Rough idle upon start up
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Amateur
Joined: Apr 2018
Posts: 29
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Hey so I just swapped the sensors gonna wait until morning to do a start test see if it clears up also found my airhat atop the throttle body was deformed not sealing properly replaced it might of contributed to my issue not sure but I checked long term and short term fuel trim long term shows in the -5.5 to -6.9 at acceleration it’s always ran kinda rich until warmed up since I’ve owned it but what is a normal range in those trims to look out for?
Veteran
Joined: Nov 2017
Posts: 488
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From: Texas
To me anyhow, trims will always run "a little" rich till the engine is up to operating temp. That being said, if you get long terms that stay consistently +/-10 n over while cold...or operating temp...you may/might/maybe have a number of problems...or may/might/maybe...not. As these engines age, things that make for compression, fuel n air delivery, exhaust, blah-blah-blah change as well and the ECM compensates for all this wear a little more each time. Case in point, I've been monitoring 'ol blue lately, cause I did some major body repair to the cab floor that took allot longer than I anticipated and as a bonus, the inspection is due...NOW. The battery was disconnected during this endeavour, so HAL went silent. Now, it takes all the "tests/cycles awhile to complete so you're ready for the taxman's inquisition and have the necessary sacrifices in hand to pay the state it's temple tax. I've been waiting, allot, for HAL to finish his cycles. He's still not opening the podbay door 
. Outta curiosity, I check the engine parameters while I'm there. I notice that while the short terms are okay, the long terms r runnin' +3/+5 on average (yeah the cat is shot due to the plenum oil bath conspiracy, but small miracle, it's not clogged!), BUT WAIT!!!, a week later, they're averaging -3/-7. Idles so smooth, runs great n has the roughly the same gas mileage it's always had since they started adding food to our gas...so, bottom line who knows?!? If she runs great n all seems well...
. Outta curiosity, I check the engine parameters while I'm there. I notice that while the short terms are okay, the long terms r runnin' +3/+5 on average (yeah the cat is shot due to the plenum oil bath conspiracy, but small miracle, it's not clogged!), BUT WAIT!!!, a week later, they're averaging -3/-7. Idles so smooth, runs great n has the roughly the same gas mileage it's always had since they started adding food to our gas...so, bottom line who knows?!? If she runs great n all seems well...
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Amateur
Joined: Apr 2018
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Alright so with the new tps and iac and airhat she seems to be running A1 even after sitting over night and for a few hours today so we’ll see how it goes over the next couple days thank you did the help guys
Legend
Joined: Nov 2014
Posts: 8,098
Likes: 318
To me anyhow, trims will always run "a little" rich till the engine is up to operating temp. That being said, if you get long terms that stay consistently +/-10 n over while cold...or operating temp...you may/might/maybe have a number of problems...or may/might/maybe...not. As these engines age, things that make for compression, fuel n air delivery, exhaust, blah-blah-blah change as well and the ECM compensates for all this wear a little more each time. Case in point, I've been monitoring 'ol blue lately, cause I did some major body repair to the cab floor that took allot longer than I anticipated and as a bonus, the inspection is due...NOW. The battery was disconnected during this endeavour, so HAL went silent. Now, it takes all the "tests/cycles awhile to complete so you're ready for the taxman's inquisition and have the necessary sacrifices in hand to pay the state it's temple tax. I've been waiting, allot, for HAL to finish his cycles. He's still not opening the podbay door . Outta curiosity, I check the engine parameters while I'm there. I notice that while the short terms are okay, the long terms r runnin' +3/+5 on average (yeah the cat is shot due to the plenum oil bath conspiracy, but small miracle, it's not clogged!), BUT WAIT!!!, a week later, they're averaging -3/-7. Idles so smooth, runs great n has the roughly the same gas mileage it's always had since they started adding food to our gas...so, bottom line who knows?!? If she runs great n all seems well...
. Outta curiosity, I check the engine parameters while I'm there. I notice that while the short terms are okay, the long terms r runnin' +3/+5 on average (yeah the cat is shot due to the plenum oil bath conspiracy, but small miracle, it's not clogged!), BUT WAIT!!!, a week later, they're averaging -3/-7. Idles so smooth, runs great n has the roughly the same gas mileage it's always had since they started adding food to our gas...so, bottom line who knows?!? If she runs great n all seems well...
