You still need to verify fuel pressure. Do non fail this stride every bit it is central to TBI function. You need to route cheque with EGR disabled too.
Wiggling the throttle shaft from stop-to-end (i.eastward., the linked video) is checking centric play. Because of the circular shape of the throttle plate and the pocket-sized cavities created by the throttle shaft bore, you volition always find some corporeality of axial play in the shaft with the throttle open. That is, some play is normal increasing with throttle opening. Only, excessive axial play will result if the throttle plates are edge worn. In addition, in that location tin can occur excessive radial play in the throttle shaft if the throttle shaft bore is worn.
Referring to the image, the left illustration exemplifies zero vesture and is optimum.
In contrast, the correct analogy shows causes for both axial and radial play.
With the engine off, expect downwardly the throttle bores using a bright flashlight and inspect around the edges of the throttle plates with the throttle open up ~5� while wiggling the throttle, initially side-to-side (front-to-rear as illustrated at the right margin of the prototype) and and so cease-to-cease (as you lot did in the video).
Excess "centric play" is caused by throttle plate wear at contrary sides of the throttle plate where the plate intersects the throttle shaft. The throttle plate is worn noticeably narrower resulting in visible gaps between the plate and its bore in the area of the throttle shaft with the throttle almost closed. This allows the shaft to move excessively forth its axis - the plate does not remain centered in its diameter. If you find throttle plate side wear every bit shown in the right illustration, the throttle plate is worn out and idle speed stability may endure.
Excess "radial play" is acquired by throttle shaft bore article of clothing. Shaft bore wear will cause the "big gap" illustrated at the front and rear of the plate, between the throttle plate and its diameter equally y'all wiggle the shaft front-to-rear. If you notice backlog radial play, the throttle shaft bore is worn out, resulting in poor idle speed control and erratic TPS base of operations aligning.
Either of the foregoing faults calls for TB overhaul or replacement.
Use a DVM and cheque TPS voltage. Make upward a temporary three-wire jumper and so you lot can measure TPS voltage without piercing whatsoever wire insulation - a couple of Weatherpak connectors and the appropriate terminals will practise the trick. Measure the voltage alter every bit you slowly open up and shut the throttle with the ignition on, engine off. There should be a very consistent change in voltage with no erratic jumps. If the voltage is erratic, replace the TPS. You can use an ohmmeter for this test, but I do not recommend it. An ohmmeter tin indicate a false fail of a perfectly good TPS.
In add-on, check the MAP sensor using the criteria linked past Irish_Alley.
Topic: Stalling when barely pressing the throttle (Read 3450 times)
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