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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    I may download it and give it a try!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    well i was on a couple other forums and some people said it was better in som ways, it was free to download and seemed to be easy to get going, im not a computor wiz. Is tunerpro rt better? im trying to learn and get my truck idling like it used to!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Update, Im still battling this rough idle issue, I have returned the bosch 1300 scanner, I ended buying a moates cable and downloading winaldl so we can view live data at idle without any strange issues! Since I have the proper setup to view data what do I need to look for, I dont have a good...
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    With the age and mileage (185,000) I'm considering replacing them and cleaning the throttle body as maintenance!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Yea, the part that stumps me is it runs great any other time than at idle!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Update, I did check the fuel pressure right at the throttle body, it is 11psi!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    I played with the scanner more last night, I read a more detailed manual on bosches website, it does have a field service mode that mentioned crossing those two pins, it just caused the ses light to blink, sorta like when we read the codes with the paper clip.
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    I'm gonna check fuel pressure up at the throttle body, it was 11 psi before the filter , filter was changed about 3 years ago, could be clogged . Fuel pump was replaced about 3 or 4 years ago, I used a Delhi pump.
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    ok so i checked the settings on my scan tool, i could not find a way to remove that resisitor, i also could not find a physical resistor anywhere to remove!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    OK, I have purchased a bosch 1300 scan tool, it does read obd1 live data, but the issue is it seems the scanner itself causes issues with the engine idle speed, it idles higher with the scan tool, at one point in neutral it was idling at 1800 rpm! Is this normal? I did get the engine to idle...
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Ok i will see what i can find online, is the main thing that it shows live sensor data? i want to make sure to get a tool that is going to help me! If i can get set up with the proper scan tool what can i compare my readings to verify they are normal? Ive read codes and replaced a part to...
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Thank you for the reply, the only way i can read codes is the paper clip cross, then count the blinks of the ses light. I would say the rough idle is worse in closed loop but i can see the engine having a little shake at idle when warming up! I replaced the fuel filter about three years ago...
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Other than removing the intake is their a way to check it and be sure, I'm trying to keep from throwing money at it with no results ! Could I run a camera down the throttle body ?
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    I have replaced the Icm, it made no change, the rough idle happens consistently when it's warmed up
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    I have replaced the Icm, it made no change, the rough idle happens consistently when it's warmed up!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    It seemed to fit in the grommet pretty tight, I will double check it after work!
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Ok so I sprayed carb cleaner around the intake and around the throttle body, also sprayed around vacuum lines, anything I thought is related to vacuum, I never noticed a change in idle, could the intake be leaking on the bottom side? Can I test that somehow? Thanks
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    1990 c1500 5.7tbi Rough idle when warmed up Help Wanted!

    Hello all, first post here, I am needing some help with a rough idle issue I am battling! When warming up the engine runs smoother but has a noticeable roughness in it, once at operating temp it idles rough, even worse in gear with the ac running, it almost seems like a miss at times only at...

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