11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHJake Brake anyone?
Reported or suspected cause
exhaust leak (probably
Suggestion or failed attempt
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Identified cause
1
Suspected cause
0
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Read evidence and context
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Discussions that suspect a cause
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Suspected cause
Well it is probably an exhaust leak (probably before the muffler itself) or a vacuum issue to make that kind of sound off throttle.
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Suggestion
I think bottom line for the OP, inspect the exhausts (upstream of the muffler in particular, and not just for holes, see if the headers have any play) and inspect the intakes also.
Leading evidence: 'exhaust leak (probably' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'exhaust leak (probably' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Inspect intakes also' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suspected cause · Original poster
However, i guess my discription of my problem was off.
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Suggestion
I think bottom line for the OP, inspect the exhausts (upstream of the muffler in particular, and not just for holes, see if the headers have any play) and inspect the intakes also.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
I was thinking this and if you ever run open headers on motors, they will make this sound when off the throttle.
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Inspect intakes also
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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Discussions
Read evidence and context
Discussions that contain suggestions
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Suggestion
I think bottom line for the OP, inspect the exhausts (upstream of the muffler in particular, and not just for holes, see if the headers have any play) and inspect the intakes also.
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11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Hello, i was wondering if i could get some advice. I have a 99 cab with 96k and the other day i drove it to work and it sounded rough. I then noticed that something was rumbling and it was coming from the engine. However, it really was appearent when i let off the gas. The only way i can explain the sound is by saying it sounded like a truck jake braking (but not as loud). further more, i should say that the engine itself sounds great and appearently runs strong but, when I let off the gas the noise is noticed.
Thanks in advance.
Well it is probably an exhaust leak (probably before the muffler itself) or a vacuum issue to make that kind of sound off throttle. I've seen it happen with out of shape headers (imagine that it doesn't sit flush against the block) and couplings on other cars, and broken wastegates and such on turbos.
However I can't hear it, and you're probably best having a local independent mechanic whom you trust have a look at it.
Inspect the intake side as well, I was just thinking it would be a little odd in a flat motor for this to be exhaust side, so try seeing if any of your intake components are loose, have holes or cracks in them, and of course are clamped. from intake to airbox & filter to rubber manifold.
Yeah this was my original though process exactly, after all a jake brake is just a second set of exhaust valves venting to atmosphere.
Then I thought about drilled intakes making the same noise, and the relatively low probability of the headers coming loose in a low boxer like this (this was more of an assumption based on other assumptions about the mounting plane of the headers and the 2nd order characteristics transferred to the case, but rust or the aforementioned possibly worn/broken engine mounts could blow up all that math)
I think bottom line for the OP, inspect the exhausts (upstream of the muffler in particular, and not just for holes, see if the headers have any play) and inspect the intakes also. And don't freak out, nothing will blow up, but don't leave it alone either.
Thanks for the help. However, i guess my discription of my problem was off. I took it to my indy shop and my tranny is shot. They are going to look for a rebuilt tranny. Does any one have any idea of the cost i should be looking at. They charge $75 per hour for larbor.
Thanks again.
I think i am looking at $7,000 for a rebuilt tranny with 12 months and 12,000 miles warrenty. This includes labor from my indy shop. Does this sound corect?
Only thing I would think would make the "jake brake" kind of sound in the trans would only be in the differential attached to the transmission. When a pinion gear gets loose in a straight-axle differential for example, it could make some growling like sounds. Transmission itself, I am not sure but you never know?
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