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Old 02-15-2014, 06:16 PM   #1
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06 LJ whistle??

My buddy has an 06 LJ 4.0 with 19k auto tranny. It has some weird whistle noise. Like a very quick intermittent whistle sound that gets louder and quicker when he speeds up. Drives fine? Anyone know what this is? Doesnt do it at idle. Only when in motion.

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Old 02-15-2014, 09:04 PM   #2
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Originally Posted by thgr8alex View Post
My buddy has an 06 LJ 4.0 with 19k auto tranny. It has some weird whistle noise. Like a very quick intermittent whistle sound that gets louder and quicker when he speeds up. Drives fine? Anyone know what this is? Doesnt do it at idle. Only when in motion.
Where is it coming from? Hardtop/softtop? Engine Area? Under the car?

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Old 02-15-2014, 09:06 PM   #3
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Sorry, engine area.
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Old 02-16-2014, 11:13 AM   #4
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After some searching im thinking it may be the infamous OPDA issue
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Old 02-16-2014, 11:19 AM   #5
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After some searching im thinking it may be the infamous OPDA issue
I'd pull and inspect that immediately, without delay and I wouldn't be running my motor at all until I did.
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Old 02-16-2014, 11:55 AM   #6
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I read on another thread that some people found a leaky valve cover gasket as the source of a whistle.
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Old 02-16-2014, 12:57 PM   #7
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I'd pull and inspect that immediately, without delay and I wouldn't be running my motor at all until I did.
Im not very familiar with the issue but have read up on a few threads breifly. What exactly would we be checking for?
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Old 02-16-2014, 01:29 PM   #8
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First you need to identify whether or not it is an OPDA issue or not. Over by the oil filter, where the distributor would be on the older models is the OPDA. The sound is more of a reeee reee reee "laughing monkey" or squeak-chirping sound than a whistle, but you need to identify the specific area it's coming from first. If you determine it's the OPDA for a fact, or if you're just curious to see how it's holding up, you would need to either google OPDA removal or consult your service manual to make sure you know how to do it. Keeping the target wheel and gear alignment when you slip it back in is key.
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Old 02-16-2014, 01:40 PM   #9
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First you need to identify whether or not it is an OPDA issue or not. Over by the oil filter, where the distributor would be on the older models is the OPDA. The sound is more of a reeee reee reee "laughing monkey" or squeak-chirping sound than a whistle, but you need to identify the specific area it's coming from first. If you determine it's the OPDA for a fact, or if you're just curious to see how it's holding up, you would need to either google OPDA removal or consult your service manual to make sure you know how to do it. Keeping the target wheel and gear alignment when you slip it back in is key.
I just watched a youtube video on it and doesnt seem too bad conpared to other things ive done. Just wondering what all would i look for upon removal? Just wear on the gears or is there more to loook for That would indicate a bad OPDA
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Old 02-16-2014, 02:28 PM   #10
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Again, the first step is to trace your symptom. Yes there would be wear at the gear, it could present as missing chunks, gnarled sections, or sloppy wear marks. There's a ton of info on it out there and I haven't had symptoms yet but I did my due diligence just to be aware.

06 OPDA / cam gear

There's a video on you tube that's good enough as a guide too.
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Old 02-16-2014, 10:36 PM   #11
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I just replaced my OPDA today. It was an incredibly easy job.
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Old 02-16-2014, 10:41 PM   #12
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Well guys.. Bad news.. I have tried amd tried to help him but hes stubborn and gotta do things his way. Doesnt wanna mess with it or anything. He said hes driven it this long like that. So it should be fine and is going to drive it like normal and take it to his dad to fix it this weekend. I did all kinda research for him and said it was extremely easy amd id love to help but hes a "take it to the shop" kinda guy. I told him.how serious of an issue it was and he was lucky to have a warning but he wont listen.. Driving it now.... Thanks for all your help anyways. Hes gonna figure it out the hard way.... Ive done everything i can do to save it. Kills me but i cant do anything more. Drives me crazy its such an easy fix but if not addressed could be catostrophic but hes just like that. Kinda needs to learn his lesson but i dont wish that upon anyone i hope it stays ok for him til fixed. The job is NOTHING compared to othr things... Ok ill stop ranting now.

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