Uknown Srews

There are two adjust srcews in the intake maifold on the left side just beside the ilet of the house that bypass the throtle. Wich one is doing what??? I mean the screws.Some mecanichs turned the to meke the engine run after it has be put all together. Now the engine is working quite nice on idle and with out load. But when I want to drive magical things are hapening. the ingine starsts to choke, Works very rough, no power and sometimes it works like there were no fuel I mean no ignition on some cylinders. HELP!!!!!!!
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ChEsTeR icon_biggrin.gif
Silvia 88 CA18ETi Nissan
http://members.cardomain.com/chester_000

Hey Chester!
If I understand correctly about the 2 screws they do nothing icon_biggrin.gif well not on later models anyway. Both of them are for the idle speed, one for the engine and the second one if you have AC on.
On the later model we have the idle screw above the radiator and turning those two screws don't do a shit on our car.Atleast not in mine.

The second problem can be because of the ignition coils. One of them shuts off during boost. If only that one works you won't be able to drive the car with boost. It starts shaking verry violent and also the RPM meter will flip back and forth. Try to drive the car verry carefull and with verry little acceleration. Try to keep it from boosting and you should be able to drive it.
Another problem if you can't get over 2000RPM I think it was, is the MAF. If it's disconnected or if it's bad the car will only run to 2000RPM max.

Hope this helps!
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S12 ca18et -88
280zx L28 -82 (owned for 3 years but never driven it)

On idle I can get over 6000 rmp. I think I have found the problem. the car was standing on a prking lot for almost 5 mounths a I think its the water that got int to the fuel tank. I have already pourd some alckochol in it to grt the water out. Maybe this will do. And about the coils I have a europen version I have only one coil.
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ChEsTeR icon_biggrin.gif
Silvia 88 CA18ETi Nissan
http://members.cardomain.com/chester_000

if it's the screw that i think it is, it's probably causing your stumbling. i had the same problem until i turned down the screw. just mark where the screw position is now and give it a turn ccw and see if it helps.

Some mechnicks played with those screws and there is no way I can mark the original position. But I'll tyr to tune them up.
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ChEsTeR icon_biggrin.gif
Silvia 88 CA18ETi Nissan
http://members.cardomain.com/chester_000

Is there a posibilyty to set up an air fuel ratio with crowe tat are in the intake maifold.
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ChEsTeR icon_biggrin.gif
Silvia 88 CA18ETi Nissan
http://members.cardomain.com/chester_000