Have a 90 iroc z with 350 tpi and does anyone know what a good timing degree to set engine to? Also jst bought car with no history bout it so ? Is it has an after market cold air and it does not have a mass air flow sensor! I ddnt no u could do that witout an mas"so anyone know what smeone could have done to it?thks

 

If has a mass air sensor then it is not a 1990. It is an 89 or older.

 

Car is a 90 but not sure bout motor"I no it does not have an mass air flow sensor nowheres lol"any other clues to indentfy its an 89 motor?

 

A '90 is a speed density system, uses a MAP sensor.

Base timing is 6* BTDC, disconnect the EST/BYPASS connector and set the timing with the engine up to temperature.

RBob.

 

Can bump that up to 8-10 deg base timing and you should see a mild performance improvement around peak torque rpm. Give it premium gas tho.

 

Thks a lot"ill try that today

 

Had timing ajusted"but feels like throttle is not as quick as b4!slugish feeling on take off but smoothes out bout 2000. Rpms! Any ideas?

 

I'm a complete noob when it comes to setting timing and what not. But I have checked it and it is at 6* BTDC. I've got k&n air filters, dual-cat(less) y pipe, magnaflow 3" catback with a qtp cutout..

Would I benefit from setting the timing any higher? I already run 91 octane all the time (best we got at CA pumps).

 

Did you disconnect the EST wire first before setting the timing? It's a single tan wire on the passenger side sticking out of the big wire harness near the A/C Canister.
[IMG][/IMG]
[IMG][/IMG]

 

From wat I hear yes "disconnect that wire b4 setting timing and once timing is set"cutt car off rehook wire n then disconnect battery for a few min"so computer can reset

 

So what did you set the timing on?

 

Be aware, if you set the base timing above 6* you are changing the entire spark table by that much. The base timing and the base setting in the programming should be the same - 6* BTDC.