Can't keep speed up in the mountains - JeepForum.com

 
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post #1 of 14 Old 04-10-2011, 12:35 PM Thread Starter
nicksdsm
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Can't keep speed up in the mountains

I took a drive out to the mountains last week. Some of the mountains are steep but the majority aren't to bad. After about 20 minutes of driving up and down the mountains my XJ started to feel like it was struggling to speed up or keep a constant speed (like the brakes were engaged). In the beginning I was traveling at approx 60 mph and at the end it wouldn't go over 25-30 mph. At one point I had to stop because I though something was wrong. After about a 10 minute rest, I continued on. At first it was fine but it quickly started doing it again. After my trip I didn't drive my jeep for a few days. Yesterday I drove on a flat highway for about 3 hours. Towards the end of my trip my XJ started to have a problem keeping a constant speed. No matter how hard I pressed the gas it kept wanting to slow down. The engine temp was normal at 200-210. I'm thinking the tranny is getting overheated. After I stop my jeep I don't smell anything out of the ordinary. I spoke to a friend who is a mechanic. He said the problem is probably the cats going bad. Any Ideas???

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post #2 of 14 Old 04-10-2011, 03:37 PM
scavok
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Are your RPMs going high when you are trying to keep speed?

If its a manual trans - when I cruise in the mountains I keep it in 4th gear, 5th is useless uphill for too long.

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post #3 of 14 Old 04-10-2011, 04:49 PM
srmitchell
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Sorry, I'm on my phone, but what's your setup? Lifted? Tire size/gears? And which tranny?

If it's the aw4, check the fluid.

Also, check all vacuum lines, and clean your throttle body. Don't rule out dirty, or bad sensors.

Mine cruises up huge hills in 3rd gear all day long.

I work on Mopars
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post #4 of 14 Old 04-10-2011, 05:53 PM
scavok
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one more thing to check is your air filter. High altitude and a bad filter will drop performance too.

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post #5 of 14 Old 04-10-2011, 06:39 PM
Texsun
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if your tranny is auto is sounds like its getting over heated... but idk
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post #6 of 14 Old 04-11-2011, 04:00 AM Thread Starter
nicksdsm
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It's a auto tranny. I'm lifted 3-4 inches, 30 inch tires. stock 3.55 gears (I think).

The RPM's won't go up. It's not reving out.
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post #7 of 14 Old 04-11-2011, 04:18 PM
scavok
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If it isnt revving up or sticking i doubt its the tranny, i'd bet on air or fuel flow. How are your filters? Is it ever hard to start up?

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post #8 of 14 Old 04-12-2011, 05:51 AM Thread Starter
nicksdsm
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I have a newer k&n 9 inch cone filter. It's not dirty and it's never hard to start. It's always turns over on the first try.
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post #9 of 14 Old 04-12-2011, 08:24 AM
jeeptorino68
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hows the fuel filter?
how about the condition of the throttle body> is it filthy?
also is the kickdown cable properly adjusted?

Kyle
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post #10 of 14 Old 04-12-2011, 08:32 AM
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X2 what Kyle said....If it's not kicking down into lower gears something is going on with the tranny...now there may also be something else such as a clogged cat that is causing the loss of power.

Miles? Original Cat?


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post #11 of 14 Old 04-12-2011, 08:33 AM Thread Starter
nicksdsm
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The Trans does shift, the engine just wont rev.

I'm not sure about the fuel filter, It's probably dirty. I have a new, clean 63mm TB. What is a kickdown cable?
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post #12 of 14 Old 04-12-2011, 08:40 AM
XJH-007
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Uhhhhhhhhh the trans shifts but the engine speed doesn't change??

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*00' XJ_T-n-T Y-Link/6" RE_OME's_33" KM2's
Tera 4:1 / 4:56's_Elec. Locked D44
**84' CJ7 4"BDS 33's
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post #13 of 14 Old 04-12-2011, 09:25 AM Thread Starter
nicksdsm
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The trans shifts down the RPM's raise but no matter how far I push the gas down the engine won't speed up.
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post #14 of 14 Old 04-12-2011, 09:50 AM
lowicz96
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Sounds like either air cant get in, exhaust cant get out or fuel isnt getting in. I would try the cat 1st, when they collapse you lose a bunch of power

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