Started with the common CPS/CKP failure and now is Completely out of hand
Hi, new member and first time poster in a purely frustrated state.
1997 Jeep XJ Stock
It all started when I drove through an easy trail to learn the new jeep. It started stalling and bucking 3/4 of the way through the trail, but I managed to limp home to my garage. I put my scan tool (not a cheap canadian tire code reader) on the jeep and read CPS/CKP. 200 bucks later on that and still have the missfire/stalling going uphill. Over the past couple weeks I have trouble shot and changed everything I could think of.
here is a list of things I have checked so far:
• 02 sensor not throwing code
• Cat has flow
• Fuel injectors impedance is normal
• Used SKF stethoscope to listen to injectors
• Temp sensor changed
• Mass air sensor not throwing code
• TPS changed
• CPS changed
• Pickup coil
• MAP sensor changed
• EGR N/A
• Fuel Pressure within normal
• Spark Plugs new
• Wires new
• Cap and rotor new
• Coil pack
• Timing indexed
• Deleted old codes and reset computer
• No slack or noise in the timing chain.
jeep has 200 000km (124 274.238 miles)
So.... I get all of this completed thinking NOTHING can hold me back now, I turn the key it starts nicely, rev's to 2 grand and starts to lower RPM's but sticks at 1500 (insert expletives here!). I figure High idle... I can change that later lets take her for a slow ride up the hill 300 ft from my house and before I even get to the hill its sputtering and bucking...no codes... i am not mechanically challenged (except for this instance it would seem). I really don't want to let this Jeep beat me. please if there is anything I have overlooked?
if there are any Jeep experts in SSM Ontario or Michigan please P.M me.
ANY thoughts or suggestions will be greatly appreciated.
I am tempted to check that, but my fuel pressure is in a good state, which usually indicates that it's not clogged. if the pressure was low then I would pull the tank and change the pump etc.. I am at the point now where I may buy a jeep with a broken frame for the parts, but I don't know for sure if the parts are interchangeable. (1995 Jeep Grand Cherokee).. If the motor/trans/gas tank are then I will pick the machine up for a couple hundred. thanks for the thought.
The 97-01 fuel filter is only serviced if fuel pressure testing indicates reduced flow or pressure.
Swap the Fan relay with the ASD relay and the fuel pump relay with the starter relay.
Bucking and Stalling are most commonly associated with the O2 sensors. Normal O2 sensor service life is about 125-150,000 miles. The sensors can become slow to react, or contaminated, and will cause the ECU to become confused resulting in bucking and stalling. Often, a faulty O2 sensor will not throw a code. Inspect the O2 sensor wire plugs and wires for damage or corrosion. Replace the O2 sensors with genuine Jeep parts or NTK sensors. Also inspect all the other sensor wires for chafed insulation or melted insulation.
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so I have changed both 02 sensors with no change..... and swapped the relays.. still no change.. I am seriously stumped... I honestly don't know which direction to go.. it idles at 2000 rpm and lowers in drive.. as soon as i put it into drive it decides it wants to chug and try to die..
You said 'Fuel pressure within normal'. What fuel pressure do you see with the engine running at idle? Have you looked at the fuel pressure with the engine running at above idle - like at 1500 - 2000 RPM?
Do you have a Factory Service Manual that you can refer to when performing a fuel pump capacity test?
I got my Idle to come back down to normal, but it still stalls out only when it is in drive... I tried out of curiosity and frustration to put it in reverse just to see.. and the stupid thing didnt stall... as soon as i put it in drive it stalled out... almost instantly..
Again as someone else asked are your TPS and CPS Mopar or at least NAPPA there are many of us on here that tried to save some $ I just recently bought a 4 WD selector switch from A Zone and it failed right out of the box,went to Nappa and got one and no problems.If you are dealing with Big Box stores those parts are almost allways out of spec.and if they do work they usually only last a very short period of time.Worst part is if they fail you while out wheeling.
got my TPS and CPS from nappa as a friend works there and i get parts for cost... tomorrow I am checking for cracks in the flywheel, if there are none, then I will go to the dealer.. even though I do have a hard time reasoning with the new sensors being non compatible because of being aftermarket. Is this aftermarket sensor problem a truly common thing with these cherokees?