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Old 01-02-2013, 07:09 PM   #1
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Anyone running a stroked 4.0?

Trying to get my stroked 4.0 to run.

Here is the info.

4.0 block, head and induction system out of 95 YJ
4.2 crank and rods.
Using complete harness, ignition system and fuel system out of the 95.
Stock cam and injectors.

I have checked and re-checked my timing several times.

Runs like it is to far retard in the dist. Pulled hold down clamp and tried to advance/retard dist. No change.

Any advice?
Do I need to run the ford injectors to get it to run right?

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Old 01-03-2013, 04:01 PM   #2
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So here is all I have replaced so far. Cap, rotor, plugs, wires, coil pick up inside dist, coil and crank sensor. Still runs the same. Running real rich, so much so that it is fouling my plugs. Backfires through exhaust. I have checked the timing so many times I could probably do it in my sleep.

So lets forget it is a stroked motor for a moment. What else controls the spark on this system?

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Old 01-03-2013, 04:35 PM   #3
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How's your compression?
Is your cam timed in right?
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Old 01-03-2013, 05:03 PM   #4
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Quote:
Originally Posted by Speedy4x4 View Post
How's your compression?
Is your cam timed in right?
New motor.. Cam installed straight up.
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Old 01-04-2013, 11:04 AM   #5
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I can not believe I am about to post this, but I think I may have installed the wrong flywheel.
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Old 01-04-2013, 04:49 PM   #6
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Neither an incorrect flywheel nor incorrect timing would cause a rich condition. You are either looking in the wrong place or incorrectly describing the symptoms.
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Old 01-04-2013, 05:23 PM   #7
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Quote:
Originally Posted by rykemc

Runs like it is to far retard in the dist. Pulled hold down clamp and tried to advance/retard dist. No change.
Was there NO change or not the change you want? Just trying to make sure If nothing changed I would try a different dizzy. Which dizzy did you use the one for the 95 I would assume??
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Old 01-04-2013, 05:29 PM   #8
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Just got the other flywheel installed. Changing the oil then resetting the dist. The difference between the 4.2 flywheel and the 4.0 flywheel is night and day. The symptoms I was having before I noticed I had the wrong flywheel on makes sense now that I have looked at the two flywheels together. I'll know for sure later tonight but I have no doubt this is going to fix my problem
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Old 01-04-2013, 07:26 PM   #9
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Fixed it!!!!!!!!!!!! Runs great. Broke the cam in with no problems. Has great idle and throttle response. Man I wish I would have figured this out about 4 days ago.
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Old 01-04-2013, 09:11 PM   #10
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Quote:
Originally Posted by Dirttracker18 View Post
Neither an incorrect flywheel nor incorrect timing would cause a rich condition. You are either looking in the wrong place or incorrectly describing the symptoms.
You would be wrong
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Old 01-04-2013, 11:17 PM   #11
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Can you explain this?
I don't understand.
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Old 01-05-2013, 04:39 AM   #12
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Explain how the flywheel was the problem with my running issues? If that is what you are asking here it goes.
The flywheel has notches cut into the outer edge that the crank sensor reads. It will fire the spark. The problem I had is the 4.2 flywheel I had on the motor to begin with had the wrong pattern for my set up. The notches were smaller, closer together and about three times as many. This was causing my dist to fire the plugs at the wrong time in correllation with my injectors. So it was causing un-burnt fuel to enter the combustion chamber. So much fuel that it would foul the plugs out in just a couple of cranks of the motor. So much raw fuel was going into my motor that when I changed my oil after if found out what I did the oil had a very strong gas smell. Once I put the 4.0 flywheel on with the correct pattern of notches the firing order was correct for the firing of the injectors. I'll take a picture of the wrong flywheel so you will better understand the notches.
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Old 01-05-2013, 06:17 AM   #13
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Yep, the same thing will happen if you try to use a pre 91 4.0L flywheel (xj) with 91+ injection.
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Old 01-05-2013, 06:59 AM   #14
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Yep crank sensor position.... But you beat me to it.
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Old 01-05-2013, 08:45 AM   #15
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Quote:
Originally Posted by rykemc View Post
Explain how the flywheel was the problem with my running issues? If that is what you are asking here it goes.
The flywheel has notches cut into the outer edge that the crank sensor reads. It will fire the spark. The problem I had is the 4.2 flywheel I had on the motor to begin with had the wrong pattern for my set up. The notches were smaller, closer together and about three times as many. This was causing my dist to fire the plugs at the wrong time in correllation with my injectors. So it was causing un-burnt fuel to enter the combustion chamber. So much fuel that it would foul the plugs out in just a couple of cranks of the motor. So much raw fuel was going into my motor that when I changed my oil after if found out what I did the oil had a very strong gas smell. Once I put the 4.0 flywheel on with the correct pattern of notches the firing order was correct for the firing of the injectors. I'll take a picture of the wrong flywheel so you will better understand the notches.
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