If i hold my my rpm at 2000-2500/rpm, is going up and down and the car seems to miss some power...if i push up the gaz it take it well but still that i have a problem with the rpm that goes up and down....could it be a coil?or only sparks plugs?seems that i have a missfire somewhere...could it be the air intake i know that he've been changed since a cpl of month...thx for your help Rick
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RPM at 800 , in drive
can you race motor in neutral, to 2500 rpm
1: does rpm rise above 1500 in drive and no movement, (slip and bad tranny)
2: or holds about 1500 but can move. (brakes frozen , with ice)
try to push car in neutral on flat ground, can you>
no , the brakes are iced.
yes, then engine power is bad.
with A/T trans, you get to first find out.
1: is engine weak.
2: is tranny slipping (races to very high rpm and no go)
3: or brakes ices, (post location so we can see climate, duh?
your throttle body sensor may be bad. first get a can of spray carb or fuel injection cleaner and spray it in the opening for the intake for the throttle body. this will clear out the carbon build-up. when you crank it it will run shaky but shoiuld clear up within a minute
Auto. Transmition when giving trouble will not change up until R.P.M. has gone over 2500 rpm. Should should change up between 2000 and 2500. When changing it down (pushing accelerator to the floor) it should do this imedietly. Isuzu Troopers have a power button on the console between the front seat's this is for trailer pulling and when it is on.(power light on in Dashboard) then it takes more R.P.M. to change up allowing for trailer weight.
I am having the same issue after I changed my battery today. Upon doing some research it seems like there is some way of aiding the computer with proper idling. I haven't done it yet... plan on going to the dealership where I got the battery, but from my understanding you disconnect the negative line from the battery for a few mins, reconnect, and then apply gas at 3000 rpm for a few mins until the fan kicks on. AND this will help reset your car to proper idling. Good luck
if it isnt the iac probably the pcv valve positive crankcase vent. it is on a vacuum line somewere under hood. or check the air cleaner, the hose with the small filter underneath the air filter. i take its fuel injected?
when you clean it make sure that you hold the butterfly open so you can get the spots clean that need it. If there is anything in the way the butterfly will not close. Just a small bit of dirt will do this .
Could be a short in the wiring for the O2 sensor. I currently have the same issue only my car finally threw a code after two days of it acting up. Code 106. Changed the MAP sensor and it now throws 108, MAP sensor high voltage circuit. Ah the joys of cold weather and broke down vehicles. But I know that you wont always get a code with a short. Let me know if you fixed the problem.