my rpm jumps from 1000 to 1500 and back down to 1000, it repeats this when i

put it in park after the car is warm. anyone knows what this problem could be?

my car:

honda 93 del sol s auto, no mods

heres what happened:

i was on a trip for a month and had the car parked and sitting. everything was

working fine, when i got back the battery was drained from my alarm. so i

charged it and it ran fine for that day. the next day after i warmed it drove it then

put it in parked it then the rpm started jumping. so i couldnt fix it til the end of the

week. i drove it lightly for about 3 days, 3rd afterwork my battery didnt charge. so

that next day i was off, i got a new alternator, new battery, did all that i listed

below.


what i did: (this was after the trip, the following weekend)

new alternator, new battery, cleaned iacv, checked fitv, adjusted throttle, changed oil (seafoam), oil and air filter

question: is there a sensor that could have gone bad? ive searched this forum but

no success, any keyword that i could use? what does the map sensor do, it be

that?

 

this happened to me right before the fuel pump crapped out.

 

thanks for the quick reply, any other suggestions?

 

ttt

 

could possibly be your o2 sensor, my rpms were goin everywhere and i changed my sensor and it fixed it

 

thanks, is there a way to check the o2 sensor

so i have to open the gas tank cover to release pressure if im goin to change the fuel pump

bump for quick response

 

not sure if theres anyway to do a test on it but its on the exhaust manifold. i heard you cant repair an o2 sensor so if you'll have to replace it. it wasn't too expensive

 

i c, i know where it is. i guess ill be changing the o2 sensor than. fuel pump is 13 years old i may as well change that too. thanks for the help

 

Check your grounds too

 

checked grounds, just waiting til tomorrow to change out the o2 sensor.

why would the rpm jump up and down like that, only when i only put it in park after its warm?