built2envy

i have an 87 lx with a buit fuel injected 302 it got a mild cam, trick flow upper and lower intake,75mm throttle body and mass air, msd dist.,under drive pulleys, ported heads, bbk headers, off road h pipe and flow master mufflers. every time i start it off a mourning or when its set long enough to cool off, and i go to start it i have to hold the throttle at about 2500 rpms for atleast 5 min. before it will idle by its self does n e 1 have an idea what it could be and how to fix it. thanx in advance for any help.

shane

cassimus

mine has the problem of when i crank it up every now and then it will keep the rpms up past 2 and it just sticks there and the only way to drop it is but reving it a couple of times.....but sorry im no help to your problem

mattdel

built2envy: get a new idle air control motor
cassimus: thats just by chance, injected motors dont respond to throttle snaps like a carbed motor

svt99redcobra

Yea replace both the tps (throttle posistioning sensor) and the IAC ( idle air control valve) and you should be fine. You can pick both up for about 80 bucks

PRO50SC

Why replace a tps if it's not the problem. Throwing parts at cars as hope in fixing them is both a waste of time and money. Propperly diagnose the problem and fix it correctly. Will end up saving time and money in the long run

cassimus

well the only way i have found out how to get it to drop back down is snapping the throttle b/c if i dont it will stay that way for awhile but it only does it everynow and then and mainly when its super cold around 30 which in ga is horribly cold ha

svt99redcobra

pro5.0 i was just saying that because i had the same exact problem in my car, and i changed them both and it was fine.

mattdel

if the TPS was at fault, it wouldn't correct by warming up. IAC will.

vt89gtvert

How about just making sure they are adjusted correctly before throwing them away. Only take like 5 mins to do the TPS (With an extra set of hands to hold the meter probe), and it fixed the same problem when I had it. Pro is right. Find out what the actual problem is before just throwing money at it.

PRO50SC

did you change them at the same time?