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Old 08-02-2017, 03:06 AM   #1
VolvoPrince
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Default 98 V70R P1505 and high idle

Alright... Title says it all. New PCV system. All new vacuum hoses, turbo hoses, idle control valve, MAF, throttle body gasket (and cleaned). It idles fine when cold around 900RPM, then goes up to about 13-1400 when warm. Temperature gauge reads fine and rises normally. Lately it has now been surging at stop lights and it's driving me nuts. The CEL is also limiting boost when it comes on... Not cool. What else do I check?! I'm loosing it.
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Old 08-02-2017, 09:39 AM   #2
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Have you looked up that code?
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Old 08-02-2017, 01:11 PM   #3
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Idle control valve code, but I've already replaced it with 3 separate units.
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Old 08-02-2017, 02:46 PM   #4
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Quote:
Originally Posted by VolvoPrince View Post
Idle control valve code, but I've already replaced it with 3 separate units.
Coulda fooled me. Didn't say that in op.

Have you smoke tested or pressure tested for vacuum leaks?
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Old 08-02-2017, 03:33 PM   #5
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Sounds like you've got a vacuum leak somewhere, loose boost hose or something.
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Old 08-03-2017, 01:25 AM   #6
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Haven't smoke tested it but I have checked EVERY vacuum hose possible and replaced it. I've used the carburetor cleaner method of checking for leaks. I'm starting to wonder if it's a wiring issue with the IAC.
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Old 08-03-2017, 12:13 PM   #7
ZVOLV
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Maybe try cleaning the throttle body and resetting the computer.
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Old 08-03-2017, 12:37 PM   #8
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Maybe try cleaning the throttle body and resetting the computer.
Already tried :(
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Old 08-03-2017, 04:11 PM   #9
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If I had it at the shop I would first look up common causes of the code on software. Then probably do a 3 minute smoke test.
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Old 08-09-2017, 11:12 AM   #10
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Quote:
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Haven't smoke tested it
Then do that.
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