Hey guys,

I had some time off and did a few things to my car. I got it fully tuned up with new plugs, wires, cap, rotor, fuel filter, intake, exhaust, sound system, HID lights, and I took some time and repaired the ICU so now everything works and I reflowed the solder on the main relay. Heres what Im dealing with now....

The car starts and runs great when its cold. If i drive it for more than 10 minutes and let it sit for a bit when I try to restart it, itll og really bad, and I have to bury the gas pedal to keep it from stalling. Itll run like crap and keep chugging until eventually overcoming whatever is causing it, and then itll idle up. It still does the surging idle thing, but Im dealing with stuff one problem at a time. By the way, its a 91 DA with a B18A non vtec, and when it has this idling problem is doesnt turn the check engine light on, and there are no codes to pull when I check it.

Its my daily driver, and id really like to get the bugs worked out so I can finally start enjoying it.
I have spares of pretty much all the sensors, and I have even tried swaping them out one by one to see if thatdd fix it, but to no avail.

Anyone have any ideas?

heres the link to the video I took.

http://youtu.be/9avOEEFNkYo

 

was it doing that before you did all the work to it?
when you check the codes, you're checking at the led on the ecu, yes?
have you checked for vac leaks?
what all were the sensors you tried replacing to cancel out the problem?

 

I tried swapping out a different IAC that I had, and now the chugging stopped but it has the bouncing idle. I cleaned the IAC really well before I installed it, and made sure that it wasnt plugged up on the coolant side. Once installed I made sure that the IAC got good coolant flow to it when the car was started, but its still acting up. I checked the ECU and I still dont have any codes when I jump out the connector. I did remove the intake pipe and make sure that once the car was warmed up that there wasnt air being sucked through the passage that goes to the FITV. I unplugged the IAC and set the idle with the screw, and reset the ECU but its still doing the bouncing idle. The weird thing is that when I unplug the IAC the idle stabilizes. I dont want to run the car without the IAC because im worried itll stall if I turn on the A/C or come off the gas suddenly while on the freeway.

Anyone have any ideas?

The car has been doing this since day one. I checked all the vacuum lines and they are intact. I have a spare IAC, FITV, ICU, and Intake temp sensor. Im starting to suspect the TPS.

 

try checking ignition timing.
also, you don't have to jump the connector to check codes. the code will flash anytime the ignition is turned to run. try checking without jumping it

 

i have tried to set the timing, but once the timing is set the car is really boggy and has only top end, which from my understanding means that its retarded. The only way that I can get it to run halfway descent is to have it the distributor all the way counter-clockwise which is advanced if I remember correctly. When I set the timing I heated the car up, jumpered the connector and got the timing light and set it. Its kind of hard to see the marks because when I got the car it didnt have the lower timing cover on it, and I havent been able to find one since, so I am going off the mark on the oil pump for top dead center.

one more thing, when I set the timing does the connector have to be jumpered out? because I could try it without it.

 

so how are you able to set the timing with a light without having the lower cover on?
and yes, jump the service connector to set timing. that's the correct procedure.
so with the iac disconnected, the loping idle stops? if so, it's probably not a vac leak.

first thing you have to do is have timing set at roughly 16*btdc. after that, you can carry on diagnosing. but that must be met first

 

If your having problems setting ign. timing, check and confirm valve timing is correct. 94

 

I use the mark on the oil pump as the top dead center mark.
and the lopey idle goes away when I disconnect the IAC

 

hmmm. i think you need to get the lower cover and set timing as per procedure.
with the iac disconnected, the ecu is probably running timing as it sees fit. which would mean your timing is set incorrectly
just a possibility