how many cranks before it starts?

[MJ86YJ90]

To me it seems like it takes a little too long for the mj to start. I turn the key seems like it cranks about 4 times before it kicks over and starts. Does this seem about norm?

[Geonovast]

4 cranks is normal.

[MJ86YJ90]

great i was just praying something else wasnt breaking the H2 turns over as soon as i hit the key. but now i know i have a good battery and alt 4 cranks is good for me

[Geonovast]

The H2 isn't 24 years old and has a much smarter computer.

[jpdocdave]

All the renix jeeps do it, I once had a customer try to fix that, replaced every part under the sun down to the computer. The renix jeeps take a couple extra cranks to start, the HO jeeps do not though, if its 91 or later there's a problem

[airspeed]

My 88 2.5 cranks 4-5 times before it will start. In the cold it will idle slow for about 5 seconds then ramp up to a fast idle. The engine seems to be fairly smooth and driveable, even when cold.

[dunl]

My 89 would crank for what seemed forever compared to normal engines.....drove completely fine.

[summerinmaine]

IIRC from reading the Renix manual there are two "modes of operation" that proceed in sequence: "Key on" mode and then "crank" mode. During the key on mode, the fuel pump relay is energized and the ECU completes the circuit for up to three seconds to prime and build up pressure in the fuel log. Then, once crank mode is engaged, the ECU determines if proper cranking speed is achieved, and "learns" the location of cylinder 1 or 6 to begin the firing order and the injector sequence.

 

One consequence is that if you turn the key from "off" straight to the start position, it may actually take a bit longer to start because you rushed the priming of the fuel log, and might have a lean F/A mixture for the first few ignition signals.

 

I just finished reading the manual last week, so I hope I retained that info correctly. :smart:

[knever3]

^^^^ I agree if you prime the ignition aka fuel pump before cranking it starts faster.

[SW86]

yup mine does it about four times too and i always turn my key on first before i start. pretty much just wait for the last "click" or noise, before attempting to turn it on.

[Matt1971]

My 87 usually starts in 5-6 cranks, always starts and runs great. So if it's starting after 4 cranks your good.

[james750]

My MJ takes 4-8 turns to start, always has. The 97+ XJ's (have three of them in the family) used to always start on the first 2 cranks, but now two of them have fuel pumps that do not prime to operating PSI at key on and they take 10-20 cranks to start if the pressure on the fuel rail has depleted. If they were mine (these ones are my parents) I would have replaced the pump, but they have been running it on the old fuel pump now for about 3 years on one of them and 1 on the other with no other problems.

[Blue XJ]

My 87 usually starts in 5-6 cranks, always starts and runs great. So if it's starting after 4 cranks your good.

 

 

x2 except mines a 90.

[btm24]

Its kinda like warming up the glow plugs in a diesel truck

 

Brandon