Why is my jeep hesitating with loos of power she does not want to jump up & go! She runs like a top starts every , runs smooth every time. no clunks no clinks nothing & computer showing nothing / I drive at hill she "hesitates" 50 55 is it. come to slowly resume to 60 65. flats she holds 65 , pedal to metal she hesitates? like she wants to but like a clogg or something not open to set her free. When I get up around 70 she starts to take off like nothing going on & this is periodicly? But a def loss of power any idea's Jeep wrangler 2003 4cyl. 5 speed 4X4. I have changed & did the following , changed upper O2 sensor, change Pwr steering pressure sensor as both were bad , did spark plugs , oil change engine flush, throttle body cleaned , all sensor checked & dbl. check for connectivity wcomputer, Air filter changed ,comp not showing anything wrong, checked cats any idea's I need help!
Nice facts, all, but no engine size options stated.
after all it's an ENGINE question.
you dont know whats there, and doing DIY> really?
one fact missing, and is key
does WOT power CATCH up
that is you move right foot fast and it bogs, we get that but what happens after the bog> ? more bog or it catches up.
if it dont catch up;, on hills, maybe fuel pressure low.
see?
at WOT there is no 02 sensors. nor TPS (enrich)
at WOT only you , then engine sucking air like mad the MAF at max voltage and if fuel pressure is low the car has endless bog.
see?
wot, = wide open throttle, use a hill to test, flat is useless .
max fuel is at max HP (max torque + max RPM both same time)
i own an 08 wrangler, 3.8L stick.
i just sold my 02,. with 2.4L I4, it was a bogging engine day one out of factory its a gut less I4. (only tubo can fix it)
2.4 or 4.0 L.
ive own all of them 4 and 6cyl.
03/ wrangler 4Cyl/ 5 speed> doing most with help of mechanic friend of mine by phone as live to far away from him now. Also have used hil to test 50 55 is all she will do when reach top she starts to pick back up to around 60 65 but before same hills i was doing 60 65 hit in 3rd & she would take off 75 less then 10 seconds now lucky if she does 60 65 in 4th once in while she gets to 70 then wants to take off like nothing wrong// but most of time around 50 to 65 you can feel the hesitation. yes power will increase slowlyand as stated sometimes will have it other times cant get it there? and only catches up to 60 /65 when reaching top of hill if hill 4 miles long i am doing 50/ 55 for 4 miles unless pitch levels out and she catchs a couple miles up to maybe 60// well my 4 cyl has two 02 sensors one up by smaller cat and another down by bigger cat i changed the upper o2
& yeah has been useing alot more gas lately i think i am gonna change the 02 near the bigger cat as before changeing the upper one i had bucking problems untill i found 02 sensor wires fraid and broken changed that 7 plugs she ran like champ till this
yeah it ran around 90 bucks but was worth it
the rear 02 sensors are not for fuel injection, the are just a smog test. the rear sensors only run the 420 CAT test. the front sensors do that
also , all sensors, 02. dont operate ,when you accelerate. the only work during cruise and idle.
a tune up is best, (spark an filters) those fray wires are bad, they can short power to the ECU. and that is whole other matter, that.
goodluck to you.
as i beleive stated i changed plugs and filters/ and upper o2 because of wires
so basicly tune up was done plus new wires to plug's / air filter /
o yeah did i mention she run's smooth ideling and under drive / she just has this almost constant hesitation like smothing holding it back from opening and or taking off
yes, i can only state solutions to symptoms and tests. what you did , tune up wise, (gapped plugs right) etc, i cant guess... but does the enigne have full power, wide open throttle on a hill, this checks the FUEL pump to see if it can handle max fuel flow. so does it. this is one of the first things i do after a tuneup.
lest pretend it is tuned up right, by the book !, so tip in hesitation can , wrong fuel pressure, a bad TPS. lets start over, here and now.
i have only one question, what engine is in your car, im blind I cant see it.
or open hood, USA cars, look up and under see that EPA sticker ,sure, see the enigne stated there.? what is it.
in line 4, inline 6, or what?
i beleive i stated 4Cyl
if you would read line 11 it states>Jeep wrangler 2003 4cyl. 5 speed 4X4. I have changed
depends on what you call by the book #1 and just about all you have asked i have answered plugs they are non gap plugs new wires i beleive i stated all this// line 11 thru 16 on my questioning>> the following was stated>Jeep wrangler 2003 4cyl. 5 speed 4X4. I have changed & did the following , changed upper O2 sensor, change Pwr steering pressure sensor as both were bad , {{did spark plugs}} , oil change engine flush, {{{throttle body cleaned}}} , {{{all sensor checked & dbl. check}}} ""for connectivity w/ computer""", {{{Air filter changed}}} ,comp not showing any thing check engine light not on
Also i am taking it if the accelerator is working with out any sticking i am ssumeing that the throttle is completely opening // however i have found approx. a 1/ to 3/4 inch of play on throttle cable
I know they are to have a touch of give but would this be of an issue as well? since if stretched would only allow for throttle to open say at 75% to 80% instead of 100% or is it made like that ?
Add a CommentHell i am looking at every aspect // esp the two sensor connected to throttle body as have used throttle body cleaner in past not aware if spay gets into one of them could cause damage// how ever again nothing showing on comp.?? so ??
sorry this forum hides post, unless i hit the veiw previus botton.
ok the 2.5L just like mine, the engine runs off a MAP sensor.
that tune up skip spark plug wires to the coil pack all 4 wires.
now my ONE question, diagnosis, say your driving, and you drive up a hill , and floor the throttle, sure it hesitates, got that,but does it CATCH UP, that IS, the power returns for full power up the hill , this is an IMPORANT DIAGNOSTIC test. does it? or not? this check the fuel pump pressure. pretty good, with no tools.
if motor is healty and the spark, then its a fueling issue. The MAP sensor (and IAT) sets fueling rates on this engine. and with a fast right foot the TPS does the enrich, if bad, it bogs a bit and catches up, the MAP does that catchup.
so on the dash cluster, there is a lamp called CEL, is it glowing driving.?
glowing driving means the ECU is not happy and to use a scan tool to see why, its not happy.
CEL check engine light, or service engine soon, same-.
touch and give, what part?
two sensor connected to throttle body
when the engine hestiatates this is (not misfire (spark) this is caused by 2 things only.
1. wrong inputs (sensors) to the PCM(ECU) or 2: low fuel pressure.
your technician has a tool tha is called a scan tool, if the inputs are good. then its low fuel pressure or clogged injectors. (there are simple tests for eash)
back to the throttle body. here is a photo of it , it has only 1 sensor not 2.
but no matter what, all sensors count, the MAP is at #6, i just remove it and clean the vacuum port with due car. the TPS is good or bad and very hard to test. that is why I asked what WOT up hill does.? In the shop we have a chart that shows all map readings with all vacuum readings. so i dont have to guess if the MAP is good. I use a voltmeter, and bingo.
more? sure
all fuses good
keyon, does CEL lamp glow., if not fix that now or get a scan tool.
CEL glows key on, you drive, does lamp CEL stay out.
these are the first things.
if the CEL glows running, you must scan it.
if the CEL says out driving, then do my WOT test. please. up hill.
WELL IT'S A 2.4 & All panel lights go out after starting
if you were (touch) playing with the throttle cable, just leave it be it is never set tight, it you mess with it and it gets tight, the car will drive like a toyota and Jeep gets sued. LOL
101 fueling, when you move the right foot fast the TPS tells the ECU , driver is requesting ENRICH mode, (prevents bog) after about a second or 2 , the Enrich mode ends and the MAP (+iAT) is used to govern , fuel mix. The map sees you go up a hill (called load) and adds fuel to the the huge air flow, (o2 sensors are not used accelerating) If all is good, you get full power up hills. this is why i do that test ,
when turn igion half way on all lights come on// then start going off except for check eng lite/ this will stay on and then blink about 12 times stay steady on untll i turn egine onone engine on & runnin it will turn off & stayoff
OK CEL lamp is not dead, ,good the CEL is out driving, this only means no gross errors from sensor. or ECU dont see errors that are real. like fuel pressure, low, ECU cant see that. only a mech can do that. the ECU can not see worn out TPS either. only dead ones.
the CEL is not the only , thing, there is a scan tool, we connect it and watch all sensors. to see if all read correctly. at all trmes. if they do, we check fuel presssure. if fuel pressure is low, the car will bog at WOT. for sure. this is because the ECU can not correct for this lost pressure, it Injects based on legit fuel pressure, lower pressure is lower flow. its that simple, on newer cars this is not true the non run line sensors, and correct.
the now run.
running into town about 20 min away & back plus couple stops if light comes on will stop by local part store they will throw a comp on it , if i still have issue's since i change to no gaping spark plugs will let you know out come
avoid no gap plugs, do not use them. use the spark pulls listed for YOUR car. gapless plugs are UNKNOWN. toss a coin, why do that, what put your self thru hell just for that.?? for sure some no gap plugs worn on the very highest energy spark systems, yours is NOT.
2.4L is 0.050" gap, the 2.4L has a timing belt is is fresh? every 90,000 miles?
those spark wire dont last 11 years. i bet.
low gap is 0.048" is best.
car cam new with Chumpion RE14mcc5 spark plugs.
id use ,NGKs but what type. platinums.
what NGK number....???
that is page 3, in the FSM posted in Ignition chapter, verbatum.
google hit 1> for corss
for cross
NGK LZTR4A11
NGK CAT. look it up, get same and more. see here.
id run NGK spark wires too, the mAG set. blue.
once engine is good, and spark is good, fuel is next, fueling is always last,
now fueling, etc, and bog.
the engine power, if it is lost, can be bogging or misfire. a driver feels this, misfire, is violent. but if spark is good and not misfiring, fuel stavation is Smooth. see? btw ,too rich fueling causes misfire, violent, any mech feels that. and knows what that means.
with a scan tool we can see misfire, by watching for pending P030x codes. see those, they are real, and can go away fast , so a mech runs his tool driving, and up hills, to see if he gets DTC errors under load. this is how to fix cars. guessing is very very hard.
full tuneups are not guessing,, the operaters guide shows what to changes, spark wise and the belt. timing belt, what it its frying and slipped one tooth, that be a huge pain to find huh? (the hard way)
teah is why i stated will be going into shop to be repaired & hopefully not alot of money//// well the road trip turned up one thing the light came back on and seems the power steering sensor which was installed is a bad one / understanding this has nothing to do with my major problem of the hesitation which still is there so off to the shop we go & kill 3 birds with one stone // my hesitation , pwr steer. sensor & inspection! Oh! I am so dam happy!!!!!! Not!!!!!!!
yeah i know what you mean // No she run's smooth but as stated kinda like being held by the back of your shirt by another when you really want to run but cannot your striving to go but there's a force holding you from being let go! as again stated she run's smooth no mis-fire , no- backfire, no bucking , no shaking. nothing!
no since i owned going in for service for that i called already $450,00/ kiti ncluded/ so for maybe under 1,000.00 i should have her back to normal & as far as plug's go yeah i know but thought to treat her to the best instead of low shelfing it as they say you get out of it what you put into it.kinda like a marriage your paying for it no matter what!
to be honest if i have her for another couple yrs before buying a new 6cyl Rubi' W/ all the trimmins I'll be happy & just keep her for my fishing jeep
No , no mech. just learning a bit about my veh. and making sure i am not getting ripped off as have come acrossed many a ripp off repair shop // tell you it's this for 500 when it's that for 50.00 you know what i mean? & no no other comp been on is why i am going to Rep. repair shop
I do appreciate help though you very informitive & thank you
Add a Comment i had feeling was fuel issue maybe not enough air mix with fuel? but def fuel related
its impossible to second guess, car repair shops online, unless you post , what they did, and spending extra on parts, can IN FACT cause you to get the wrong parts, and gapless plugs tops the list, google. Some do work, but why would you do that? its not runing right, why add to the mix, adding non stock parts, (drama?) Ok I didnt realize this post was sounding board post. I only help the hands on person, not others. Any ASE rated shop can fix your car, Im sure. let them. Keep in mind, nobody here can feel your car, so the helper will ask lots of specific questions.. and btw3, the scan tool can see misfire way be for seat of pants can... but if there is no misfire, for sure, (who here can tell that) then it might be fuel starvation. (low fuel pressure) like I said the ECU can not correct for that accelerating.. it can't. The ECU measure air flow, then injects based on that, and injectors not dirty, or fuel pressure low. if the pressure is way low , say 23psi,? then it will under inject. that is a fact. and is always on the techs mind.
get the car serviced, then report.
on and my last point, and good.
car has no stock parts (gapless plugs) and you take it in for service
so he spends 3 hours at 100 /hr. to prove the sparks dont work right,??? why not put in stock spark plugs and then get the car running perfect ,then put in the wrong plugs, then you know, they dont work on THIS car, saving all those wasted hours of labor. just saying...........
why not just do the tuneup, with new spark wires, and stock plugs your self then see... for near nothing compared to labor.
change the wires 1 by 1, do not mix wires.
all was done my friend you must read all my messages plugs done with second to top line plugs which was stated to be for my make & model new wires all thwat around new 02 sensors throttle body was totaly cleaned new air filter new oil change new exhaust new purg valve,, new power steering pressure sensor // dont have all those other fancy comp thats why going into shop
Add a Comment // as for non trustworthy shops i dont just go on line and grab one
Add a Commenti have dealt with one\'s trying to sell me a rebuilt transmission when it was the rearend that was peoblem / i have had one\'s do a tranny seal change & choose to do other work that wasnt ask of them to do which has nothing to do with tranny and charge me for it and needless to say i dont beleive i should have to pay for a psrt if its 50 then pay 50 not 100 i see it all the time so i only deal with one\'s who dont talk out of their just to make a buck b een their done that seen alot co. go down for being dishonest it catches up sooner or later they get caught!! and get a bad name then it\'s bye bye Business as no one wants to go there i think 65 to 75 an hour is reasonable / & have no prob with paying it as they know you will be back time & time again for anyother issue\'s and no dbl/ on parts maybe a pick up chaerge of 15 20 bucks but no way does a Alternater cost almost 200.00 for a jeep unless your up gradeing big a$$ time Sorry i just dont beleive i should have to pay dbl. on parts if their service is really good they shouldnt have to worrie about warrenty and labor after the fact!! why should i pay for their warrenty against their workmenship? dont you agree? ant ways all was done as far as a basic tune up goes as far as i know maybe i may of miss something but nothing else was wrong untill now two weeks ago when this started
Add a Commentwe will find out on Monday thats when she goes in will report what was found & maybe just maybe will help another out with the weird senerio of LOSS OF POWER!!!!!!!!!!!!!!!!!!!!!!!!! AAAAAAAAAAAAAAAAAAAAAAHAHAHAHAHAHAHAHAHAHA LMAO !!!!!!!!! // Heat getting to me !!!!
apples and oranges. new parts are not equal to rebuilt or used, or imported from China, clones or worse knockoff/counterfeit. no i dont agree at all, you need to walk in their shoes,. but going to a stealership and getting charged $25 for $3 NGK plugs, now that is a rip. you are correct, shops do charge double for factory parts. they make money off parts and labor. they do. they will no honor with a warranty , using your parts, why whould they, would you , in their shoes, sure not. if you start fixing your own cars all that ends, you find the parts you buy them , get in trouble with crap parts. and then learn. spark wire put some NGK wire there. id bet 2003 wires are end of road, .... and use real spark plugs. use the ones stated on the NGK page, do so. and WIN. the enigne can not burn fuel if spark is bad, so is first. see? and working scan too free is a total waste time, efforts and parts. a travety really. find a good ASE shop and let them play there craft. they worked hard to earn that badge. most ASE\'s dont need to cheat you , they are gold, they are in high demand , near infinite, so.... why do they need to cheat you, THEY DON\'T.. there are cars lined up for ever behind yours.... good luck.!!!
loss of power is not wierd, after all most old cars are driven until they car is useing 10MPG fuel, or has lost power or both. most cars. and a tuneup fixes most, and a fuel filter if clogged can wreck a good fuel pump.
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SOURCE: Jeep Wrangler Gas Consumption and Loss Of Power
If its using a lot more fuel than usual its almost garaunteed an 02 Sensor. Those are located on the Exhaust Manifold's, are about the size of your thumb, and generally have 2, or 3 wires coming from them. If you can, check them for operation before you replace them as sometimes they're kindof expensive.
SOURCE: 2005 Jeep wrangler w/rough idle and hesitates when you accelerate
try fuel injectors....run a bottle or two with full tank through it and see if that dont solve the problemo.....
SOURCE: 2002 Jeep Grand Cherokee Lardo misfiring
You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.
SOURCE: Describe your 1997 Jeep Wrangler 1997 jeep
The check gauges light is normal because at 400 rpm it isn't running fast enough to build sufficient oil pressure. I am guessing maybe a vaccum leak???
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