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

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  #26  
Old 11-24-2009
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lol. How's your tranny? My truck didn't throw those codes, but I was getting the same ****ty mileage. Since you have access to a MODIS, I assume you have access to tests and procedures for your truck. Try doing the Stall Speed Test. Something in your transmission could be ****ed.
Did you read this?
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  #27  
Old 11-24-2009
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so your mileage was fine before you worked on it? I have done this many times before. You now need to back up and look at all things YOU did.

I also agree that you should toss in a new set of plugs first. I have always sea foamed on the old plugs then changed the oil and replaced the plugs.
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  #28  
Old 11-24-2009
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How do you do a Stall Speed Test? Brake stand?

You should check and make sure all your sensors are plugged in. A bad 02 sensor will not always throw a code.
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  #29  
Old 11-24-2009
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How do you do a Stall Speed Test? Brake stand?

You should check and make sure all your sensors are plugged in. A bad 02 sensor will not always throw a code.
Let me see if I can find the procedure. I had it somewhere but I don't remember where it is.
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  #30  
Old 11-24-2009
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I think a stall speed test is when you cut the engine while in drive and see how far you coast. You should be able to see if the tranny is all screwed up. This is just an assumption though, never done it myself.
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  #31  
Old 11-24-2009
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I think a stall speed test is when you cut the engine while in drive and see how far you coast. You should be able to see if the tranny is all screwed up. This is just an assumption though, never done it myself.
ummm....HELL NO. I'm trying to find it...you're not even close though.
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  #32  
Old 11-24-2009
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ummm....HELL NO. I'm trying to find it...you're not even close though.
Hahaha I totally just looked at it and typed the first thing that came to my mind.
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  #33  
Old 11-24-2009
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  #34  
Old 11-24-2009
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It has to deal with revving the engine between a specified RPM range. I don't remember what the exact ranges are.

Basically, you set the parking brake, put your left foot on the brake, and you rev the engine in D,R,2,1 and see if the specified RPM is reached in each range. If you rev over the RPM range in say, D, the chart tells you what the possibilities are. The clutches in my trans are shot.
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  #35  
Old 11-24-2009
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since your truck is an OHV per your avatar, the elbow doesnt apply to you

check the intake gaskets with carb clean for a leak, check all vacuum lines etc and clean the MAF sensor

also, on 98-00 there was a TSB for premature catalyst failure that consisted of a pcm update that shuts off the downstream o2 sensor reading. it was done to mine as i have no cats and no cel. when i use ids or ngs, the downstream o2 is flatlined, it should NEVER switch (rich/lean) like the upstreams do
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  #36  
Old 12-01-2009
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ok so i changed the plugs and i still have bad milage
my tranny is manual so would this still be a reason?
next i will clean my MAF but other than that what should i do?
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  #37  
Old 12-01-2009
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Get a gauge and test the pressure on the fuel rail with the engine running and right after you shut it off.
If it leaks down fast when the engine shuts down , look for 1 or more injectors stuck open.
Pull the dipstick . Does it smell like gasoline ?
Crawl under and look where the bell housing meets the block and where the trans meets the bell housing.
Is there a wire pinched in there ?
Any wires laying near the exaust pipes ?
Do a voltage check on the TPS ?
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  #38  
Old 12-10-2009
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Wow. lol The PO 171 code is for the little elbow that gets cracked causing a vaccuum leak, which can result in bad gas mileage. But as for 8 mpg... mine doesnt do much better. lol
Could you further explain what elbow you are talking about?
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  #39  
Old 12-10-2009
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What o2 sensors do you all suggest?
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  #40  
Old 12-10-2009
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ive gotten 3 02 sensors and none of them are showing a data stream.... they all read 0
any ideas from here?
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  #41  
Old 12-10-2009
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Check the wiring to make sure its not crimped or cut off somewhere along the line.
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  #42  
Old 12-11-2009
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Dose anyone know how I can check the wiring? Like how many volts are sent to the o2 sensor? And is there a way I could put a charge of a couple volts to the o2 sensor plug to check and see if it shows up on the data stream with out harming or effecting the computer of the truck?

Thanks
-Andy
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  #43  
Old 12-14-2009
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ok so i found a leak inbetween my upper and lower intake and i need to replace those gaskets..... so i was thinking sense i want new heads i might as well do it all at once..... so my question is what heads do they make and where can i get them?

Thanks
-Andy
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  #44  
Old 12-14-2009
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Bump? Anyone?
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  #45  
Old 12-16-2009
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anyone have a doner explorer with a 5.0 in it? i think this will have a better pay off
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  #46  
Old 12-19-2009
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ok i replaced my throttle body gasket yesterday because they were leaking
but now its running real rough and i have no idea why, i put everything back and everything is to spec.
dose anyone have an idea on what could be wrong?

Any help would be greatly appreciated because i need to drive 200 miles to my in-laws for x-mas and i don't want to risk breaking down

Thanks
-Andy
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  #47  
Old 12-24-2009
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well i would suggest starting a new page cause i have no clue where you are at. but when i had those two codes the pCV hose wasnt connected so i just replaced it with radiator hose and its all good. my guess is its MAF related since you got both codes at the same time.
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