Hi!

Just this short question:

I am working on the engine (it has a very rough idle), and for a short time I need to start it occasionally to see if the problem has changed.

Can I start the engine when black engine cover is off? It is also the housing for the air filter, so no air filter in this case: the throttle body is open to the air.

Thanks!

Yes you can.

Just don't do any work in the middle of a sandstorm!

Hi!

Just this short question:

I am working on the engine (it has a very rough idle), and for a short time I need to start it occasionally to see if the problem has changed.

Can I start the engine when black engine cover is off? It is also the housing for the air filter, so no air filter in this case: the throttle body is open to the air.

Thanks!

yes, is also common to do it on the shop to inspect(mechanic) the engine while another (asistant) accelerates, engages the brakes, turns the wheel etc. if you would have visited a mecanic shop you would also have seen a bit of garden hose cut off (they used it as a stetoscope to pin point engine noise) a vacuum gauge (to check engine health) and a magnifing glass (to check spark plugs)

in short, remove it, and have another operate the engine, check for any tipe of sound, remove and plug vacuum lines and note engine behavior, if noise are present pin point them with a hose and run the engine for a couple of minutes without load @ max torque RPM and note vacuum reading and take o pic of all the plugs in the same order they are on the engine.

if its mechanical, thats enough to tell what is going on (post the pics, i´m pretty good in reading them)

yes, is also common to do it on the shop to inspect(mechanic) the engine while another (asistant) accelerates, engages the brakes, turns the wheel etc. if you would have visited a mecanic shop you would also have seen a bit of garden hose cut off (they used it as a stetoscope to pin point engine noise) a vacuum gauge (to check engine health) and a magnifing glass (to check spark plugs)

in short, remove it, and have another operate the engine, check for any tipe of sound, remove and plug vacuum lines and note engine behavior, if noise are present pin point them with a hose and run the engine for a couple of minutes without load @ max torque RPM and note vacuum reading and take o pic of all the plugs in the same order they are on the engine.

if its mechanical, thats enough to tell what is going on (post the pics, i´m pretty good in reading them)

Thanks for the answers.

Cepheuz, you mean pics of compression and vacuum readings in plug holes?

I narrowed down to the possible fault of the crankshaft (=speed) or the camshaft sensor. I'll try to clean / re-fit them. If still nothing, I will replace them. If none of this helps, I will buy a compression kit, and check cylinder compression.

Id be checking compression on cylinder four and EGR system on a BBY for a rough idle, is it specific to a cylinder?

Does have cylinder recognition so diagnostics will tell you what cylinder is playing up.