I hate starting threads but...

 

4age bigport 16v from an AE82

 

No O2 sensor

 

When I start it, it will catch, chugalug, cough, sound sick so I turn it off.

 

Wait a bit, (2-3 seconds) turn it back on.

 

Start, and it will either do the same thing( go to line 3) or fire really good.

 

So annoying.

 

Ideas?

 

EDIT: Should mention he 'said' he got a new ECU and MAP sensor?

Edited January 7, 201214 yr by B.L.Z.BUB

Missing a cyl when it first starts up?? That sort of chugging?

 

Electrics not firing a plug or an injector?

 

Does it runs really smoothly when it starts well, so idles straight away on the cold start system?

does it have a cold start injector?

Early bigport will go fine with no o2 sensor or cold start injector.

 

Have you tried doing a diag on it to see if any codes come up?

 

Hard to say without looking at it but I would say electrical.

CSIs are only used during cranking though, right? So as soon as the engine catches and you let go of the key it is no longer part of the equation. Unless it isn't stopping and is flooding the engine making it run rich and rough.

CSIs are only used during cranking though, right? So as soon as the engine catches and you let go of the key it is no longer part of the equation. Unless it isn't stopping and is flooding the engine making it run rich and rough.

 

Only just seen this thread again, yes that is correct, it gives it a pulse when you hit the key.

 

Any news Reed?