Slow cranking - JeepForum.com

 
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post #1 of 6 Old 12-27-2012, 07:58 AM Thread Starter
vjz
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Slow cranking

1998 Cherokee Sport 4x4 (4.0L AW4 automatic)

So, I recently posted about a possible bad NSS.

I am not sure that is the problem.

When my NSS problem acted up on Christmas Eve day, the Jeep started the day by cranking slow and not wanting to start. It started a few tries later, and that issue went away.

Well, after I had it towed home from a supposed bad NSS, I was able to start it again. However, I didn't drive the Jeep at all until I went to get in it last night to leave. It cranked a few, morose sounding times and eventually clicked.

It sounds like a bad battery, but my battery is new. So, I figured this morning I'd try to jump it or push it into the garage and yank the starter off to take it to the parts store to have it tested. But, I went out to start it and it cranked slowly but started on the first attempt to start. It is currently running to warm up.

Bad solenoid? Worn out brushes? Bad gear?

Or could it be bad contacts from various electrical connections? That's free and easy to fix and I'll do that this morning as well.

Just wanted to see what issues others have had with this type of problem.

I'm going to add an additional ground to the Jeep as well.

All help is appreciated.

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post #2 of 6 Old 12-27-2012, 08:49 AM
CJ7-Tim
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A faulty NSS would result is the starter doing nothing. Slow cranking is a starter issue, or voltage issue.

You need to run some tests. Just because the battery is new does not mean that it is good. Have the battery, starter, and the alternator Load Tested for proper function in a test machine that applies a simulated work load. Handheld testers are inaccurate and will often pass faulty parts.
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Clicking and not starting is usually a low voltage issue from:
  • leaving the lights on
  • a failing battery
  • a failing alternator
  • dirty or loose wire connections
  • internally corroded battery wires
Perform routine maintenance of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, and from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to.

Jeeps do not tolerate low voltage, bad connections, or poor grounds.

Have your helper turn the ignition key to START while you tap on the starter with a hammer. If the engine starts, you probably need a new starter.

.

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post #3 of 6 Old 12-27-2012, 09:15 AM Thread Starter
vjz
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I was able to get the Jeep over to Advance Auto Parts and had them run a neat test on the Jeep.

The machine ran through some tests as follows:

Battery Test:
Voltage: 13.46 V
Rated CCA: 850
Measured CCA: 959
Battery temperature: 34 degrees

Starter test:

Voltage: 12.05 V

Test says starter is good.

Alternator:

Test with no load: 14.22 V

Test under load (Headlights, blower, radio): 14.14 V

So, the test shows that everything SEEMS normal.

This problem is intermittent. At Advance, I shut the Jeep off to go inside. When I came out, it would do its magic slow crank and final clicks. Then, I put it in Neutral and it fired up, slowly, but did fire up. It did this once or twice more in neutral.

When I got home, I put the Jeep in the garage and shut it off. I tried to start it twice, and BOTH times it cranked just fine and started with no issues.

It's baffling.
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post #4 of 6 Old 12-27-2012, 09:45 AM
CJ7-Tim
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Handheld testers are not very accurate. The proper way to test a battery, alternator, or starter is to remove it and use a test machine that applies a simulates works load. Load Testing is the most accurate way to test, however marginal parts may test good, and still not function correctly. If all the parts are good, you have a connection problem or a ignition switch problem.

Buy multi-meter and start testing.

Perform routine maintenance of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Copper wires should be copper color, not black or green. Do the same for the grounding wires from the starter to engine block, and from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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post #5 of 6 Old 12-28-2012, 08:20 AM Thread Starter
vjz
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I broke the starter getting it off, so I had to replace it.

That turns out to be the problem anyway.

I cleaned up the connections to the starter and replaced the starter.

It turns over on the second or third rotation now! It's never started so effortlessly.
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post #6 of 6 Old 02-01-2014, 06:44 AM
BlueRidgeMark
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Quote:
Originally Posted by vjz View Post

It turns over on the second or third rotation now! It's never started so effortlessly.

No, it turns over on the first rotation. That's what turning over means - the starter motor moves the engine.

STARTING is another matter.


Yes, I know it's an old thread. People read old threads.
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