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Low Idle/ Other Issues

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Old May 18, 2020 | 02:23 PM
  #1  
Kyle Knight's Avatar
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Joined: Oct 2016
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From: Missouri
Post Need Help!

Hey Guys,

So the other day we pulled my intake manifold to change my rear motor mount on my 92 prelude. It has the H22A swap in it. I accidently moved the adjustment nuts to remove the throttle cable (Rookie move I know) and pulled the whole intake manifold. After we got done reinstalling the manifold, we went to reconnect everything and adjust the throttle. Everything seemed fine except for the throttle being a bit more touchy than normal which I figured was from the adjustment. Anyways the next day the car started to Idle really low (around 400 RPMs) constantly and would die when ever it was sitting still. It was still pretty drivable as long as I didn't let the RPMs drop too low. Everything was fine but then while driving I suddenly lost throttle response and it started dying but was still running. I can hold the clutch down and throttle up and it works fine but the moment it starts moving it will move about 30 feet before I lose the throttle response totally. This all only happens after the car has warmed up to normal temp. Before that the car runs fine. So what could be causing this issue and the low idle? Everything worked fine before we pulled the manifold. I also put an MSD Cap and rotor on there as well since my stock one was kinda shot. Any kind of help would be greatly appreciated. The car is partially drivable right now.

Last edited by Kyle Knight; May 18, 2020 at 03:25 PM.
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Old May 18, 2020 | 08:08 PM
  #2  
TimiK's Avatar
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Joined: Sep 2012
Posts: 717
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From: Kuopio, Finland
Default Re: Low Idle/ Other Issues

Originally Posted by TimiK
quick what to do list

usually these things fix bad idle or/and hesitations:

- new spark plugs & wires
- new distributor cap & rotor
- new air/fuel filters
- clean injectors/iacv/egr/fitv
- bleed the coolant
- new pcv
- adjust valves and ignition
- adjust idle from tb's screw and throttle cable
- check does sensors work properly: map, iat and tps (and try calibrating tps)
- then check wires, connectors and hoses, check grounds
- check ICM and ignition switch (there was 5th gen repair call for this also)

-check o2 sensors and vacuum/exhaust leaks (check all the seals - IM/header/TB gaskets, injector seals, maybe even buy valve cover gasket set...)
-check timing. after that: double check timing
-is engine light on? check error/engine light codes
-clogged cat might you give some trouble as well (usually when driving) - check cats condition

if none of these seem to work - do compression and leak tests
and if you have chipped ecu and youre running it just with basemap, it might not work as well than properly tuned one

those are basic maintenance as well.
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