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-   -   03 Monte 3400 Struggles with starting when warm (https://montecarloforum.com/forum/monte-carlo-repair-help-8/03-monte-3400-struggles-starting-when-warm-55232/)

culater365 01-18-2016 11:53 PM

Hmmm, well ill see what I can find out. Might be a couple days until its in the double digits

plumbob 01-19-2016 08:04 AM

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 :thumbsup:

culater365 01-19-2016 10:24 AM

What values would help in diagnosis? I can hook up later and see if I can get them.

plumbob 01-19-2016 10:40 AM

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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