Help. Rebuilt 4.0 and timing is off - JeepForum.com
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post #1 of 29 Old 05-23-2012, 08:46 PM Thread Starter
funnyduck84
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Help. Rebuilt 4.0 and timing is off

I just did a rebuild on my 4.0 and now it runs rough if it wants to start. I put a mild howards cam and bored it 30 over. Is there any thing I can do to fix it or am I screwed

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post #2 of 29 Old 05-23-2012, 09:01 PM
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Originally Posted by funnyduck84 View Post
I just did a rebuild on my 4.0 and now it runs rough if it wants to start. I put a mild howards cam and bored it 30 over. Is there any thing I can do to fix it or am I screwed
Thats kinda a vague description but if I had to guess I would say start with checking the timing.

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post #3 of 29 Old 05-23-2012, 09:02 PM
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ANd before everyone else jumps on ya about it you should really fill out the info on your jeep in your profile so we can see what you got to better help you with problems.

KCCO
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post #4 of 29 Old 05-24-2012, 09:46 AM Thread Starter
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The timings off. It's at 30 degrees. But I can't turn the distributer enough to fix it.
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post #5 of 29 Old 05-24-2012, 11:44 AM
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hi all

check to see if distributor was indexed right, rotor points to TDC at piston one, or pull timming cover and make sure the chian is not streched or that the timing marks are aligned properly. it seems the timing is ways off.................good luck.

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post #6 of 29 Old 05-24-2012, 05:37 PM Thread Starter
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It's a new timing set and I had my machinist degree the cam
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post #7 of 29 Old 05-24-2012, 07:46 PM
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Originally Posted by funnyduck84 View Post
The timings off. It's at 30 degrees. But I can't turn the distributer enough to fix it.
Turning the Distributor has no effect on Ignition timing on our engines. Timing is controlled by the pcm, using the Crankshaft sensor for reference.

Turning the distributor will affect Injection, since the camshaft sensor is inside. Cam sensor is used by the PCM to synchronize injection with the crankshaft sensor signals.


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post #8 of 29 Old 05-24-2012, 08:24 PM
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Originally Posted by Curly5759 View Post
Cam sensor is used by the PCM to synchronize injection with the crankshaft sensor signals.
Does it take a DRB to set that properly?...
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post #9 of 29 Old 05-24-2012, 09:02 PM Thread Starter
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what is a DRB? i dont know much about 4.0s yet. my last toy was a lifted 96 ram with a 5.2. i can tell you just about any thing you need to know about that truck
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post #10 of 29 Old 05-24-2012, 09:32 PM
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what is a DRB? i dont know much about 4.0s yet. my last toy was a lifted 96 ram with a 5.2. i can tell you just about any thing you need to know about that truck
It is a very expensive tool used by dealerships to preform certain functions on a vehicle.
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post #11 of 29 Old 05-24-2012, 09:36 PM
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what is a DRB?
Diagnostic Readout Box.

The good ones that I've seen run about $6K...
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post #12 of 29 Old 05-24-2012, 10:04 PM
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I have set synch using the snap on 'brick' (MT2500) and I have used a Genysis as well.


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post #13 of 29 Old 05-24-2012, 10:35 PM
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Does it take a DRB to set that properly?...
Quote:
Originally Posted by Curly5759 View Post
I have set synch using the snap on 'brick' (MT2500) and I have used a Genysis as well.
Do those work the same as the chrysler DRB tool for this effort?...
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post #14 of 29 Old 05-24-2012, 10:50 PM
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Do those work the same as the chrysler DRB tool for this effort?...
All you need is to see is the synch on the Datastream. Some scanners don't show it even though they have datastream. Don't know why that is.
If it does show up, you can set the synch while watching the scanner. Sort of like adjusting dwell on a GM V8 (showing my age.)

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post #15 of 29 Old 05-24-2012, 11:03 PM
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Originally Posted by Curly5759 View Post
All you need is to see is the synch on the Datastream. Some scanners don't show it even though they have datastream. Don't know why that is.
If it does show up, you can set the synch while watching the scanner. Sort of like adjusting dwell on a GM V8 (showing my age.)

Curly
You're not overly old.

How about setting the 3rd brush on a generator?...
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