Unexplained High Idle Problem
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Joined: Feb 2005
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Unexplained High Idle Problem
The vehicle is 98' E350 5.4 350K miles. It only does it sometimes but when it does get the high idle it makes stopping very hard. I'll throw it in neutral and shut it off otherwise it revs up high well over 2K rpm.
I cleaned the TB, IAT and MAF with no change except better running everywhere but this idle problem. It's not throwing a code which is making this hard to trace. Thanks much, Jeff
I cleaned the TB, IAT and MAF with no change except better running everywhere but this idle problem. It's not throwing a code which is making this hard to trace. Thanks much, Jeff
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Junior User
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Didn't know the 98 5.4 still used an IAC valve. Any idea where its mounted on an E350?
As of right now I test drove it today and it seems to be back to normal idle speed. Maybe the other stuff I did cured it but still worried it may return. Thanks so much for the reply and info!
As of right now I test drove it today and it seems to be back to normal idle speed. Maybe the other stuff I did cured it but still worried it may return. Thanks so much for the reply and info!
Postmaster
Joined: Nov 2006
Posts: 4,517
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From: SE Wyoming
They go bad also but I've had more issues with the IAC on the modulars, never had a TPS problem yet.
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Cleaned the IAC and test drove it and so far so good. Nice smooth idle and no surging or fast idle anymore.
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