Q: Valve lash is good,check rod bearings. Engine taps under load.doesnt tap when in neutral and revving engine. Timing off 1 tooth?

asked by on

Valve lash good,rod bearings good. Engine taps when under load. Doesnt do it when in neutral and revving engine.engine has very slight misfire.Could timing be advance one tooth?

My car has 147243 miles.
My car has a manual transmission.

Hello. Check intake vacuum at idle to "guess" as to the status of the timing. If below factory spec., for example if as low as 15 inches or so (vac. gauge reading), you might be off a tooth. Really, the only way to tell for sure is a visual examination of the crank and cam positions. If there is really a misfire, it should be setting an engine code that is downloadable. I would only be suspicious of timing as a cause if you recently changed the belt or the belt is overdue for replacement and the engine has been heavily loaded, loaded enough to force such a jump. In your circumstance, you should start with a comprehensive ignition and fuel system diagnosis to see what sort of issues might be causing the misfire. YourMechanic can assist you with this if you would like.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Valve lash is good,check rod bearings. Engine taps under load.doesnt tap when in neutral and revving engine. Timing off 1 tooth?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Valve cover gasket 2012 Ford F-150

Hi - Here at YourMechanic, click here for guidance on how to make this repair. There are many other aftermarket sources for information on how to replace valve cover gaskets: the factory Ford Service Manuals, vendors of aftermarket service manuals...

Q: Bad ignition switch or main relay?

Many of the 1998 Accords were recalled by Honda for ignition switch and interlock defects. In your circumstance, the first thing to do is confirm whether applicable recalls affecting your vehicle were in fact completed, by you or any prior...

Q: Q: Cylinder 3 misfires.

Hi there. From the description you have provided, a lot has been done to overcome your vehicle's engine misfire issue. Due to the many possibilities, that can cause a cylinder misfire (ie; spark plug, ignition coil, fuel injector, vacuum leak,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...