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  #21  
Old August 18th, 2015, 08:02 PM
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Originally Posted by Jymmiejamz View Post
Except that time it didn't at Wintergreen.
Fortunately I carry around a spare Land Rover technician for just such occasions.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #22  
Old August 18th, 2015, 08:03 PM
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Nah... I like hunting in the dark!
Start with the most common item and work your way to the least common.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #23  
Old August 18th, 2015, 10:27 PM
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Brent McDonald
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great info folks, thanks.
I have not had a chance to go after the stepper motor or MAF yet but did test the fuel pressure tonight. At normal operating temp the results were as follows:
1. ignition in the on position: 38
2. engine on and at smooth idle: 30
3. engine on, smooth idle and vacuum line from fuel pressure regulator: 38-40
4. Engine under load: jumped up appropriately

so looks like all those are okay, will check to see what the results are when the engine is cold in the morning.
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  #24  
Old August 19th, 2015, 10:02 AM
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Brent McDonald
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and the winner is (or for the moment appears to be)……….IACV!
tested fuel pressure this morning and all looked okay. Started it and it rand terribly. Took out the IACV and gave her a good cleaning. Put her back in and she fired right up with a smooth idle. now, lets see how long it lasts….
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  #25  
Old August 19th, 2015, 10:06 AM
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What kind of cleaning? with a towel/cloth? Any wet solution?

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Took out the IACV and gave her a good cleaning. Put her back in and she fired right up with a smooth idle. now, lets see how long it lasts….
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  #26  
Old August 19th, 2015, 10:10 AM
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I used carb cleaner and a towel. Sprayed it down really well and just scrubbed it with a towel. Got a fair amount of blackish junk off it. I also shot a squirt into the plenum and cleaned that with the towel as well. Let them dry and then reconnected. Total procedure took me five minutes including dry time.
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  #27  
Old August 19th, 2015, 10:15 AM
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Thank you. I will do that this afternoon when I get home from work. I drove my D today and it had wet/damp start & was sputtering (but okay now)
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  #28  
Old August 19th, 2015, 06:05 PM
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What kind of cleaning? with a towel/cloth? Any wet solution?
A tooth brush works well too.
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  #29  
Old August 20th, 2015, 11:59 PM
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so, looks like I am partly there. Runs a lot better but still stumbles some. I am going to run injector cleaner through my next tank (royal purple) and likely will go ahead and replace the IACV.

Do I need to reset the computer after replacing the IACV?
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  #30  
Old August 21st, 2015, 07:49 AM
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No. Just be sure the connector is fully seated. If it still runs poorly after that the next thing to look at is ignition.
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  #31  
Old August 21st, 2015, 07:59 AM
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Stumbles at idle or at certain RPM range?
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  #32  
Old November 30th, 2015, 08:17 PM
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I'm having a similar situation with my 3.9 V8. After reading this thread and a couple others I started with cleaning the IACV and MAF. That didn't solve the issue. I went ahead and replaced both the MAF and the IACV today. Had to adjust the idle up some after replacing the IACV and it runs ten times better. Once the engine cooled off it started and stumbled just a bit and then was great. May have to adjust the idle a bit higher tomorrow. However, I am still experiencing a slight stumble under load.

Any thoughts?
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  #33  
Old November 30th, 2015, 08:30 PM
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Originally Posted by Mpfish82 View Post
I'm having a similar situation with my 3.9 V8. After reading this thread and a couple others I started with cleaning the IACV and MAF. That didn't solve the issue. I went ahead and replaced both the MAF and the IACV today. Had to adjust the idle up some after replacing the IACV and it runs ten times better. Once the engine cooled off it started and stumbled just a bit and then was great. May have to adjust the idle a bit higher tomorrow. However, I am still experiencing a slight stumble under load. Any thoughts?
Air leak.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #34  
Old November 30th, 2015, 08:35 PM
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Brent McDonald
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My problems ended up being more extensive than initially thought. I had severe significant issues including a bad MAF and problems with my 14CUX. The truck would run fine until it got out of the closed loop cycle and then would have major problems and flood the engine as the fuel air pictures were wrong. Replacing the MAF and computer fixed it and now it runs pretty well.
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  #35  
Old November 30th, 2015, 09:12 PM
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Quote:
Originally Posted by leastonce View Post
Air leak.
Air leak huh? I replaced the intake hose while replacing the MAF and IACV. Typical 10 min fix turned into an hour when the OE hose that was stiff as a brick cracked.
Where else could it be leaking in from? Where would the leak come from that would cause the stumble? Any leak at all from opening of air filter all the way to the intake at the top of the engine or only after a certain point? Just want to try and narrow it down.
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  #36  
Old November 30th, 2015, 10:08 PM
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Quote:
Originally Posted by Mpfish82 View Post
Air leak huh? I replaced the intake hose while replacing the MAF and IACV. Typical 10 min fix turned into an hour when the OE hose that was stiff as a brick cracked. Where else could it be leaking in from? Where would the leak come from that would cause the stumble? Any leak at all from opening of air filter all the way to the intake at the top of the engine or only after a certain point? Just want to try and narrow it down.
Any air leak after the maf would cause the ECU to not know what the actual air load was.

The big hose if you are still using it probably leaks air. Also don't forget the side hose that the IACV uses.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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