2007 Compass - High whiny engine at startup and low speeds. - JeepForum.com

 
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post #1 of 7 Old 07-16-2013, 11:45 AM Thread Starter
benlaw2006
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2007 MK Compass 
 
Join Date: Jul 2013
Location: Midvale
Posts: 5
2007 Compass - High whiny engine at startup and low speeds.

Hello all. I have a 2007 Compass - automatic transmission with almost 57K on it. I have been the only owner/driver. Past relevant problems include a blown fuse that was causing the headlight and interior lights to malfunction (fixed) and a battery that leaked all sort of acidy goodness on the positive terminal. New battery and I'm getting more corrosion about 2 years into it.

Problem lately has been a high idle when I first start the car, up to about 1750 RPM. Within 30 seconds the idle drops to about 500-750 which in itself hasn't been alarming, but started the same time as the following issue The other issue is that the car has had sort of a high whine when I'm traveling less than 20 MPH (like around my neighborhood) and seems to have a little delay and even a small hiccup in downshifting. If I shift the vehicle into neutral the whine goes away and doesn't come back if I shift back into drive. The car seems to be driving fine - certainly is ok at high and constant speeds, but the whine is noticeable at lower speeds and city driving with a lot of starts and stops and turns. I don't like the high whine and wonder if it portends problems in the future.

I live in Utah. It has been between 90 and 105 F for several weeks.. The car is in the sun all day. No noticeable change in gas mileage which has always been terrible (18-22 MPG the entire life of car)

I am wondering if the problem is transmission related and whether I should have the 60K service sooner (because that includes a transmission flush) or if it is perhaps battery related. Engine oil is fine, but I am also due for a checkup.

Any ideas?

TLDR? High whiny engine at startup and low speeds.

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post #2 of 7 Old 07-16-2013, 04:52 PM
FujativeOCR
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2011 MK Patriot 
 
Join Date: Aug 2011
Location: Newfoundland
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I'd try the tranny flush. I only have 30k but already planning to do it around 60k based on other reports. Also, I feel your pain on the mpg. Mine sucks too.
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post #3 of 7 Old 07-17-2013, 12:41 PM Thread Starter
benlaw2006
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2007 MK Compass 
 
Join Date: Jul 2013
Location: Midvale
Posts: 5
Thank you!

Yeah - I'm thinking that's the best idea. Car has done well until now (except for gas mileage)

Thank you for your response!
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post #4 of 7 Old 07-29-2013, 12:13 PM Thread Starter
benlaw2006
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2007 MK Compass 
 
Join Date: Jul 2013
Location: Midvale
Posts: 5
Fixed problem - wasn't the tranny

This problem has been resolved - it actually was the alternator going out. Car runs fine now. A bit pricey of a repair, though to do at the dealer. ($690 - My wife nearly killed me for spending that on a new alternator)
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post #5 of 7 Old 08-06-2013, 06:43 PM
icemanang
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2007 MK Compass 
 
Join Date: Aug 2013
Location: hewitt
Posts: 3
tranny help please

i just had the a/c compressor replaced and tie rod and ball joint . soon after the transmission temp light went on and since it was whinning i added trans fluid and it was fine for local driving . on a trip about 20 miles the light went on again car slowed almost to a halt . i let it cool down and drove it to the transmission shop he drained and flushed the trans and said he cleared the temp light . he said there were no more codes . of i went and 20 miles later same thingcould the guy have put the wrong ac in or put the belt back the wrong way . anybody have some info please
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post #6 of 7 Old 08-06-2013, 08:32 PM
FujativeOCR
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Location: Newfoundland
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Quote:
Originally Posted by benlaw2006
This problem has been resolved - it actually was the alternator going out. Car runs fine now. A bit pricey of a repair, though to do at the dealer. ($690 - My wife nearly killed me for spending that on a new alternator)
What was your wifes alternate solution?
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post #7 of 7 Old 08-23-2013, 03:23 PM
kevinw2345
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2008 JK Wrangler 
 
Join Date: Aug 2010
Location: London, Ontario Canada
Posts: 42
I have noticed on my 08 compass limited 4x4 that when I am idleing my tranny or something whines or whistles. I put the car is neutral and it goes away.
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