The EGR valve can become clogged with carbon, which causes the Check Engine Light to illuminate. This can result in moderate to severe misfires on acceleration and the EGR valve and passages will need to be cleaned.
Nissan Xterra Problem Reports
RepairPal Verified Nissan Xterra Problem Reports
The fuel injectors can fail and cause drivability problems. Often there is no Check Engine light and the failures can be caused by corrosion of the connector, clogging beyond the point of cleaning, and/or internal failures.
The fuel level sensor can fail causing erratic or inaccurate fuel gauge readings. The Check Engine Light may also illuminate. Nissan has recalled 2006 - 2008 vehicles only for this fuel gauge issue. For more information on the recall, please click here»
The coolant outlet on the front of the lower intake manifold may develop a coolant leak.
Valve clearances for this engine are shim adjusted and should be checked periodically to help maximize engine life. Another good time to check the valve clearances is when the valve cover gasket is being replaced.
A whining or buzzing type noise may develop from the timing chain area caused by excess slack in the secondary timing chains. Nissan has issued a service bulletin (NTB09-128) regarding this issue. Replacement of both secondary timing chains and their tensioner shoes will be necessary to repair this concern. As part of this repair, the engine oil and filter should also be replaced.
The distributor shaft bearing can become rusty, and seize causing the engine to stall or not start. The failed distributor will commonly require replacement.
Screws inside the intake manifold can become loose causing internal engine damage if they fall out completely. Our technicians report that using a strong thread locker on the power valve butterfly screws can help prevent them from becoming loose.