Engine whistle? Help 95 YJ 4cyl. - JeepForum.com

 
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post #1 of 6 Old 01-20-2010, 10:53 PM Thread Starter
zhahn888
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1995 YJ Wrangler 
 
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Engine whistle? Help 95 YJ 4cyl.

Hey guys. I recently swapped my 2.5 TB to a 4.0 TB and noticed a little difference.. The past few days as i would accelerate i noticed a small whistle coming from the engine. It comes and goes both getting louder and quiteter, but im down at school and worry about anything going wrong. Should i worry or could it be a gasket leak?


95 YJ 4 cyl./ 31x10.5 MTR/ Smittybilt SRC/ Hella 500FF Lights/ 4.0 TB/ Cherry Bomb Exhaust
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post #2 of 6 Old 01-20-2010, 11:22 PM
TheDustMan
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Easy way to tell would be to buy a vacuum gauge and hook er' up. Make sure the vacuum source is POST-throttle, not pre-throttle. And if you need a little coercing to buy the gauge, let me tell you; if you take care of it, it will be a very valuable tool to have on hand in your garage. Useful for everything from detecting clogged exhaust to cam timing to misfires.
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post #3 of 6 Old 01-21-2010, 09:09 AM
SeanB95YJ
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by chance when you did the larger TB, did you also install a TB spacer? they're known to whistle, especially the power-aid ones with the helical bore.

Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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post #4 of 6 Old 01-21-2010, 10:31 AM Thread Starter
zhahn888
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I did not use a spacer but i do plan on getting one soon... All we really have around here is a autozone could i get a vacuum guage there? Thanks again!

95 YJ 4 cyl./ 31x10.5 MTR/ Smittybilt SRC/ Hella 500FF Lights/ 4.0 TB/ Cherry Bomb Exhaust
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post #5 of 6 Old 01-21-2010, 10:51 AM
gojeep91
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Quote:
Originally Posted by zhahn888 View Post
I did not use a spacer but i do plan on getting one soon... All we really have around here is a autozone could i get a vacuum guage there? Thanks again!
I did this once, I put the plate on backwards and it fit except for one spot in the back that it just barely overhung the gasket. It whistled pretty loud when under throttle but almost none at idle. This might be the solution, but might not.
good luck and let everyone know for future searches.

My simple '91 YJ build.

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post #6 of 6 Old 01-21-2010, 01:46 PM
TheDustMan
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Quote:
Originally Posted by zhahn888 View Post
I did not use a spacer but i do plan on getting one soon... All we really have around here is a autozone could i get a vacuum guage there? Thanks again!
They should, it's a pretty common piece of equipment. I would do the easy thing first and check your vacuum, tell us what the needle does at idle, when you rev the engine and let it settle back to idle, and then rev the engine to about 2000 RPM and hold it there.
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