Rough idle remains an issue - Ranger-Forums - The Ultimate Ford Ranger Resource

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-23-2011
rileyw05's Avatar
Thread Starter
Join Date: Nov 2005
Location: Waycross, Ga
Posts: 121
Rough idle remains an issue

Ok, ive been having a rough idle on my 99 4.0. After research i thought i had narrowed it down to intake gaskets. After changing them my lean codes went away but i still have a rough idle. While in the back yard the other day i decided to try and lock in in 4x4. The transfer case engaged but it was still in two wheel peel. So this tells me the hubs are not engaging and i have a vaccum problem. I have not been able to find a leak anywhere, any ideas? Could it be the smog pump?
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Old 07-26-2011
brichmond's Avatar
Join Date: Dec 2006
Location: IA
Posts: 116
sry to say but the ohv doesnt idle like a sohc. it will b rougher. do a compression test n c if all the cylinders are realitivly even
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Old 09-01-2011
notsob2012's Avatar
Join Date: Jan 2011
Location: indpls,in
Posts: 94
ive got a 94 4x4 thats started dying on me at stoplights and such it starts right back up but the rpm bounces and once it gets under 1000 it drops strait to 0 and is dead again its got to the point now i drop it into neutral when i know im going to be waiting to i can give it gas without rear ending anybody any ideas on what to look for
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