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Old May 4th, 2015, 10:48 AM   #1
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J37A1 Heads/J30A4 Block

So I've recently completed matting J37A1 (2011 MDX) heads on my 03AV6 6Spd. The heads were milled 40 thousandths. Pnp on the intake valves, intake ports and on the exhaust side. Intake maniold runners off a 8th gen Accord V6 also PnP, were use to mate to a TL-SH intake manifold with P2R intake manifold spacer and thermal gaskets all PnP and gasket matched. ZDX throttle body, P2R throttle body spacer pnp and P2R thermal gaskets used to guide the air flow in smoothly via 4'' custom cold air intake. Went with the RV6 PCDs matted to a stock j pipe for now. Debating on the ATPL j pipe or the one that guy is making on here. Jus waitin for results...the car runs amazing when the CEL, and both traction lights are on. When jus the CEL is on i have various codes. Misfire on all 6 cylinders, and cam sensor intermittent malfunction. It doesn't want to idle. Also when accelerating it acts
like its gettin held back and bucks til it goes over 2500-3000. both traction lights come on and it idles fine. Also runs fine throughout the entire rpms...do i need to do a idle relean and a crank relearn? Any ideas on how to do it manually or do i have to take it to Honda? Any info is appreciated. I tried the holding the rpms at 3000 till the radiator fan comes. It still doesnt want to idle.
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Old May 4th, 2015, 11:09 AM   #2
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Sounds like your timing may be off. I would start there.
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Old May 4th, 2015, 11:09 AM   #3
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Old May 4th, 2015, 11:12 AM   #4
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Timing is on point...i triple check it before input everything back together. Any idea on the idle relearn? Crank relearn? I have a cousin that works at Honda says i need a crank relearn and he doesn't know of any way to do it other than the HDS they use.
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Old May 4th, 2015, 12:40 PM   #5
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Are these my heads? I really hope you get it running right!

Sucks it's not running correctly yet. Did you tune it? Just curiously, why would you need a crank relearn if it's just a heads swap.
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Old May 4th, 2015, 12:43 PM   #6
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are you using MDX coil packs and not the accord one? The MDX are longer.
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Old May 4th, 2015, 01:43 PM   #7
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my first thought was crank relearn too. My mdx was doing something very identical to this when my battery died one morning. Did a quick crank relearn with a scan tool and misfires we're gone. And the misfires weren't always present except when the ecm detected a correlation issue then set the mil.

Also, check for misadjusted valve clearances as this can cause the engine to misfire once the engine reaches operating temps or vice versa.
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Old May 4th, 2015, 07:03 PM   #8
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How would one go about the "Crank Relearn" process? Just curious, no issues here.

Hope you get that thing right, bud. I know I had a couple hiccups when I did mine, but they got straightened out
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Old May 4th, 2015, 08:29 PM   #9
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How would one go about the "Crank Relearn" process? Just curious, no issues here.

Hope you get that thing right, bud. I know I had a couple hiccups when I did mine, but they got straightened out
Here is a procedure I pulled from the service manual but have never tried this one. Though it does specify using an HDS to clear the CKP pattern prior to performing the procedure and then checking the status afterwards, I'd be willing to bet that an HDS isn't necessary to carry out. Obviously the pattern can be cleared out (or even corrupted) without any scan tool so again, I would imagine it would still work properly IF this is the reason why the engine is running poorly or misfiring.

"CKP PATTERN CLEAR/CKP Pattern Learn Procedure

Enable Criteria

ECT at 176 F (8O C) or higher.

Procedure

Clear the CKP Pattern with the HDS while the engine is stopped.
Turn the ignition OFF.
Turn the ignition ON (II), and wait for 30 seconds .
Test-drive the vehicle on a level road: Decelerate (with the throttle fully closed) from an engine speed of 2,500 rpm to 1,000 rpm with the A/T in 2, or the M/T in 2nd or 3rd gear.
Stop the vehicle. Do not turn the ignition off.
Select the ALL DATA LIST in the DATA LIST MENU of the HDS.
Check the status of PULSER F/B LEARN. If it is set to NG, the enable criteria was probably not met;repeat the procedure from the beginning."
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Old May 4th, 2015, 08:42 PM   #10
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^ Never heard of doing that. What, Why and When should this be done? The obvious would be if your car isnt running right, but under what conditions. How would that condition be caused?
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Old May 4th, 2015, 09:35 PM   #11
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Im using the Accord coil packs. They fit. The coil packs jus need to sit over the spack plug. I had to get a few nuts so that they stay down over them.
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Old May 4th, 2015, 09:39 PM   #12
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How would one go about the "Crank Relearn" process? Just curious, no issues here.

Hope you get that thing right, bud. I know I had a couple hiccups when I did mine, but they got straightened out
I hope so too Accord 325. It runs strong and pulls hard! Ive read that a crank relearn is needed when doing the timing belt. It is even written down in the procedure from Honda.
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Old May 4th, 2015, 09:41 PM   #13
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Yea Sonnick these are your heads. Tried reaching out to you via text...idk if you were busy tho. The only issue i had Accord325 was the cam sensor and cam gear itself. I switched them out because they where different. Did you notice that When doin the swap?
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Old May 4th, 2015, 09:45 PM   #14
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Old May 4th, 2015, 09:46 PM   #15
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Thats why im thinkin it may need the crank relearn....the patterns are different. The top is the J37. The bottom J30.
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Old May 4th, 2015, 09:47 PM   #16
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Was that like a week or so ago? If so, I was on my honeymoon! I apologize for not answering. I forgot to respond when I got home. I will text you now. I hope everything works out!!
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Old May 5th, 2015, 01:21 PM   #17
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If the cam gears have the same amount of teeth and diameter, I would use the lightest one

I've changed heads twice on my car, another on a buddies and never did the crank relearn. All run strong
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Old May 5th, 2015, 01:54 PM   #18
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Use the accord cam gears. The weights are what the sensor count as it passes by.

not sure why you are having issue with your heads. My j35a8 swap didn't need a to do a crank or cam relearn. I just drove it back 3.
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Old May 5th, 2015, 02:01 PM   #19
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And I was wrong....
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Old May 5th, 2015, 10:34 PM   #20
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Use the accord cam gears. The weights are what the sensor count as it passes by.

not sure why you are having issue with your heads. My j35a8 swap didn't need a to do a crank or cam relearn. I just drove it back 3.
I did use the J30 cam gear. Im thinkin i need to use the relearn because i had the J37 cam gear on when i initially started it up. Might have confused things. I have an appointment at 430 to get a crank relearn and throttle body relearn.
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Old May 5th, 2015, 10:36 PM   #21
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If the cam gears have the same amount of teeth and diameter, I would use the lightest one

I've changed heads twice on my car, another on a buddies and never did the crank relearn. All run strong
Everything is the same on the cam gears except for the weights or "windows" that the cam gear sensor reads.
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Old May 6th, 2015, 03:26 PM   #22
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And I was wrong....
Quick question Accord325...did you use the MDX coil packs or stay with the Accord coil packs?
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Old May 6th, 2015, 05:23 PM   #23
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^ Accord, but I also have 09' heads. You have the newer valve train. I can't recall if my valve covers are MDX or Accord. I think Paul pulled Accord valve covers for me and powered coated them. I do recall the coil packs being different part numbers and Paul also saying something about it. What valve covers you have on there? If MDX, maybe they sit higher, IDK
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Old May 6th, 2015, 05:58 PM   #24
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the MDX coil packs are longer. I just pulled some off of my friend car today to compared to my accord coils. Connectors are the same, but that's about it.
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Old May 6th, 2015, 06:50 PM   #25
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Well I'm using Accord coil packs. I take it you both are running MDX valve covers which must sit higher.
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Old May 6th, 2015, 06:56 PM   #26
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So I've recently completed matting J37A1 (2011 MDX) heads on my 03AV6 6Spd. The heads were milled 40 thousandths. Pnp on the intake valves, intake ports and on the exhaust side.
Did you do any work to the pistons for the bigger 36mm intake valves?
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Old May 6th, 2015, 11:43 PM   #27
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Yea i used the MDX valve covers. As far as the coils i noticed that the MDX coil packs were longer yet the Accord coil pack still sit on top of the plug which I assumed would be sufficient. Honda wasn't able to do anything because the car would not idle whichout a CEL. So my next move would be to try swappin out the Accord coil packs and try the MDX ones. Anyone have some i can borrow?
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Old May 6th, 2015, 11:47 PM   #28
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Originally Posted by Cakes85 View Post
So I've recently completed matting J37A1 (2011 MDX) heads on my 03AV6 6Spd. The heads were milled 40 thousandths. Pnp on the intake valves, intake ports and on the exhaust side.
Did you do any work to the pistons for the bigger 36mm intake valves?
No i did not. No work was required to do the swap. I jus had the head milled 40 thousandths to close up combustion chamber.
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Old May 6th, 2015, 11:48 PM   #29
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Well I'm using Accord coil packs. I take it you both are running MDX valve covers which must sit higher.
will the Accord valve covers work on the MDX heads?
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Old May 7th, 2015, 01:46 AM   #30
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No i did not. No work was required to do the swap. I jus had the head milled 40 thousandths to close up combustion chamber.
Any ballpark idea what your CR is before/after the .040?
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