Doing 4.0 Swap Now..... Need Help Now !!! - Page 7 - JeepForum.com

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post #91 of 157 Old 01-21-2010, 06:38 AM
YJBlues
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btw, 02 sensor wont keep it from starting, it runs with presets for the first few seconds minimum, 02 reading doesn't affect that to my knowledge. No ecm codes is perplexing, but on the up side, any readings you get before it's actually run will be mostly useless. It will pick up a few things, but if it's indeed "trying" to start, I suspect fuel delivery to be at least one of the issues.

I'm assuming here that it's been confirmed that the ecm is in working order of course, CEL comes on, then goes off after a few seconds, etc. Again I assume to check the read outs, the OP is turning the key, on, off, on, off, on then waiting for the CEL to go out, then however long it takes for the CEL light to start blinking codes, usually 10ish seconds after the CEL initially goes out?


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post #92 of 157 Old 01-21-2010, 06:55 AM Thread Starter
cevans87
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ok well i'm lost

i tried timing, i've checked fuel, plugs, cps, idle air control valve,

and still nothing...

i wondering if my fuel lines are right ?

this is how i have it hooked up

THE FUEL LINE DIRECTLY IN FRONT OF THE REGULATOR IS MY RETURN LINE... WHICH JUST HAPPENS TO BE THE ONE CLOSEST TO THE FRONT OF THE VEHICLE...

MY FUEL LINE CLOSEST TO THE FIREWALL IS MY FEED LINE


SOUND RIGHT TO ANYONE?
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post #93 of 157 Old 01-21-2010, 07:04 AM
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Quote:
Originally Posted by cevans87 View Post
ok well i'm lost

i tried timing, i've checked fuel, plugs, cps, idle air control valve,

and still nothing...

i wondering if my fuel lines are right ?

this is how i have it hooked up

THE FUEL LINE DIRECTLY IN FRONT OF THE REGULATOR IS MY RETURN LINE... WHICH JUST HAPPENS TO BE THE ONE CLOSEST TO THE FRONT OF THE VEHICLE...

MY FUEL LINE CLOSEST TO THE FIREWALL IS MY FEED LINE


SOUND RIGHT TO ANYONE?
put about half a cup of gas in the throttle body and try to start it. You may be trying to debug a system that has nothing wrong with it

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post #94 of 157 Old 01-21-2010, 08:58 AM Thread Starter
cevans87
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i will try it tonight, but last night when i removed the spark plugs, they were covered with gas, so i cleaned them

i honestly don't know whats going on with it, and i'm about to loose my mind

if it starts when i pour gas in, what do i need to do then ?
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post #95 of 157 Old 01-21-2010, 09:00 AM
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then you make sure your injectors are firing and that there is pressure to the fuel rail, which can be checked by pushing the button in on the schrader valve in the rail.

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post #96 of 157 Old 01-21-2010, 09:10 AM Thread Starter
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there is plenty of presure at the valve, how do i test the injectors ?
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post #97 of 157 Old 01-21-2010, 09:16 AM
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pretty easy, test light can do it. we have two wire injectors right? just connect the testlight between the wires on one of the injectors and crank the engine, it should flash.

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post #98 of 157 Old 01-21-2010, 09:32 AM
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Have you checked for spark at the spark plugs btw? several methods of checking, but I generally just use a timing light. the flash is easy to see.
by your description of the conditions of the plugs and the fact that you can't get any codes from the ecm, I'm starting to wonder if it's working.

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post #99 of 157 Old 01-21-2010, 11:25 AM Thread Starter
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if the ecm is working ?

can you go into a little more detail with testing the injectors
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post #100 of 157 Old 01-21-2010, 11:34 AM
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the injectors are controlled by the ecm, it sends an electrical current to the injector, the injector pumps a burst of fuel into the intake. The wires that connect to the injector carries that current. If there is a signal, the injectors are working. So basically you are simply checking to see if the ecm is sending the current. Testing the injectors might sound like it should be complicated, and it can get more involved if you are trying to find more than if they are just firing, but in this instance, it really isn't any harder than finding out if your coil is getting power. Just check for juice when the motor is cranking across the two wires on one of the injectors.

And yes, I'm starting to wonder if the ECM is doing it's job. But let's test for spark and injectors before we jump to conclusions. though with wet plugs, checking for spark is probably the first test you want to do. If no spark you don't even have to bother checking the injectors yet.

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post #101 of 157 Old 01-21-2010, 11:55 AM Thread Starter
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ok will do as soon as i get home yjblues
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post #102 of 157 Old 01-21-2010, 09:01 PM
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Any word on this?

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post #103 of 157 Old 01-22-2010, 08:09 AM Thread Starter
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ok got it to run from 5-10 seconds... but extremely rough
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post #104 of 157 Old 01-22-2010, 08:18 AM Thread Starter
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went and got new plugs and cap and rotor, tested the injectors, and for spark
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post #105 of 157 Old 01-22-2010, 08:36 AM
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got it to run how? with the half cup of gas or some other way? The results of the spark and injector test?

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