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  #1  
Old 01-10-2011, 08:01 AM
dd74 dd74 is offline
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Default check engine

I just had the check engine light come on in my truck with the code bank 1 and 2 detect a lean condition (code 171 and 174 I think) and I found that it had something with the mass air when you have the two codes together. The first things I tried was running 93 octane and fuel injector cleaner this did not work. I have put on the stock mass air, and everything seemed okay at first but the light came back on with the same two codes.
All this started when I ran a bottle of Lucas fuel injector cleaner through the system I had normally used STP. Anyone have any ideas for me. Thanks
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year-99 extended cab xlt, 4wd
Engine- 4.0L
Modifications- volant cold air, bbk throttle body, jet mass air, and new msd spark plug wires and accel coil pack, flow master cat back, camper shell
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  #2  
Old 01-10-2011, 08:05 AM
Clinton Clinton is offline
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Default Re: check engine

this is it ------> click this link http://www.fordrangerforum.com/4-0-s...look-here.html
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  #3  
Old 01-11-2011, 06:26 PM
caryrae73 caryrae73 is offline
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Default Re: check engine

I had the same codes on my 01 Ranger and I followed the advice from link on post above and it fixed mine. My light was on for many months and since the very easy, very cheap fix it has not come back on. It was a gash in the elbow that connects to the pcv. Since you have a 99 ranger not sure how different it is.
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Old 01-13-2011, 10:47 AM
dd74 dd74 is offline
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Default Re: check engine

On the 99 it looks nothing like the pictures posted, and it does not say what that hose is going to if I knew that I may be able to find it that way
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year-99 extended cab xlt, 4wd
Engine- 4.0L
Modifications- volant cold air, bbk throttle body, jet mass air, and new msd spark plug wires and accel coil pack, flow master cat back, camper shell
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  #5  
Old 01-13-2011, 02:31 PM
satan satan is offline
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Default Re: check engine

It's the vacuum side of the crank ventillation (PCV) -- manifold vacuum to valvecover.
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  #6  
Old 05-31-2011, 06:30 AM
bryanh bryanh is offline
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Default Re: check engine

DD 74, did you fix your problem? I too am having this problem. It seems like everyone is pointing people to the 01 and above post for the fix, so I am assuming that I am on the right track, but like you I do not know where to start looking.

Here are some pics, someone in the know please let me know if I am in the right area (found a bad hose while I was looking around, will replace it and let you know if this works):

Edited out the img links, my name is hancoRck minus the R, and it is too dirty for this web site, so the links were not working, I will fix them when I have time. It looks like the vacuum hoses on the 99 are on the driver side of the engine (not sure someone verify please)













If we can get this sorted out maybe I can have these pics posted in that 01 link everyone likes to point people to, and we can at least drop the year down to 99 (maybe 98 I hear they are pretty much the same)

thanks for any help in advanced.
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1999 4 door XLT 4.0 Automatic

Last edited by bryanh; 06-01-2011 at 04:40 PM. Reason: adding images i hope
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  #7  
Old 06-01-2011, 10:41 AM
dd74 dd74 is offline
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Default Re: check engine

The problem I was having ended up having more to do with the modifications I had done, a bigger mass air and cold air intake was giving me the lean reading, when I put the factory mass air on the problem went away, so I had to have the computer reprogrammed (used programmer from JET). Yes, I do think the vacuum line is on the driverís side by the firewall on the back of the manifold
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year-99 extended cab xlt, 4wd
Engine- 4.0L
Modifications- volant cold air, bbk throttle body, jet mass air, and new msd spark plug wires and accel coil pack, flow master cat back, camper shell
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  #8  
Old 06-01-2011, 04:46 PM
bryanh bryanh is offline
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Default Re: check engine

I am glad you got your problem fixed. I am all stock with mine (I think just got it). I also did get my pics to work, once I went out and took a look it was clear my vacuum line is bad and it is going to get replaced this weekend. I do not know if this is a common problem on our year vehicles but I will let you all know how it goes, and I will try and work those picks into that lean sticky.
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  #9  
Old 06-06-2011, 06:43 PM
bryanh bryanh is offline
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Default Re: check engine

Replaced vacuum lines, cleaned out the MAF and cleared the code so far it is still clear.
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