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Unread 01-20-2010, 09:53 PM   #1
zhahn888
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1995 YJ Wrangler 
 
Join Date: Jan 2010
Location: Ohio
Posts: 10
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?

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95 YJ 4 cyl./ 31x10.5 MTR/ Smittybilt SRC/ Hella 500FF Lights/ 4.0 TB/ Cherry Bomb Exhaust
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Unread 01-20-2010, 10:22 PM   #2
TheDustMan
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2007 KJ Liberty 
 
Join Date: Jul 2009
Location: Morton, Illinois
Posts: 519
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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Unread 01-21-2010, 08:09 AM   #3
SeanB95YJ
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1995 YJ Wrangler 
 
Join Date: Nov 2009
Location: Schenectady, New York
Posts: 1,184
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.
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[FONT="Comic Sans MS"][COLOR="Blue"]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
[/COLOR] [COLOR="Red"]swap/build thread: [url]http://www.jeepforum.com/forum/f22/after-almost-4-years-finally-my-own-build-swap-thread-1542284/[/url][/COLOR][/FONT]
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Unread 01-21-2010, 09:31 AM   #4
zhahn888
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1995 YJ Wrangler 
 
Join Date: Jan 2010
Location: Ohio
Posts: 10
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!
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95 YJ 4 cyl./ 31x10.5 MTR/ Smittybilt SRC/ Hella 500FF Lights/ 4.0 TB/ Cherry Bomb Exhaust
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Unread 01-21-2010, 09:51 AM   #5
gojeep91
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1991 YJ Wrangler 
 
Join Date: Apr 2009
Location: Washington
Posts: 34
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.
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Unread 01-21-2010, 12:46 PM   #6
TheDustMan
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2007 KJ Liberty 
 
Join Date: Jul 2009
Location: Morton, Illinois
Posts: 519
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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