1989 Nissan Pickup Z24 Question
1989 Nissan Pickup Z24 Question
i just rebuilt my 89 z24 and replace all vacuum lines, gaskets and timing chain and gears. the engine fired up and runs great except the exhaust manifold gets red hot! v does anyone know what could be causing this?
Re: 1989 Nissan Pickup Z24 Question
Lean condition, also could be out of time.
Re: 1989 Nissan Pickup Z24 Question
ya i also noticed that it is getting really bad fuel mileage. and i think it is a timing issue, but it is idling very clean. if anyone has any ideas or suggestions it would be greatly appreciated. thanks
Re: 1989 Nissan Pickup Z24 Question
Wrong coil wire?
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jdansmith
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- Car: 2008 Sentra 2.0S, 91 Sentra 1.6DHOC, 89 Hardbody Z24
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Re: 1989 Nissan Pickup Z24 Question
Did you keep the secondary air pump integrated? Yours is the Z24i right? Timing and mixture would be the first suspects, a significant vacuum leak would cause a lean condition. Did you set the valve lash correctly. 0.012 hot intake and exhaust? During your rebuild was a 3 angle valve job preformed? Below is a breif explanation of the secondary air injection and their relation to glowing exhaust, timing or valve lash would have to be way off imo.
Secondary air injection (commonly air injection, colloquially smog pump, trademark Air Injection Reactor) is an automobile emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream. The exact mechanism by which exhaust emissions are controlled depends on the method of injection and the point at which air enters the exhaust system. The first systems injected air very close to the engine, either in the cylinder head's exhaust ports or in the exhaust manifold. These systems provided oxygen to oxidize (burn) unburned and partially-burned fuel in the exhaust before its ejection from the tailpipe. There was significant such unburned and partially-burned fuel in the exhaust of 1960s and early 1970s vehicles, and so secondary air injection significantly reduced tailpipe emissions. However, the extra heat of recombustion, particularly with an excessively rich exhaust caused by misfiring or a maladjusted carburetor, tended to damage exhaust valves and could even be seen to cause the exhaust manifold to incandesce.
Secondary air injection (commonly air injection, colloquially smog pump, trademark Air Injection Reactor) is an automobile emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream. The exact mechanism by which exhaust emissions are controlled depends on the method of injection and the point at which air enters the exhaust system. The first systems injected air very close to the engine, either in the cylinder head's exhaust ports or in the exhaust manifold. These systems provided oxygen to oxidize (burn) unburned and partially-burned fuel in the exhaust before its ejection from the tailpipe. There was significant such unburned and partially-burned fuel in the exhaust of 1960s and early 1970s vehicles, and so secondary air injection significantly reduced tailpipe emissions. However, the extra heat of recombustion, particularly with an excessively rich exhaust caused by misfiring or a maladjusted carburetor, tended to damage exhaust valves and could even be seen to cause the exhaust manifold to incandesce.