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Unread 08-16-2013, 02:28 PM   #1
muirtons1
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Wj my wj 4.0 litre will not rev past 3500rpm HELP !!


Hi , all , i just bought a year 2000 WJ , 4litr auto , it has been great for two months then yesterday it wouldnt rev past 3500 in any gear or even neutral , i have replaced the TPS and the TOS to no avail , i have had the car serviced thoroughly and it is now officially driving me nuts , there are no codes showing , no engine check light on and my local garage is at a loss as am i ,if anyone can help out with a cure it would be a godsend , i cannot however pop round as i live in the highlands of scotland so as i say if anyone can help it would be appreciated , thanks all

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Unread 08-16-2013, 02:37 PM   #2
ChrisHager
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Is your throttle cable binding somewhere? Is the throttle arm on the intake manifold hitting anything? Is there an empty coke bottle under the gas pedal?
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Unread 08-16-2013, 03:33 PM   #3
muirtons1
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Hi , thanks for the advice but unfortunately for me all is well on all three counts ,thanks anyway
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Unread 08-16-2013, 06:33 PM   #4
michiganmaveric
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Possible blocked cats/exhaust.
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Unread 08-17-2013, 02:27 AM   #5
muirtons1
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Hi , once again , ok on the exhaust/cat front but thanks
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Unread 08-17-2013, 02:30 AM   #6
ssands85
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So did you change anything, or just go out to start it and it wouldn't rev past 3k?
Also check your air intake tract. Make sure nothing is blocking that in any way...... does it smoke or chug when you try to rev it.
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Unread 08-17-2013, 07:04 AM   #7
muirtons1
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when it goes up to 3500 rpm it will not rev any more and it does chug a bit , i will check all the air stuff and get back to you asap , oh and its appreciated
Alan
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Unread 08-17-2013, 08:12 AM   #8
michiganmaveric
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Quote:
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So did you change anything, or just go out to start it and it wouldn't rev past 3k?
Also check your air intake tract. Make sure nothing is blocking that in any way...... does it smoke or chug when you try to rev it.
Good catch, forgot about intake. My parents years ago had mice fill the air cleaner with dry dog food and when they would accelerate it would block the air flow creating the same problem as OP.
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Unread 08-17-2013, 03:55 PM   #9
muirtons1
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bad news guys , took it out after double checking everything again and it is getting worse .2500 revs is the max now , i am now getting really screwed up with this car , i do not understand what is going on , in a week it has gone down progressivly from full revs to which is now a little over tickover and it will not do more than 15mph now , unbelievable , i am at a loss ..................
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Unread 08-17-2013, 04:31 PM   #10
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What about fuel pressure. Have you changed the fuel filter? Might want to have the garage check the pressure with it running,
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Unread 08-17-2013, 04:43 PM   #11
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Here is a thread from the cherokee forum you might want to read. Last post fixes it.

http://www.jeepforum.com/forum/f11/w...hoked-1480744/

Forgot to past the thread, sorry.
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Unread 08-18-2013, 01:19 AM   #12
muirtons1
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I will ask my mechanic to have a look at this but i am getting loads of pressure from the rear of the exhaust , if i put a rag over the end it will push my hand away , i will however check this out , many thanks again , i will have to have the car recovered however as it will only do around 8 mph now !!
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Unread 08-18-2013, 05:23 AM   #13
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Check the fuel pressure.
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Unread 08-18-2013, 12:47 PM   #14
muirtons1
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Thanks and i will most definately have the pressure checked tommorow and i will keep in touch , is this the most strange thing to happen , no codes and performance steadily getting worse , here is hoping it is an easy fix , surely it must be mechanical with no codes or no dash lights showing ? thanks again all here is hoping
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Unread 08-18-2013, 05:07 PM   #15
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are you sure the check engine light isnt burned out?
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