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#Surging and bucking under load

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 Post subject: Surging and bucking under load
PostPosted: Sun Jun 26, 2016 5:31 am 
In Neutral
Joined: Fri Jul 31, 2015 3:38 am
Posts: 27
Location: lower mainland bc
Hey guys. Not sure if im posting in the correct area. Anyways
As of yesterday my 91 na22 5mt swapped wagon started to act rather strange. Under normal driving say im heading down the road it will almost miss like iv just jabbed the throttle. At idle it will surge between 300 and 1000 rpm. Today i swapped out my tps for a ysed one to see if it hwlped and it didnt. Today it was almost like it wanted to stall no matter what but would always catch itself. Its fine when its cold but as soon as it warms up it will surge at idle and buck under load. So far iv tried a different maf that didnt work. While running i disconnected the iac and idle went up? Shouldnt it drop?? XD im thinking i need an iac or a coil only because ot seems to feel like its an ignittion issue almost like its retarding randomly. If anyone has some ideas id love to hear them. Cheers

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91 legacy wagon 22 na
93 legacy wagon currently no enging


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 Post subject: Re: Surging and bucking under load
PostPosted: Sun Jun 26, 2016 8:36 am 
Fourth Gear
Joined: Mon Aug 31, 2009 9:09 pm
Posts: 1180
Location: Rochester, WA
Vacuum leak?

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2005 Legacy GT Limited Wagon 5-Speed. Stock-ish ;)


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 Post subject: Re: Surging and bucking under load
PostPosted: Sat Jul 02, 2016 9:34 pm 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 27020
Location: Houston, Tx
Unplugging the IAC will make the idle go up.

With temperature related issues I usually suspect the coolant temp sensor. It's a relatively inexpensive part to replace so I'd maybe suggest that first and see if that makes a difference.

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surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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