Parts for your 1999 Daihatsu Gran move-Manifold gasket

1999 Daihatsu Gran Move manifold gasket — purpose, care, and when to replace

A manifold gasket is absolutely fitted to the 1999 Daihatsu Gran Move (G300 series, commonly running the HC‑E/HC‑EJ 1.5‑litre petrol engine). Technical references that list it include the Daihatsu factory Workshop/Engine Repair Manual for HC‑E/HC‑EJ and the Daihatsu/Toyota Electronic Parts Catalogue (EPC) for G301/G303 Gran Move/Pyzar, which both show intake manifold and exhaust manifold gaskets as standard service parts. Trade data sets such as Autodata also specify manifold fastener torque procedures for this model, reinforcing that the gaskets are present and serviceable items.

On this Gran Move, the intake manifold gasket seals the manifold to the cylinder head to keep unmetered air out and maintain stable idle, smooth running, and proper fuel trims. The exhaust manifold gasket seals hot gases as they exit the head, preventing ticking noises, soot marks, and fumes under the bonnet. In short, the gaskets keep the air in where it should be, and the exhaust out where it shouldn’t.

They’re not a scheduled replacement like a timing belt, but they do age with heat cycles. Typical clues they’re on the way out include a hiss or high idle (intake leak), a sharp tick on cold start or a whiff of exhaust in the cabin (exhaust leak), rough running, or fuel economy dropping off. Any time the manifold is removed, a new gasket should go in.

For servicing, a careful look around the manifold flanges is worth adding to routine checks. Under the bonnet, listen for hissing or ticking, and look for black sooty tracks near the exhaust flange. A quick spray test around the intake joints (with appropriate care) can expose vacuum leaks by altering idle.

Replacement tips the workshop manuals agree on: work on a stone‑cold engine