what is a STFT B1(%) -1.56. WHAT DOES THAT MEAN?
Posted by spauldingw... on
Here is some general information to get you started...
(I am quoting directly from several PDF sources, Googled).
STFT B1 = Short Term Fuel Trim Bank 1. This is the fuel correction percentage being used by the closed loop fuel strategy for Bank 1 (if a V style engine or for all cylinders if an inline engine). If the fuel system is in open loop, this number will be reported as 0%
Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim includes short–term fuel trim and long–term fuel trim.
Short–term fuel trim is the short–term fuel compensation used to maintain the air–fuel ratio at its ideal theoretical value. The signal from the heated oxygen sensor indicates whether the air–fuel ratio is RICH or LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air–fuel ratio is rich, and an increase in fuel volume if it is lean.
Long–term fuel trim is overall fuel compensation carried out long–term to compensate for continual deviation of the short–term fuel trim form the central value due to individual engine differences, wear over time and changes in the usage environment.
If both the short–term fuel trim and long–term fuel trim are LEAN or RICH beyond a certain value, it is detected as a malfunction and the check engine warning (CHK ENG) lights up.
If the total of the short–term fuel trim value and long–term fuel trim value is within ± 25 %, the system is functioning normally.
Posted on Apr 09, 2010
Need fuse diagram from 1998 Jeep Grand Cherokee. Don't have owner's manual. The fuse box under hood has words on it, but not the one inside on passenger's side near floorboard
Posted by gavinlee02 on
Check several documents about this:
1. 1998 | JEEP | GRAND CHEROKEE Go to
- User: greatfalls / Pass: publiclibrary
- Select Auto Repair Reference Center>> 1998>> Jeep>> Grand Cherokee>> Model
- Repair Procedures
- Chassis Electrical>> Circuit Protection
2. Engine Fuses
Posted on Jul 21, 2009
I need a diagram for 1998 jeep grand cherokee vacuum hoses
Posted by sabrosa412 on
Hello this should help you
Posted on Jan 09, 2011
fuel filter location 1998 jeep grand cherokee loredeo
Posted by richkohio on
The fuel filter sits on top of the fuel pump. It is the fuel fuel filter/fuel pressure regulator. You will have to drop the gas tank to access it. Hope this helps.
Best of luck
Posted on Jun 19, 2010
where is the location on the engine to replace coolant temp sensor for 1998 grand jeep cherokee 5.2L?
Posted by ewneal on
1998 Jeep Grand Cherokee 5.9 V8. Radiator cooling fan motor burnt up. Need to find replacement. What we are finding only have 2 wires coming out of motor, we had 3. Connecting wires have 3. What do these three wires do and where can we find the correct part? We have been quoted everything from $63 (for the one with 2 wires) to $700+ (the guys swears this is what we need and can order it). Help!
Posted by Anonymous... on
Since the 5.9 electric fan motor cannot be purchased anywhere but from the dealership and for several hundred dollars, here's how I replaced mine. 1998-2000 Ford Crown Vics, Lincoln Town cars and Mercury Grand Marquis have exactly the same electric motor in them with a different style 3 wire connector. The part # at Autozone is PM9069, comes with a lifetime warranty and cost me 119.99 on 8-30-08. The only trick is getting the connector from the junkyard from one of the above vehicles. I got one from a Grand Marquis and a second from a Lincoln 100 feet away (I have 2 5.9s and I'm planning for the future on the second one). If you're really pressed for cash, take the motor from the junkyard too and hope it works. Watch the Lincolns as they have the correct motor and connector on the driver's side of the radiator and a second motor on the passenger side of the radiator which only has a 2 wire connector. If you get this connector and/or motor you'll only have hi speed or low speed depending on how you wire it, but not both. I cut the connectors off with about 6 inches of wire. The 2 connectors cost me $5. Once you've removed your old fan motor from the fan blade and the shroud and you have it sitting on the top of the radiator still plugged in, sit your new motor with the junkyard plug in it beside the bad motor. The center wire is the ground. I think the right wire was the high speed and the left wire was the lo speed. The high speed wire is the red with white stripe wire. It doesn't really matter as the Lincoln wiring is a different color. As long as you cut the left or right wires at the connector on the harness side of the connector ONE at a time, strip it and attach it to the same left or right stripped wire on the connector on your new motor, it works perfectly. At the very least, put a piece of masking tape labeled either left or right on the two wires since it's easier to cut all three and then solder with the old motor out of the way. You need to solder these wires as there's a lot of juice going through them. Wire nuts will get corrosion in them and you'll have problems a couple years down the road. A pencil soldering isn't really hot enough. You need one of those trigger ones that get real hot as these wires are good size. If you happen to mix up the wires on your electric motor, it won't hurt anything. When the sensor in the driver's side upper radiator hose turns on the fan to low, it will always run on high speed instead of the intended low speed. The high speed sensor in the passenger side lower hose will basically not be doing anything because it would actually be turning on the low side of the motor. The high and low are seperate in the motor. You do not need the low side running to get the motor onto high. I've heard this debated and ran my new motor on high and low seperately with jumper cables to find out before I installed it. The only other consequence of incorrect wiring is when the AC is on which normally runs the fan on low, it will now run on high. It doesn't hurt anything and cools better, but it is noisier. I considered wiring it backwards on purpose to get more cooling earlier, but finally decided to wire it correctly and let the sensors do their job. You won't have any problems as long as you still have the original 150 amp alternator in there(56041 394AA on the silver sticker). You can't buy the 150 amp alternator at the parts stores. If somebody's put in a 90, 117, or 120 amp you could have some dimming when the fan kicks on. The 136 amp which is the biggest the parts stores list for a 96-98 grand cherokee would probably be okay. When the 150 amp ones go bad, it's fairly simple to put new bearings and brushes in them. The hard part is getting the pulley off. If you still have the factory thermostat in your 5.9 (it runs 210 on the temperature guage ALL the time), you'll notice your electric fan never shuts off. That's probably contributed to these fans burning up and seizing. The low side kicks on around 200 and the high side about 215. So with the original thermostat, the fan is on low as soon as the thermostat opens and never shuts off. Both my 5.9's had the fan running all the time when I purchased them, one with 22,000 and the other with 48,000 miles. Of course I ran to the dealership for a new sensor in the top radiator hose for one of them which did exactly nothing to fix the problem. I finally unplugged the harness from the low speed sensor, filled the sensor and harness connector with grease to keep out the corrosion, zip tied it to the power steering hose, and I've run both of them for 8 years or so with just the high speed sensor cooling things down. When the water pump went bad in one of them 2 years ago at 160,000 miles, I put in a 185 degree thermostat as well, plugged the sensor back in, and now it works perfectly. By the way, the 25 degree drop in temperature really cut down on my heat in the winter. If you live north of I-80 or so, I'd leave the original thermostat in there. Or go to a 195 degree thermostat. That's going to be real close on whether the fan will be running all the time or not. It should be okay, but you'll have the fan coming on every two or three minutes in city driving. What really wears these fans out is miles. When you're driving down the road and the fan is not running, it's still spinning like crazy in there from the air going through the radiator, and that's accumulative wear on the bearings. Back to the soldering, if you want a neat looking job, slide some shrink tubing on the wiring before you hook them together and shrink it down when you're done or use electrical tape. I ended up with 8 inches or so of excess wiring which I have zip tied to the radiator support just below the radiator cap. Now you've got a fan motor with a lifetime warranty. If it ever goes bad, you get a free one. Hope this helps other 5.9 owners, because I searched in vain for 3 months for a way to fix this. It wasn't until a Jeep mechanic mentioned certain Ford big cars had a motor like the bad one I was carring around that I got pointed in the right direction and found the years and models on my own. I was driving it around without a fan because I live in the country without much traffic. If you live in the city, you couldn't do that or risk melting the engine down.
Posted on Jun 06, 2010
just bought a 97 grand cherokee and every time I open the doors with key fob the seat move, How to I set the seat memory to the key fob ?
Posted by blade918 on
I had the same problem and had to kinda figure it out on my own. I have a 98 grand cherokee and I think they should be the same. Inside the drivers door panel there are 3 buttons... a number 1 and number 2 and a SET button. Hold down the set button for a couple seconds then release. Then adjust your settings on your seat and mirrors to what you want...Then press # 1. If you have another person that will be driving the car do the same and press number 2...
The thing is...........There are 2 key chain things issued with each car...One will be the number 1 driver, the other one is the number 2 driver...So...I would program the number 1 driver first and see which key chain thing works...then you will know the other one will be for the number 2 driver.
Hope that made sense...It is a great feature once you finally figure it out. Sheri
Posted on Mar 30, 2009
i need a vacuum routing diagram for a 1998 jeep cherokee
Posted by mudman269 on
Google; "1998 jeep grand cherokee vacuum hose diagram"...
Click on first choice...
Choose, top row from left to right, # 4...
Then click on diagram in the upper left corner of page; "See full image".
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
Posted on Dec 09, 2009
sun roof won't open - fuse or motor?
Posted by rollnthund... on
3 things are involved (fuse ,motor retractor ,and relay ) start by checking to see if the fuse is good then relay there a various relays all togather referance owners manual to find the right relay for inspection if all else fails and it is the motor retractor dont do it your self get an electromechanic to help
Posted on Apr 03, 2010
it starts but won't stay running
Posted by Craig... on
starts ok, and stalls.
if you had a scan tool connected it would tell you why! 90% time
first off stalls can be caused by 50 things....so guessing is out.
the first thing is did you try to prevent stall with a fast right foot?
yes, prevents stall easy or hard but does. this is first. !!!
2nd is , did you lose 12vdc power to dash ,lights and guages go dead at stall, Lost 12v power.
then the ASD probably dropped out, if it did we know why
because the PCM tells you why any time ASD drops.
ok ASD didnt drop, before stall.
bad spark, never ever to a 30k or 60k mile service,? spark parts. and filters>? (omg i thought all parts run 300k miles< no they dont)
flooding, is it flooding, google how to discover flooding.
lack of fuel, fuel starvation, 180degree back to filters.
Scan tool shows ECT at -39F? or dead. DTC errors or reads wrong.
leaking injectors. (or clogged) but the injector leak down and balance test never lies.
lots more. but ill stop.
Posted on Mar 19, 2015
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