86 5.4 FI rough Idle
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Senior User
Joined: Mar 2004
Posts: 272
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From: Fountain
86 5.4 FI rough Idle
Only 86K original. 5.4 FI. Doesn't get driven or started with any regularity. Just started it yesterday and it has a rough idle with rpms rising and falling.
Any ideas?
Thank you
Any ideas?
Thank you
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
There is no such thing as a 5.4L from the factory in these years... do you mean a 5.0L / 302 ci? That's going to be the only EFI-equipped V8 available back then.
Regardless, if it's computer-controlled EFI, then ask the computer what it thinks is going on - IOW pull the codes.
Regardless, if it's computer-controlled EFI, then ask the computer what it thinks is going on - IOW pull the codes.
Posting Guru
Joined: Apr 2011
Posts: 1,636
Likes: 5
From: Orlando area
Maybe it is time to clean the throttle body and Idle Air Control valve with "throttle body spray cleaner". If the IAC doesn't move freely, the idle speed will hunt.
PS. I always replace the spark plugs after cleaning the throttle body and IAC.
PS. I always replace the spark plugs after cleaning the throttle body and IAC.
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 272
Likes: 0
From: Fountain
There is no such thing as a 5.4L from the factory in these years... do you mean a 5.0L / 302 ci? That's going to be the only EFI-equipped V8 available back then.
Regardless, if it's computer-controlled EFI, then ask the computer what it thinks is going on - IOW pull the codes.
Regardless, if it's computer-controlled EFI, then ask the computer what it thinks is going on - IOW pull the codes.
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sandymane
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