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Unread 03-24-2007, 01:06 AM   #1
squattingdog
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1990 YJ Wrangler 
 
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Intermittent starting problem...

I am trying to track down the problem with my 90 YJ not starting every now and then... couple of questions:

How much power should run to the fuel injector? If no power, does that mean a bad ECM?

...The engine will turnover constantly and not fire. Then the next day it starts up just fine! Thanks in advance for any help...

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Unread 03-24-2007, 05:37 AM   #2
Jeep25
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Quote:
Originally Posted by squattingdog
I am trying to track down the problem with my 90 YJ not starting every now and then... couple of questions:

How much power should run to the fuel injector? If no power, does that mean a bad ECM?

...The engine will turnover constantly and not fire. Then the next day it starts up just fine! Thanks in advance for any help...
If the engine is turning I don't think it's a bad ECM?
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Unread 03-24-2007, 06:34 AM   #3
rustywrangler
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We need more info, Engine, trans, mods to the engine, when maint was done, etc.
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Unread 03-24-2007, 07:07 AM   #4
BASSPLAYER1
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I had the same prob. when it got cold out it waseven worse!!! It was my computer!!!! I own a 95 yj 2.5 5 speed.

Good Luck
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Unread 03-24-2007, 11:59 AM   #5
squattingdog
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Stock 2.5L engine, stock AX5 tranny, with split fire spark plugs, msd 8mm wires. Regular maintenance is kept up. ...I posted this thread last night and now it is running??
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Unread 03-24-2007, 12:05 PM   #6
squattingdog
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Quote:
Originally Posted by BASSPLAYER1
I had the same prob. when it got cold out it waseven worse!!! It was my computer!!!! I own a 95 yj 2.5 5 speed.

Good Luck
How can you test the computer? Is it a driveway job or is there special tools involved?
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Unread 03-24-2007, 04:57 PM   #7
MudDancer
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Quote:
Originally Posted by squattingdog
I am trying to track down the problem with my 90 YJ not starting every now and then... couple of questions:

How much power should run to the fuel injector? If no power, does that mean a bad ECM?

...The engine will turnover constantly and not fire. Then the next day it starts up just fine! Thanks in advance for any help...
I had similar problem with my 87 YJ, 2.5l 4banger, TBI, stock. I thought it had something to do with my fuel pump. What I found was 2 Relays that transmitted electrical signals to componets (such as fuel and ignition). Also known as (ASD) Auto Shutdown relay. They are located on passenger side next to battery, one was black the other blue plugs. the cost was around $8.00 each. After replacing them my problem was cured.
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Unread 03-25-2007, 12:38 AM   #8
squattingdog
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Well i will definitely will replace them and keep the progress posted....thanks
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Unread 03-27-2007, 04:41 PM   #9
squattingdog
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..Replaced both the relays...nothing has changed The same problem still exists...maybe a 12 pound hammer??
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Unread 03-27-2007, 06:15 PM   #10
idiot magnet
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I went through something like this last week, but when I traced the wires going to the fuel pump I found a 4 foot section that was dead.
Check to see if you are getting power to the fuel pump, clean your crank position sensor, clean all your grounds and connections, check for cracks in the distributor cap and see if the rotor is good.
I started replacing too many things and it was a simple piece of new wire and she starts and runs everytime. Trace all the wires to the pump and test them every foot. There is a section that wears out just above the rear axle where the wire rubs on the frame. Mine wore through the plastic protector.
It's worth a shot and at least you'll know if you have power to the pump, then you can eliminate other things as you go.
Good luck.
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Unread 03-27-2007, 09:51 PM   #11
squattingdog
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I appreciate the help... will definitely check this tomorrow...I'm sure if the problem persists then I'll be back on here asking more questions lol
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