Starting issue not like any other - JeepForum.com
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post #1 of 16 Old 03-18-2020, 12:24 PM Thread Starter
taylorireton
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Starting issue not like any other

Hi all,
I've been dealing with this issue for months now.

When I go to start the TJ it will sometimes start right away, other times it will take 2-3 tries to start. When it is warmed up and I turn it off for 10 min it will take 30 seconds to start and act s if there is no or little power to the starter. It sounds like there is no power in the battery but the battery is fully charged and only 1-month-old reading 13.8 volts, when on, off, is around 11.5-12v. It is also an Odyssey battery and new.


Replaced.

CPS sensor is OEM and about 2 months old, and also tried AutoZones CPS spare sensors I have.
New starter, solenoid and wire
New Fuel pump, has steady pressure at idle and off.
New Odyssey 34/78-PC1500DT Battery is 1 month old.
Ground wires on the engine in both spots are solid.

Any insight or help is appreciated. Thanks!

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post #2 of 16 Old 03-18-2020, 12:34 PM
jtec
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check fuel pressure, turn key on (not start) record high pressure @3seconds, leaving key on record and post PSI again in 5min.

Scan and post all codes.

How do plugs look - DRY, black, wet or dry, damaged?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 16 Old 03-18-2020, 12:45 PM Thread Starter
taylorireton
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Thanks for that quick reply.

Fuel pressure is all within correct ranges, forgot the readings but did confirm they are right when I was first experiencing the issue.

No codes.

I will check the plugs, i have not checked those.

Thanks
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post #4 of 16 Old 03-18-2020, 02:01 PM
mukluk
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Quote:
battery is fully charged and only 1-month-old reading 13.8 volts, when on, off, is around 11.5-12v
A fully charged battery is 12.6-12.8 volts. If your reading of 11.5-12v is true then it's discharged.

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post #5 of 16 Old 03-18-2020, 04:34 PM
Jonny Jeep
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Even though the battery is new it is discharged or bad. See if you can get it charged properly with a plug in charger and then load test it. It's rare, but not unknown for batteries to be DOA.
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post #6 of 16 Old 06-16-2020, 11:40 PM Thread Starter
taylorireton
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Update

Hi all sorry for the later response.

Haven't gotten around to it til now. It doesn't seem to be a spark plug issue.

Code:
https://photos.app.goo.gl/AdNkJEFurfDkPRZP7
The battery is 200 more CCA than the Yellow tops, new starter, and fuel pump, OEM Crank Shaft Position sensor. Once it runs it runs fine, But once it warms up then 5 min later it will not start, it sounds as if the flywheel is only turning 1/8 of a turn or until it hits Top Dead Center then it will start after about 5 trys.


Thanks all, this is driving me insane and has been a PIA for the past few months.
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post #7 of 16 Old 06-17-2020, 06:02 AM
jay-h
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I'm suspecting battery (or possibly cable, or starter is weak)

Read the voltage at the battery posts while starting cold then while starting hot.

Additionally read the voltage drop from neg post to ground (block) --while cranking (cold and hot)
Voltage drop should be no more than a fraction of a a volt.

Also read voltage drop from pos post to high power terminal on starter.

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post #8 of 16 Old 06-17-2020, 07:13 AM
jjandascog
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What is the condition of the battery cables?

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post #9 of 16 Old 06-17-2020, 08:17 AM
jay-h
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To clarify my earlier post, if there is a voltage drop it can indeed be (as noted by jandascog) a cable issue. Corrosion can cause a high resistance under load, and as it gets hotter the resistance increases.

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post #10 of 16 Old 06-17-2020, 09:30 AM
Dale M.
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Quote:
Originally Posted by jay-h View Post
To clarify my earlier post, if there is a voltage drop it can indeed be (as noted by jandascog) a cable issue. Corrosion can cause a high resistance under load, and as it gets hotter the resistance increases.
And the corrosion in cable can be hidden by insulation so its not visible....

Also scrupulously clean all connections to bright shiny state...

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post #11 of 16 Old 07-03-2020, 06:59 PM Thread Starter
taylorireton
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Hi all thanks for the replies, sorry I have been trying to find time to try these things out. Still having the same problem.

I just replaced both pos and neg cables and connectors from the battery to the motor and cleaned the terminals on the battery and the motor.

Battery and starter are 2 months old.

There wasn't much if any voltage drop on the other tests, but there was a 1 volt drop when I tested the when hot:
"Additionally read the voltage drop from neg post to ground (block) --while cranking (cold and hot)
Voltage drop should be no more than a fraction of a a volt.
" so I replaced the neg cable.

Any other ideas?

Thanks All!
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post #12 of 16 Old 07-04-2020, 01:33 AM
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Did you ever fix the issue where the battery reads less than 12.6 volts with the engine off? Engines don't like to start with discharged batteries, regardless of how new they are.

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post #13 of 16 Old 07-04-2020, 11:13 AM
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I agree a new battery shouldn’t be reading that low.

I’d trade in a known good battery and see how it goes.

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post #14 of 16 Old 07-10-2020, 12:17 PM Thread Starter
taylorireton
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Update

Been testing it all week and still the same issue. The battery has been reading 12.5-12.6 volts. The next step is that someone mentioned checking the Flexplate bolts and try to move the CPS sensor closer.

I Will report back.

Thanks!
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post #15 of 16 Old 07-24-2020, 05:34 PM Thread Starter
taylorireton
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Thanks for your help.

It seems that the aftermarket temp gauge for the transmission was somehow draining the battery really, really slowly. Also, 2 of the 4 Flywheel to torque converter bolts were hand loose and the other was semi-loose, were the problem on the starter issue.

Thanks everyone for your help!
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