Car not starting in cold weather - JeepForum.com
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post #1 of 11 Old 04-19-2021, 11:03 PM Thread Starter
N8dasavage
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Car not starting in cold weather

My 2000 jeep grand cherokee 4.7 v8 has been having trouble starting in the cold. the battery is okay, it cranks but it doesnít start, iíve replaced all the sparks and iíve cleaned and checked all the injectors. it may sound weird but i took the exhaust off and it just started happening, the o2 sensors are all still on. itís stumped me and a fee other car guys and iím starting to think itís the starter but i wanted to hop on here and see if anyone had had a problem like this

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post #2 of 11 Old 04-20-2021, 06:16 AM
Bigrigr
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If its cranking every time, then its not the starter. check your fuel pressure...Need to know what the max pressure is, and how long it will hold pressure after you shut it down...
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post #3 of 11 Old 04-20-2021, 07:48 AM
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not starting in cold weather - its spring time for most of us, so cold start issues I tho uht would be done for the year IDK.

As mentioned by colleague check fuel pressure with a gauge. Post PSI
ECT the temp that the PCM sees. Any gauge issues to mention?
Did you scan for codes? Post ALL codes.

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 #4 of 11 Old 04-20-2021, 08:43 AM Thread Starter
N8dasavage
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i suspected the fuel pressure, iíll check it. iíve scanned it before, no codes at all.
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post #5 of 11 Old 04-20-2021, 09:07 AM
jtec
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if you have a scanner check ECT do this first thing in morning and compare to ambient.

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 #6 of 11 Old 04-20-2021, 09:28 AM
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If fuel pressure is good, I would use some starting fluid and see if it runs then. If it does, suspect water in the gas. Just enough that on a cold day the issue appears, where a warm day or engine already warm not.
How "cold" are we talking here anyway?

I'm also confused about he started being a possible issue.
If the started is engaging and spinning the engine at all, it's not the issue.

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post #7 of 11 Old 04-20-2021, 10:16 AM Thread Starter
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Quote:
Originally Posted by jtec View Post
if you have a scanner check ECT do this first thing in morning and compare to ambient.
will do
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post #8 of 11 Old 04-20-2021, 10:19 AM Thread Starter
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Quote:
Originally Posted by Double E View Post
If fuel pressure is good, I would use some starting fluid and see if it runs then. If it does, suspect water in the gas. Just enough that on a cold day the issue appears, where a warm day or engine already warm not.
How "cold" are we talking here anyway?

I'm also confused about he started being a possible issue.
If the started is engaging and spinning the engine at all, it's not the issue.
iíve been using starting fluid for a bit to get it going. if itís around 35į F or lower it has trouble starting. iím kinda new to the car world so iíve been learning a lot of new things. ive just been looking around and i didnít know what to diagnose it as so i guessed the starter.
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post #9 of 11 Old 04-20-2021, 10:31 AM
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35deg is cool in my thinking, not the -teens so members deal with.

OK I am rambling, if you have a scanner look at ECT, IAT, the fuel trims long and short, pre cat o2 sensor voltages - ie swinging .3v to .7v. AND ALL codes.

BUT sounds like fuel pressure.

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 #10 of 11 Old 04-20-2021, 11:38 AM
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Indeed. 35F is not a severe situation.
It should easily start down to zero F and even below that before it begins to really struggle to fire.
Even then, with good fuel and a strong battery, what's mainly working against it getting healthy start is slow flowing oil.
Our Canadian friends on here rarely have issues but many of them are using a block heater against the slow flowing oil

So there's something else going on. As suggested fuel pressure is the next common issue.
The WJ is typically due for a fuel pump at 15-18 years.

When did it last run normally?

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post #11 of 11 Old 04-21-2021, 06:01 AM Thread Starter
N8dasavage
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Quote:
Originally Posted by Double E View Post
Indeed. 35F is not a severe situation.
It should easily start down to zero F and even below that before it begins to really struggle to fire.
Even then, with good fuel and a strong battery, what's mainly working against it getting healthy start is slow flowing oil.
Our Canadian friends on here rarely have issues but many of them are using a block heater against the slow flowing oil

So there's something else going on. As suggested fuel pressure is the next common issue.
The WJ is typically due for a fuel pump at 15-18 years.

When did it last run normally?

About a year ago, it’s a really beat up car, i’ve been using a oil pan heater to help her start up in the morning. i’m ch cling fuel pressure and idle and before start and after shutoff this weekend and i’ll scan all codes to see if it’s and problems like that
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