Slow starting?

[Redbird]

My 89 MJ seems to run very well but starting seems to be strained. It takes 3-4 seconds for the engine to turn over. Is this normal for the 4.0L or does something need to be replaced?

[Eagle]

"Turning over" is the starter spinning the engine. You mean it takes 3 or 4 seconds for it to fire.

 

That's normal with the Renix system (which is what you have in an '89).

[Redbird]

"Turning over" is the starter spinning the engine. You mean it takes 3 or 4 seconds for it to fire.

 

That's normal with the Renix system (which is what you have in an '89).

Thanks, one less thing to worry about. ;)

[jpdocdave]

ya, normal. many years ago, before i knew much about jeeps, i had a customer have us try to fix that problem in her renix era xj, man we replaced everything, fuel pump, pressure regulator, tune up, fuel filter, sensors.....all that and there was no problem, all renix jeeps take a couple extra cranks than all other vehicles.

[Automan2164]

On the same page, on the HO's an excessive crank, like cranking for 5-10 seconds, is the CPS correct?

 

Rob L.

[jpdocdave]

On the same page, on the HO's an excessive crank, like cranking for 5-10 seconds, is the CPS correct?

 

Rob L.

 

more likely the regulator in the tank, pressure leaks down causing hard/long start condition.

[Eagle]

Especially with a Renix MJ (or XJ), turn on the key and then wait until the fuel pump stops running before engaging the starter. That way, you know the fuel rail is fully pressurized.