samerooo

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?

samerooo

Bump. Noone has any ideas? :(

Bert

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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Bert

360ci

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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'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!