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89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 06-27-2010, 10:56 PM   #1 (permalink)
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How to Adjust Idle RPM?

First, my truck idles MUCH too high. I don't have a tach yet, but it sounds REALLY high compared to other trucks. I am also seeing other tendencies that would indicate a higher idle than normal. First, when I crank it up, even when cold, it fires up faster than any truck I've ever owned...less than half a turn of the starter and it's running. Seems like this could be a sign, also, there is a big jolt/shock when switching into gear from Park or Neutral.

I have read about a screw to adjust idle, and I imagine I could find out where it is, but I'm really looking for advice from you guys about adjusting it. How much adjustment drops 100 rpm, etc...and tips or pointers you could give me would be great. Thanks.
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Old 06-28-2010, 10:41 AM   #2 (permalink)
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A fast start is the sign of a good engine. Looking at the injection pump from the finder side you see a long screw with a lock nut that the throttle arm hits at full throttle. That is the full throttle stop. On the back side (engine side) of the pump is an identical screw, that is the idle screw. Loosen the lock nut and back the screw out until you reach 750RPM. Then lock the nut.
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Old 06-29-2010, 04:57 PM   #3 (permalink)
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Originally Posted by Left out in the cold View Post
A fast start is the sign of a good engine. Looking at the injection pump from the finder side you see a long screw with a lock nut that the throttle arm hits at full throttle. That is the full throttle stop. On the back side (engine side) of the pump is an identical screw, that is the idle screw. Loosen the lock nut and back the screw out until you reach 750RPM. Then lock the nut.
what you said, yes indeed. unless the dern screw want to be a pain. mine was so i took a dremmel tool and started grinding away at the end of the screw until i got the rpm i wanted
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Old 06-29-2010, 05:40 PM   #4 (permalink)
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what you said, yes indeed. unless the dern screw want to be a pain. mine was so i took a dremmel tool and started grinding away at the end of the screw until i got the rpm i wanted
Your not fooling anyone. We know you and power tools.
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Old 06-29-2010, 05:42 PM   #5 (permalink)
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mine was easy to adjust. took about 5 min to find 700rpm. but it wasn't hard at all.
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Old 06-29-2010, 05:52 PM   #6 (permalink)
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Your not fooling anyone. We know you and power tools.
more power
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Old 07-04-2010, 11:50 PM   #7 (permalink)
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I used my pliers and bent the tab just a hair. worked perfect.
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Old 07-05-2010, 10:59 AM   #8 (permalink)
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I also don't have a tach, an after adjusting my power screw the truck idled high enough to be a pain at stop lights. I just used my ear, listened for a smooth quite idle, made sure the oil pressure was still good and called it a day. Make sure and put it in drive after you adjust it to make sure it's still smooth under a load with the A/C on.
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Old 03-06-2011, 11:35 AM   #9 (permalink)
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Quote:
Originally Posted by Left out in the cold View Post
A fast start is the sign of a good engine. Looking at the injection pump from the finder side you see a long screw with a lock nut that the throttle arm hits at full throttle. That is the full throttle stop. On the back side (engine side) of the pump is an identical screw, that is the idle screw. Loosen the lock nut and back the screw out until you reach 750RPM. Then lock the nut.
is there anyway you guys could post a pic i must be blind b/c im not seein it thanks to all !
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Old 03-06-2011, 12:02 PM   #10 (permalink)
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Look at the opposite end of the arm that the throttle linkage fastens to, it's just a threaded bolt with a lock nut that's hard to get to.
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Old 03-06-2011, 09:43 PM   #11 (permalink)
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Look at the opposite end of the arm that the throttle linkage fastens to, it's just a threaded bolt with a lock nut that's hard to get to.
oh duh right in front of me haha thanks guys appreciate it !!
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