Bought myself a feeler gauge and will attempt to adjust base idle. My big problem is that I do not know where the locations of the parts are:


Idle Linkage Rod - I assume this is the screw like thing with plastic ends that attach to ball like joint.

Cable Drum end stop?? I assume the cable drum is the round drum with groves where the throttle and kick down cable sits on.

Throttle Lever??


Adjustment screws??

A picture is worth a 1000 words. Anywhere I can find such a picture that names these parts??



Setting Base Idle Specs and TPS on Bosch LH2.4-Equipped Cars . [Adapted from Volvo Service Manual 32043/1]

Cleaning the Throttle Body: See the discussion in Engine:Performance for more information

Adjusting the LH2.4:

1. Adjusting Idle Linkage Rod.

Ensure that when the cable drum is pushed off its endstop with a 2.5 mm feeler blade, the gap between throttle lever and adjustment screw is from 0.1 and 0.45 mm. (This is the adjustment screw that mounts on the throttle lever, not the adjustment of the larger nut that attaches the lever to the throttle plate shaft). To achieve the above spec, adjust the throttle link rod (ball-socketed connection rod between drum and throttle lever)

2. Checking the Throttle Body (Plate and Throttle Position Switch) Adjustment

Connect an accurate tachometer then warm up the engine. Let it idle in Park with a/c off. Pinch off the hose between the air intake and the IAC valve (don’t damage the hose with something sharp!) Idle speed should drop below 500 rpm, or the engine may stop: both are normal. If idle speed does not drop, adjust as below.

3. Adjusting the Idle Speed

On the front side of your throttle body, there is an adjustment screw. Loosen the lock nut. Start the engine and turn the adjustment screw until idle is 480-520 rpm. Switch off the engine and tighten the lock nut while holding the adjustment screw so it doesn't turnS