Hey guys looking for some help I bought a 94 del sol with a 97 (obd2) b18b1, it was running a obd2 harness pulgged in a obd1 sub harness ( the one in the car) with was plugged into a obd1 PR4 ecu, motor ran strong but during start up it would rev up and down between 500ish - 3500 rpm for like 5 mins until it warmed up then it would be fine, stay at a normal idle. I have tryed cleaning adjusting replacing the IACV and FICV. No luck....

I had gave up and decided to so a swap, I went with a 94 b18c1, with p72 ECU reused my harnesses ( used my obd2 injectors ) changed the plug for the evap, got a sub harness for rywire for the new vtec plugs and KS and IAB, the problem is still there??????? This is with new IACV and FICV new map, all sensors were changed....... I'm banging my head agains a wall trying to figure this out without changing every part?

Everything I read is about a idle jumping a few hundred rpm.... This is not my case it's literally like from normal idle 900ish to 3500-4000 like a kid just sitting there and pumping the throttle???? I'm so lost and frustrated right now and just looking for some help!!!!

 

Cels?

 

No check engin lights, it turns on when I turn the key forward so I know it's not burnt out or any thing but I have never plugged a diagnostic tool into it ( due to no CEL coming on

 

Is there anyone in the Torrance CA area have a OBD1 diagnostic tool willing to make a house call?

 

Anyone in the Torrance CA area with a diagnostic tool willing to make a house call?

 

Jump the service connector and see if you have any pending codes

 

I'm going to need to get a code reader before I can do this, I need to wait till Wednesday for my shift linkage to arrive to take it to a garage. Would that make since seeing how it was 2 diffrent ECUs, well I guess ya it would seeing how it's had the same wiring harness maybe a short in the harness?

Once again anyone got an Honda OBD1 diagnostics reader? In or around Torrance CA? That could help a guy out with a reading?

 

There's not a diagnostic port on obd1 Hondas. You need to jump the service connector with a paperclip

 

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/how-pull-cel-d4-srs-abs-codes-code-lists-1901557/

 

Ok ya the small blue clip? As you can tell I'm new to the Honda world, if I do the paper clip trick what should I be looking for what will it do?

 

Read the link I posted. Its very simple

 

Like if I currently don't have a CEL, this may still show a code?

 

Yes

 

That's a great link thanks but like I had mentioned can this work if I never had a CEL? You said it could be stored?

 

Yes but more then likely there's not a pending code, its just something you can check. Might have something to do with your obd0 tb

 

Obd0 TB? Don't have one, this issue has happened with 2 diffrent motors, one with an obd1 and the other with an obd2

 

Srry I thought you mentioned that, that was from a diff thread

 

No worries man going to try jump the connectors tomorrow, wish me luck I will post any findings or if it's back to the drawing board

 

So I tried to jump the connector nothing?????

 

Any other ideas

 

IACV try cleaning it if that doesnt work then you'll need a new one. thats whats known as the honda idle and about 99.9% of the time is caused by your iacv

 

Yah I have adjusted it cleaned it and used 2 diffrent ones and no luck

 

Having the same problem here, only.difference is my car is on a s300. During cold startup will.go up to.2000rpms then down to 500. When hot works fine. It was working fine before, will be trying to change the idle speed control and.see what happens.

 

Could have something to do with your harness something may not be wired properly. Why not just run an obd1 vtec harness? Would make more sense since your using all obd1 stuff now

 

fast idle valve has backed out