Question about 1998 Toyota Celica

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Turbo doesnt engage

Cant accelerate hard without cutting fuel supply

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The turbo never "engages". The turbo spins all the time, but the amount of exhaust gas driving it is adjusted by the wastegate.

The problem you are experiencing could be due to the wastegate's vacuum tube being disconnected. The wastegate is meant to open as the inlet manifold pressure increases, so that the turbo spins less and doesn't compress the air too much. It could also be the result of a faulty sensor, but check the vacuum tubes first. Your wastegate actuator is fitted just behind the turbo. If the pipe has come off recently, you should be able to see a clean section where it's meant to be joined to the actuator. The disconnected pipe should be fairly close by. Again, the pipe should be connected to the inlet manifold though from memory I think this is one of the difficult to reach pipes on the back of the engine.

As a side note, the turbo guage on the dashboard is very poor. Even if only for the sake of diagnostics, you should get a cheap direct vacuum driven guage.

Posted on May 17, 2009

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Turbo keeps cutting out, mainly on incline or declines, could this be fuel filters.


Could be one of many things. First off if you can"t remember the last time you changed the fuel filter (there's only one, and it's in plain sight) then do it. It should be replaced every 20k miles. If i were to guess though I would start to look at the turbo actuator system. The turbo is engaged by vaccuum. there's a vac pod on top of the turbo with a vc line going to it. At idle, when you don't want boost there is no vaccuum sent to the actuator pod. The pod is connected to vanes in the turbo that direct the exhaust flow either into or around the blades. Under full throttle vaccuum is sent to the pod to move the vanes inside the turbo to direct exhaust into the blades causing it to spool up and give the car some zip. I have replaced quite a few of the pods. Here"s some more to think about...

Vac is generated by a vac pump off the back of the camshaft. Check to see if there is at least 15" of vac.

VW doesn't provide a port to measure boost. Anywhere. In my opinion all turbo cars should have a boost gauge. Either install one- it's not hard, or get someone with a VAG.com type scanner and see what the boost is. Stock I think was a lazy 13psi under acceleration

Use a vac pump, hook it to the line going to the vac pod on turbo and make sure it HOLDS vac.

other poss. causes- vac leak somewhere else, check all lines

turbo crusted up inside

something else weird.

When you find the problem please let me know. Im curious...

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