Question about 1994 Jeep Wrangler

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While in a idle it would ilde ok then drop down but would come back up and idle and now it races up to 3000 3500 rpms we discontected both the tps and tbi no change then took off the vacuum to the map sensor it dropped down but still not right

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  • Contributor
  • 27 Answers

Idle air control valve is bad.

Posted on Oct 19, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Posted on Jan 01, 2009

clarktravis8
  • 74 Answers

SOURCE: go to stop rpms drop jeep liberty shuts off

Here are some things that I have run into. First any sensor cam/crank/tps etc..) that has a reference voltage from the pcm can cause this issue these sensors,(ESPECIALLY THE CRANK SENSORS or CAM Sensor) CAN SHORT OUT INTERNALLY. THIS WILL CAUSE A NO START CONDITION AND A "NO COMMUNICATION" ISSUE WITH THE PCM causing stalling. here are some things that I have run into. This condition has caused numerous unneeded pcm replacements. It gets difficult to diagnose when its an intermittent problem.sometimes a tech will install the pcm and let the jeep leave. Then when temp is right, the sensor shorts and it all happens again. Often by the time the jeep shows up on the hook the engine has cooled and the short is gone. In this case the tech has nothing to go on. YOU MOST LIKELY WONT HAVE A CODE HERE. THIS IS HOW I DIAGNOSE THE ISSUE. WHEN THE CONDITION IS PRESENT (NO COMMUNICATION") with THE KEY ON, START DISCONNECTING EACH SENSOR THAT HAS A REFERENCE VOLTAGE. START WITH THE CRANK SENSOR. IF YOU SEE THE SCANNER GET COMMUNICATION, THEN YOU FOUND THE SHORTED SENSOR.this CAN BE A PAIN IN THE @** IF THE CONDITION IS INTERMITTENT.
PLEASE NOTE: IT IS EXTREMELY RARE THAT THE PCM ITSELF HAS CAUSED THIS CONDITION. 99% OF THE TIME ITS A SENSOR SHORTING OUT, WIPING OUT ALL COMMUNICATION. ALSO NOTE:I HAVE NEVER SEEN THIS CONDITION ACTUALLY DAMAGE THE PCM. ONCE THE SHORTED SENSOR IS REPLACED, THE PCM IS FINE. THERE IS A RESISTOR IN THE PCM THAT PROTECTS IT FROM THIS. Good Luck and I Hope this will help resolve your issue. Please Rate Me. For any further assistance you can always ask me
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Posted on Apr 25, 2009

  • 6982 Answers

SOURCE: 96 Jeep Cherokee RPM Surge While Driving

If the problem began before you changed the plugs that they are likely OK...Some engines "like" certain brand plugs better than others. You may have a weak ignition coil. Poor spark will generally show up at higher rpm's. Spark should be blue and have good "snap" to it and should easily bridge a 1/4" gap or better. If fuel was contaminated, it should show up at lower rpm's as well. System cleaners sometimes work but often are added far too late to do any good. (tank can hold up to a gallon of water without noticing it.) I use 3oz of acetone and one oz marvel oil per 10 gallons of fuel about once a month...cheaper and more effective than most cleaners. (and does not "melt" gaskets and seals as legend has it) The vehicle speed sensor can also give you problems but needs testing to determine if it's got any problems.
It's difficult to diagnose by remote control, but I hope you benefit form something here!

Posted on Jun 12, 2009

01fordeb
  • 1033 Answers

SOURCE: 99 jeep grand cherokee 4.7 v8 oil pressure

Oil gauge may be bad, you said you changed the oil sending unit, and tried a aftermarket which worked, so the other option is to have you oil gauge checked. The sending unit may be good but you gauge is not reading proper.

Posted on Jan 12, 2010

  • 145 Answers

SOURCE: 99 Jeep Grand Cherokee 4.7 Oil Pressure reads 40

I'm having the same problem. Did you get yours fixed?

Posted on Jan 12, 2010

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How i clean the TPS sensor of a ford escape xls 2011 2,5 Lt l4 mecanic


it sounds like it's the idle air valve this controls the idle and drive rpm's when you step on the gas does it sometimes at idle go up & down by itself repeatedly? it could be something hitting the throttle and when you press down on the gas or shift it is knocked out lowering to normal idle/rpms, the tps is on the throttle body and is connected to the throttle lever and most likely right on the other side of the lever a little switch with a electrical plug on it search it so you can see what it looks like if you don't know already they are sealed and can not be cleaned you must replace it try checking with the car in park engine running and raise the idle by the throttle lever if it goes smooth up and down return to rpms that's not it if it races or sputters and then raises up that's it or it could be both units are blown out needing to be replaced

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Throttle body removed and replaced


I'm not a chevy guy, but I think you need to reset the throttle position sensor (TPS) once it's disconnected.

For idle, the throttle plate is almost closed with just a little air getting through. For more air, an IAC idle air control valve lets more air in to maintain an ilde speed. The TPS tells the engine computer when the throttle plate is closed and then the computer tells the IAC to let more or less air in to maintain idle.

So, as long as you reconnected all the connectors you took off, I'm guessing you just need to make some readjustments. Calling your Chevy dealer service department, they can tell you if that's true.

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