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Old 06-18-2013, 11:24 AM   #1
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1997 4 cyl. whistling when up to temp

Hi,

I've read a ton of posts about issue but they all seem to be dead ends on the solution (unless I missed something). Hopefully someone out there can validate what I'm thinking???

Purchased this Jeep last week. Test drove and didn't have any problems. Got on the road home and noticed this whistling noise coming from the engine. Here are the symptoms.

- cold engine, any rpm: no noise, idle is ok
- engine @ operating temp: idle is high, whistle noise from engine
- removed air box to try and isolate the sound
- When spraying WD-40 and Carb Cleaning on the intake/exhaust manifold's gasket the engine bogs down then goes back to idle (rough)
- further visual inspection looks like the manifolds gasket, throttle body gasket have been changed recently
- additionally, wires going to some sensors to the TB look like they have been replaced, or re-taped
- finally, looks like the idler, and tension pulley's, rotor and wires have been replaced

I'm fairly confident that the problem is one of a few things: gasket is not seated correctly, manifold bolts not tight, crack in a manifold, crack in the head.

Please let me know what you all think and what direction I should go. I am very comfortable turning wrenches but need a suggestion for the best service manual I can get - the online Chilton manual isn't what I expected...

Thanks!
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Old 06-18-2013, 04:21 PM   #2
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Location: Western Massachusetts
Posts: 466
Buddy had a Ford that did something similar. Was a vacuum issue. If I remember correctly, the PCV valve was clogged. Its an easy check, take it off and sh-sh-sh-shake it. Moves its good, no movement bad. And they are cheap. Hope it helps, good luck!

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Old 06-19-2013, 06:30 AM   #3
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Quote:
Originally Posted by Verf View Post
Buddy had a Ford that did something similar. Was a vacuum issue. If I remember correctly, the PCV valve was clogged. Its an easy check, take it off and sh-sh-sh-shake it. Moves its good, no movement bad. And they are cheap. Hope it helps, good luck!
Thanks for the heads-up. Took it to a shop yesterday. The wrench made the sound change by playing with what he told us was the MAP sensor line/hose. He tried to source it with no luck.

I got home and was able to reproduce his "fix" but it turned out to be the CCV connector at the manifold side, not the MAP line. Im trying to source that part myself now. Even if I have to buy the whole thing (from the valve cover to the manifold).

I still was leaning toward the intake man gasket. Found out it has an aftermarket header. Again sprayed carb cleaner on the manifold and watched the engine react. Seems the engine right side of the man is not seating correctly. Tonight it's the manifold bolts. Gonna back the out and retorque.
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