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Old 11-24-2009, 04:44   #1 (permalink)
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RPM doesn't drop after shifting when the Heater is on???

97 B2300, 5 spd.

This happens ONLY when the heater is on...

Let's say I am in first gear.. I go up to 3,000 RPM then hit the clutch to shift into second, after I hit the clutch, the RPM sticks at 3,000 RPM and doesn't go back down unless I slow down to like 10MPH and getting ready to stop at a stoplight or something.
If I'm about to go down a hill, I usually just take it out of gear and leave it in neutral while rolling down, but when I hit the clutch, it stays at whatever RPM I was at before, defeating the purpose.

The weird part is that when it is happening, and the RPMs are stuck at 3,000+, I can turn the knob of the heater to the off position, and the RPMs drop instantly back down to idle (800-900).

When the heater is off, I have no problems at all. This is really beginning to get bad because it's getting colder and I need my heater to be on. Switching into a higher gear while I'm already sitting at 3-4k RPM isn't good at all. It grinds into gear often.

Does anyone have any idea what it could be?
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Old 11-25-2009, 04:22   #2 (permalink)
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Re: RPM doesn't drop after shifting when the Heater is on???

Bump. Noone has any ideas? :(
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Old 11-25-2009, 08:11   #3 (permalink)
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Re: RPM doesn't drop after shifting when the Heater is on???

When you turn the heater on, does the A/C come on? If it's in defrost or mix it will. The IAC might be bad. Try cleaning the IAC (Idle air control) valve.
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Old 11-25-2009, 18:36   #4 (permalink)
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Re: RPM doesn't drop after shifting when the Heater is on???

I agree, check the IAC. Not sure if your truck has a throttle position sensor, but it's a replacement item as well. Some IAC's can be cleaned with carb cleaner, soak it, then wipe off with a cloth. Just DO NOT move the plunger more than 1/4" or you'll have to buy a new one for around $40.
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