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Old 07-11-2013, 03:15 PM   #1 (permalink)
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Default 91 jx sidekick 4x4 is slow over steep mountains

I have a 1991 jx two door 4x4 sidekick. I love my car but it can be slow when going over mountains. now I know they never really were really fast cars especially over steep mountains and I am just wondering if anyone could give me any advice or help with my situation because I have to make that drive a lot!. thank you in advance
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Old 07-11-2013, 03:22 PM   #2 (permalink)
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Cut a hole in the floor and Fred Flintstone it. (just kidding with you)
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Old 07-11-2013, 03:24 PM   #3 (permalink)
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Welcome to the forum!! Your car should be able to accelerate up just about any incline in 3rd gear. If it can't do this, there are a number of things you should check....first the engine timing, which can be checked by doing a compression test. Your spark plugs should be gapped at .028". You should make sure that your check engine light is on with the key on, and off once the car starts. Your cold idle when first starting the car should be around 2000 rpm, and it should reduce to a steady 800 rpm idle when the car is warmed up. If your car is bogging and hesitating, the EGR valve should be cleaned of decades worth of carbon. If you search the forum, there are instructions on how to do this - pretty easy with carburetor cleaner.
You may want to give some more info on how the car runs (when not on an incline) and what maintenance, etc., you have done to it.
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Old 07-11-2013, 04:01 PM   #4 (permalink)
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thank you for the reply I think its is probably about ime I change the timing belt on my Suzuki. my Suzuki is an automatic tranny and revs up to about 5000 rpms when climbing the mountain and peaks top speed at 55-60 mph going up. just driving around town it accelerates fine and drives nicely. when I start my car cold the beginning rpms is about 1200 and then settles down to 900 when it is heated up.
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Old 07-11-2013, 04:04 PM   #5 (permalink)
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and im sorry but what is a compression test?
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Old 07-11-2013, 07:45 PM   #6 (permalink)
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What kind of steep hill are we talking here? I have a pretty crazy grade that travel up into the mountains here in CA, and I can pull it in 3rd (auto tranny, bex was talking about the 5 speed -- you should spec your car in your signature...) at 55 when the car is light, but otherwise I have to drop to 2nd, which I never push over 45mph.
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Old 07-11-2013, 07:59 PM   #7 (permalink)
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I have a question...how does a compression test give any results as far as timing...either spark or valve?
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Old 07-11-2013, 08:35 PM   #8 (permalink)
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Quote:
Originally Posted by big ed View Post
I have a question...how does a compression test give any results as far as timing...either spark or valve?
Because, when the engine is timed (static), the valves will be closed when the piston reaches TDC, creating pressure. If out of time, the valve leak, lower pressure....

We are not discussing the ignition timing.... Philip
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Old 07-11-2013, 09:55 PM   #9 (permalink)
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thank you very much for the video that helps alot!! i also had another question and i was wondering if it may pertain to my timing as well. my automatic tranny tends to go up to high rpms before shifting gears especially when climbing hills. any thoughts?
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Old 07-11-2013, 10:02 PM   #10 (permalink)
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it is a pretty steep mountain im not certain what kind of grade it is but my car is a 1991 automatic two door jx convertible model and the fastest i can pull going up the mounatin is 45-50 mph.
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