oil in intake manifold

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Coldhilux
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oil in intake manifold

Post by Coldhilux »

Hello,

so i just bought my ever first hilux a 1994 double cab 4x4 with i think 2.4 diesel no turbo engine, but i am having some problems with this vehicle, i removed the air intake filter since it is running a little bad and are quite underpowered, and there is oil inside the air intake which i think it is the reason why it is running faulty. while i drove it this evening it was really slow on uphill and smoked quit much with black smoke, any advise how to make this better?
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Mud Dog
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Re: oil in intake manifold

Post by Mud Dog »

Hi and welcome Qillaq. :thumbup:

The Toyota 2.4 Diesel (2L series) motors were notoriously robust motors but equally notorious for being sluggish, especially on up-hills or when towing. They are old diesel technology and only produced about 60KW. Pick-up trucks fitted with these motors were very underpowered by today's standards and this was even worse when fitted to a 4x4 truck with it's extra drag.

Not much you can do about that. As I recall, some guys retro-fitted turbo's to these motors and it improved the power somewhat but often at the expense of reliability and longevity of the motor. They weren't really designed to handle the higher compression from the turbo, however if the boost was set low, there were much fewer problems. Yours is now an old motor and I wouldn't go the turbo route. Perhaps an inter-cooler might help a bit. I doubt that chipping it is a real option because of the mechanical injection and timing.

Black smoke indicates over-fuelling while grey smoke indicates that you're burning oil. This could be from worn piston rings and worn bores, valve guides or a cracked head / damaged gasket, but you describe it as black smoke, indicating over-fuelling. Over-fuelling in diesels produces additional heat, not good for the motor. I hope that's all it is as this is a lot easier rectified than the other possibilities.

Normally when you're finding oil in the intake, it's from the crankcase breather. These are usually connected at the intake manifold on non-turbo motors but a lot of older vehicles had the crankcase breather connected at the air-box (air filter). Not sure about which it would be on your motor, but a little oil in the intake on an old motor with high mileage can be expected.

I suggest you start with radiator gas check to determine if there is a cylinder head or head gasket problem, also have a compression test done. The results will help point you in the right direction to find where the problem lie.

Best of luck. :winkx:
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Coldhilux
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Re: oil in intake manifold

Post by Coldhilux »

Thank you for at very good answer this will help alot, i am thinking i might also will see if it will help if i clean the intake manifold, but I see if it is running rich on diesel, is there anywere i can adjust the diesel?
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niclemaitre
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Re: oil in intake manifold

Post by niclemaitre »

There's an adjustment screw on the diesel pump, check the workshop manual in the "Manuals" section of the website
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Coldhilux
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Re: oil in intake manifold

Post by Coldhilux »

Thank you, I will look for the manual for this engine.
I looked closer today on the engine coolant and it was almost empty but the indikator were showing normal or few millimeters above this line.
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