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03 Monte 3400 Struggles with starting when warm

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Old Jan 18, 2016 | 11:53 PM
  #11  
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Hmmm, well ill see what I can find out. Might be a couple days until its in the double digits
 
Old Jan 19, 2016 | 08:04 AM
  #12  
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Yeah, at this point we're pretty much just speculating. To know for sure, you need to hook up a scan tool like a Tech 2 that's capable of reading real time data such as fuel trim values, sensor voltages, upstream O2 sensor values etc....then interpreting it.
I don't want to mislead you and have you replace a bunch of parts that don't need to be, or get you worried that you're 'gonna break down. ICM's usually don't fail overnight and so long as all you have to do is touch the pedal to start you should be fine until you get the time and weather to check further.

Keep us posted
 

Last edited by plumbob; Jan 19, 2016 at 08:27 AM.
Old Jan 19, 2016 | 10:24 AM
  #13  
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What values would help in diagnosis? I can hook up later and see if I can get them.
 
Old Jan 19, 2016 | 10:40 AM
  #14  
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IMO, Fuel Trim data gives the most comprehensive statement about the health of your engine, but other factors need to be combined with it to narrow down the eventual diagnosis. I've watched several videos on YouTube presented by a guy called "ScannerDanner" whom IMO is one of the foremost experts in interpreting scanner data. He has several videos posted, all of which I've learned quite a bit from.

Here's one about Fuel Trim:
 




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