Q: What wrench size or type do you need to disconnect the egr tube from the exhaust manifold on a 1991 Nissan truck with a 2.4 liter 4 cylinder engine?

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What engine???????? You should refer to repair manual if not familiar with auto repair and understand the terminology before attempting Remove nuts holding exhaust manifold to cylinder head & remove nuts/bolts holding exhaust manifold to exhaust pipes Use new exhaust manifold gaskets and install the new manifold securing the manifold to cylinder head (may need to but new nuts and or bolts) by "snugly" tightening manifold to cylinder head if not refering to repair manual

screwed into your exhaust manifold.

on the passenger side of the engine below the exhaust manifold on both 6 and 4 cylinder models on the passenger side of the engine below the exhaust manifold

your oxygensensor is bad ,its screwed in to your exhaust manifold, about 30.00

there are two cat one iswielded with the exhaust manifold and the 2nd is connected to the exhaust manifold with the o2 sensor leading to the exhaust.

It is in the exhaust pipe right after the exhaust manifold.

follow your exhaust from your exhaust manifold and you will find.

The fuel mixtue has gone lean.

you have 3 of them ,1in each exhaust manifold and 1 in one of the pipe leaving the exhaust manifold.

its screwed into your exhaust manifold.

its screwed into the exhaust manifold,undo wire and unscrew at manifold.

10000 dollars

one is in the exhaust manifold, one goes into converter

normally they are located on the exhaust. you may have three. on the manifold and on the exhaust pipe itself...

the exhaust side is by the exhaust manifold,intake side is next to fuel injectors.

o2 sensors are in the exhaust Usually in front of the catalytic converter near or in the exhaust manifold.

The exhaust manifolds on a 2000 Xterra are bolted onto the side of the engine heads. The manifold carries the engine fumes to the exhaust pipes.

not sure........nissan part # 08918-2081A

first its an egr valve and its between the exhaust manifold and the exhaust pipe itself usually on the passenger side

The firing order has 8 firing ports which there are four on the intake manifold side of the engine and four on the exhaust side. So The firing order for the 1984 Nissan is 1-2-3-4-5-6 Number 1 cylinder is the forward most cylinder on the passenger side.

in the exhaust manifold. is there any place to buy a used one?

no such thing ,you need to reword your question,exhaust manifold is bolted on the right side of engine and intake manifold on left side,under carburator.

underneath the intake manifold, bolted to the cylinder head.

It is located in the exhaust manifold{s}- It will have 1 for a four cylinder, and 2 for a V6. You will need a special socket available from just about any auto parts store.

No you don't need to do either of those but you do need to disconnect the oil sending unit to be able to drop the starter out of the frame.