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Unread 07-19-2011, 04:24 PM   #1
D3V0311
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Revs real high like gas pedal is stuck!

97 grand cherokee laredo 4.0L 6cyl. select track 4x4.....131,000 miles...

aight so heres the low down, i drove to my parents house twice today (back n forth) to move some stuff, ran fine all day, soon as i was leaving turned it on like normal and the rpms went wayy up like i was stepping on the gas.thought it was odd so i just it off n started again. same thing as soon as put it into drive it jerked (such high rpms) but my foot was on the brake and the rpms went back down to about 1000. so when its in park or neutral itll rev super high but when in drive its fine..the issue is when i let off the brake the jeep wants to drive its self, it accelerates and even shifts fine but i dont have to even have my foot on the pedal... i looked to see if the throttle cable was stuck and it doesnt appear to be, also my display center is flashing like the battery went dead or disconnected, cables and terminals are really tight and clean, but all my radio stations are still preset...any body got any ideas of wtf is goin on?...no check engine light on

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Unread 07-19-2011, 07:12 PM   #2
D3V0311
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anybody got any ideass???
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Unread 07-19-2011, 07:28 PM   #3
Ohno50
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Could be the Idle air controller or an vacuum leak if it's constant
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Unread 07-19-2011, 07:34 PM   #4
D3V0311
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if i had a vaccuum leak wouldnt it act up when its in drive also?
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Unread 07-19-2011, 07:48 PM   #5
Ohno50
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It's just more noticeable with no load. It slams into gear when the RPMs are higher, but the then it's not as noticeable. Depends on how big the leak is. The higher RPMs means the engine is getting more air from somewhere. Which to me means IAC or a leak. IAC could be intermittent.
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Unread 07-19-2011, 08:18 PM   #6
D3V0311
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im gunna pull the IAC and check it here in a minute, how would i diagnose a vac leak or where one is at
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Unread 07-19-2011, 08:23 PM   #7
Ohno50
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Check all you vac lines. Look for a cracked/broken tube. Or a tupe tgat has been pulled from the intake. If it's bad enough you'll hear the hissing.
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Unread 07-19-2011, 08:34 PM   #8
Candymancan
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a vacumm leak would make a hiss if its really bad, and rpm's can be high when its leaking.
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Unread 07-19-2011, 10:05 PM   #9
D3V0311
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could id screw up anything else if i drive it like this till i get it figured out..i have to have a vehicle to drive
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Unread 07-20-2011, 05:37 AM   #10
Candymancan
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I dont think so, just your gas mileage lol. How high is it reving exactly ?
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Unread 07-20-2011, 07:26 AM   #11
melk
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Pull off your battery cables to force the PCM to reset.
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Unread 07-20-2011, 07:32 AM   #12
woodscavenger
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Check the VIN, maybe it's really a Toyota
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Unread 07-20-2011, 08:08 AM   #13
97zjdriver
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It sounds like the tps. Had the same problem when I was in nc. It got wet and would idle realy high intill it was in gear. Bought one at the parts store for like 56 bucks but it fixed it. You could also try to put a hole in it to try to let it dyr out if it may have gotten wet

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Unread 07-20-2011, 01:11 PM   #14
ratmonkey
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If it is slamming into gear it WILL destroy the transmission very soon. These transmissions don't take shock loads well at all.

Find the leaks soon or pay the price.
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Unread 07-20-2011, 02:08 PM   #15
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Quote:
Originally Posted by woodscavenger
Check the VIN, maybe it's really a Toyota
Ha. Give this man a beer.
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