1990heepxj
NAXJA Forum User
- Location
- Apple Valley, Ca
so i been drivin it like this a while now and it bugs me but doesnt really hurt anything. 1990 4.0 aw4 242 yada yada.....
anyway when im in say a drive thru i notice my idle sit at normal 700-750ish but it every 10-20 secs or so kinda drops idle to somewhere in the 500 range and is a little rough for a couple secs then goes back to normal. sitting there it just keeps repeating this process and is wrather annoying. the other thing it sometimes does is every once in a while, not always, when i go from goin fast to stoping at a stop light/sign the idle is at around 500 and rough also for a few secs and slowly picks back up to normal also. if i hit the gas in park/nuetral it goes back up rpm no problem but kinda goes back to low idle for a sec then normal when i let off the gas. in drive when it does the low idle thing i get a very small almost unnoticable sputter when i hit the gas, only if its doing the low idle at the time. other then that it runs great, no hesitation or sputter when i accelerate on normal occasion.
im not really sure what this would be, my iac, tb, and tps are all clean and adjusted correctly. not possitive my iac is working perfectly, but can check it tomorrow if that sounds like the likely cause
anyway when im in say a drive thru i notice my idle sit at normal 700-750ish but it every 10-20 secs or so kinda drops idle to somewhere in the 500 range and is a little rough for a couple secs then goes back to normal. sitting there it just keeps repeating this process and is wrather annoying. the other thing it sometimes does is every once in a while, not always, when i go from goin fast to stoping at a stop light/sign the idle is at around 500 and rough also for a few secs and slowly picks back up to normal also. if i hit the gas in park/nuetral it goes back up rpm no problem but kinda goes back to low idle for a sec then normal when i let off the gas. in drive when it does the low idle thing i get a very small almost unnoticable sputter when i hit the gas, only if its doing the low idle at the time. other then that it runs great, no hesitation or sputter when i accelerate on normal occasion.
im not really sure what this would be, my iac, tb, and tps are all clean and adjusted correctly. not possitive my iac is working perfectly, but can check it tomorrow if that sounds like the likely cause