Mitsubishi Montero & Montero Sport This sport utility vehicle offers more size than the other Mitsubishi SUVs, but manages to keep a sporty look and comfortable feel, unlike many larger SUVs.

Baffled

  #1  
Old 10-16-2018, 01:41 PM
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Join Date: Oct 2018
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Default Baffled

Hello friends. First time poster here. Iím a mechanic have been for years but Iím a little stumped. Friend has a 2001 Montero sport that very intermittently, like every couple months, seems to go into a limp home situation. Truck wonít go past 15 mph throttle wide open, no rpm increase, no stall, truck doesnít die just wonít go. Problem always fixes itself before I get the truck and drives perfect. Has a p0421 no other codes so probably needs a cat but Iíve never seen this cause this odd drivability problem. Well maintained truck fresh tune up excellent condition 167k. Anybody had and solved this? Truck drives perfect for me and issue is very intermittent. Weather has no effect itís just out of the blue truck loses all its power but doesnít die or kick cel. Biggest problem is I canít recreate it! Runs perfect with me so all tests show all good. Crazy just thought maybe someone knows something lol
 

Last edited by Michael Reese; 10-16-2018 at 01:48 PM.
  #2  
Old 10-18-2018, 12:22 AM
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Join Date: Oct 2004
Location: Washington State
Posts: 1,311
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The P0421 will not cause that. Most likely its some transmission/transfer case sensor malfunctioning. It's too bad that you can't find a relationship of the malfunction to the weather or some other factor.
One idea is to check if there are any transmission related codes stored. It will not show up as "Check Engine" light, but as an intermittent flashing orange center differential light. You can "short" to ground a pin on the OBD connector and see what transfer case codes show up. I'm attaching a portion of the transfer case diagnostics section of the FSM for you. It describes how to get transfer codes out. There is also a section that describes various malfunctions that will cause limp mode/speed limitations. I hope you find this helpful in identifying the issue.
 
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