selling X number of Bosch plugs" spiff.
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Old 02-02-2013, 09:31 PM   #8
cowboy_Rob
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I figured out the problem causing my hesitation between 3-4k rpm. Seems that the egr was coming on too much because the reference tube to the transducer/sensor was clogged shut completely. Not sure why it didn't throw a check engine light but I cleaned it all out and it got rid of all my part throttle hesitation
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