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Old 02-22-2008, 04:51 PM   #1
sharpe
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Member#: 160784
Join Date: Oct 2007
Location: georgia
Vehicle:
02 wrx
silver

Default boost spike / surging when raining

anyone have any clues as to what could be causing this? the boost only spikes when it is raining outside. does it in every gear...coming home on the interstate today running 80 mph around 3000 rpm...it felt like it wsa goign to shut off on me. almost like the motor was having misfire issues...but it only does it when it is raining.

went through a drive through carwash earlier this week and noticed the same thing for the first few minutes...so it seems to stop after everything is dry...i am lost at this point and really don't want to get rid of the car...but at this point i can't drive it in the rain...so i might as well have a motorcycle

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Old 02-23-2008, 03:28 AM   #2
STIBungy
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It'd be easier for people to help you troubleshoot if you listed the mods you have.
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Old 02-23-2008, 09:23 AM   #3
sharpe
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sorry.

2.5l STi block with WRX heads
TGV's have been removed
uppipe/turboback
VF39 with modded injectors and a walbro 255
shortram intake


I am going to try swapping out the intake and see if it is the MAF getting wet.
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Old 02-23-2008, 10:24 AM   #4
4ST-AIR
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TBD Looking for STI
Back in the Game!

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Well take the rain out and what do get? A dry car, and it seems you have a possible electrical short or grounding issue. Go back to the last time the car didn't do it and think what you modded if nothing then start at the MAF.

Have you ever had that tuned by a pro?
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Old 02-23-2008, 10:38 AM   #5
shakur45
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Obsidian Black Pearl

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I would swap out the intake, checking the maf is def. your best bet.
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Old 02-24-2008, 09:09 PM   #6
sharpe
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silver

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yes just got tuned by SS at topspeed...talked to the origional owner about the issue, he suggested going back to the stock air box....but i think i will just swap out the short ram for a true cai and see what happens.
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